美国市民农园生态植被景观营建及其启示

美国市民农园是一个值得借鉴的兼具生产、生态和生活等多功能的植被景观模式,本研究针对市民农园的生态服务功能,依据市民农园结构模式及经营群体的不同,随机选取了洛杉矶市14个市民农园,采用样地调查、半结构式访谈等方法,基于植被物种功能组合和乡土植物组成,定量化研究了城市植被物种多样性及其分布格局对种植者族裔背景及营建模式等影响因素的响应,进而评析对我国城市绿地建设和休闲农业的启示。本研究共计调查到439种植物,分属90科,242属,分析结果显示:市民农园是城市生态系统中重要的物种库,能维护较为丰富的乡土植物资源;其植物功能以食用植物为主,观赏植物、药用植物次之,这在保护族裔传统文化、区域乡土文化具有重要价值;其植被景观结构和功能受到族裔背景及营建模式等不同程度影响。研究证明,市民农园作为生态多样性和文化多样性的交汇景观,是实现城镇绿色基础建设和休闲农业发展的重要营建模式。以此为经验,我国在进行绿地规划和生态植被建设时要考虑不同利益相关者,尤其是关注外来者的生活习俗和选择偏好;同时也要注意监测外来物种,以防造成物种入侵,这对于建设文化强国背景下开展城镇生态植被建设和发展休闲农业具有启示意义。     

Urban domestic gardens (IX): Composition and richness of the vascular plant flora, and implications for native biodiversity

Garden floras interact with native biodiversity by providing resources for wildlife and by acting as a source of non-native species. Understanding the composition and richness of garden floras will help evaluate the relationships between these floras and the wider environment. The composition and richness of vascular plant floras were measured in a stratified sample of 61 urban, domestic gardens in Sheffield, UK, based on complete garden inventories. The entire garden flora contained 1166 species, of which 30% were native and 70% alien. Across gardens, aliens showed lower occupancy than natives, comprising 79% of the species recorded only once. The garden flora contained 146 plant families, which included 72% of the native, naturalised or recurrent casual families recorded in the wild in Britain and Ireland. Gardens contained on average 45% natives, irrespective of garden size. Garden area explained 30% of the variation in species richness within individual gardens. Doubling garden size led to an increase in species richness of 25%. The garden flora comprised 10% annuals, 63% biennial/perennials, 18% shrubs and 8% trees; shrubs were disproportionately composed of alien species. The floras of urban domestic gardens probably form the greatest source of potentially invasive alien plants. However, the plants found in domestic gardens have closer affinities with the uncultivated flora than is often perceived, and their role for wildlife in gardens deserves reassessment. Declines in garden size that result from recommendations on the density of new housing are unlikely to have major consequences for plant richness in gardens.     

Urban domestic gardens (XIII): Composition of the bryophyte and lichen floras, and determinants of species richness

Private, residential gardens form a substantial proportion of the undeveloped land in urban areas. Evaluating their role in supporting biodiversity is crucial to (i) predicting which plant and animal species can persist in towns and cities, (ii) understanding the regional impacts of urbanisation, and (iii) guiding sympathetic garden management by owners. To obtain baseline information on a poorly-studied component of garden biodiversity, we measured the size and composition of the cryptogam assemblages in 61 domestic gardens in the city of Sheffield, UK. A total of 67 bryophyte and 77 lichen taxa were recorded. Bryophytes ranged from 3 to 24 species per garden, with a mean richness of 11.3 species; lichens ranged from 2 to 30, with a mean of 14.9 species. Stone substrates supported the highest lichen richness, although minor substrates contributed unique species. Just over one fifth of bryophyte species were recorded in grass lawns, and these were more widespread than those of other habitats. Most cryptogams were scarce, with around one quarter of both bryophytes and lichens occurring in single gardens, and only 10% were found in more than half of the gardens. Garden area - correlated with substrate richness - and garden altitude were the only two factors explaining variation in cryptogam richness (bryophytes 39.1%, lichens 32.4%). Positive correlations existed among bryophyte, lichen and vascular plant richness, and these were only partially mediated by the effect of garden area. Therefore the opportunity remains for garden owners to support cryptogam richness, the most effective action being to enhance substrate diversity.     

Does variation in garden characteristics influence the conservation of birds in suburbia?

Can enhancement of garden habitat for native birds have conservation benefits, or are garden bird assemblages determined by landscape and environmental characteristics? The relative roles of vegetation structure, floristics and other garden attributes, and environmental and landscape controls, on the abundance and richness of bird species in 214 back or front gardens in 10 suburbs of Hobart, Tasmania, Australia, are addressed to answer this question. Birds were counted in each garden and the resources they utilized noted. Vascular plant species and other attributes of the garden were noted, along with rainfall, altitude, distance from natural vegetation, distance from the city and garden size. Garden floristics and bird assemblages were ordinated, and garden groups characterized by particular assemblages of birds identified. General linear modelling was used to determine the combinations of independent variables that best predicted the richness of birds and the abundance of individual bird species and groups of species. The models for bird richness, bird species and groups of bird species were highly individualistic. Although native birds showed a preference for native plants, they also utilized many exotic plants. Exotic birds largely utilized exotic plants. Variation in garden characteristics does substantially affect the nature of garden bird assemblages in Hobart, with weaker environmental and landscape influences. The fact that gardens can be designed and managed to favour particular species and species assemblages gives gardeners a potentially substantial role in the conservation of urban native avifauna.     

The enset (<Emphasis Type="Italic">Ensete ventricosum</Emphasis>) gardens of Sidama: composition,structure and dynamics of a traditional poly-variety system

The composition and structure of 300 enset gardens from 10 different locations in Sidama were examined. Average size of the gardens was 0.74 ha. The gardens are composed of mixtures of various named enset varieties and different groups recognisable on the basis of ‘sex’ (male and female) and use (cooking and processing). The gardens exhibit high diversity, with a given garden containing up to 24 varieties (mean = 8.2). However, the components are not represented equally. Typically, the gardens consisted of one or two very abundant varieties and a much larger number of less common ones. Enset gardens are dynamic because the number and composition of varieties and different types changed from garden to garden, from location to location and across time. Their composition, structure and dynamics have been influenced by human, socio-economic factors (farm size, land per capita, cropping patterns and size of livestock), temporal circumstances and landscape elements (elevation) in which they are found. The nature, characteristics, organization and functions of Sidama enset gardens are outlined and the importance of maintaining mixtures of varieties for farmers is discussed.     

Home gardens: an assessment of their biodiversity and potential contribution to conservation of threatened species and crop wild relatives in Benin

Despite growing literature supporting the importance of home gardens (HG) as biodiversity hotspots, knowledge of patterns of their contribution to conservation of threatened species and crop wild relatives (CWR) across climate and culture in Africa is still limited. This investigation was conducted across three climatic zones to assess the floristic diversity of home gardens and the extent to which they contribute to conservation of threatened species and CWR. Overall, 240 home gardens were sampled and their floristic diversity assessed. The ecological importance of recorded species was determined per climatic zone using the importance value index (IVI). A cluster analysis was performed to group the species according to their IVI-values and a principal component analysis helped to identify the most important species. 285 species were inventoried throughout the study area. Home garden species’ diversity globally declined from the drier to the wetter zone but was highest in the transition zone. The average number of species found per HG was 10.1 and varied weakly across zones (9.07, Guineo-Congolean zone; 10.77, Sudano-Guinean zone; and 10.53, Sudanian zone). The most important home gardens species in the Sudanian, the Sudano-Guinean and the Guineo-Congolean zones were respectively: Abelmoschus esculentus (L.) Moench and Hibiscus asper Hook.f.; Solanum lycopersicum L. and Zea mays L.; Ipomoea aquatica Forssk. and Senna occidentalis (L.) Link. They were mainly vegetables and used as food and/or medicinal plant species. Twenty CWR and twelve threatened species were recorded and were also mainly used for food and medicinal purposes. Thorough research on socioeconomic factors supporting possession of HG and choice of managed species as well as indigenous management strategies of HG and dynamic of traditional knowledge related to HG may help to deeply assess home gardens’ effectiveness in biodiversity conservation.     

Gardens benefit bees and enhance pollination in intensively managed farmland

The recent loss of pollinating insects and out-crossing plants in agricultural landscapes has raised concern for the maintenance of ecosystem services. Wild bees have been shown to benefit from garden habitats in urban and suburban areas. We investigated the effects of distance from garden habitats on wild bees and seed set of a native out-crossing plant Campanula persicifolia, in intensively managed agricultural landscapes in Southern Sweden. Bee abundance and species richness, as well as plant seed set, were higher closer to gardens (<15 m) than further away (>140 m). This highlights private gardens as a landscape wide resource for pollinators but also the lack of sufficient pollination of wild plants in contemporary agricultural landscapes.     

Changes in soil chemistry associated with the establishment of forest gardens on eroded,acidified grassland soils in Sri Lanka

Topsoil properties were determined in forest gardens established about 20 years ago on eroded grassland soils (abandoned tea lands) in the wet zone of the Sri Lankan highlands. They were compared with adjacent, eroded grasslands (abandoned tea lands) on strongly weathered soils vs soils at earlier stages of pedogenic development in a two-way analysis of variance. Soil pH in forest gardens was, on average, 6.1, nearly one unit higher than in the adjacent grasslands. In the garden soils, the cation exchange capacity (CEC measured at pH 4.8) was nearly double, exchangeable calcium concentrations five times and exchangeable magnesium three times as high as in the grasslands soils. Total soil N content was found to be nearly 40% higher in the gardens. Topsoil gravel contents in the gardens were less than half as high as in the grasslands. The increases in exchangeable bases and N in gardens, relative to grasslands, were attributed to increased nutrient retention and acquisition. Higher retention was partly due to the higher CEC_pH4.8, and probably to reduced erosion and increased, continuous fine root density in the garden topsoils. Higher field CEC in gardens was likely to result from generally higher C contents and from the reversal of acidification, presumably caused by base accumulation and decomposition processes. Our results suggest that forest garden establishment on degraded grasslands can lead to accumulation of mobile nutrients in the topsoil, probably due to increased nutrient retention, subsoil uptake and litter input exceeding nutrient uptake by the standing biomass.     

Consequences of ex situ cultivation of plants: Genetic diversity, fitness and adaptation of the monocarpic Cynoglossum officinale L. in botanic gardens

Ex situ collections in botanic gardens have great potential in contributing to the conservation of rare plants. However, little is known about the effects of cultivation on the genetic diversity and fitness of garden populations, about genetic changes due to unconscious selection and potential adaptation to the artificial conditions. We compared the genetic variability and fitness of the rare, short-lived perennial Cynoglossum officinale from 12 botanic gardens and five natural populations in Germany. Genetic variability was assessed with eight nuclear microsatellites. Plants were grown in a common garden and performance was measured over 2 years. Mean genetic diversity was very similar in botanic garden and natural populations. However, four of the garden populations exhibited no genetic variability at all. Moreover, the genetic diversity of garden populations decreased with increasing duration of cultivation, indicating genetic drift. Plant performance from natural and garden populations in terms of growth, flowering and seed production was similar and in garden populations only seed mass was strongly related to genetic diversity. Several lines of evidence indicated genetic changes in garden populations in response to cultivation. Seed dormancy was strongly reduced in garden populations, and in response to nutrient addition garden plants increased the size of their main inflorescence, while wild plants increased the number of inflorescences. These changes could be maladaptive in nature and reduce the suitability of garden populations as a source for reintroductions. We suggest that botanic gardens should pay more attention to the problem of potential genetic changes in their plant collections.     

Menara gardens: a Moroccan olive germplasm collection identified by a SSR locus-based genetic study

The Menara gardens in Marrakech (Morocco), established in the 12th century, comprise more than 2000 olive trees. To assess the genetic diversity within these gardens, we performed SSR analysis of 128 randomly sampled olive trees. Using 15 SSR loci which revealed 70 alleles, we identified 16 distinct genotypes. The analysis of chloroplast DNA polymorphism allowed to identify 2 chlorotypes: COM1 for 2 genotypes and CE1 for all others. Among the 128 trees analysed, Picholine marocaine was the prevalent cultivar represented by 100 trees (78%), the 28 remaining trees being classified into 15 distinct genotypes. However, four genotypes were closely related to Picholine marocaine from which they probably derived through somatic mutations. The genotypic and genetic diversity observed in Menara gardens compared with the genotype diversity from different areas (North and Atlas); these facts support the hypothesis that these gardens have been planted with trees probably originating from different areas of Morocco. Our results point out an important concept for ex situ conservation: the assumption that local Moroccan olive germplasm was empirically, but not purposively, conserved already in Menara gardens.     

Ethnobotanical knowledge and agrobiodiversity in subsistence farming: case study of home gardens in Phong My commune, central Vietnam

Ethnobotanical survey was conducted in 101 randomly selected home gardens of Phong My commune, central Vietnam, situated in the buffer-zone of Natural Reserve. Data were collected through semi-structured questionnaires and direct observation. Sixty-seven species belonging to 35 families were identified to be used for various purposes. For each species the botanical and vernacular names, plant parts used and main purposes of use are given. The major use categories reported for plant species were food (86%), medicine (32%) and firewood (32%), however, seventy-seven percent of all inventoried plants have multiple uses. The species Artocarpus heterophyllus Lam., Citrus grandis Osbeck, Citrus reticulata Blanco, Ipomoea batatas (L.) Lam. and Musa spp. were identified as the main sources of plant foods consumed within the households. Statistical analyses indicated by Shannon-Wiener and Margalef indices have shown that local species diversity and richness is affected by home garden size. On the contrary, no relationship between diversity and home garden age was found. On the basis of a cluster analysis of plant species diversity, five home garden types were differentiated. In comparison to previously reported studies on tropical home gardens, the diversity in Phong My is lower, probably due to market-oriented strategy. Nevertheless, based on the results achieved, we can conclude that useful plants cultivated in local home gardens provide valuable foods complementing daily diet and subsequently contributing to socioeconomic status of the households.     

旱地红壤线虫群落对不同耕作年限的响应及指示意义

我国热带和亚热带地区的红壤农田肥力水平低,严重制约着农业生产力的提升。不同农业管理措施会对土壤理化性质和生物群落产生不同的影响。本文研究了不同耕作年限条件下的旱地土壤,选取耕作10 a、20 a、50 a的花生地和菜地,并以未开垦的原始荒地作为对照。结果显示,与荒地相比,各年限花生地的土壤肥力等指标表现出下降的趋势,菜地土壤的各项性质则呈现提升的趋势。耕作20 a的花生地土壤有机碳、全氮、微生物生物量碳、有效磷等指标均最低,同时耕作50 a的菜地各项性质相对于10 a有显著的提升(p0.05)。花生地中植食性线虫比例伴随耕作年限延长而下降,而菜地中食细菌线虫比例伴随耕作年限延长而逐渐上升。从线虫生态指标数据显示,花生地相对于频繁施肥和耕作的菜地表现出更为稳定的土壤食物网。因此,线虫群落对不同耕作年限下旱地红壤生态系统的变化表现出一定的指示潜力。     

中国寺庙园林景观初探

对中国寺庙园林的起源、概念等作阐述,并根据实地调查,结合相关文献资料,对寺庙园林的特点进行归纳分析,认为寺庙园林具有宗教性、人文性、景观性和自然性4个特点。探讨了寺庙园林与自然之间的多重关系。     

云南省白族农户生态庭园模式研究

阐述了云南省大理白族自治州喜洲镇白族农户生态庭园的6种模式类型，即普通型、集约养殖型、劳务输出型、庭园车间型、水面开发型和服务经营型，并在研究模式结构基础上简析了庭园经营与大田生产的关系和白族庭园的特殊性，提出了进一步建设农户生态庭园的若干建议。     

茶园土壤微生物量碳的质量分数及其影响因素的研究

对148个茶园土壤的微生物量碳(MBC)质量分数及其影响因素进行了研究。结果表明,茶园土壤MBC的质量分数(ωmic)在38.1~680.2 mg·kg^-1之间,平均为246.0 mg·kg^-1,其含量变化幅度较大,主要受到土壤有机碳、p H、茶园管理方式、植茶年限、成土母质以及全氮量的影响。(1)茶园土壤的ωmic与有机碳的质量分数(ωorg)呈显著正相关,与p H存在一定范围的正相关,改良过度酸化的土壤能明显提高ωmic。(2)ωmic随植茶年限的增加呈现先升高后降低的趋势,在45年左右的茶园中含量最高,达到了(597.7±89.2)mg·kg^-1。(3)有机管理茶园的ωmic显著高于转换茶园和常规茶园(P<0.05)。(4)花岗岩、安山斑岩和红砂岩发育的茶园土壤的ωmic显著高于第四纪红土和石灰岩发育的土壤(P<0.05)。(5)ωmic随茶园全氮量的增加也呈先升高后降低的趋势。在茶园土壤ωmic的影响因素中,影响最大的是土壤有机碳,其次为p H、成土母质、植茶年限及全氮量。由此可见,要提高茶园土壤的ωmic,可采取多施有机肥,推广有机茶园管理模式,合理施氮,适当提高土壤p H和改植换种老茶园等措施。     

重庆市茶园蚂蚁物种多样性及空间分布格局

为筛选茶园害虫的蚂蚁类天敌,采用样地调查法研究了重庆主要产茶区(海拔371~1 068 m)茶园蚂蚁物种多样性特征与空间分布格局。在重庆主要产茶区茶园,设置3条垂直带,每条垂直带划分为低海拔(300~500 m)、中海拔(500~700 m)和高海拔(700 m以上)3个水平带,每个水平带设置3~4块样地,调查茶园的蚂蚁物种组成、群落多样性及空间分布特点。在物种多样性方面:共采集到蚁科昆虫4亚科,39种。各水平带物种丰富度为7~13种,Shannon-Wiener多样性指数0.55~1.25,Pielou均匀度指数0.08~0.16,Simpson优势度指数为0.26~0.65;各水平带蚂蚁群落多样性指数差异不显著,表明其多样性水平比较一致。群落相似性指数为0.22~0.48,多数处于中等不相似水平。在群落优势种方面:不同海拔茶园蚂蚁优势种数目1~3种,常见种最多达6种,最少仅1种;稀有种最多17种,最少5种;从重庆范围来看,重庆主要产茶区茶园蚂蚁群落共有7种优势种。在蚂蚁空间分布方面:有17种蚂蚁具有较宽的垂直空间分布,活动范围涵盖土壤、地表和树冠,有作为天敌昆虫资源的可能。仅有9种蚂蚁在不同水平带的茶园中均有分布。结合群落相似性与多样性分析结果,重庆茶园生境破碎,蚂蚁群落间物种交流受阻,不利于茶园生物多样性水平的稳定与提高。     

Changes in bird species composition on a remote and well-forested Wallacean Island, South-East Asia

In South-East Asia patterns of forest loss can predict the number of threatened birds. On the oceanic islands of Wallacea, small-scale agriculture, rather than commercial logging, is the main cause of forest loss and conversion, but few studies have directly examined their responses to land use. In 2001, I studied the birds of primary forest and anthropogenic gardens on the well-forested, and remote, Damar Island (198 km²) in the Banda Sea. Furthermore, I examined broad changes to the islands bird fauna by comparing baseline bird lists obtained in the 19th century with 2001 data. The conversion of primary forest to garden resulted in substantial changes in avifaunal composition, and to the abundance of individual bird species, particularly to frugivorous and globally restricted-range species. Of 15 common birds, four were significantly more abundant in primary forest (blue-tailed imperial pigeon Ducula concinna, northern fantail Rhipidura rufiventris, golden whistler Pachycephala pectoralis and red-chested flowerpecker Dicaeum maugei) and one (scaly-breasted honeyeater Lichmera squamata) was more abundant in garden habitat. Incidental observations provided further evidence that many forest specialists (including the island endemic Damar flycatcher Ficedula henrici) rarely, if ever, used garden habitats notwithstanding its relative proximity. The number of resident birds recorded in 2001 (39) was similar to the 1890s (38), but six forest-dependent passerines were extirpated between samples. These losses are associated with the conversion of 25% of the primary forest to modified habitat since the 1890s, but given the sparse species and environmental change data available it is impossible to definitively pinpoint this as the only cause underlying the species losses. This study demonstrates that remote and relatively well-forested islands are not immune to the threatening processes impacting bird populations elsewhere in South-East Asia.     

不同管理模式对花椒园节肢动物群落结构及稳定性的影响

为探讨有利于花椒园节肢动物群落结构的管理模式,2012年对云南省昭通市3种常见管理模式(粗放、免耕、精细)下花椒园节肢动物群落的组成和结构进行了系统调查。采用群落特征指数和主成分分析法对节肢动物群落特征、季节性变化及稳定性进行了研究。结果表明,调查区花椒园节肢动物群落由2纲9目97科318种组成,其中害虫主要种类为大青叶蝉(Tettigoniella viridis)、小绿叶蝉(Empoasca flavescens)、棉蚜(Aphis gossypii)和小长蝽(Nysius ercae),天敌主要种类为大灰食蚜蝇(Metasyrphus corolla)、斑食蚜蝇(Melanostoma scalare)、环腹瘿蜂属一种(Frigates sp.)和翠绿巨胸小蜂(Perilampus prasinus)。3种模式下,粗放模式丰富度(21.985 7)最高,但植食性类群亚群落个体比例(36.13%)也最高。免耕模式的多样性指数(3.649 1)、均匀性指数(0.694 3)和稳定性指数Ss/Si(0.074 7)、Nn/Np(0.557 2)、Sd/Sp(0.545 5)、Nd/Np(1.467 8)均高于其他两种模式。精细模式的优势度最高(0.193 1)、群落特征指数全年波动较大,受到外界干扰强烈。免耕模式下天敌对主要害虫的跟随作用较好且害虫爆发高峰期的虫口数量(最高81头)皆低于同时期粗放模式(最高189头)与精细模式(最高123头)。主成分分析表明粗放模式与精细模式下主导群落变化的主要因素为害虫,而免耕模式下天敌起到了主导作用,其对害虫的调控效果较好。因此综合考虑生态经济效益,免耕模式为有利于当地花椒种植的管理模式。     

Rose (<Emphasis Type="Italic">Rosa</Emphasis> spp.) Germplasm Resources of Turkey

Turkey is one of the most important Rose germplasm centers. About 25% of all rose species are native to Turkey. Flowers of some rose species, such as Rosa gallica and Rosa damascena, have been used for rose oil and rose water production in Anatolia for a long time. Fruits (rose hip) of some other species have economic value and are also used for medicinal purposes. In this paper, Rosa species found in Turkey are listed, their distribution within the provinces is listed, as well as their characteristics and uses.     

The historic man-made soils of the Generalife garden (La Alhambra, Granada, Spain)

We studied the soils of the Patio de la Acequia garden of the Generalife, a palatial villa forming part of La Alhambra, a World Heritage Site in Granada, Spain. This garden, which is estimated to be around 700 years old, is the oldest historical garden in the Western World. The soils are man‐made cumulimollihumic‐calcaric (hypereutric, anthric) Regosols. Noteworthy amongst the main pedogenic processes, in relation to the human activities of cultivation, irrigation and tillage, are horizonation, melanization (the contents of organic carbon varied between 0.59% and 8.87%, and those of P₂0₅ extracted with citric acid between 723 mg kg⁻¹ and 7333 mg kg⁻¹, with maximae in the Ap horizons) and structure formation. The soil fabric, studied at the ultramicroscopic level using scanning electron microscopy, is of laminar and partition‐walls’ type in the lower horizons, depending on the microped zones. The partition‐walls’ fabrics found are different to those of the possible pre‐existing sedimentary fabrics. These are numerous lithological discontinuities and at least two burials, leading us to deduce that there have been two main stages of filling with materials in the formation of these soils. The first is Arabic‐Medieval (13th century), when the garden was created, its surface being some 50 cm below the level of the paved area of the present patio. In the deeper parts, the materials employed in the fill are similar to the in situ soils of the zone, unaffected by the buildings. The second stage is Christian (15th century to the present day). During this period the Medieval garden was gradually buried under a layer of materials from the nearby soils and/or sediments mixed with manure until the surface was only just below the level of the paved area of the patio. In this work we discuss the difficult classification of these relatively little studied soils. In spite of their being clearly related to human activity, they are not classified as Anthrosols in the FAO system (1998) because soil materials cannot be classified as anthropopedogenic or as anthropogeomorphic.