Associations between soil carbon and ecological landscape variables at escalating spatial scales in Florida,USA

The spatial distribution of soil carbon (C) is controlled by ecological processes that evolve and interact over a range of spatial scales across the landscape. The relationships between hydrologic and biotic processes and soil C patterns and spatial behavior are still poorly understood. Our objectives were to (i) identify the appropriate spatial scale to observe soil total C (TC) in a subtropical landscape with pronounced hydrologic and biotic variation, and (ii) investigate the spatial behavior and relationships between TC and ecological landscape variables which aggregate various hydrologic and biotic processes. The study was conducted in Florida, USA, characterized by extreme hydrologic (poorly to excessively drained soils), and vegetation/land use gradients ranging from natural uplands and wetlands to intensively managed forest, agricultural, and urban systems. We used semivariogram and landscape indices to compare the spatial dependence structures of TC and 19 ecological landscape variables, identifying similarities and establishing pattern–process relationships. Soil, hydrologic, and biotic ecological variables mirrored the spatial behavior of TC at fine (few kilometers), and coarse (hundreds of kilometers) spatial scales. Specifically, soil available water capacity resembled the spatial dependence structure of TC at escalating scales, supporting a multi-scale soil hydrology-soil C process–pattern relationship in Florida. Our findings suggest two appropriate scales to observe TC, one at a short range (autocorrelation range of 5.6 km), representing local soil-landscape variation, and another at a longer range (119 km), accounting for regional variation. Moreover, our results provide further guidance to measure ecological variables influencing C dynamics.     

Associations between green space,air pollution and birthweight in Sydney Metropolitan Area,Australia

Growing number of evidence have reported that exposure to air pollution was associated with unfavourable birth outcomes while increased exposure to green spaces was associated with better birth outcomes. However, the effect of interactions between air pollution and green spaces on pregnancy outcomes remain unclear. Using the data on all the live births recorded in Sydney between 2016 January and 2017 December, we built up multilevel linear and logistic regression models with random intercepts for statistical area level 2 (SA2) to examine the association between residential levels of air pollution (NO2, PM2.5, SO2 and O3) and pregnancy outcomes including birthweight, low birthweight, and preterm birth. This was followed by assessment of potential effect modification by green space quantity by fitting 2-way interaction term between each air pollutants and green space quantity separately. Furthermore, building on the 2-way interaction term, we explored 3-way interactions by adding area level socio-economic status and population density. Higher levels of PM2.5, NO2 and SO2 were statistically significantly associated with decrease in birthweights (p < 0.05) in the adjusted models. We observed statistically significantly association between the lower risks of preterm birth and higher levels of NO2 in the adjusted models (p < 0.05). However, none of the other air pollutants were statistically significantly associated with the odds of low birthweight and preterm birth. In the adjusted models, green space quantity was statistically significantly associated with reduced odds of preterm birth (p < 0.05). The results for birthweights were in the same direction (p < 0.05) however, some of these associations did not remain statistically significant after adjusting the models for air pollution. In general, no associations were found for low birthweight. Statistically significant 2-way interactions between green space quantity and NO2, PM2.5 and SO2 levels indicated that association between moderate levels of NO2, PM2.5 and birthweight weakened in the greener areas (>20 %) especially in the affluent and densely populated areas while the effect of SO2 did not differ consistently across green space levels with benefit of exposure to the greenest areas (>40 %) was evident, yet not statistically significant. Our findings suggest that increasing green spaces in cities may help supporting a healthy start in life by decreasing harms of moderate levels of air pollution. Replication in different contexts and consideration of potentially contrasting results with different types of green space is warranted.     

浅谈中国传统吉祥图案在小区环境小品设计中的运用

本文通过分析国内住宅小区的园林景观设计现状,总结了中国传统吉祥图案的分类,探讨了中国传统吉祥图案在环境小品设计中的作用,指出了吉祥图案在现代环境小品中的设计原则以及环境小品设计中应注意的问题。     

Neighborhood satisfaction and use patterns in urban public outdoor spaces: Multidimensionality and two-way relationships

Neighborhood satisfaction and use patterns in public outdoor spaces are generally viewed as single entities, ignoring their multidimensionality as well as detailed associations between them. Such a general assessment raises questions of the kinds of neighborhood characteristics that accrue to satisfaction, and the variety of environmental affordances perceived by residents with respect to nearby outdoor settings. Given the significant role of these factors in people’s life satisfaction and wellbeing, a nuanced approach is needed to help us better understand people-environment relationships and examine practical solutions for creating more livable neighborhoods. This study investigated two-way associations between four aspects of neighborhood satisfaction and three forms of use, as well as the role played by perceived barriers to neighborhood use in these associations. A random sample of 434 Chicago residents participated in a survey (mailed and on-site) with a five-point rating scale. The three major findings through generalized linear modeling include; 1) multidimensionality of both neighborhood satisfaction and use patterns as important to consider in people-environment studies, 2) the significant roles as predictors and as outcomes played by both neighborhood satisfaction and use patterns, with only one factor from each set showing a two-way relationship, and 3) the main effect of perceived barriers on three of the neighborhood satisfactions, and their interactive effect with several of the use pattern and satisfaction factors. These findings contribute to our understanding of people-environment relationships in urban public spaces and provide insights for improving neighborhood satisfaction and frequency of use of public outdoor spaces.     

栽培环境对黄秋葵数量性状的影响

为了探究栽培环境对黄秋葵数量性状的影响程度,笔者以海南露地栽培环境为对照,以3种不同类型的6个黄秋葵栽培种为材料,分析大棚和露地2种栽培环境下黄秋葵叶片、果实等14个数量性状的表达结果。结果表明,黄秋葵叶片长度、叶片宽度、第一果实着生高度3个性状受栽培环境影响较明显,果柄长度、果柄粗度、果实长度、果实横径4个性状受环境影响程度与黄秋葵品种类型有关,其中绿秋葵果柄长度与果柄粗度受环境影响程度存在正相关性;五角黄秋葵心室数表达最稳定,多角形黄秋葵心室数易受环境影响。     

The relationship between the distribution and use patterns of parks and their spatial accessibility at the city level: A case study from Tehran,Iran

Parks are recognised as important elements of urban green infrastructure and for providing many benefits to city residents. In countries where urban growth is unplanned and sprawling, green space provision falls behind, inadequate amounts are provided or spaces are not located in the most effective places. Tehran, the capital of Iran, has experienced huge growth in population and corresponding sprawl in recent years. There has been no study of the effectiveness of parks as part of the range of green spaces in the city − their location, accessibility within the urban structure, relationship to the socio-demographic character of the population, amount per capita or quality and condition. Using a combination of existing data supplemented by new data from site surveys, this study firstly looked at the citywide scale of public open space in relation to population and socio-economic patterns. Second, a representative sample of 16 parks was examined in terms of their accessibility within the urban street structure using space syntax. The syntactical results were correlated with several different aspects of each park collected and rated on a 1–5 scale. The results showed a wide range of availability of parks with no specific pattern related to whether the district is better off or poor. The data on green space per district was often heavily biased by the presence of large areas of forest park or non-recreational land which gives a false picture.Many of the best parks are poorly integrated into the street network and found in the better off districts yet are very popular because they are “destination” parks in cooler, hilly areas. Poorly integrated parks in the inner city districts tended to show lower levels of maintenance, were often little used and had vandalism. Much more attention is needed to provide green space in an equitable way.     

Interactions between past land use, life-history traits and understory spatial heterogeneity

Past land use has contributed to variability in the distribution of herbaceous species by reducing plant abundance and altering species’ chances of recolonizing suitable habitat. Land use may also influence plant heterogeneity by changing environmental conditions within stands. We compared the variability of understory herb abundance in southern Appalachian forests with different land-use histories to examine how past land use influenced plant heterogeneity. The cover of eleven focal species or genera was estimated and mineral soil concentrations were determined during 2001 and 2002 in eight stands that were farmed, logged, or had no disturbance history (reference) in western North Carolina. Analysis of the coefficients of variation revealed that the abundance of understory plants was more heterogeneous in disturbed stands compared with reference stands. However, when nutrient availability differences were accounted for by detrending the plant cover data, understory variability within stands declined, and no differences between disturbed and reference stands could be distinguished. This finding suggests that nutrient availability has important effects on plant heterogeneity, which depend on past land use. Species dispersal, seed size, and phenology also explained variability in the spatial heterogeneity of plants, but generally only before soil nutrient differences were statistically controlled. In addition to demonstrating that past land use has long-term effects on plant heterogeneity, these results indicate that soil nutrients may play different roles in determining vegetation patterns in historically altered and unaltered forests.     

Spatial relationship between human population density, land use intensity and biodiversity in the Czech Republic

We test a hypothesis about the spatial coincidence of human population density and species richness, and analyze effects of land conversion and ecosystem use on species richness and landscape diversity in human dominated Central European country, the Czech Republic. We calculated fraction of aboveground net primary productivity appropriated by humans and compared it to the species richness of vertebrate, invertebrate and plant groups and to landscape diversity index in 560 mapping grid squares with grid size approximately 130?km². Spatial correlations and regressions were established between human population density, appropriation of net primary production, land cover and biodiversity. We found positive spatial coincidence between human population density and species richness. Although the amount of net primary production was not related to species richness in general, we found significant negative spatial relationship between ecosystem use intensity and landscape diversity. As the area of the Czech Republic exhibits relatively high land use intensities, spatial patterns of human impacts have important implications for land management and biodiversity conservation in a cultural landscape.     

Scale-dependent importance of environment, land use and landscape structure for species richness and composition of SE Norwegian modern agricultural landscapes

Knowledge of variation in vascular plant species richness and species composition in modern agricultural landscapes is important for appropriate biodiversity management. From species lists for 2201 land-type patches in 16 1-km² plots five data sets differing in sampling-unit size from patch to plot were prepared. Variation in each data set was partitioned into seven sources: patch geometry, patch type, geographic location, plot affiliation, habitat diversity, ecological factors, and land-use intensity. Patch species richness was highly predictable (75% of variance explained) by patch area, within-patch heterogeneity and patch type. Plot species richness was, however, not predictable by any explanatory variable, most likely because all studied landscapes contained all main patch types – ploughed land, woodland, grassland and other open land – and hence had a large core of common species. Patch species composition was explained by variation along major environmental complex gradients but appeared nested to lower degrees in modern than in traditional agricultural landscapes because species-poor parts of the landscape do not contain well-defined subsets of the species pool of species-rich parts. Variation in species composition was scale dependent because the relative importance of specific complex gradients changed with increasing sampling-unit size, and because the amount of randomness in data sets decreased with increasing sampling-unit size. Our results indicate that broad landscape structural changes will have consequences for landscape-scale species richness that are hard or impossible to predict by simple surrogate variables.     

Total antioxidant activities,phenolics, anthocyanins,polyphenoloxidase activities of selected red grape cultivars and their correlations

Sixteen red grape cultivars (Md. Jean Matthias, Öküzgözü, Muscat Hamburg, Cabarnet Sauvignon, Tekirda? Çekirdeksizi, Gewürztraminer, 2B/56, Kalecik karas?, Carignan, Kokulu Siyah, Alfonse Lavallée, Bo?azkere, Adakaras?, Papazkaras?, Mourvedre and Cinsaut) which are grown in Tekirda? Viticulture Research Institute were analyzed for determination of antioxidant activities, total phenolics, anthocyanins, external colour, polyphenoloxidase activities, sugar and acidity. The lowest antioxidant activity (percentage of inhibition on peroxidation in linoleic acid system; AA) was determined in Tekirda? çekirdeksiz extracts as 87.58% and the highest AA was in Mourvedre (93.78%). Total phenolic content (TP) varied from 817 to 3062 μg/ml GAE in the same varieties, respectively. The total anthocyanin (TA) content ranged from 40.3 to 990.8 mg/l fresh weight. The lowest PPO activity was found in Bo?azkere and the highest was in Kalecik karas?. The total sugar content in the analyzed varieties varied between 13.29 and 24.46%. There was stronger correlation between AA and TP than AA and TA.     

Stressed individuals’ preferences for activities and environmental characteristics in green spaces

Everyday modern life offers fewer opportunities for outdoor activities and mental restoration. Outdoor activities in urban green spaces might be a promising means to lower levels of stress. Our hypothesis is that individuals’ Level of Stress (LS) is related to the interaction between preferences for certain perceived sensory dimensions (PSDs) of the outdoor environment and certain types of outdoor activities.A total of 953 randomly selected informants, representative of the Swedish population, answered a postal questionnaire with pre-coded items. The questionnaire consisted of three parts: personal data, preferences for PSDs and for outdoor activities, and self-estimations of health. The study focuses on ill health in relation to Level of Stress (LS). The data was analysed using factor and regression analysis.The results show that individuals reporting high LS are more likely to: be younger adults, women, be on sick-leave, have small children, be dissatisfied with their home environment, experience poorer access to green spaces and, foremost, want to use public green spaces more often.Seventeen different outdoor activity types are identified. The most preferred activity type among the most stressed informants was ‘rest activities’ followed by ‘animal activities’ and ‘walking activities’. All pairs of these three activity types and PSDs showing a significant association were transformed into ‘activity-sensory dimension types’. A regression analysis shows that the most preferred activity-sensory dimension types for informants reporting high LS are ‘animal activities’ in the PSD ‘rich in species’, ‘animal activities’ in the PSD ‘refuge’, and ‘rest activities’ in the PSD ‘nature’.These results may be interpreted as providing information regarding how to plan urban green spaces with certain characteristics that could promote outdoor activities which are preferred by stressed individuals.     

试析生态园林乡土化与城市特色的关系

当前,城市的特色离不开历史人文景观,同样也与自然生态环境密不可分。在生态园林城市的创建中,乡土植物对城市绿地建设的优势日益凸显,因而越来越受到重视。本文针对当前城市园林绿化与城市特色的关系,研究了园林城市建设的背景、出现的问题,并就这些问题提出了几点措施,以供参考。     

Relationship between language characteristics of subcortical aphasia and the lesion sites

AIM: To study the language characteristics and origins of subcortical aphasia. METHODS: One hundred and five patients with unilateral subcortical lesions were confirmed by CT scans. Aphasia examinations, brain electrical activity mapping (BEAM) and CT image standardization were performed at the end of two weeks, one month and two months after onset. RESULTS: Most aphasia patients had lesions in the lateral, front and upper part of basal ganglion. BEAM is largely abnormal in the aphasia patients of lateral type and thalamic aphasia who had serious auditory comprehension disturbance. Prominent dysarthria and dysprosody occurred in aphasia patients with lesions in caudate nucleus. CONCLUSION: Subcortical aphasia has its language characteristics. It is mostly due to the damage of language related zone of hemisphere caused directly or indirectly by subcortical lesions. Thalamus serves as a subcortical center in controlling language and its disturbance causes aphasia in some patients.     

Relationships between sap flow,hydraulic conductivity,and the anatomical characteristics of stems and roots in apple rootstocks of different vigour

Summary

To find a useful parameter that could be related to the degree of rootstock vigour, for rootstock breeding programmes, sap flow, hydraulic conductivity, and the anatomical characteristics of stems and roots were measured in 1-year-old trees of apple rootstocks of different vigour. Sap flow was less active in dwarfing rootstocks than in invigorating rootstocks, when taking leaf area into account, under a controlled temperature of 20ºC with the root zone at 15ºC. The hydraulic conductivities of stems and roots were not consistent with the degree of dwarfing.The hydraulic conductivity of the stem appeared to be related to the diameter and density of the large vessels in the xylem. On the other hand, the phloem-to-xylem ratio in roots with diameters of 1.5 – 2.0 mm, was closely-related to sap flow and the degree of dwarfing. The phloem-to-xylem ratio decreased as the degree of vigour increased. Moreover, the phloem-to-xylem ratio was considered to be related to the ability of roots to absorb and transport water, which was expressed as the root-specific sap flow. Therefore, the phloem-to-xylem ratio could be a useful index for evaluating the potential of apple trees as dwarfing rootstocks.     

山西品粉蚧种群消长规律与环境因子关系研究

山西品粉蚧（Peliococcus shanxiensisWu）,是一种严重危害小叶女贞（Ligustrum quihouicarr）和金叶女贞（Ligustrum vi-caryi）的新害虫,在陕西省1年发生2代,种群消长规律与温度和降雨有密切的关系,尤其冬春季温湿度是影响越冬代雌虫出蛰早晚和第1代发生危害程度的重要因素,冬春季温暖干旱越冬雌虫活动则早。每年发生危害高峰期一般出现在6月上旬～8月上旬,冬春低温多雨雪越冬代危害高峰出现在7月上旬以后。不同栽植方式对山西品粉蚧种群密度的影响：以小叶女贞、金叶女贞和小乔木作为绿篱进行栽植比以小乔木、灌木、草坪混合栽植地段山西品粉蚧虫口密度高,危害严重。     

重庆鲜食葡萄主栽品种巨玫瑰和巨峰的果实性状比较

通过感官品尝评定和果实理化性状测定等,对巨玫瑰和巨峰两个葡萄主栽品种的果实性状进行比较.结果表明,巨玫瑰感官品尝平均分比巨峰高出0.48;果实维生素C含量和可溶性固形物含量比巨峰分别高出3.7μg/g和1%～2%,总酸和单宁含量分别低0.39%和0.182%,风味酸甜适口,且有独特玫瑰香味,品质佳,更受市场欢迎.     

Land use and host community characteristics as predictors of disease risk

Land use has been implicated as a major causal factor in the recent surge of emerging and reemerging zoonotic diseases worldwide. Whirling disease, a parasitic infection caused by the myxozoan, Myxobolus cerebralis, has led to major declines in wild trout populations within the Intermountain West of the USA and is suspected to be exacerbated by land and stream management practices that create favorable habitat for the oligochaete host, Tubifex tubifex. Our objectives were to quantify relationships between whirling disease risk and (1) land use and (2) characteristics of the oligochaete host community within four major watersheds in western Montana. Risk was quantified by the severity and prevalence of infection in caged sentinel rainbow trout. A geographic information system (GIS) was used to model land use (e.g., agriculture, mines) within watersheds. Importance of predictor variables was assessed using regression tree and random forest analyses. A low proportion of riparian forest, high road density, high oligochaete density, and high Limnodrilus hoffmeisteri density were identified as important predictors of high risk. Although we did not examine the mechanisms underlying these correlations, a low proportion of riparian forest and a high road density likely increase stream sedimentation, thus, increasing habitat for oligochaetes. Although relationships identified are not necessarily causal, the ability to predict areas most at risk of M. cerebralis establishment and proliferation using broad scale predictors should serve as a useful management tool within Montana and elsewhere.     

甜和不甜西瓜果实中糖积累及相关酶活性初析

<正>目的与意义:棉子糖半乳糖苷系列寡糖(RFO)的水解对于西瓜果实中糖的积累至关重要,然而大众对于α-半乳糖苷酶在西瓜果实发育过程中的作用知之甚少。之前并没有关于高糖西瓜和低糖西瓜中糖积累及酶活性进行过系统的报道。研究了高糖西瓜和低糖西瓜两个亚种中果实糖代谢机制的差异,及2种西瓜中心果肉和中果皮的糖代谢相     

柑橘小实蝇生物学特性与温度的关系

为有效控制柑橘小实蝇的发生、蔓延和危害,通过对其2009～2010年室外饲养观察,结果表明:柑橘小实蝇生物学特性与温度有着十分密切的关系,温度不仅对雌虫产卵前期长短和产卵所需时间有明显影响,而且当平均温度在20.3～29.9℃之间时,成虫交配初见至终见期随温度升高而延长;在不同的温度时段成虫产卵期和每只产卵粒不同;幼虫历期随着温度升高而天数缩短;成虫对低温敏感度不高;在本市不能越冬;随着温度的升高羽化率降低等结论。这将对柑橘小实蝇防控技术研究、预测预报提供科学依据,从而确保衢州市柑橘安全生产和农村稳定。