农林复合经营技术──一、我国农林复合经营的兴起

一、我国农林复合经营的兴起南京林业大学姜志林1什么叫农林复合经营农林复合经营又称混农林业、农用林业、林农间作等。农林复合经营是将林业和农业或牧业或渔业等结合在一起进行复合经营的一种传统的土地利用方式。而不是单一经营林业或农业或牧业等。由于农林复合经营的对象是把林业与农业结合在一起，组成一个生态系统，故又称农林复合生态系统。农林复合经营是一个很广泛的概念，各家理解不一。现在为多数人接受的是国际农林复合经营研究委员会（ICRAF）下的定义：“农林复合经营是在同一土地经营单元上，将在生态和经济上存在相互联…     

城郊农林复合生态系统建设与管理

本文通过对城郊农林复合生态系统含义、原理、管理技术等方面的论述 ,提出建设农、林、牧、副协调发展 ,集高新技术、现代农林业技术、管理技术于一体的多功能城郊农林复合生态系统 ,成为城市森林生态工程的重要组成部分     

农林复合经营的研究进展

农林复合经营系统是一种土地利用技术和系统的复合名称,是有目的地把多年生木本植物与农业和牧业用于同一土地经营单位,并采取同一时期或短期相同的经营方式,在农林复合生态系统中,在不同组成之间存在着生态学和经济学方面的相互作用。农林复合经营系统在充分利用生态空间、挖掘生物资源潜力等方面表现出强大的生命力,在世界各国,尤其是发展中国家得到了广泛的应用。     

定西地区黄土丘陵沟壑区农林复合生态系统分类研究

在总结和参考国内外农林复合经营系统分类体系研究成果的基础上,根据定西地区黄土丘陵沟壑区气候类型、立地条件、社会经济、农林复合经营现状,以及农村经济和区域生态环境建设综合发展的需要,提出了定西地区黄土丘陵沟壑区农林复合生态系统分类原则及分类体系。     

关于农林间作的历史

关于农林间作的历史华隼７０年代中期以来，世界各国兴起了林农复合生态系统的研究与实践。在国外，有些文献将林农复合生态系统的实践追溯到１００多年前缅甸农民从事的农林间作，殊不知我国的农林间作历史更为悠久。仅据部分古籍的文字记载便可推断，我国农林间作的历史...     

建设农林复合系统 促进生态良性循环

<正> 农林复合生态系统(Agroforestry),根据国际农林业研究委员会最近的定义:是一种土地利用系统和应用技术相结合的、一个人工经营的农田、森林复合名称。其目的是为提高土地的空间利用率和增加土地总产量(增加生产和收入)。而方法即在同一块土地上,在空间位置和时间顺序上,既栽培林木又种植农(包括牧、渔、副)作物的联合经营。在农林复合生态系统内,有生态和经济及不同成分之间的相互作用。     

农林复合生态系统机理研究文献综述

一、农林复合生态系统概述关于农林复合生态系统(Agroforestry)的定义,1978年国际农林复合生态系统研究委员会的第一任主席King在一篇有关Agroforestry的文章中,把其定义为:"在同一土地单元内将农作物生产与林业和畜牧业生产结合起来,使土地总生产力得以提高的持续性土地经营体系"(杨修、贾渝彬等1995-1996)。1982     

农林复合生态系统机理研究文献综述

一、农林复合生态系统概述关于农林复合生态系统（Agroforestry）的定义,1978年国际农林复合生态系统研究委员会的第一任主席King在一篇有关Agroforestry的文章中,把其定义为：＂在同一土地单元内将农作物生产与林业和畜牧业生产结合起来,使土地总生产力得以提高的持续性土地经营体系＂（杨修、贾渝彬等1995-1996）。     

中国可持续农业发展中的农林复合系统评价

中国是一个具有生物地理多样性和复杂社会经济条件的大国，其农林业资源的可持续性正在受到变化的自然和社会经济环境的严峻挑战。分析表明，多样化的农林复合系统（Ａｇｒｏｆｏｒｅｓｔｒｙｓｙｓｔｅｍｓ）在中国各主要区域可持续农业发展中起着十分重要的作用。然而，适用于多样化的农林复合系统综合评价方法的缺陷，使农林复合系统具有的优势难以得到真实的反映。文章从单一目标评价、多目标评价、风险评价和社会经济评价四个方面，分析了其在中国农林复合系统评价中的应用。分析显示中国农林复合系统的评价主要局限于财务效益方法。从农业可持续发展的宏观背景出发，这显然是不够的。文章接着探讨了在人类生态学理论的基本框架中，农业生态系统分析方法、农业系统分析方法及农林复合系统设计与诊断方法在农林复合系统评价中综合运用的可能性。并指出模型方法，特别是多目标规划方法，由于其与农林复合系统多功能特性一致，具有很大应用潜力。文章最后给出了农林复合系统综合评价的理论构架，指出农林复合系统是个特殊的具有多层次、多功能和多效益特征的农业生态系统。农林复合系统的综合评价必须从可持续发展的观点出发，设计和选择包括生态、经济和社会文化方面的多目标标准体系，并在不同层次     

海岸带农林复合生态系统建立技术

本文阐述了沿海防护林体系建设工程中进行农林复合经营的作用和建立农林复合生态系统的方法，对农林复合试验区的建立、林网树种选择、防护林带营造、模式结构和配置方式等方面作了探讨，提出海岸带农林复合生态系统的建立技术。     

Floristic composition and management of cropland agroforest in southwestern Bangladesh

Cropland agroforest is an important production system in the southwest region of Bangladesh. This study focused on the floristic composition and management of existing cropland agroforests. A total of 313 cropland agroforests were surveyed and 83%respondents practiced pure agroforestry while the remaining 17% practiced agroforestry with fisheries. A total of 18 forest trees and 2 shrubs were recorded from 11 families and 59 species of agricultural crops were from 28 families. A higher proportion （79%） of cropland agroforests were occupied small land areas （0.12-0.80 ha）. About 63% of respondents planted trees for fruit production and 47%for timber production, and 35%of respondents engaged in commercial production （35%）. Swietenia macrophylla was the most prevalent species （relative prevalence 20.83） followed by Man-gifera indica （relative prevalence 15.57） and Cocos nucifera （relative prevalence 7.08）. Shorter spacing was used for timber and fuel wood species and wider spacing for fruit trees. A wide range of rotation periods, from 5 to 25 years, was observed for both cases. The use of chemical fertilizer was highest followed by cow dung and compost in cropland agroforests. Overall management practices of cropland agroforest in southwest Bangladesh were determined by the end product and local demand.     

Tropical forest architectural analysis as applied to agroforests in the humid tropics: The example of traditional village-agroforests in West Java

The features of the tropical forest are found in Sundanese village-gardens. They are rich in plant species, a layered structure of the vegetation, existing patchwork and succession of sylvigenetic phases (from pioneer to homeostatic phase). These traditional agroforests reflect the sourrounding forest ecosystem, simplifying the features. The architectural method of tropical forest analysis is applied to Sundanese agroforests, but here each plant is both a structural element of the ecosystem and a producing element of the agricultural landscape. Such structural analysis could represent one aspect of an integral analysis of complex agroforestry systems.     

Agroforestry within REDD+: experiences of an indigenous Emberá community in Panama

Reducing carbon emissions from deforestation and forest degradation (REDD+) has become central to efforts to mitigate climate change. Approximately 10 % of the world’s forests are managed by local and indigenous peoples. Agroforestry may provide these communities with a means to engage in carbon offsetting initiatives without forfeiting access to, or benefits from, forests. Here, we present an analysis of social and ecological data from a four-year-old, reforestation-based carbon-offset project on the collective lands of Ipetí-Emberá, Panama. Mixed-species agroforests or timber-only plots were established by a subset of community members under voluntary carbon-offset agreements with a private client. We (1) describe how plot carbon accumulation trajectories were related to species composition; (2) determine if established agroforests are likely to meet carbon sequestration targets by the end of the 25-year project period; (3) describe the motivations and experiences of participants who chose to establish agroforests; and (4) compare socio-economics of participants versus non-participants. Our study provides data on early mortality, tree growth and the carbon sequestration capacity of 29 species that are commonly used by small farming households in Latin America and elsewhere. The study highlights strategies for reducing risks associated with agroforestry as a carbon sequestration strategy in the context of carbon offset projects, such as the replanting of dead trees and the establishment of a carbon buffer. We also provide evidence to counter claims that offset projects could amplify inequality in rural communities as participants to agroforestry, when compared to non-participants, were not remarkable in terms of their assets or wealth. Overall, this case study provides an encouraging example of how agroforestry may help forest communities engage with REDD+ in a way that benefits both their livelihoods and the global climate change agenda.     

Responses of terrestrial herb assemblages to weeding and fertilization in cacao agroforests in Indonesia

Terrestrial herbs are important ecological components in tropical agroforests, but little is known about how they are affected by agricultural management. In cacao agroforests of Central Sulawesi, Indonesia, we studied the change in herb species richness, cover, and biomass over 3?years in 86 subplots subjected to high and low weeding frequency as well as fertilized and non-fertilized treatments. We recorded 111 species with rapid changes in species composition between the 3?years. Species richness increased sharply in the 2nd year, presumably as a result of changes in the management with the experimental regimes, and decreased in the 3rd, probably due to competitive exclusion. Species richness, cover, and biomass were all significantly higher in the infrequently weeded plots than in the frequently weeded ones, but there were only slight responses to the fertilization treatment. An indicator species analysis recovered 45 species that were typical for a given year and a further eight that were typical for certain treatments, but these species showed no clear patterns relative to their ecology or biogeography. We conclude that the herb assemblages in cacao agroforests are quite resilient against weeding, but that the cover of species shifts rapidly in response to management.     

The role of complex agroforestry systems in the conservation of forest tree diversity and structure in southeastern Ghana

The role of different agroforestry systems in the conservation of plant diversity and forest structure has not been directly compared in many agricultural dominated landscapes. In this study, we investigated tree diversity and forest structure in a complex agroforestry landscape traditionally grown for cocoa and mixed food crops and compared these to the natural forest in southeastern Ghana. The study was carried out using 36 25 m × 25 m plots. There was significant difference [95% Confidence Interval (95% CI)] in the native forest/non-crop tree species richness between the natural forest and the agroforest farmlands but species richness was similar between the cocoa and mixed food crops agroforests. The density of native forest/non-crop trees was significantly higher (P < 0.05) in the natural forest but similar between cocoa and mixed food crops agroforest. Similarly, the basal area of native forest/non-crop trees was significantly higher (P < 0.05) in the natural forest but comparable between cocoa and food crops agroforest. Of the 20 most abundant native forest/non-crop trees recorded, 12 of them showed significant responses (P < 0.05) to land use change with nine of the species significantly abundant in the natural forest relative to the agroforest systems. Eighteen native forest/non-crop trees species in the agroforestry systems were commonly recorded as being used; 100% of them being used as fuel wood with 83.3 and 77.8%, respectively, used as medicines and materials. The findings of this study suggests that although complex agroforestry systems are a poor substitute for the natural forest the heterogeneous mosaic landscape in which complex agroforestry forms part can be strategically managed to maximize the benefits of both sustainable agriculture production and conservation of plant diversity by acting as buffer between protected areas and intensively managed areas.     

Potential of indigenous multistrata agroforests for maintaining native floristic diversity in the south-eastern Rift Valley escarpment, Ethiopia

Most studies undertaken in the field of agroforestry have focussed on system design, soil fertility management, and system interactions. Less emphasis has been placed on biodiversity aspects. The aim of this study is to investigate the potential of indigenous, multistrata agroforests for maintaining native woody species diversity in the south-eastern Rift Valley escarpment, Ethiopia. A total of 60 farms, representing three agroforest types (enset-AF, enset-coffee-AF and fruit-coffee-AF), were randomly selected along altitudinal gradients. Enset (Ensete ventricosum) is a perennial, herbaceous monocarpic banana-like plant which serves as a food plant in Ethiopia. The three agroforests are results of the domestication of natural forests and intensification of the landuse systems centuries ago. Sample-based assessment protocols were employed to place sample quadrats and to measure all individuals in the quadrats. A total of 58 woody species, belonging to 49 genera and 30 families, was recorded. Of all woody species identified, 86% were native. The highest proportion of native woody species was recorded in enset-AF (92%), followed by enset-coffee-AF (89%) and fruit-coffee-AF (82%). Among native tree species, Millettia ferruginea and Cordia africana were the most widespread. In all, 22 native woody species were recorded as of interest for conservation, acccording to IUCN Red lists and local criteria. Among them, Pygeum africanum and Rhus glutinosa were categorised as vulnerable in the wild, and in need of conservation priority. The introduction of non-native fruit trees in agroforests can be a threat to maintenance of native woody species. Management strategies favoring enset and coffee will also put other native tree species at risk. A smaller number of native woody species was recorded in fruit-coffee-AF, but a higher mean basal area and stem number. The mean basal area and stem number ranged from 5.4?±?0.5 to 11.7?±?1.0?m^2?ha^?1 and 625?±?84 to 1,505?±?142 stems?ha^?1, respectively. Altitude explained 68 and 71% of the variation in species richness and abundance, respectively. Finally, it is concluded that recognition of the indigenous agroforestry system as an option for maintaining native woody species should be given more attention, to counteract the local threat of these species from the wild.     

Predatory beetles in cacao agroforestry systems in Brazilian Atlantic forest: a test of the natural enemy hypothesis

The natural enemy hypothesis predicts a positive correlation between plant species diversity and natural enemy control. This study aimed to evaluate the role of traditional cacao agroforests, known as “cabrucas,” on the conservation of the predatory beetle community compared to that of monodominant rubber agroforests. Predatory beetles were sampled in three habitats in Southeastern Bahia, Brazil: cabrucas and rubber agroforests and native Atlantic forests. In each habitat, 18 10 m² plots were established, in which canopy cover was measured and beetles were sampled with a modified Malaise/window trap. Land use intensification did not affect the composition of predatory beetles, with the presence of widely distributed species that are also capable of colonizing simpler environments such as the rubber agroforest. Canopy cover had a positive effect on generalist predator diversity and we observed a reduction in the abundance and species richness of generalist predators with increasing habitat homogenization. Despite the simplified structure of the habitat, the remaining tree diversity and canopy cover in cabrucas supported a community of generalist predators similar to the one found in the native forest. Species diversity of bark beetle predators was higher in cabrucas, which may be due to the high diversity of bark beetles and the favorable abiotic conditions, whereas the low abundance of prey in the native forest and severe abiotic conditions in the rubber agroforest probably determined the lower diversity of generalist predators in these habitats. Cabrucas play an important role in the conservation, supporting a community of predatory beetles more similar to the one found in native forest and that is more effective at controlling populations of herbivores than in homogeneous rubber agroforests.     

Indigenous agroforestry of Pohnpei

Plant species and cultivars of the indigenous agroforestry system of Pohnpei were surveyed in transects through 54 randomly-selected farms. The agroforestry system was characterized by extensive cultivation of yams (Dioscorea), aroids (Alocasia), and Piper methysticum under a permanent overstory of breadfruit, coconut, and forest remnant trees and a middle canopy of Hibiscus tiliaceus, Musa spp., and Morinda citrifolia. In the 10 ha of survey plots, 161 species were found, of which 102 were trees, shrubs, and crops and 59 were uncultivated herbaceous plants. Numbers of tree, shrub, and crop species per farm ranged from 16 to 37 with an average of 26. Twenty-eight breadfruit and 38 yam cultivars were found in the survey plots, showing that cultivar diversity is an important component of the biological diversity maintained and utilized in Pohnpeian agroforests.     

Community assessment of agroforestry opportunities in GaMothiba,South Africa

The sustainability of cocoa growing systems in the humid tropics is debatable. Socio-economic and technical data were obtained from 1,171 cocoa farmers and 1,638 cocoa plantations to assess the long-term dynamics of cocoa agroforests in central Cameroon since the beginning of the twentieth century. On-site, we estimated the age of the cocoa trees and measured their density in a sub-sample of 402 cocoa plantations. We inventoried associated woody species in 45 cocoa plantations from this sub-sample. Our results revealed a high Shannon index for the cocoa plantations (2.6) and showed that an average of 25 tree species per cocoa plantation had been planted with the cocoa trees at a density of 120 trees ha⁻¹. Surveys indicated that there had been no mineral fertilization. Nearly 70% of the cocoa agroforests were over 40 years old, and all farmers continuously regenerated their cocoa tree stands. Irrespective of the cocoa plantation age, the cocoa tree density remained over 1,000 plants ha⁻¹, and fermented dried cocoa yields were 255 kg ha⁻¹ on average. Cocoa agroforests occupied 60% of the cultivated area on farms and cocoa sales accounted for 75% of total farm income. Almost a third of the farmers were from the area and under 40 years old. In conclusion, our results show that the farmers’ agroforestry practices, in addition to the fact that the cocoa tree stands were continuously regenerated and passed down between generations of farmers, could explain the long-term dynamics of cocoa agroforests in central Cameroon.     

The effects of management and plant diversity on carbon storage in coffee agroforestry systems in Costa Rica

Agroforestry systems can mitigate greenhouse gas (GHG) emissions, conserve biodiversity and generate income. Whereas the provision of ecosystem services by agroforestry is well documented, the functional relationships between species composition, diversity and carbon (C)-storage remain uncertain. This study aimed to analyze the effects of management (conventional vs. organic), woody plant diversity and plant composition on aboveground and belowground C-storage in coffee agroforestry systems. It was expected that organic farms would store more C, and that an increase in plant diversity would enhance C-storage due to complementarity effects. Additionally, it was expected that steep slopes decrease C-storage as a result of topsoil erosion. Woody plants were identified on 1?ha plots within 14 coffee farms (7 conventional and 7 organic). C-stocks in trees, coffee plants and roots were estimated from allometric equations. C-stocks in litter and topsoil (0?C25?cm) were estimated by sampling. On average, farms stored 93?±?29?Mg?C?ha^?1. Soil organic carbon accounted for 69?% of total C. Total C-stocks were 43?% higher on organic farms than on conventional farms (P?<?0.05). Conventional and organic farms differed in vegetation structure, but not in species diversity. It was found that the combined effect of farm type, species richness, species composition and slope explained 83?% of the variation in total C-storage across all farms (P?<?0.001). Coffee agroforestry in general and organic farms in particular may contribute to GHG mitigation and biodiversity conservation in a synergistic manner which has implications for the effective allocation of resources for conservation and climate change mitigation strategies in the agricultural sector.