甘肃中部黄土丘陵沟壑区农林复合生态系统综合效益评价

在对甘肃中部黄土丘陵沟壑区典型流域农林复合生态系统大面积调查和示范区定点观测的基础上，参考国内外农林复合生态系统综合效益评价的研究成果，采用层次分析法(AHP)，对区域内典型农林复合生态系统模式：沙棘一仁用杏一紫花苜蓿复合经营模式(T1)、侧柏一甘蒙柽柳一紫花苜蓿复合经营模式(T2)、甘蒙柽柳一农作物复合经营模式(3)、雨水集流庭院经济复合经营模式(T4)、围栏放养模式(T5)，以坡耕地农田生态系统(T6)作为对照，从生态效益、经济效益、社会效益及综合效益方面进行了分析和评价．该研究成果将为甘肃中部黄土丘陵沟壑区水土保持综合治理、退耕还林工程、实现当地农业和林业可持续发展及提高农村社会经济发展水平提供理论依据。

Evaluation on the Synthetic Benefits of the Agro-forest Compound Ecosystem in the Loess Hilly-ravine Region in the Central Part of Gansu Province

In this paper, the ecological benefits, economic returns and social effects of the agro-forest compound ecosystem are analyzed and evaluated based on the large-area investigation and the stationed observation in the demonstration area of the agro-forest compound ecosystem in the typical watersheds of the loess hilly-ravine region in the central part of Gansu Province by referring to the study achievements in the evaluation of the synthetic benefits of the agro-forest ecosystems at home and abroad and by using the analytic hierarchy process. The agro-forest compound ecosystem in the study area includes the management modes of Hippophatae rhamnoides-Armeniaca vulgarix-Medicago sativa, Platycladus orientalis-Tamarix austromongolica Nakai-Medicago sativa, Tamarix austromongolica Nakai-crops, courtyard industrial crops irrigated with converged rainwater, enclosure-grazing animal husbandry, etc., and the benefits of the sloped-farmland ecosystem is compared with that of these modes. The study achievements can provide the theoretical basis for the water and soil conservation, the project of withdrawing from farming to afforesting and grass planting, achieving the sustainable development of forestry and agriculture, and promoting the rural social and economic development in the loess hilly-ravine region in the central part of Gansu Province.