摘要
我国半干旱地区农业生产力低下和生态环境恶化的根源在于系统内的同化作用被强烈弱化，而异化作用却异常活跃。表现为植被破坏、农业生产力低下、土壤水蚀和风蚀严重、土壤肥力持续下降，扩大开垦面积进一步导致问题的严重化。这两大系统功能的不协调变化就是所谓的“生态平衡失调”，只有同化作用得到有效提高，才能抑制异化作用的恶性发展。核心就是大幅度提高系统生产力，对以人为中心的生态系统而言，提高农业生产力是生态环境改善和生态系统可持续发展的关键环节。首先改善农田水分状况，在大幅度提高作物单产的基础上，发展以集水技术为基础的生态农业，从而实现农业生态系统的可持续发展。
In view of agroecosystem,the study holds that the main causes resulting in low agricultural productivity and eco environmental deterioration are the weakening of assimilation and strengthening of dissimilation.The processes such as vegetation devastation,soil and water erosion,soil fertility decline and further expansion of cultivated land are actions of dissimilation.The weakening of assimilation is reflected as the decrease of vegetation coverage and ecosystem's productivity.The inhomogeneous changes happened between both processes of assimilation and dissimilation of ecosystems are called “ecosystem inequilibrium”.only the assimilation is effectively strengthened can the deteriorated development of assimilation be controlled.This is the core to the restoration of the ecotone's ecosystem.The raise of the agroecosystem's productivity lies in the substantial improvement of the ecosystem's productivity and the maintenance of ecosystem's sustainability.To this end,it is necessary,first of all,to improve field water holding capacity and increase per unit area yield.And then,based upon this,the development of rainwater harvesting technology oriented ecoagriculture can guarantee the sustainable development of the argoecosystem of the concerned area.
出处
《资源科学》
CSCD
北大核心
1999年第5期25-30,共6页
Resources Science
基金
国家重点基础研究培植项目
国家"九.五"科技攻关项目
教育部重点资助项目
关键词
半干旱地区
农业生产力
生态环境
可持续发展
Semiarid area
Agricultural productivity
Eco environment
Rainwater harvesting technology
Agroecosystem
Sustainable development
