中国农业科学（英文版）2005，Vol.4Issue(1)：34-40,7.
The Dynamics and Driving Force of Farmland Ecosystem Productivity
The Dynamics and Driving Force of Farmland Ecosystem Productivity
摘要
Abstract
Based on the experimental data of crop yield, soil water and fertility of a dryland farming ecosystem in northwest China, a systematic analysis is carried out to study the dynamics of dryland farming ecosystem productivity and its limiting factors. This paper also discusses which of the two limiting factors, i.e., soil water or fertility, is the primary factor and their dynamics. The result shows that fertility is the primary limiting factor when the productivity is rather low. As chemical fertilizer input increases and the productivity promotes, water gradually becomes the primary limiting factor. Chemical fertilizers and plastic film mulching are the two major driving forces that determine the crop productivity and its stability in these areas.关键词
Farmland ecosystem/Productivity/Limiting factors/Dynamics/Driving forceKey words
Farmland ecosystem/Productivity/Limiting factors/Dynamics/Driving force引用本文复制引用
ZHONG Liang-ping,SHAO Ming-an,LI Yu-shan..The Dynamics and Driving Force of Farmland Ecosystem Productivity[J].中国农业科学（英文版）,2005,4(1):34-40,7.基金项目
This study was supported by the National Natural Science Foundation of China(90102012), and the Chinese Ecosystem Research Network(2001BA508B18). （90102012）
