辽河平原商品粮基地农业生态系统初级生产力影响因素分析

一、引言生产力是评价农业生态系统的重要特性之一。农作物单产一般可代表农业生态系统的初级生产力,它的形成是自然、经济、技术因素综合作用的结果。作物生产力除了受品种的生理遗传特性影响外,还受环境资源(光、热、水分和养分)、集约化水平及灾害性

Analysis of Factors Influencing Primary Productivity of Agroecosystems in Marketable Grain Base of Liaohe Plain.

The formation of crop productivity is influenced by various factors such as natural, economic and social factors. In this paper, simple correlation analysis, partial analysis and path analysis are applied to deal with the effect of different factors, e.g., environmental resource, agricultural intensification level and natural disasters on the primary productivity of agroecosystems in marketable grain base of Liaohe plain, The results show that fertilizer and power energy are key constraints after precipitation and solar illumination. Moreover the areas of middle and low yielding fields are also of importance for the improvement of crop productivity.