太行山浅山区农业生态系统几个问题的分析

Analysis of an Agroecosystem in Low Mountain District of Taihang

本文应用系统分析方法,对太行山浅山区一个典型的农业生态系统—唐县明伏村进行了定量研究。研究表明,农田系统能量转化效率低,肥料布局不合理,氮素过量盈余,生态系统严重超载。由于人口增长与建房占地,第二性生产一直受制于耕地生产力,农业经济在资源环境限制下发展缓慢。本文指出,重视旱地作物生产,促进草食食物链过程,推动剩余劳动力的转移是提高系统承载能力,减轻环境压力的有效途径。

A typical agroecosystem-Mingfu Village in low mountain districtof Hebei was studied with the systems analysis.Results showed that thesystem got more input energy but run in low efficiency.There is overplusof N in soil because of its irrational distribution between the watering landand the dry land.The ecosystem has tow population carrying capacity andhas been overloaded.The simulation to the ecosystem with DYNOMO modelshowed that on the condition of population increasing at the present rate,the secondary production in the system was always determined by the grainproductivity of land and the agroeconomics of the system would developslowly.