喀左县农业生态系统能流的研究

本文根据辽宁省西部一个典型具(喀左县)农业生态系统的调查,分析该系统八十年代初期基本特征,进而提出改善该农业生态系统的措施。 整个系统由七个组分(或亚系统)组成(农田、牲畜、果园、人工林、人工草地、天然灌丛草地、当地居民)。作者根据有关统计数据和调查资料估算出该系统1981—1983年期间年平均流量,其中包括流入和流出能量以及系统内各组分之间的能流量。最后讨论了调整畜牧业结构,提高工业能量、生物质能量利用率和林分改造等问题。

STUDY ON ENERGY FLOWS THROUGH AN AGROECOSYSTEM IN WESTERN LIAONING PROVINCE

The impacts of increased human activities in the last two hundred years have seriously damaged the semi-arid and semi-humid ecosystems of western Liaoning in China. Frequent droughts and heavy soil erosion are the major obstructions of agricultural development in the area. The energy flows through an agroecosystem in rural area of Kazhou county, a typical one in western Liaoning province, have been studied to learn some basic characteristics of the agroecosystem and to find some strategies for improving it. The system covers seven subsystems: cropping fields, orchards, tree plantations, artificial grass lands, natural shrubbery-grass pastures, domestic animals, and local residents. The annual average energy flows through the agroecosystem, including input and output energy flows and the energy flows between the components, were calculated and estimated for the period of 1981-1983. Based on analysis, some strategies for improving the agroecosystem were recommended,such as reducing pork production and developing dry-land farming techniques to improve food supply to local residents, developing fuelwood plantation to improve local household fuel supply, and developing intensive orchards to increase commercial outputs.