生态农业研究2000，Vol.8Issue(1)：38,1.
亚热带丘岗区生态系统水分平衡及农业反应
Water equilibrium in subtropical hilly ecosystems and its impacts on agr iculture
摘要
Abstract
Field observations for ten years were carried out in a catchment basin-basic ecological unit to investigate the natures of water equi librium. This unit had been selected as the representative ecosystem of subtropi cal hilly land of South China. Obtained data include the annual variation and d istribution of the rainfalls, evaporation and run off, and irrigation requiremen t in the ecosystem. The results showed that the amount of rainfalls was abundant and able to maintain water equilibrium in the ecosystem. However, the distribut ion of rainfall varied largely in a year. During the rain season(late March to J u ne),the amount of rainfalls was much greater than evaporation(including plant co nsumption), which resulted in water logging.In contrast,during the period from l ate July to late September, the amount of rainfalls was smaller than half of eva poratioin. Over this period, water deficiency dominated the water ecology of the system and resulted in dry environment. With such water environment, crop produ ctions in the subtropical hilly regions suffer seriously from both impacts of water l ogging and drought.Based on the water characteristics in the subtropical hilly e cosystems, the main effort for arising crop production is to reduce harms from both of water logging and drought. The countermeasures are to strenghen the con struction of farmland(engineering and agronomical method) and to improve water m anagement, in order to control water-logging and best use water resource.关键词
亚热带/丘岗区生态系统/水分平衡/农业反应Key words
Subtropical zone/Hilly land ecosystems引用本文复制引用
谢小立,王凯荣,周卫军,童成立..亚热带丘岗区生态系统水分平衡及农业反应[J].生态农业研究,2000,8(1):38,1.基金项目
“九五”中国科学院重大项目(KZ951-A1-301)和特别支持项目 （KZ951-A1-301）
