摘要
前言自然和社会经济条件不同,农田生态系统的类型也不同。研究农田生态系统的结构与功能,可了解特定系统对当地环境条件的适应性。近年来,国内外很多学者,都从能流物流和经济效益方面对各类型结构农田生态系统结构与功能作了研究。高畦深沟结构农田生态系统,是珠江三角洲平原区人民为在当地地下水位较高的条件下,进行旱作而发展的一种农田生态系统类型。它的特点是,以一定的比例挖深沟,利用挖沟的泥土起高畦,沟中长期保持有水层,畦面进行旱作,沟里进行种植、养殖或其它利用,结构多年不变,是一种相对稳定的农田生态系统。
This paper studies the structural effect, energy and nutrient flows and economic benefits of 'high bed and low ditch' farmland ecosystem in flood plain areas of the Pearl River Delta. The system can lower underground water level, retain soil deposits, reduce soil erosion and slow down the decomposition rate of organic matter. The economic efficiency and subsidiary energy input are higher in 'high bed and low ditch' farmland ecosystem than in paddy field ecosystem, but the conversion efficiency of subsidiary energy is far lower. The output/input ratio of total energy is rice 10.13>sugar 3.43> banana (Musa sapientum) 2.34>banana(M.nana) 1.63>citrus 0.92. The utilization rate of light energy is sugarcane 1.4606%> rice 0.9326%>citrus 0.7491%> banana (Musa sapientum) 0.5270;b >banana (M.nana) 0.4433%.
出处
《生态学杂志》
CAS
CSCD
北大核心
1989年第3期24-28,52,共6页
Chinese Journal of Ecology
关键词
高畦
深沟
农田生态系统
farmland ecosystem
Pearl River Delta.
