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生态学杂志 ›› 1988, Vol. ›› Issue (6): 1-6,11.

• 研究报告 •    下一篇

南亚热带地区农业生态系统的能流分析

连玉武   

  1. 厦门大学生物系
  • 收稿日期:1988-03-21 修回日期:1988-06-17 出版日期:1988-12-10

Analysis of Energy Flow in Agroecosystems of South Subtropical Area of China

Lian Yuwu   

  1. Department of Biology, Xiamen University
  • Received:1988-03-21 Revised:1988-06-17 Online:1988-12-10

关键词: 污泥, 土地利用, 作物, 土壤, 环境影响

Abstract: The utilization of energy in agroecosystems of south subtropical Tongan county in Fujian province was investigated and analysed. Three subecosystems were included: crop, orchard and forest, and livestock subsystem. The results showed that: (1) The total amount of solar radiation in these ecosystems was 4.396?1016J, of which,5.07?1015Jwas in cultivated land and 3.62?1016Jin hilly region. (2) The utilization efficiency of solar energy was 2.86% for sugarcane and under 1% for other crops. (3) In total energy investment to cropland, the organic energy input took part of 81%, which was averagely 4.49 times as much as inorganic energy invested. (4) The relationship between output/input ratio and organic energy/inorganic energy ratio was that of a quadratic parabola.

Key words: Sewage sludge, Land utilization, Crop, Soil, Environmental impact