北方沙地农业生态系统能流分析与评价──以吉林省乌兰图嘎镇为例  

作　　者：乌兰图雅[1] 

机构地区：[1]中国科学院地理研究所资源与环境信息系统国家重点实验室,北京100101

出　　处：《国土与自然资源研究》1998年第3期44-48,共5页Territory & Natural Resources Study

摘　　要：采用系统能流分析方法.对吉林省乌兰图嘎沙地农业生态系统进行了分析和评价。结果表明；系统能量输出远大于输入．这是系统失调、引起土地沙漠化的直接原因．能量有效转化率不高、“有效输出”低、使得系统自然生产力得不到充分发挥．系统结构简单．系统自我调节、自我维持能力差。Analysis and assessment of sands agriecological system in Wulan Tuga. Jinn Province are made by the method of system energy flow. The results indicate that: input of system energy is much more than the output. which is the direct reason of system disorder and land desertification; and the natural productive force of system could not be fully implemented for low effective rate of transformation and low effective output and that the structure of system is simple. and the ability of self-adjustment and self-maintenance is weak as tved.

关 键 词：农业 生态系统 沙地 能流分析 

分 类 号：S181[农业科学—农业基础科学] F323.22[经济管理—产业经济]