ZHANG Yuan. Minimum Ecological Water Requirement of Forestland in Huang-huai-hai Area[J]. 2002, 16(2): 72-75.DOI：
黄淮海地区林地最小生态需水量研究
摘要
以黄淮海地区为例
对林地最小生态需水量的理论和方法进行探讨
研究内容主要包括 :(1 )从林地生态系统水量平衡关系出发
分析林地生态需水的各种表现形式
并对林地生态需水量概念进行界定 ;(2 )提出林地最小生态需水量的计算方法
对其中的土壤最小含水定额和最小蒸散定额进行理论探讨 ;(3)按照区域生态环境保护目标的要求
对黄淮海地区的林地合理面积进行规划 ;(4 )根据规划结果
在 GIS支持下计算研究区的林地最小生态需水量。研究表明
黄淮海地区的林地合理面积为 7.80万 km2
占总面积的 1 8.85 %
其每年所需的最小水量为 6 0 7亿 m3
其中
林地蒸散需水大约为 4 83亿 m3
土壤含水需要 1 2 5亿 m
Abstract
We propose to study the water required by forestland in the north area of China
which includes the evapotranpiration and soil moisture contents. It is found that when the soil moisture content is below 45% of field capacity of soil and actual evapotranspiration is below 60% of potential evapotranspiration
the growth of trees cannot be sustained. On the basis of our research
we establish the computing method of minimum ecological water requirement of forestland
and take the 45% of field capacity of soil as minimum soil moisture quota of forestland
60% of potential evapotranspiration as the minimum evapotranspiration quota. The minimum ecological water requirement of forestland of Huang huai hai area is estimated as an example on the basis of the rational area of forestland planned with GIS. The results indicate that the rational area of forestland of Huang huai hai area is 78 thousand km 2
proximately the 18.85% of total area
and the minimum water requirement is about 60.7 billion m 3
48.3 billion m 3 for evapotranspiration and 12.5 billion m 3 for soil moisture contents.
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