[Calculation method of ecological water requirement for forestland and its application to Huang-Huai-Hai region].
The evapotranspiration and soil moisture content of forestland were studied in relation to free growth. It was found that when the soil moisture content was about 45-100% of field capacity and the actual evapotranspiration came up to 60-100% of potential evapotranspiration, the growth of trees could be sustained. On the basis of our research, the grading standard and calculation method of ecological water requirement of forestland were established. Moreover, the ecological water requirement for forestland in Huang-Huai-Hai are was estimated by GIS technology, and its ecological water shortage was compared to its current water consumption. The results indicated of that the annual ecological water requirement of forestland in Huang-Huai-Hai region was 25.6-45.8 billion m3, and its current water consumption was approximately 2.8 billion m3 below the minimum of ecological water requirement, and 8.4 billion m3 below the optimal ecological water requirement.
Zhang
Yuan
Y
Institute of Environmental Sciences, State Joint Key Laboratory of Environment Simulation and Pollution Control, Key Laboratory for Water and Sediment Sciences of Ministry of Education, Beijing Normal University. zhangsongming@263.net
Yang
Zhifeng
Z
D002681:China; D004463:Ecology; D012987:Soil; D014197:Trees / Q000502:physiology*; D014867:Water; D014881:Water Supply
D012987:Soil; D014867:Water