摘要
从树木生长强度与土壤水分含量、蒸散量的相互关系出发 ,提出了林地生态需水量的等级标准和计算方法 ,并以黄淮海地区为例 ,采用ＧＩＳ技术对该地区林地生态需水量进行了估算 ,分析了该地区林地在现状用水状况下的生态缺水量 .结果表明 ,该地区林地年生态需水量约 2 . 56× 1 0 1 0 ～ 4. 58× 1 0 1 0 ｍ3,在满足最小生态需水量要求下林地缺水量约为 2 .8× 1 0 9ｍ3,在满足适宜性生态需水要求下林地缺水量约为8.4× 1 0 9ｍ3.
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 area 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 m 3,and its current water consumption was approximately 2.8 billion m 3 below the minimum of ecological water requirement,and 8.4 billion m 3 below the optimal ecological water requirement.
出处
《应用生态学报》
CAS
CSCD
2002年第12期1566-1570,共5页
Chinese Journal of Applied Ecology
基金
国家重点基础研究发展规划资助项目 (G19990 43 60 5 )
关键词
林地
生态需水量
计算方法
应用
蒸散
土壤水分
黄淮海地区
Forestland, Ecological water requirement, Evapotranspiration, Soil moisture content, Huang Huai Hai region.
