中文摘要：

通过分析湿地的水文情势与湿地生物群落的空间分布及演替，提出在确定湿地的中心区及活动区的基础上计算湿地最小生态需水及适宜生态需水的计算方法。并以扎龙湿地为例，通过ArcGis9．0对DEM数据插值计算，利用1956-2000年45年月降水蒸发资料及遥感影像解译资料，得出扎龙湿地最小生态需水量为1．06亿m^3，估算出适宜生态需水量为2．34亿m^3。这对于扎龙湿地的生态安全管理具有重要参考意义。

英文摘要：

Wetlands have vast environmental benefit and many ecological functions. With the social-economic development, wetlands are under threat from human-induced changes to their hydrology. To alleviate these threats, restore wetlands degraded and enhance biodiversity, it is very necessary to study the ecological water demand in wetlands. This paper analyzed the relationship between water regime and ecosystem, and then brought forward the calculating method of ecological water demand. From the point of view of the whole, this paper uses GIS software, some vectot＇s terrain information,and hydrological datum to accomplish the purpose in Zha Long Wetland. The minimum and proper ecological water demand volume is respectively 0. 106 and 0. 234 billion cubic meters with mean annual hydrological datum.