In this paper, the environmental water demand in the upstream of Hanjiang River is studied.
对汉江上游的生态环境需水量进行了初步探讨。
The environmental water demand is considered for scientific disposition and management and ecologic equilibrium.
必须合理预留生态环境需水，以实现水资源的科学配置和有效管理，维持生态平衡。
Then the index system of eco-environmental water demand has been established by three different methods step by step.
借助频度统计、理论分析、专家咨询三种方法来筛选建立区域生态环境需水的评价指标体系；
Results showed that, the environmental water demand almost linearly increased with the pollution loading, and exponentially increased with the pollutant concentration of the supplemental water.
结果表明，随着污染负荷和补水本底污染物浓度的增加，环境需水量分别成近似线性和指数函数增加；
The paper puts forward and calculates the lowest environmental water demand in river course of stem stream according to the features of ecosystem and environment of lower reach of Yangtze River.
依据长江下游生态环境特点提出并概算了长江下游干流河道内最小环境需水量。
BOD (biochemical oxygen demand) is an important index to evaluate the quality of water in environmental monitoring and sewage treatment.
即生化需氧量，是环境监测与污水处理中评价水质的一项重要指标。
It also studies the relationship between the daily water demand of the overlapping vegetation and other environmental factors as well as vegetation physiological factors.
同时分析逐日重叠植被需水量与各环境因子及植被生理因子的关系。
Under the constant condition of environmental load, water consumption of ten thousand Yuan output value is got from the control equation. It is unable to meet the recycling economy's demand.
在环境负荷不变条件下，运用控制方程求得的万元产值用水量无法满足循环经济的需求。
Under the constant condition of environmental load, water consumption of ten thousand Yuan output value is got from the control equation. It is unable to meet the recycling economy's demand.
在环境负荷不变条件下，运用控制方程求得的万元产值用水量无法满足循环经济的需求。
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