By thinking of the geo-environment problems caused by the decrease of water level, inthe future the extraction rate of groundwater source plants should be reduced by at least30% of the rate in 2000.
考虑到不至于由于地下水位下降而引发各种环境地质问题，北京主要地下水供水源地今后应至少降低2000 年开采量的30%进行地下水开采。
The photosynthetic rate of the leaves declined with the decrease of soil water potential, but drought-resistant varieties reduced less than drought-sensitive ones.
叶片光合速率随土水势的下降而减小，抗旱性品种减小的幅度小于抗旱性较差的品种。
Following the elevating of saved amount of water withdrawal the saved amount of water consumption increases gradually but the increase rate tends to be reduced.
随着取用水节水量的提高，耗水节水量也逐渐增加，但增加幅度越来越小，最后趋近于零。
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