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21.Studies by Hargrave and Geen estimated natural community graz-ing rates by measuring feeding rates of individual zooplankton species in the laboratory and then computing community grazing rates for field conditions using the known population density of grazers.
由哈格雷夫和吉恩所进行的研究,对自然条件下的群落食草比例进行了估计,其手段是通过测量出实验室内单独的浮游动物种类的结食比例,然后利用已知的食草动物种群密度,计算出实地状况下的群落食草比例。
22.In the periods of peak zooplankton abundance,that is,in the late spring and in the summer, Haney recorded maximum daily com-munity grazing rates,for nutrient-poor lakes and bog lakes,respectively,of 6.6 percent and 114 percent of daily phytoplankton production.
在浮游动物数量激增的高峰期,亦即在春季后期以及夏季,哈尼记录了最大程度上的每日群落食草比率,对于营养物不充足的湖和沼泽湖而言,分别为每日浮游植物繁殖量的6.6%和114%.
23.The hydrologic cycle,a major topic in this science,is the complete cycle of phenomena through which water passes,beginning as atmospheric water vapor,passing into liquid and solid form as precipitation,thence along and into the ground surface,and finally again returning to the form of atmospheric water vapor by means of evaporation and transpiration.
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