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standing crops中文是什么意思

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用"standing crops"造句"standing crops"怎么读"standing crops" in a sentence

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  • 现存量

例句与用法

  • Standing crop biomass
    现存作物量
  • Standing crop the total weight of all the living organisms present in an ecosystem at a given moment , usually expressed as dry weight per unit area
    现存量:某一给定时刻,生态系统中所有活的有机体的总重量。通常的表述是单位区域的干重。
  • 4 . the community structure and standing crops of periphyton in chinese reservoir were first reported . thirty - five genra of periphytic algae were collected using hanging plastic slices
    8 .青梢帕culter由bryi鳞片的年轮从4月份开始形成,大部分年轮形成时间在7月。
  • For the relationships between zoobenthos and environmental factors , results showed that zoobenthic standing crops were positively correlated with submersed aquatic macrophytes , total phosphorus and total nitrogen contents but were negatively correlated with depths and secchi disk transparencies
    环境分析表明底栖动物总的现存量与水草生物量、总磷总氮含量均正相关,与水深、透明度均负相关。
  • There were few reports about zoobenthic functional feeding groups in china so far , a detailed study of functional feeding groups species numbers , species percentages and standing crops in four lakes was done . results showed that functional feeding groups in the four lakes had their own characteristics . shredder percentage was highest in longgan lake than other three lakes
    结果表明各个湖泊中功能摄食类群各有其特点,撕食者的比例以龙感湖最高,收集者的比例以黄湖最高,刮食者的比例以牛山湖最高,捕食者的比例以东汤孙湖最高。
  • To examine the effects of different lake uses on lacustrine zoobenthic community , zoobenthos were sampled in 1998 - 1999 from four shallow lakes of middle and lower basins of changjiang river , viz . fish stocking and touring lake , east tangsun lake ; fish - stocking - lake , niushan lake ; natural - fishing - lake , longgan lake and crab - overstocking - lake , huang lake . species composition , standing crops , functional feeding groups of benthic animals in every lake were studied
    1998年4月1999年7月对长江中下游四个浅水湖泊即东汤孙湖、牛山湖、龙感湖和黄湖的底栖动物分别进行了四次采集,研究各个湖泊底栖动物在种类组成、现存量、功能摄食类群、生产显和渔产潜力上的差异;结合各个湖泊理化生物因子综合分析了湖泊不同利用方式对底栖动物群落的影响。
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