Shannon-Wiener diversity index, Simpson diversity index and evenness index all show similar trend of change. The diversity indexes and evenness index of zoobenthos in rice-duck farming ecosystems are higher than those in normal paddy during the early stage of rice growth, but are in the reverse trend during the later stage.

水稻各生育時期常規(guī)稻田和稻鴨共作稻田底棲動物的Shannon-Wiener多樣性指數(shù)、Simpson多樣性指數(shù)和Pielou均勻度指數(shù)變化趨勢相似国产系列熟女丝袜喷水，均為水稻生育前期稻鴨共作稻田的生物多樣性指數(shù)和均勻度指數(shù)高于常規(guī)稻田一级毛片精久久久久久久，而后期低于常規(guī)稻田。

The total number of zoobenthos in rice-duck farming ecosystem declines remarkably during the early stage of rice growth, but almost equals that of conventional paddy at late growth stage.

水稻生育前期一级毛片免费视频，稻鴨共作使底棲動物的個體總數(shù)減少較大美女b网站，后期與常規(guī)稻田差異較小。

Appeared in West Lake after exchanging lake water. The dredging sediment had a negative effect on standing crop of zoobenthos community and dominant species, among which, standing crop of tubificid species declined markedly.

西湖底棲動物的群落結(jié)構(gòu)在生態(tài)治理工程后變化較小欧美a级v片一区二区，換水后有外來種類貽貝和寡鰓齒吻沙蠶出現(xiàn)一级黄色视频免费网站，群落結(jié)構(gòu)仍然是以富營養(yǎng)化種類為主且缺乏軟體動物。