種群衰落 的英文怎麼說
中文拼音 [zhǒngqúnshuāilà]
種群衰落
英文
population decline-
And through leslie matrix analysis, we deduced, except of the subpopulation at altitude 490m, the subpopulations of lilium tsingtauense will not die out if not been disturbed badly. we estimated the growth ability and resistance ability of both metapopulation and local population by use the method of quamitative analysis for population structura1 dynamics. the growth ability order is population l > population 2 > population 3 > population 5 > population 6 > metapopulation > population 4
川叩iqu n了e ）復合種群研究摘要從種群年齡結構的穩定、衰退、增長概念出發，以種群結構參數為依據，運用加權法與條件概率乘法法則，定量椎導出衡量種群年齡結構及群落結構的動態指數，該方法克服了過去在植物種群結構動態比較評價中粗放的等級歸類劃分的缺陷，並能解決結構動態定量比較評價問題，因而認為有普遍使用的價值。The results showed that the temporal dynamics of predatory natural enemy community in cotton fields could be classified into seven types and the change of the community could he divided into three major stages of formation and development period ( in the vegetative growth stage of cotton ), great prosperity period ( in the vegetative and reproductive growth stage of cotton ) and decline period ( in the reproductive growth stage of cotton )
結果表明，棉田捕食性天敵群落的時序動態可以分為7種類型；演變可以分為形成和發展階段（棉花營養生長期） 、鼎盛階段（棉花營養生長和生殖生長並進期） 、衰退階段（棉花生殖生長期） 3個主要階段。Gradually, with the more and more transpiration of the vegetation, and with the reduction of the deep soil moisture, in the end, a kind of balance of soil moisture will appeared and be kept for ever between the precipitation and the transpiration of vegetation, and the manual sand - fixing vegetation will be transformed consequently into its natural climax stage completely, in which the dominant plant is leymus secalimus, and in which the plant species richness is not too low, but the plant species evenness is the lowest
設置機械沙障和生物沙障的初期，植物的物種豐富度、物種均勻度會有一個暫時的提高；但是在人工固沙植被的發育盛期，物種豐富度會降低；隨植物群落蒸騰耗水量的不斷增大，人工植被不斷地衰退，最後發展到賴草土壤頂極群落，此時的物種豐富度並不低，但是物種均勻度很低。
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