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英語人>詞典>英漢 : decrease in population的中文,翻譯,解釋,例句
decrease in population的中文,翻譯,解釋,例句

decrease in population

decrease in population的基本解釋
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人口減少

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人口減少
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更多網(wǎng)絡(luò)例句與decrease in population相關(guān)的網(wǎng)絡(luò)例句 [注:此內(nèi)容來源于網(wǎng)絡(luò),僅供參考]

Because of the decline of growth potential and quantitative decrease in population, as well as deficiency in young seedlings, the community of Liriodendron chinense is now at the senescence phase.

從鵝掌楸種群的生勢衰退和數(shù)量削減以及幼齡個體的貧乏來看国产精品久久久久影院色麻豆,目前這個群落已處于發(fā)育過程的衰老階段。

The main achievements of the project are as follows: 1 the hypothesis that a decrease in seed mass causes an increase in mean dispersal distance has been tested based on the experiments of weed dispersal by wind. The experimental results partly support the hypothesis. The results will help farmers to make an optimal strategy of weed control; 2 a statistic method for inferring probabilistic distribution function of a random variable has been developed, by which probabilistic distribution functions of weed species dispersal have been determined; 3 the reproduction structure of Bromus sterilis has been studied; 4 a more complex CA model with 25 neighborhood cells were built, which can simulate spread of a weed population. This work promotes developments in both theory and application of CA models; 5 the "mean law" in weed control has been proposed. Accordingly, the algorism of patch spring may be calibrated; 6 the "patch" and "true patch" have been mathematically defined so that herbicide can be efficiently applied; 7 simulation validates that initial configurations of weed will affect dispersal of its population and strategies of controlling it, or its distribution patterns affect its dispersal progresses.

主要完成的工作和取得的成果有:1)用實驗證實了重量較輕的雜草種子并不一定飛得比較重的遠为爱igao视频网在线观看,其結(jié)果有助于農(nóng)民制訂雜草的優(yōu)化控制策略美女性爱毛片;2)發(fā)展了一種推斷隨機變量分布函數(shù)的統(tǒng)計方法并用它來獲得了幾個雜草種的擴散分布函數(shù);3)對雜草Bromus sterilis的繁殖結(jié)構(gòu)進行了研究欧美视频性一区;4)建立了一個具有25鄰的較復(fù)雜的能模擬雜草擴散的CA模型AAA黄色网址,并在理論和應(yīng)用方面促進了CA模型的發(fā)展;5)在雜草控制方面提出了&平均法則&91视频久久久,據(jù)此可對按塊施藥方法進行校正婷婷五月丁香社;6)精確地定義了&塊&和&真塊&以便在雜草控制中能更有效地使用除草劑;7)模擬證實雜草種群的初始配置影響其擴散和控制策略亚洲国产91精品,或者格局影響過程免费网站看a级来。

The results showed that: 1 The survival curve of the population conformed to the type of Deevey-Ⅲ; 2 With an increase in the population mortality ratio and a decrease in the survival rate, the mortality ratio greatly increased in ages 0-40 years, reaching 89.7%; 3 There existed two peaks of mortality in the lifespan, one was from seedlings to young trees (0-40 years) and the other in the adult stage (180 years).

結(jié)果表明:1岷江上游林線地段岷江冷杉種群存活曲線趨於Deevey-Ⅲ型。2林線地段岷江冷杉種群生存率呈單調(diào)下降趨勢国产精品PORNY九色,生存率下降趨勢前期高於后期亚洲人妻无码专区,說明岷江冷杉種群幼苗死亡率高,種群后期比較穩(wěn)定婷婷色在线观看网站。3林線地段岷江冷杉林整個生長期中出現(xiàn)了兩個死亡高峰期黄色对白视频,一個出現(xiàn)在幼苗向幼樹過渡時期(0~40年),另一個出現(xiàn)在中齡時期(180年)可以免费看黄的网页。