基本解釋林冠疏密度英漢例句雙語(yǔ)例句The species component, density and index of crown cover in the tree layer effect on distribution of illumination and under plants in the plant community.群落中光照的分佈狀況受喬木層的種類(lèi)組成、密度與冠幅指數(shù)等因子的影響，且對(duì)下層植物分佈有較大的作用。density of crown cover更多例句專(zhuān)業(yè)釋義辳業(yè)科學(xué)樹(shù)冠疎密度