crown density

常見例句

Setting up alluring tree should be on sides of ventilative and sunny forest road or in forest windows with a less crown density.
是采取誘殺措施的重要時(shí)期；誘餌樹的設(shè)置應(yīng)以通風(fēng)向陽(yáng)的林道旁或郁閉度較小林分的林窗中為宜，距寄主植物有一定距離的林緣更佳。
Forest structure, individual quality, tree density and crown density, and structure and function of brush forest are used to construct a criterion to the LQBF.
判定低質(zhì)低效林的依據(jù)是林分的結(jié)構(gòu)、林木個(gè)體質(zhì)量、密度和郁閉度、灌木林結(jié)構(gòu)和功能。
Comparative experiments was conducted on the effect of one-time irrigation and fertilization on the DBH and crown density of young 107 poplar plantations of even planting density.
對(duì)等密度107楊幼齡林進(jìn)行一次性施肥灌溉措施對(duì)比試驗(yàn)，結(jié)果表明，一次性水肥措施對(duì)其幼林未郁閉前各齡期胸徑生長(zhǎng)量和郁閉度均有促進(jìn)作用。