crown density

基本解釋

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.
對等密度107楊幼齡林進(jìn)行一次性施肥灌溉措施對比試驗(yàn)，結(jié)果表明，一次性水肥措施對其幼林未郁閉前各齡期胸徑生長量和郁閉度均有促進(jìn)作用。