桑树群体结构的研究 Ⅳ.群体结构与物质生产  

STUDIES ON THE STAND STRUCTURE OF MULBERRY TREES Ⅳ. Relationships Between Stand Structure and Dry Matter Production

作　　者：龚垒[1] 任德基 

机构地区：[1]中国农业科学院蚕业研究所

出　　处：《蚕业科学》1989年第1期1-6,共6页ACTA SERICOLOGICA SINICA

摘　　要：不同密度新一之濑桑园,栽植后头5年内,桑叶产量变动在306.4—2625.6公斤·亩^(-1)·年^(-1)之间,净初级生产力变动在8—16吨·公顷^(-1)·年^(-1)之间,收获指数在0.3—0.6之间,光能利用率在0.3—0.7％(以年为基础)和0.4—1％(以生长季节为基础)之间。密植和推迟开剪年份能增加桑叶产量和提高桑园的净初级生产力及光能利用率。密植会降低收获指数,而提早开剪则有增加收获指数的倾向。The leaf yields of mulberry fields (New Ichinose) in the first five years after being planted varied between 306.4 and 2625.6kg mu-1 yr-1.the net primary productivities (NPP)varied from 6 to 16 tons ha-1 yr-1, the harvest index (HI) varied from 0.3 to 0.6, and the efficiency(e) of the conversion of radiant energy to chemical energy by the stands varied between 0.3 and 0.7 per cent (on the basis of whole year) and 0.4 and 1 per cent (on the basis of growing season) with various planting densities. Incresing of planting densities and delaying of the pruning year can raise NPP and ε of mulberry stands. Increasing of planting densities will decrease HI? however, there is the tendency of an increasing HI while the prunin; year is shifted to an earlier date.

关 键 词：桑树 群体结构 桑园产叶量 

分 类 号：S888.4[农业科学—特种经济动物饲养]