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.
出处
《蚕业科学》
CAS
CSCD
1989年第1期1-6,共6页
ACTA SERICOLOGICA SINICA
关键词
桑树
群体结构
桑园产叶量
Mulberry Stand structure Dry matter production
