Restriction of Stand Canopy Density on the Growth of Under-forest Natural Broussonetia papyrifera
The investigation and study on the growth of Broussonetia papyrifera stress shelter forest in the gravel mountain of southwest Shandong showed that the average number of trees and branches of Broussonetia papyrifera shrubs increased by 132.95%and-24.50%respectively after two years of flat stubble,which proved that Broussonetia papyrifera shrubs could stimulate stump germination and aggravate the growth stress on the target forest in a short time.When the canopy density is less than 0.75,the coverage of under-forest Broussonetia papyrifera is less than 5%,and the seeds or stubble Broussonetia papyrifera under the forest lose the necessary living environment;When the canopy density is less than 0.3,the coverage of Broussonetia papyrifera is less than 95%,which will cause serious growth stress to the target stand.It is shown that for the target stand with canopy density lower than the critical value(canopy density≤0.3)or the stand with open space in the forest,the purpose of improving the canopy density by artificially promoting natural regeneration or replanting afforestation with original shrub branches can make the low-quality and low-efficiency forest achieve the goal of rapid forest phase transformation.
万方数据
维普
