不同用途毛竹林的施肥研究——Ⅰ.毛竹材用林的施肥*

前言 林木生长所必需的养分主要来源于:土壤的矿化作用,大气的干湿沉降,凋落物和土壤动物、微生物的反馈,施肥及林木器官组织间的养分转让等五个主要方面。其中唯一可以比较容易地受人为控制的因素是施肥。毛竹林由于每年或每度(二年)的采伐,林地将损失大量养分元素。因此通过施肥及时补充毛竹生长所需的营养元素是获得毛竹林丰产、稳产的必要措施之一。

FERTILIZATION STUDIES IN BAMBOO STANDS WITH DIFFERENT END USES I.FOR BAMBOO TIMBER STAND

Totally 40 plots have been laid out at three experiment sites located in the main Phyllostachys pubescent production area of China, where the productivity of plot before treated is obtained through uniformity trial, based on which the proper plot area is determined as 400m².According to the orthogonal design, three factors with two levels for each, i.e.A.fertilizer dosage (375 kg·ha^-1, 750kg·ha^-1);B.fertilizer applying time (Spring:one month before shooting, Autumn:shoot/bud differentiation stage);C.fertilization method (in furrow, in stump), have been combined for searching the best combination.In all sites, N P K Si compound commercial fertilizer is adopted, the propotion of which is N:P:K:Si=2:1:0.5:0.5.The results have shown that the best one is in spring, one month before shooting, to apply 375 kg·ha^-1 in furrow with a depth of 20cm, which can increase culm yield by 7282.50kg or a net income of RMB 832.20 Yuan compared with the control.