林分结构、立地条件和经营措施对竹林生产力的影响

Effect of stand Structure,Site Condition and Management Method on the Productivity of Bamboo Stands

１９８５～１９９１年对江西分宜县江下林场的毛竹林定位实验结果表明：竹林应在饱和立竹度条件下进行生产循环；影响产量的因子主要是土壤厚度、腐殖质层厚度、土壤全Ｐ和紧实度，证明采取松土施肥等抚育措施能显著增产；江下毛竹林５个立地等级的合理经营密度依次为４９５０～５５５０、４３５０～４８００、３４５０～４２００、２４００～３３００、１８００～２２５０株／ｈｍ２；施用尿素２２５ｋｇ／ｈｍ２的增产效应依立地条件和林分状况分别为２０％～１００％，增值效益为２２％～８１％。

Successive surveys were made in bamboo(Phyllostachys pubescens)groves inDagangshan region,Jiangxi Province from 1985 to 1991. Based on those data,the factors toaffect yield such as stand structure,site condition and management method and their adjust-ing method were discussed.The results show that the most important factor was stand densi-ty which should be maintained in optimum situation,The optimum density of bamboo grovein the Jiangxia Forest Farm varied with the site condition and has been given as follows :4 950～5 550(1):4350～4800(2)、3 450～4 200(3)、2 400～3 300(4)、1 800～2 250(5)stems/hm2 respectively,Main site factors affecting productivity are soil and humus thickness,soil tightness and P content of soil.Fertilization can bring up a good output and high econom-ic benefit,the increment in yield is 20%～100%and the increment is 22%～81%with thechanges of the site conditions,so it should be used in suitable areas.