【摘要】 通过对农田防护林林分生长过程和林况变化过程的分析 ,得到了林分后期经济效益和防护效益的变化过程 ,然后根据农田防护林经营的目的 ,提出其合适的更新采伐时间 ,这种通过林况反映效益变化的方法在实践中具有一定的可行性。更多还原

【Abstract】 There is no quick way to determine the regeneration cutting age of the shelter belt, which is a problem to be solved urgently in the protection forest management. Based on the analysis of transformation of the forest growth and forest quality in Nongan County, Jilin Province, the authors pointed out the transformation of the economic benefit and protective benefit in the old forest, put forward a proper regeneration cutting age of the shelter belt.更多还原