杉木团状造林抚育间伐效益研究

Study on the Benefits of Intermediate Cutting of Chinese Fir Agglomerate Afforestation

通过两次抚育间伐试验,显示16年生杉木团状造林林分(1穴2～4株、每公顷3400～6800株)在生长上与1穴单株式造林(每公顷2500～3000株)存在显著性差异,前者单位面积总蓄积量比后者大27 72%～70 14%,又具有间伐作业设计和施工简单易行,有利于提高林分质量和稳定性,增加间伐材和经济效益的优越性。其中1穴2株式表现最为突出,其单位面积总蓄积量比单株式大57 27%～70 14%,每公顷多获纯利13004～14249元,且在间伐材品质和促进保留木生长、提高主伐材品质和效益上均优于其他处理。

The results of 2 intermediate cutting experiences showed that there existed significant differences in the increments between 16-year-old Chinese fir( Cunninghamia lanceolata )agglomerate afforestation plantation(3 400 ～6 800 per ha)and that planted with hole method(2 500～3 000 per ha).The stock volume of the former was 72%～70. 14%higher compared with that of the latter.The former had the characters of easy in intermediate cutting paning and implementing and beneficial in improving stand quality and stability,increasing the timber yield of intermediate cutting and economic benefits.The pattern of 2 trees in a hole performs the best and the stock volume was 57. 27%～70. 14% higher than the pattern of 1 tree per hole.The net income per hectare was 13 004～14 249 RMB Yuan higher.The agglomerate afforestation was better in the aspects of timber quality of intermediate cutting,promoting the growth of reserve trees and improving the quality and benefits of final cutting timber.