Study On Effects Of Tending Of Secondary Forest In Jiangle Forest Farm

This paper takes secondary forest in Fujian Jiangle forest farm as the research object. Organize forest management types groups and management types with the control index of regional ecological importance and ecological sensitivity, design management measures for every management types, especially for tending measure. Analyze the effect of different tending intensity changes from the growth and stand structure in the tree to provide a reasonable theoretical and method basis for determining tending intensity of Jiangle farm secondary forest. The main conclusions are as follows:(1) Organise Jiangle forest farm secondary forest as protective management type group and intensive management type group. Organise katus the soil and water conversation forest type in the protective management type group, its management measures include tending, stand improvement, close hillsides to facilitate afforestaion and regeneration cutting. Cutting and pruning in the young forest and middle age forest, design 10%,20% and 35% tending intensity and control group. Organise fir large diameter timber forest type in the intensive management type group, its management measures include tending tending, stand improvement and selective cutting. Cutting and pruning in the young forest and middle age forest, design 10%,20% and 35% tending intensity and control group.(2) In katus the soil and water conversation forest, the 20% intensity tending tending has the best effect on promoting forest growth, meanwhile, retain canopy density is 0.65, diameter structure is close toinverted "J’ type, the objective tree aggregation decreases and closes to uniform distribution. In the young soil and water conversation forest, the net profit of tending tending is 32 yuan/hm2, the stand volume percentage of objective trees number is 33%. In the middle age soil and water conversation forest, the net profit of tending tending can be 3114 yuan/hm2, the stand volume percentage of objective trees number is 44.15%.In the young fir large diameter timber forest, the effect of tending tending is best when the intensity is 35%. The best promotion of forest growth, the net profit is 1320 yuan/hm2, retain canopy density is 0.6, the stand volume percentage of objective trees number is 39.62%, diameter structure is close to normal distribution, the stand was moderate misture, the objective trees are in the mean state. In the middle age large diameter timber forest, the effect of tending tending is best when the intensity is 20%. The good promotion of forest growth, the net profit is 7580 yuan/hm2, retain canopy density is 0.65, the stand volume percentage of objective trees number is 33.72%, diameter structure is close to normal distribution, the stand is close to moderate misture, the objective trees are in the mean state.