不同立地杉木人工林长期生产力分析

Analysis of the Long-term Productivity of Chinese Fir Plantations in Different Sites

对不同立地杉木人工林长期生产力差异进行研究,应用黎平县第四次森林资源调查数据,统计分析了不同海拔、坡向、坡位和龄组的杉木人工林单位蓄积量,结果表明:全县杉木人工林单位蓄积量为126.9 m^3/hm^2,海拔800m以下人工林最高单位蓄积量为130.0m^3/hm^2;无坡向的杉木人工林单位蓄积量最高为137.7m^3/hm^2,其次是西坡132.0m^3/hm 2,东北坡最低120.0m^3/hm 2,西南坡与北坡、西北坡的单位蓄积量接近,东坡和南坡也接近;平地单位蓄积量最高为142.7m^3/hm^2,山脊最低为110.0 m^3/hm^2;阴坡和半阴坡的幼龄林和中龄林以及海拔<1000m的近熟林、成熟林、过熟林,其单位蓄积量均大于阳坡和半阳,而海拔≥1000m的近熟林、成熟林、过熟林则相反。不同立地杉木人工林生产力差异大,杉木中心产区人工林以800m以下、阴坡和半阴坡、坡中下部的长期生产力最高,阴坡和半阴坡高于阳坡和半阳坡。

The long-term productivity difference of Chinese fir plantation in different sites was studied.Based on the result of the fourth forest resources planning-inventory survey in Liping County,the unit stock volume of Chinese fir plantation in different altitude,aspect and position of slope and age groups were analyzed.The results showed that the unit stock volume of Chinese fir plantation in the whole county was 126.9 m^3/hm^2,and the maximum unit stock volume of Chinese fir plantation was 130.0 m^3/hm^2 in the sites below the elevation of 800 m;The maximum unit stock volume of Chinese fir plantation without slope was 137.7m^3/hm^2,the second was 132.0m^3/hm^2 in the west slope,the lowest was 120.0m^3/hm^2 in the northeast slope,the unit stock volume of the southwest slope was close to that of the north slope and the northwest slope,the east slope and the south slope were also close;The maximum unit stock volume of the flat land was 142.7m^3/hm^2,the lowest was 110.0m^3/hm^2 in the ridge;The unit stock volume of young and medium-aged forests on the shady and semi shady slopes and the near mature,mature and over mature forests with an altitude of less than 1000m were higher than that on the sunny slopes and semi sunny slopes,while that of the near mature,mature and over mature forests with an altitude of more than 1000m was the opposite.The long-term productivity of Chinese Fir Plantation varies greatly in different sites.The long-term productivity of Chinese Fir Plantation in the sites below the elevation of 800m,on the shady and semi shady slopes,and on the middle and lower parts of the slopes of the central production area was the highest,and on the shady slope and semi shady slope was higher than that on the sunny slope and semi sunny slope.