密度调控对马尾松人工林生态系统碳储量的影响

Effects of Density Regulation on Carbon Storage of Pinus massoniana Plantation Ecosystem

采用密度调控对贵州台江县12年生马尾松人工林碳储量进行研究。结果表明,密度调控提高了马尾松人工林乔木层、林下植被和凋落物层碳的累积,高密度(H)(1 800株·hm^(-2))、中密度(M)(1 566株·hm^(-2))和低密度(L)(1 350株·hm^(-2))及CK(未间伐:2 016株·hm^(-2))密度下马尾松人工林各组分碳储量乔木层>土壤层>林下植被层>凋落物层。乔木层碳储量分别高出CK2.58、5.69t·hm^(-2)和1.38t·hm^(-2);土壤层分别高出CK3.50、4.95t·hm^(-2)和-13.43t·hm^(-2);林下植被层分别高于CK1.88、2.59t·hm^(-2)和4.14t·hm^(-2),凋落物层分别高于CK0.14、0.27t·hm^(-2)和0.36t·hm^(-2),林下植被和凋落物层碳储量较CK达显著差异(p<0.05);H和M密度下生态系统总碳储量分别较CK提高8.1t·hm^(-2)和13.49t·hm^(-2),L密度低于CK7.54t·hm^(-2),马尾松人工林生态系统总碳储量以M密度调控最大,故马尾松中龄人工林林分经营过程中以M密度经营较好。

An investigation of the effects of density regulation on carbon deposits was conducted on a 12-year-old Pinus massoniana plantation located in Taijiang County of Guizhou Province.Besides the control（CK,without regulated,2 610plant·hm^（-2））,three densities were set up：high（H,1 800plant·hm^（-2））,medium（M,1 566plant·hm^（-2））,and low（L,1 350plant·hm^（-2））.The results showed that density regulation helped improving the carbon accumulation in the tree layer,understory vegetation and litter layer.The amounts of carbon storage was in the order of tree layersoil layerlitter layer undergrowth layer under all densities.The carbon storages in tree layers with high,medium and low densities were 2.58,5.69,and 1.38t·hm^（-2） higher than that of the control;in soil layer,3.50,4.95,and 13.43t·hm^（-2） higher,in litter layer,1.88,2.59,and 4.14t·hm^（-2） higher;and in undergrowth layer,0.14,0.27,and 0.36t·hm^（-2）higher.The carbon storages of understory vegetation and undergrowth layer were significantly different compared with CK（p〈0.05）.The total carbon storages of the ecosystem with H and M densities were8.1t·hm^（-2） and 13.49t·hm^（-2） higher than the CK,and with L density,7.54t·hm^（-2） less than the CK.It was concluded that the total carbon storage of P.massoniana plantation ecosystem with M density was the highest,indicating that M density should be adopted in the management of middle-age P.massoniana plantation.