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以广西六万林场31年生3种密度柳杉(Cryptomeria fortunei)人工林为对象,对其碳、氮储量以及碳、氮分配格局进行研究。结果表明:低、中、高3种密度的柳杉人工林生态系统碳储量分别为355.72、417.21和378.71t.hm-2,氮储量分别为17.91、22.13和19.99t.hm-2,均表现为中密度﹥高密度﹥低密度;低、中、高密度植被层碳储量分别为127.71、101.98和100.12t.hm-2,分别为土壤层碳储量的56.01%、32.35%、35.94%,表现为低密度﹥中密度﹥高密度;植被层氮储量分别为1048.85、674.26和705.69kg.hm-2,为土壤层氮储量的6.22%、3.14%、3.66%,则表现为低密度﹥高密度﹥中密度。充分说明桂东南柳杉人工林生态系的碳、氮储量受林分密度的影响,且碳、氮储量主要分布在土壤层。
The 31-year-old Cryptomeria fortunei plantations in Liuwulin Forest Farm of Guangxi were used to study their carbon and nitrogen storage and distribution pattern of carbon and nitrogen. The results showed that the carbon storage of Cryptomeria fortunei plantations with low, medium and high density was 355.72, 417.21 and 378.71t.hm-2 respectively, and the nitrogen reserves were 17.91, 22.13 and 19.99 t · hm-2 respectively, Which was medium density> high density> low density. The carbon storage of low, medium and high density vegetation layers was 127.71, 101.98 and 100.12t.hm-2, respectively, which were 56.01%, 32.35% and 35.94% Which is low density> medium density> high density. The nitrogen reserves in vegetation layer are 1048.85,674.26 and 705.69kg.hm-2, respectively, which are 6.22%, 3.14% and 3.66% > Medium density. It was fully demonstrated that the carbon and nitrogen reserves of Cryptomeria fortunei ecosystem in southeastern China were affected by the stand density, and the carbon and nitrogen reserves were mainly distributed in the soil layer.