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基于49个土壤剖面和411个土壤样品的实测数据,分析了山西中部7种主要森林植被类型(天然山杨林TS、天然落叶松林TL、天然侧柏林TC、天然辽东栎林TD、天然油松林TY、人工油松林RY、人工刺槐林RC)的土壤有机碳(SOC)密度及其分布特征。研究结果如下:(1)7种森林植被类型的土壤容重总体平均值变化范围为0.91～1.27 g cm-3。(2)各森林植被类型SOC含量随土层深度增加而逐渐减少,二者之间的关系可用指数函数描述(P<0.001),在30cm处的各森林植被类型SOC含量减幅最大,天然林的SOC含量均高于人工林。(3)各森林植被类型之间的SOC总密度变化范围为5.50～11.82kg m-2,表现为TL>TY>TD>TS>TC>RC>RY。(4)各森林植被类型SOC主要集中在0～50cm以上的土体中,分别占到土壤总有机碳密度的70.40%(TS)、67.19%(TL)、92.61%(TC)、66.86%(TD)、71.66%(TY)、95.63%(RY)和53.74%(RC)。天然林SOC密度均大于人工林,这也意味着人工林在提高土壤SOC密度方面还具有巨大潜力,如果对该地区人工林进行长期严格封育管理,人工林将是这一地区一个巨大的碳汇。
Based on the measured data of 49 soil profiles and 411 soil samples, the main forest vegetation types in central Shanxi were analyzed (TS, TL, TL, TC, TD, TY, Artificial Pinus tabulaeformis RY and Artificial Robinia Pseudoarkeriensis RC). The results are as follows: (1) The average soil bulk density of seven types of forest vegetation varied from 0.91 to 1.27 g cm-3. (2) The SOC content of each forest type gradually decreased with the increase of soil depth. The relationship between them could be described by exponential function (P <0.001). The SOC content of each forest type at 30cm decreased the most. Natural forest The SOC content is higher than the plantation. (3) The total SOC density varied from 5.50 to 11.82 kg m-2 in all forest types, which showed TL> TY> TD> TS> TC> RC> RY. (4) The SOC of each vegetation type mainly concentrated in the soil above 0 ~ 50cm, accounting for 70.40%, 67.19%, 92.61% and 66.86% of the total soil organic carbon density respectively TD), 71.66% (TY), 95.63% (RY) and 53.74% (RC). The natural density of natural forests is greater than that of plantations, which also means that plantation has great potential to increase the SOC density of the soil. If long-term and strict management of planted forests in the area, the plantation will be a huge carbon in this area exchange.