秦岭典型林分土壤活性有机碳及碳储量垂直分布特征  

Vertical distribution of soil active carbon and soil organic carbon storage under different forest types in the Qinling Mountains

作　　者：王棣[1] 耿增超[1] 佘雕[2] 和文祥[1] 侯琳[3] 

机构地区：[1]西北农林科技大学资源环境学院/农业部西北植物营养与农业环境重点实验室,陕西杨凌712100 [2]西北农林科技大学水土保持研究所,陕西杨凌712100 [3]西北农林科技大学林学院,陕西杨凌712100

出　　处：《应用生态学报》2014年第6期1569-1577,共9页Chinese Journal of Applied Ecology

基　　金：国家林业公益性行业科研专项(201304307)资助

摘　　要：采用野外调查结合室内分析的方法，2013年8月分析了秦岭典型林分锐齿栎（马头滩林区，Ⅰ）、油松（Ⅱ）、华山松（Ⅲ）、松栎混交林（Ⅳ）、云杉（Ⅴ）、锐齿栎（辛家山林区，Ⅵ）土壤剖面上活性有机碳及碳储量的分布规律．结果表明：研究区各林分土壤的有机碳、微生物生物量碳、水溶性碳、易氧化态碳含量均随着土层深度的增加而不断减小；在整个土壤剖面（0～60cm）上，云杉和松栎混交林的土壤有机碳和水溶性碳含量明显高于其余林分，不同林分的土壤有机碳和水溶性碳含量的平均值大小均为Ⅴ〉Ⅳ〉Ⅰ〉Ⅱ〉Ⅲ〉Ⅵ；各林分不同土层的微生物生物量碳在71．25～710．05mg·kg^-1，不同林分的土壤微生物生物量碳大小依次为Ⅰ〉Ⅴ〉Ⅳ〉Ⅲ〉Ⅱ〉Ⅵ；整个土壤剖面上，松栎混交林的土壤易氧化态碳含量降幅最大，不同林分土壤易氧化态碳含量的平均值大小为Ⅳ〉Ⅴ〉Ⅰ〉Ⅱ〉Ⅲ〉Ⅵ．3种活性有机碳占有机碳的比例在不同林分类型中没有表现出一致的规律性．各林分0～60cm土层的有机碳储量大小为Ⅴ〉Ⅰ〉Ⅳ〉Ⅲ〉Ⅵ〉Ⅱ．各林分的土壤微生物生物量碳、水溶性碳、易氧化态碳两两之间均表现为极显著相关，各林分的土壤微生物生物量碳、水溶性碳、易氧化态碳与土壤有机碳、全氮之间的相关性均表现为显著或极显著水平，与碳氮比、pH、土壤水分、土壤容重的相关关系不显著．Adopting field investigation and indoor analysis methods, the distribution patterns of soil active carbon and soil carbon storage in the soil profiles of Quercus aliena var. acuteserrata （ Matou- tan Forest, Ⅰ ）, Pinus tabuliformis （ Ⅱ ） , Pinus armandii （ Ⅲ） , pine-oak mixed forest （Ⅳ） , Pi- cea asperata （ Ⅴ ）, and Quercus aliena var. acuteserrata （Xinjiashan Forest, Ⅵ ） of Qinling Mountains were studied in August 2013. The results showed that soil organic carbon （ SOC ）, microbial biomass carbon （MBC） , dissolved organic carbon （DOC） , and easily oxidizable carbon （EOC） decreased with the increase of soil depth along the different forest soil profiles. The SOC and DOC contents of different depths along the soil profiles of P. asperata and pine-oak mixed forest were higher than in the other studied forest soils, and the order of the mean SOC and DOC along the different soil profiles was Ⅴ 〉 Ⅳ 〉 Ⅰ 〉 Ⅱ 〉 Ⅲ 〉 Ⅵ. The contents of soil MBC of the different forest soil profiles were 71.25-710.05 mg ·kg^-1, with a content sequence of Ⅰ 〉Ⅴ 〉Ⅳ〉Ⅱ〉 Ⅱ 〉Ⅵ. The content of EOC along the whole soil profile of pine-oak mixed forest had a largest decline, and the order of the mean EOC was Ⅳ〉 Ⅴ〉 Ⅰ 〉Ⅱ 〉Ⅲ〉Ⅵ. The sequence of soil organic carbon storageof the 0-60 cm soil layer was Ⅴ 〉 Ⅰ 〉Ⅳ 〉 Ⅲ 〉 Ⅵ 〉 Ⅱ. The MBC, DOC and EOC contents of the dif- ferent forest soils were significanty correlated to each other. There was significant positive correla- tion among soil active carbon and TOC, TN. Meanwhile, there was no significant correlation be- tween soil active carbon and other soil basic physicochemical properties.

关 键 词：垂直分布 土壤有机碳 活性有机碳 碳储量 秦岭 

分 类 号：S714[农业科学—林学]