西北林学院学报2018，Vol.33Issue(2)：35-42,8.DOI:10.3969/j.issn.1001-7461.2018.02.06
秦岭辛家山典型植被类型土壤活性有机碳分布特征
Distribution Characteristics of Active Soil Organic Carbon under Typical Vegetation Types in Xinjiashan Forest in Qinling Mountains
摘要
Abstract
In order to explore the distribution characteristics of soil organic carbon as well as active soil organic carbon under typical vegetation types at different altitudes in Xinjiashan forests of Qinling Mountains,soil samples of 0-10,10-20,20-40 and 40-60 cm in depth were collected to analyze the variations in soil organic carbon (SOC),soil dissolved organic carbon (DOC),microbial biomass carbon (MBC) and soil readily oxidizable carbon (ROC) under the vegetation types of Picea asperata,Shrub,Betula albo-sinensis,Larix and Quercus aliena var.acuteserrata.The results indicated that 1) SOC in high altitude area was significantly higher than in low altitude area,SOC in high altitude area was in the order of Shrubs＞P.asperata＞B.albo-sinensis along the whole soil profiles;SOC of Larix was greater than Q.aliena vat.acuteserrata in low altitude area.2) DOC and MBC in high altitude area were higher than in low altitude area.The MBC contents of P.asperata and the ROC contents of Shrubs were higher than the corresponding values in the same soil layer of other vegetation types.ROC in high altitude area was in the order of Shrubs＞P.asperata＞B.albo-sinensis along the whole soil profiles;ROC of Larix was greater than the Q.aliena var.acuteserrata in low altitude area.3) The DOC/SOC ratio increased with the increase of soil depth,while the ROC/SOC ratio decreased with soil depth for all vegetation types.Nevertheless,the variations of MBC/SOC ratio along soil profile differed among different vegetation types.4) There were significant positive correlations between SOC,DOC,MBC,ROC,total nitrogen (TN) and soil moisture content.The contents of soil organic carbon and active soil organic carbon were negatively correlated with soil bulk density and pH.The present study demonstrated that soil organic carbon in high altitude area was significantly higher than low altitude area,SOC in high altitude area was Shrubs＞coniferous forest＞broadleaf forest along the whole soil profiles.SOC of coniferous forest was greater than broadleaf forest at the same altitude.The active fractions of soil organic carbon were under the combined effects of many various factors and they could quickly respond to the environmental changes and variations of soil organic carbon pool.关键词
秦岭/植被类型/土壤有机碳/土壤活性有机碳Key words
Qinling Mountains/vegetation type/soil organic carbon/active soil organic carbon分类
农业科技引用本文复制引用
王强,韩欢,耿增超,侯琳,和文祥,张彤彤,王志康..秦岭辛家山典型植被类型土壤活性有机碳分布特征[J].西北林学院学报,2018,33(2):35-42,8.基金项目
国家林业公益性行业科研专项(201304307). （201304307）
