岩溶山区土地利用方式对土壤活性有机碳及其分布的影响  

Impact of land use type on soil active organic carbon and its distribution in karst mountain

作　　者：蓝家程[1] 傅瓦利[1] 袁波[1] 彭景涛[1] 张婷[1] 付允[1] 

机构地区：[1]西南大学地理科学学院,重庆400715

出　　处：《中国岩溶》2011年第2期175-180,共6页Carsologica Sinica

基　　金：重庆市移民局课题(200909);重庆市自然科学基金(40701179)

摘　　要：对重庆中梁山不同土地利用方式下的0~50 cm土壤活性有机碳含量和分布进行研究。结果表明：不同利用方式土壤有机碳（SOC）含量大小顺序为：竹林〉菜地〉草地〉林地〉园地〉弃耕地,且均表现为0~20 cm层大于20~50 cm层;土壤溶解性有机碳（DOC）含量平均值大小顺序为：林地〉竹林〉弃耕地〉草地〉园地〉菜地,土壤溶解性有机碳占土壤有机碳的比例随土层深度增加而增加;土壤易氧化有机碳（EOC）含量及其剖面分布与土壤有机碳含量变化相一致,相关分析表明,两者的相关性达到极显著水平（R=0.852,P〈0.0001）,对土壤有机碳变化反应敏感。Soil active organic carbon and its distribution in the soils（0~50 cm） under different land use type are studied in Zhong Liang knoll,Chongqing.The results reveal that： 1）the contents of the soil organic carbon（SOC） under different land use types are bamboo land vegetable land grassland woodland garden abandoned farmland,and the contents of SOC in the layer between 20 to 50 cm deep is more than that between 0 to 20 cm;2） the average contents of soil dissolved organic carbon（DOC） are woodland bamboo land abandoned farmland grassland garden vegetable land;3） the percentage of soil dissolved organic carbon to the total soil organic carbon increased with depth;4） the easily oxidized organic carbon（EOC） content and its distribution on the profile is consistent with the changes of soil organic carbon content.Correlation analysis shows that the correlation between easily oxidized organic carbon and soil organic carbon gets very significant level（R=0.852,P0.000 1）,proving that the EOC is susceptible to the change of SOC.

关 键 词：岩溶区 土地利用方式 土壤有机碳 土壤活性有机碳 土壤溶解性有机碳 土壤易氧化有机碳 

分 类 号：S153[农业科学—土壤学]