迭部林区云冷杉林火烧迹地土壤有机碳及酶活性变化特征  

Characteristics of Soil Organic Carbon and Changes of Enzyme Activities in Burned Area of Spruce-Fir Forests in Diebu Forest Region

作　　者：陆刚 黄海霞[1] 周晓雷[1] 曹雪萍 赵安 LU Gang;HUANG Hai-xia;ZHOU Xiao-lei;CAO Xue-ping;ZHAO An(College of Forestry, Gansu Agricultural University, Lanzhou, Gansu Province 730070, China)

机构地区：[1]甘肃农业大学林学院,甘肃兰州730070

出　　处：《草地学报》2022年第4期943-949,共7页Acta Agrestia Sinica

基　　金：熊猫国家公园野生植物种群生境保护与恢复研究(03619078)资助。

摘　　要：为了探究火烧对土壤有机碳的影响机制,本研究以迭部林区15年云冷杉林火烧迹地与未火烧林地为研究对象,通过野外调查采样和室内测定,研究了土壤有机碳组分含量、土壤酶活性的变化特征。结果表明:土壤总有机碳、重组有机碳、颗粒有机碳含量与土壤脲酶、磷酸酶、过氧化氢酶活性均随土层加深而降低;火烧降低了土壤总有机碳、重组有机碳和颗粒有机碳含量;火烧使土壤磷酸酶、过氧化物酶活性升高,脲酶活性降低;土壤轻组有机碳、重组有机碳、颗粒有机碳含量与土壤总有机碳含量表现为极显著正相关关系;土壤脲酶、磷酸酶、过氧化氢酶活性促进了土壤有机碳的积累;多酚氧化酶与过氧化物酶活性抑制了土壤有机碳的积累。In order to explore the mechanism of fire on soil organic carbon,field sampling and laboratory experiments were carried out in the areas of spruce and fir forest in the forest region which were unburned or had been burned for 15 years.The results showed that:the contents of soil total organic carbon(TOC),heavy fraction organic carbon(HFOC),particulate organic carbon(POC)and the activities of soil urease,phosphatase and catalase decreased with the increase of the depth of soil layer;the contents of TOC,HFOC and POC were reduced by fire;fire increased the activity of soil phosphatase and peroxidase,decreased the activity of urease;light fraction organic carbon(LFOC),HFOC,and POC were positively correlated with TOC,and the activities of soil urease,phosphatase,and catalase promoted the accumulation of SOC.The activities of polyphenol oxidase and peroxidase inhibited the accumulation of SOC.

关 键 词：火烧迹地 云冷杉林 土壤有机碳组分 土壤酶活性 

分 类 号：S154.2[农业科学—土壤学]