应用生态学报2025，Vol.36Issue(2)：497-503,7.DOI:10.13287/j.1001-9332.202502.019
林火干扰后大兴安岭多年冻土区土壤胞外酶活性变化特征及其影响因素
Post-fire changes in soil extracellular enzyme activities and their influencing factors in the permafrost region of the Da Xing'anling Mountains,Northeast China
摘要
Abstract
Understanding the changes in soil enzyme activities and the influencing factors after forest fire distur-bances can help assess and predict the impacts of climate warming on permafrost ecosystems.We analyzed the acti-vities of extracellular enzyme,including urease(UR),acid phosphatase(AP),acetyl-glucosidase(NAG),β-glucosidase(βG),and leucine aminopeptidase(LAP),in soils(0-60 cm depth)across unburned,lightly burned and severely burned sites within the 2015 burned area in the northern Da Xing'anling Monntains.The results showed that fire intensity,soil depth,and soil physicochemical properties significantly influenced extracellu-lar enzyme activities.Compared to that in unburned site,the activities of UR,AP,βG,and LAP increased by 59.8％-241.7％,while NAG decreased by 35.5％at lightly burned site.The activities of all soil enzymes increased,with the magnitidues ranging from 26.0％to 206.0％at severely burned site.Soil enzyme activities gra-dually decreased with increasing soil depth.Redundancy analysis identified soil temperature(ST),total phosphorus(TP),C∶P,C∶N,soil depth and soil water content(SWC)as important influencing factors of soil enzyme activi-ties,contributing 70.9％,12.2％,4.7％,3.6％,2.9％,and 1.9％,respectively.Soil enzyme activities were signifi-cantly positively correlated with ST,TP,C∶P,C∶N,and SWC,but significantly negatively correlated with soil depth.Forest fires and the resultant changes in soil physicochemical properties jointly affected soil extracellular enzyme activities,with the effects intensifying with increasing fire intensity.关键词
林火/多年冻土/大兴安岭/土壤胞外酶活性/火烧强度Key words
forest fire/permafrost/Da Xing'anling Mountains/soil extracellular enzyme activity/fire intensity引用本文复制引用
沈阳,李晓英,蔡慧颖,许涛,李景涛,陈魁..林火干扰后大兴安岭多年冻土区土壤胞外酶活性变化特征及其影响因素[J].应用生态学报,2025,36(2):497-503,7.基金项目
本文由国家自然科学基金项目(42471166,32241032)、冰冻圈科学与冻土工程全国重点实验室自主部署项目(CSFSE-ZQ-2407)和黑龙江省优秀青年基金项目(YQ2022D002)资助. （42471166,32241032）
