In forest ecosystems,landslides are one of the most common natural disturbances,altering the physical,chemical and microbial characteristics of soil and thus fur-ther altering ecosystem properties and processes.Although secondary forests comprise more than 50％of global for-ests,the influence of landslides on the soil properties in these forests is underappreciated.Therefore,this study investigates the influence of landslides on the chemical and microbial nature of the soil.Study of these modifications is critical,as it provides baseline evidence for subsequent forest re vegetation.We selected four independent landslides and adjacent secondary forest stands as references in a tem-perate secondary forest in northeastern China.Soils were obtained from each stand at 0-10 cm and 10-20 cm depths to determine chemical and microbial properties.Soil total carbon(TC),total nitrogen(TN),nitrate(NO3--N),available phosphorus(P),microbial biomass carbon(MBC),microbial biomass nitrogen(MBN),microbial biomass phosphorus(MBP)and phenol oxidase,exoglucanase,β-glucosidase,N-acetyl-β-glucosaminidase,L-asparaginase and acid phos-phatase activities were 29.3-70.1％lower at the 0-10 cm soil depth in the landslide sites than at the secondary for-est sites,whereas total phosphorus(TP)and ammonium(NH4+-N)were unaffected by the landslides.N-related enzymes,N-acetyl-β-glucosaminidase and L-asparaginase were reduced by more than 65％in the landslide sites,con-sistent with the decrease in nitrate concentration at the same 0-10 cm depth.At a depth of 10-20 cm,the variations in the soil properties were consistent with those at the 0-10 cm depth.The results demonstrated that soil chemical and microbial properties were significantly disrupted after the landslides,even though the landslides had occurred 6 years earlier.A long time is thus needed to restore the original C and nutrient levels.In temperate secondary forests,soil TC and TN contents were found to be more suitable for estimat-ing the state of soil restoration than soil TP content.

Yakun Zhang;Chen Miao;Jiaojun Zhu;Tian Gao;Yirong Sun;Jinxin Zhang;Shuang Xu;Kai Yang

Qingyuan Forest CERN,Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,People's Republic of China;CAS Key Laboratory of Forest Ecology and Management,Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,People's Republic of China;University of Chinese Academy of Sciences,Beijing 100049,People's Republic of China

林业研究（英文版）

[1]Yakun Zhang;Chen Miao;Jiaojun Zhu;Tian Gao;Yirong Sun;Jinxin Zhang;Shuang Xu;Kai Yang-.The impact of landslides on chemical and microbial properties of soil in a temperate secondary forest ecosystem)[J].林业研究（英文版）,2022(06):1913-1923

perate,exoglucanase,estimat

impact,landslides,chemical,microbial,properties,soil,temperate,secondary,In,ecosystems,are,one,most,common,natural,disturbances,altering,physical,characteristics,thus,fur,ther,processes,Although,forests,comprise,more,than,global,influence,these,underappreciated,Therefore,this,study,investigates,nature,Study,modifications,critical,provides,baseline,evidence,subsequent,vegetation,We,selected,four,independent,adjacent,stands,references,northeastern,China,Soils,were,obtained,from,each,depths,determine,total,carbon,nitrogen,TN,nitrate,NO3,available,phosphorus,biomass,MBC,MBN,MBP,phenol,oxidase,glucosidase,acetyl,glucosaminidase,asparaginase,acid,phatase,activities,lower,sites,whereas,TP,ammonium,NH4+,unaffected,by,related,enzymes,reduced,decrease,concentration,same,At,variations,consistent,those,results,demonstrated,that,significantly,disrupted,after,even,had,occurred,years,earlier,long,needed,restore,original,nutrient,levels,contents,found,be,suitable,state,restoration

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