煤田地质与勘探2026，Vol.54Issue(3)：202-210,9.DOI:10.12363/issn.1001-1986.25.11.0873
新疆干旱采煤沉陷区自然恢复年限土壤微生物量与有机碳组分特征
Soil microbial biomass and organic carbon fractions under different natural restoration years in arid coal mining subsidence areas in Xinjiang,China
摘要
Abstract
[Objective]This study aims to elucidate the influence of the natural restoration process on changes in soil mi-crobial biomass and organic carbon fractions in coal mining subsidence areas.This effort will provide a crucial scientif-ic foundation for understanding the natural ecological restoration process and carbon accumulation dynamics in arid coal mining subsidence areas.[Methods]Arid coal mining subsidence areas in Xinjiang,China were investigated in this study.Using the space-for-time substitution approach,sample plots were selected from an unmined area and areas hav-ing undergone natural restoration for one,three,eight,and 12 years.Subsequently,systematic analyses were conducted on the dynamic changes in the general physicochemical properties,microbial biomass carbon(MBC),microbial bio-mass nitrogen(MBN),microbial biomass phosphorus(MBP),and organic carbon fractions of soils at depths of 0-10 cm and 10-20 cm in the sample plots.The purpose is to provide a scientific basis for accelerating ecological restoration in coal mining areas.[Results and Conclusion]The natural restoration across different years exhibits distinct phased changes.After one year of natural restoration,the soil organic carbon(SOC),total nitrogen(TN),total phosphorus(TP),and available phosphorus(AP)rapidly declined to their lowest levels.Then,these metrics increased slowly,recovering to only 60％-90％of their pre-mining levels after 12 years of natural restoration.Soil microbial biomass in the coal min-ing subsidence areas exhibited temporal accumulation during natural restoration.This characteristic,as well as the stoi-chiometric characteristics of soil microbial biomass,implies the carbon source limitation in the early-stage natural restor-ation.During the later stage of natural restoration,the MBN proved more deficient compared to the MBP,while the lim-itation of MBC and MBN gradually decreased with increasing years of natural restoration.Additionally,after 12 years of natural restoration,particulate organic carbon(POC)and mineral-associated organic carbon(MAOC)accounted for 21％-33％and 67％-79％of the SOC,respectively,suggesting a higher restoration rate of MAOC compared to POC.The surface soil POC was affected by soil TN and TP.In contrast,the microbial utilization of dissolved organic carbon(DOC)and AP led to elevated MBC,ultimately driving the MAOC accumulation in the surface soil.The subsurface soil POC and MAOC accumulated synchronously under the influence of TN,dissolved organic nitrogen(DON),TP,and AP,reflecting the impact of nutrient-microbial coupling on carbon dynamics.Overall,soil microbial biomass and organic carbon fractions were subjected to severe damage during the early-stage natural restoration.In the late-stage natural res-toration,they were improved but failed to completely recover to the pre-mining levels.It is recommended to accelerate ecological restoration and promote carbon sink functions by combining artificial vegetation.关键词
采煤沉陷地/自然恢复/空间代替时间法/土壤养分/微生物生物量/有机碳组分Key words
coal mining subsidence areas/natural restoration/space-for-time method/soil nutrients/microbial biomass/organic carbon components分类
矿业与冶金引用本文复制引用
肖礼,毕银丽,王董董,李剑锋,龚翰林,邓媪绢,侯文盛..新疆干旱采煤沉陷区自然恢复年限土壤微生物量与有机碳组分特征[J].煤田地质与勘探,2026,54(3):202-210,9.基金项目
国家重点研发计划课题(2022YFF1303305) （2022YFF1303305）
国家自然科学基金项目(52394194,52574217) （52394194,52574217）
