冻融期巴音布鲁克高寒湿地雪被去除对土壤有机碳库稳定性的影响  

Effect of Snow Removal on Stability of Soil Organic Carbon Pool During Freeze-Thaw Period in Bayinbuluk Alpine Wetland

作　　者：胡云鹏 陈末 杨再磊 买迪努尔·阿不来孜 田宇欣 贾宏涛[1,3,4] 寇天乐 贾远彬 Hu Yunpeng;Chen Mo;Yang Zailei;Maidinur·Ablaizi;Tian Yuxin;Jia Hongtao;Kou Tianle;Jia Yuanbin(College of Resources and Environment,Xinjiang Agricultural University,Urumqi,Xinjiang 830052,China;College of Grassland Science,Xinjiang Agricultural University,Urumqi,Xinjiang 830052,China;Xinjiang Key Laboratory of Soil and Plant Ecological Processes,Urumqi,Xinjiang 830052,China;College of First-year Students,Xinjiang Agricultural University,Urumqi,Xinjiang 830006,China)

机构地区：[1]新疆农业大学资源与环境学院,新疆乌鲁木齐830052 [2]新疆农业大学草业学院,新疆乌鲁木齐830052 [3]新疆土壤与植物生态过程重点实验室,新疆乌鲁木齐830052 [4]新疆农业大学新生学院,新疆乌鲁木齐830006

出　　处：《水土保持通报》2024年第3期326-334,共9页Bulletin of Soil and Water Conservation

基　　金：新疆维吾尔自治区自然科学基金项目“高寒湿地冻融期枯落物分解的微生物机制研究”(2022D01A192);国家自然科学基金“巴音布鲁克天鹅湖高寒湿地土壤有机碳库及其稳定性研究”(31560171)。

摘　　要：[目的]分析冻融期降雪减少对巴音布鲁克高寒湿地土壤有机碳组分及碳库稳定性的影响,为高寒湿地应对未来气候变化及区域“碳中和”战略措施的制定提供科学数据。[方法]于2022年9月布设野外试验,设置2种处理:雪被去除与自然降雪,分别在冻融期的初冻期(11月)、冻结期(3月)、融冻期(7月)进行取样,测定土壤含水量(SWC)、电导率(EC)、pH值,有机碳含量(SOC),极不稳定有机碳组分(F_(1))、不稳定有机碳组分(F_(2))、稳定有机碳组分(F_(3))和惰性有机碳组分(F_(4))。[结果](1)雪被去除后土壤有机碳含量(SOC)在初冻期、冻结期、融冻期均无显著差异,但出现了降低的趋势。雪被去除后有机碳含量在3时期分别降低了2.87%,6.65%和4.49%。(2)初冻期雪被去除后F_(1)和F_(2)组分有机碳含量出现了显著差异(p<0.05)。相比于自然降雪两种组分有机碳含量分别降低了8.72%和12.26%。冻结期不同处理间F_(3)组分了出现显著差异(p<0.05)。雪被去除后F_(3)组分有机碳含量降低了25.57%,融冻期F_(1),F_(2)和F_(3)出现了显著差异(p<0.05),其中除雪后F_(1)和F_(3)分别降低了22.10%和25.57%,而F_(2)组分上升了34.92%。其他组分无显著差异。(3)雪被去除后,相比于自然降雪处理,碳库活度在3个时期分别上升了5.99%,9.71%和20.39%。雪被去除后土壤有机碳有降低的趋势,但土壤碳库稳定性有上升的趋势。而随着冻融进行,土壤有机碳含量呈现出先降低后上升的趋势,而土壤碳库稳定性呈现出先上升后下降的趋势。[结论]短期观测结果表明冻融循环和雪被去除对有机碳含量和碳库稳定性均无显著影响,但雪被去除对土壤的影响大于冻融变化,未来需进一步开展长期定位观测研究,以更好服务高寒湿地科学管理和助力区域碳中和战略实施。[Objective]The effects of snow removal on soil organic carbon(SOC)compositions and carbon pool stability during the freezing-thawing period in Bayinbuluk alpine wetland were analyzed in order to provide scientific data to help the alpine wetland in coping with future climate change and to formulate a regional carbon neutrality strategy.[Methods]A field experiment was conducted in September 2022 with two treatments:snow removal and natural snowfall.Soil samples were collected during the initial freezing period(November),the freezing period(March),and the thawing period(July).Soil water content(SWC),electrical conductivity(EC),pH value,SOC content,very unstable organic carbon(F_(1)),unstable organic carbon(F_(2)),stable organic carbon(F_(3)),and inert organic carbon(F_(4))were measured.[Results](1)There was no significant difference in SOC content after snow removal during the initial freezing,freezing,and thawing periods,but there was a decreasing trend.The SOC content after snow removal decreased by 2.87%,6.65%,and 4.49%during the initial freezing,freezing,and thawing periods,respectively.(2)There were significant differences in the SOC contents of F_(1)and F_(2)after snow removal in the initial freezing period(p<0.05),and these values were 8.72%and 12.26%,respectively,lower than with the natural snowfall treatment.There were significant differences in the F_(3)contents among different treatments in the freezing period(p<0.05),which were reduced by 25.57%after snow removal.There were significant differences in the F_(1),F_(2)and F_(3)contents in the thawing period(p<0.05),among which F_(1)and F_(3)were reduced by 22.10%and 25.57%,respectively,after snow removal,while F_(2)was increased by 34.92%.There were no significant differences in other components.(3)The carbon pool activity in the initial freezing,freezing,and thawing periods was 5.99%,9.71%and 20.39%,respectively,greater after snow removal than with the natural snowfall treatment.The SOC exhibited a decreasing trend after snow removal,but the stability of

关 键 词：高寒湿地 冻融期 雪被去除 有机碳组分 碳库稳定性 

分 类 号：S153.6[农业科学—土壤学]