不同雪被处理对川西亚高山森林土壤腐殖质含量的影响  

Effects of different snow treatments on soil humus content in subalpine forest soils in western Sichuan,China

作　　者：黄雯澜 刘谣 简毅[3] 张琳慧 陈素 黄路路 俞丽云 李晗[1] 王丽霞 谭波[1] 张丽[1] HUANG Wen-Lan;LIU Yao;JIAN Yi;ZHANG Lin-Hui;CHEN Su;HUANG Lu-Lu;YU Li-Yun;LI Han;WANG Li-Xia;TAN Bo;ZHANG Li(National Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety on the Upper Reaches of the Yangtze River,Forestry Ecological Engineering in the Upper Reaches of the Yangtze River Key Laboratory of Sichuan Province,College of Forestry,Sichuan Agricultural University,Chengdu 611130,China;Luzhou Forest Scientific Institute,Luzhou,Sichuan 646000,China;Sichuan Academy of Forestry,Chengdu 610081,China)

机构地区：[1]长江上游森林资源保育与生态安全国家林业和草原局重点实验室,长江上游林业生态工程四川省重点实验室,四川农业大学林学院,成都611130 [2]泸州市林业科学研究院,四川泸州646000 [3]四川林业科学研究院,成都610081

出　　处：《植物生态学报》2024年第11期1445-1458,共14页Chinese Journal of Plant Ecology

基　　金：四川省自然科学基金(2024NSFSC0354);国家自然科学基金(31700542)。

摘　　要：雪被减少可能通过改变地表水热环境及微生物活性作用于高寒森林有机质周转过程,进而影响土壤腐殖质合成与分解。该研究以川西亚高山岷江冷杉(Abies fargesii var.faxoniana)林为研究对象,借助野外雪被控制实验,设置对照(自然雪被)、雪被减少(雪被去除50%)和雪被去除(雪被去除100%)3个雪被水平,采用野外原位培养的方法,研究了雪被减少/去除对土壤可提取腐殖质、胡敏酸和富里酸含量及光谱学特性等的影响,结合动态监测的环境因子和土壤理化性质等,探讨不同雪被处理与土壤腐殖质的动态关联。结果表明:(1)雪被减少/去除均显著降低了土壤可提取腐殖质、胡敏酸和富里酸含量。(2)土壤腐殖化程度均较低,3种雪被处理下土壤胡敏酸/富里酸值均小于1,胡敏酸/可提取腐殖质值均小于0.5。(3)相关性分析表明,全氮含量与土壤可提取腐殖质、胡敏酸和富里酸含量均呈显著负相关关系。综上所述,雪被减少/去除均降低了土壤腐殖质的含量和土壤腐殖化程度。Aims The reduction of snow cover may affect the organic matter turnover process in alpine forests by altering the surface hydrothermal environment and microbial activity,thereby affecting the synthesis and decomposition of soil humus.Methods Focusing on the Abies fargesiivar.faxoniana fir forest in the subalpine region of western Sichuan,three snow cover treatments were set up in field:control(natural snow cover),snow cover reduction(50%snow cover removal),and snow cover removal(100%snow cover removal).The study investigated the effect of snow cover reduction/removal on soil extractable humic substance,humic acid,fulvic acid contents,and spectroscopic characteristics of humic substances.The study further explored the dynamic correlations between different snow cover treatments and soil humus based on dynamic monitoring of environmental factors and soil physicochemical properties.Important findings The results showed that:(1)The snow cover reduction/removal treatment significantly reduced contents of soil extractable humic substance,humic acid,and fulvic acid.(2)Soil humification was low in all three snow cover treatments,with soil humic/fulvic acid values less than 1 and humic/extractable humic substance values less than 0.5.(3)Correlation analysis showed that total nitrogen content was negatively correlated with contents of soil extractable humic substance,humic acid,and fulvic acid.In summary,the snow cover reduction/removal treatments reduced soil humus content and affected the degree of soil humification.These results could facilitate an in-depth understanding of the formation of soil humus and the mechanisms of soil fertility maintenance in subalpine forests.

关 键 词：腐殖质 胡敏酸 富里酸 雪被 亚高山森林 

分 类 号：S15[农业科学—土壤学]