滇中高原湖泊湖滨带土壤生态化学计量特征及影响因素研究  

Soil Eco-chemical Stoichiometry Characteristics and Influencing Factors of Lake-shore Zone of a Plateau Lake in Central Yunnan

作　　者：杨坤武[1] 尹鹏飞 尹继清 熊静 贾雨欣 张文翔[1,2] YANG Kunwu;YIN Pengfei;YIN Jiqing;XIONG Jing;JIA Yuxin;ZHANG Wenxiang(Yunnan Key Lab of Plateau Geographic Processes and Environmental Changes,Faculty of Geography,Yunnan Normal University,Kunming 650500,China;Yunnan Universities Key Lab of Plateau Surface Processes and Environmental Changes,Kunming 650092,China)

机构地区：[1]云南师范大学地理学部,云南省高原地理过程与环境变化重点实验室,云南昆明650500 [2]云南省高校高原地表过程与环境变化重点实验室,云南昆明650092

出　　处：《环境科学与技术》2024年第4期187-196,共10页Environmental Science & Technology

基　　金：国家自然科学基金项目(42161017)。

摘　　要：湖滨带是地球化学元素循环高度活跃且极易受环境变化与人类活动影响的敏感地带。文章通过对滇中湖泊杞麓湖湖滨带土壤碳(C)、氮(N)、磷(P)含量的分析,结合冗余分析和结构方程模型等,研究了土壤生态化学计量的时空变化特征及其与土壤理化性质间的耦合关系。结果表明,杞麓湖湖滨带土壤总有机碳(TOC)、总氮(TN)、总磷(TP)平均含量分别为31.97、1.79、1.01 g/kg。雨季土壤TOC、TN含量低于旱季,在湖滨带结构上均呈现水向带>消落带>陆向带的特征,且随土壤深度的增加而降低,TP时空差异不显著。土壤C∶N、C∶P和N∶P平均值分别为23.08、41.38、2.10,表明湖滨带土壤有机质的分解速率较慢,释放有效磷的潜力大,植物生长易受到氮的限制,而磷的高含量将影响杞麓湖流域生态环境保护。土壤容重、含水率和黏土含量通过改变其C、N、P含量,进而影响土壤生态化学计量比。The lake-shore zone is the sensitive region where the geochemical element cycle is highly active and highly susceptible to environmental changes and human activities.This paper dealt with the study on the spatial and temporal variation characteristics of soil eco-chemical stoichiometry and its coupling relationship with soil physical and chemical properties based on the analysis of soil carbon(C),nitrogen(N)and phosphorus(P)contents in the riparian zone of Qilu Lake of central Yunnan Province in association with redundancy analysis and the structural equation model,etc.Consequently,the study revealed that the contents in average of TOC,TN and TP in the lake-shore soil were 31.97 g/kg,1.79 g/kg,and 1.01 g/kg,respectively,and TOC and TN in rainy season being lower than in dry season;in addition,in terms of the structure of the lake-shore zone C:P and N:P were in order of decreasing magnitude:the zone towards water>draw-down zone>the zone towards land,in addition,decreasing with the increase of soil depth,and there was no significant spatial-temporal differ-ence in TP content;and the average values of C∶N,C∶P and N∶P were equal to 23.08,41.38 and 2.10,respectively.As a whole,the study indicated that the lower decomposition rate of organic matter,the greater potentiality in releasing available P in the lake-shore zone,and plant growth was mainly N-limited,the high P content will affect the ecological environment conservation in the lake catchment,and the changes of C,N and P content would affect soil’s volume-weight ra-tio,moisture content and clay content,and further influence the soil eco-chemical stoichiometric ratio.

关 键 词：生态化学计量 湖滨带 时空特征 杞麓湖 偏最小二乘法结构方程 

分 类 号：X144[环境科学与工程—环境科学]