Soil Eco-chemical Stoichiometry Characteristics and Influencing Factors of Lake-shore Zone of a Plateau Lake in Central Yunnan
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.
eco-chemical stoichiometrylake-shore zonespatial-temporal characteristicsQilu Lakepartial least squares structural equation(PLS-SEM)
万方数据
维普
