Study On Ecological Stoichiometric Characteristics Of Leaves-Litter-Soil System Of Picea Schrenkiana Forests On The North Slope Of Tianshan Mountains

Carbon?C?,nitrogen?N?,phosphorus?P?and their stoichiometric ratio play a crucial role in controlling nutrient cycling and plant growth in ecosystems,and studying the relationship between them to understand the distribution of terrestrial ecosystems.The pattern and future trends are important,providing an important basis for further exploring the impact of global climate change on ecosystems and the feedback mechanisms of ecosystems.This paper takes Tianshan Picea schrenkianaforests as the research object,and explores the contents of C,N,P and its stoichiometry of plant leaves,litter and different soil layers on the spatial scale and their elevation,temperature?MAT?and precipitation.?MAP?response and using redundant analysis?RDA?techniques to analyze the relationship between leaves,litter and soil and physical and chemical factors,helping to elucidate the interaction mechanisms of leaves,litter and soil,and this The cycle of nutrients between the three and the response to different plant habitats.The main results were as follows:?1?The average values of C,N and P in the leaves of Picea schrenkianaforests were 462.312 g/kg,15.925 g/kg and 1.395 g/kg,respectively.The average values of C:N ratio,C:P ratio and N:P ratio were 32.139,377.614,11.602,respectively.There was a high dependence of leaves C and N contents,while N and P content had a very high dependence;C:N ratio and C:P ratio were controlled by C,N,P content,and N:P ratio was controlled by N and P content.?2?The average values of C,N and P in litter were 479.762 g/kg,13.954 g/kg and 1.052 g/kg,respectively.The average values of litter C:N ratio,C:P ratio and N:P ratio were 30.927,455.903,13.155,respectively.There was a very high dependence on the N and P contents of the leaves;the litter C:N ratio and C:P ratio were the same as the C:N ratio and C:P ratio of the leaves,and were also controlled by C,N and P contents,and N:P ratio was only controlled by the N content.?3?The average values of C,N and P in the 0-30 cm layer were 83.214 g/kg,6.314 g/kg and 0.822 g/kg,respectively.The average values of C:N ratio,C:P ratio and N:P ratio were 12.255 and 99.617,8.042,respectively.There was a very significant positive correlation between C,N and P;C:N ratio was controlled by C and N content,and C:P ratio and N:P ratio were controlled by C,N and P contents.The average values of C,N and P in the soil of 30-80 cm were 31.709 g/kg,2.995g/kg and 0.629 g/kg,respectively.The average values of C:N ratio,C:P ratio and N:P ratio were 10.586 and 61.322,5.351,respectively.There was also a very significant positive correlation between C,N and P;C:P ratio was controlled by C and N content,N:P ratio were controlled by C,N and P content,and C:N ratio was controlled by C content.?4?Altitude and leaf C content,C:N ratio,C:P ratio,litter N,P content,C:P ratio,0-30 cm layer soil C,N content,C:N ratio,N:P ratio,30-80 cm layer Soil C,N,P content,C:N ratio,C:P ratio showed significant or extremely significant correlation;MAT and leaf N content,C:N ratio,C:P ratio,0-30 cm layer soil C content,C:P ratio,N:P ratio,30-80 cm layer soil C,P content,C:P ratio,N:P ratio showed significant or extremely significant correlation;MAP and leaf C content,C:P ratio,0-30 cm layer soil C,N,P content,soil C content in 30-80 cm layer,C:P ratio,N:P ratio,C:N ratio showed significant or extremely significant correlation.?5?There was significant or extremely significant correlation between leaf P and litter C,P content,N:P ratio,0-30 cm layer soil C,P content,C:N ratio,leaf N:P ratio and litter C and P content.There was a significant or extremely significant correlation between P content and N:P ratio in N:P ratio and 0-30 cm layers.There was a significant linear negative correlation between leaf C:P ratio and litter P content,and litter N:P ratio.The P content in the soil of-30 cm layer showed a significant linear negative correlation.There was no significant change in the stoichiometric characteristics of the leaves and litter and the stoichiometric characteristics of the soil in the 30-80 cm layer.?6?Through redundancy analysis,it could be seen that in the 0-30 cm layer,CEC,slope and SWC explain the stoichiometric characteristics of leaves C,N and P significantly,and SWC explained the stoichiometric characteristics of litters C,N and P.Significantly;in the 30-80cm layer,CEC explained the stoichiometric characteristics of leaves C,N,and P significantly,and there was no significant correlation between physical and chemical factors and litter.In the 0-30 cm and 30-80cm layers,the degree of interpretation of soil C,N,and P stoichiometry was significant in SWC,CEC,and pH.?7?R_C3(C_soil?0-30?/C_litter)was positively correlated with MAP.R_N1(N_leaves/N_soil?0-30?)was positively correlated with MAP,R_N3(N_soil?0-30?/N_litter)was negatively correlated with altitude and positively correlated with MAT.R_P1(P_leaves/P_soil?0-30?)was negatively correlated with altitude and positively correlated with MAT.R_P3(P_soil?0-30?/P_litter)was positively correlated with MAP.