Study On Ecological Stoichiometric Characteristics Of Herbaceous Plants On The North Slope Of Western Tianshan Mountains

The ecological stoichiometry of plants not only reflects the ability of plants to absorb and store mineral nutrients from the soil matrix under certain environmental conditions,but also reflects the stoichiometric distribution characteristics of plants formed by long-term adaptation to the surrounding environment.Carbon(C),nitrogen(N),and phosphorus(P),as essential nutrients for plant growth and development,affect plant growth and development and their behavioral processes.In this study,herbaceous plants on the northern slope of the western Tianshan Mountains were used as research objects.The characteristics of C,N,P content and their eco-stoichiometry ratios were explored.The relationship between the leaves of herbaceous plants and environmental factors was analyzed using redundant analysis(RDA).It helps to explain the nutrient cycling process and interaction mechanism among herbaceous plants C,N,and P,and the response to different plant habitats.The main findings are as follows:(1)The average values of the C,N,and P contents of the leaves of the herbaceous plants on the northern slope of the Western Tianshan Mountains were 329.26 g / kg,27.98 g / kg,and 2.93 g / kg,respectively.The average values of the C:N ratio,C:P ratio,and N:P ratio is 11.58,106.82,and 9.39,respectively.The growth and development of herbaceous plants on the northern slope of the western Tianshan Mountains is mainly limited by the content of N.The C:N ratio,C:P ratio,and N:P ratio of plant leaves is mainly affected by the C,N,and P content.The N:P ratio is affected by N,P Content control.(2)The difference in C content among different functional groups of herbaceous plants on the northern slope of the western Tianshan Mountains has different degree significant.Labiatae have the highest C content,and the Compositae has the lowest;Leguminosae have the highest N content,Cruciferae have the highest P content,and Poaceae have the lowest N and P content.Poaceae has the highest C:N ratio and Leguminosae has the lowest;Poaceae has the highest C:P ratio and Cruciferae has the lowest;Leguminosae has the highest N:P ratio and Compositae has the lowest.Poaceae's organic matter decomposes slowly,leguminous nitrogen fixation is significant,and there are differences in nutrient utilization among different functional groups.(3)The C,N and P contents of the herbaceous plants on the northern slope of the West Tianshan Mountain have different degrees of difference among different life forms.The therophyte and biennial have the highest C and N content,and the therophyte has the lowest N content and the lowest P content.The difference in the demand for C,N,and P elements by plants of different life forms is not significant,which reflects the relative uniformity of the plant's selective absorption of elements.therophyte has the highest C:N ratio and biennial has the lowest;perennial has the highest C:P ratio and biennial has the lowest;perennial has the highest N:P ratio and biennial and perennial have the lowest.There are differences in leaf nutrient utilization between different life forms,and the nutrient utilization efficiency of each life form is not related to the synthesis of organic matter.(4)Redundant analysis of contents of C,N,P of Herbaceous Plants on the North Slope of the Western Tianshan Mountains and their Ecological Stoichiometry with environmental factors,and their impacts are ranked as soil organic carbon content(SOC)> annual average precipitation(MAP)> Soil cation exchange capacity(CEC)>Soil bulk density(BD)> Soil pH value > Soil moisture content(SWC)> Average temperature(MAT)> Elevation.The C and P contents of herb leaves did not change significantly with elevation,and the N contents decreased with elevation.C,N,P,and MAT are all significantly positively correlated,and N and MAP are significantly positively correlated.The C,N,and P contents of herb leaves are significantly positively correlated with SOC,indicating that changes in soil nutrient supply can affect the element absorption and utilization of plant leaves to a certain extent;leaf N and SWC are significantly positively related,indicating that the soil moisture content Increasing can promote the absorption of N by the leaves of herbaceous plants in the western Tianshan Mountains;pH value does not provide a good explanation for the variation of leaf element content characteristics,indicating that the growth and development of herbaceous plant leaves on the northern slope of the western Tianshan Mountains is not significantly limited by soil pH.