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Shanxi Normal University (2021)

Ecological Stoichiometry Characteristics of Plant-litter-soil under Different Vegetation Types in the Semi-arid Loess Small Watershed

温晨

Titre : Ecological Stoichiometry Characteristics of Plant-litter-soil under Different Vegetation Types in the Semi-arid Loess Small Watershed

Auteur : 温晨

Grade : Master 2021

Université : Shanxi Normal University

Résumé partiel
Ecological stoichiometry is an effective method to study the balance of elements and energy flow in the ecosystem.Defining the stoichiometry characteristics of plants and litter under different vegetation types,to clarify the changing laws of soil nutrient and stoichiometry ratios with soil depth,and to understand the interrelationship between plants,litter and soil nutrients is of great significance for revealing the nutrient conversion and balance mechanism of ecosystems during vegetation restoration on the Loess Plateau.It can provide a feasible basis for the selection of vegetation restoration types on the Loess Plateau.In this study,five vegetation types(Stipa bungeana grassland,Leymus secalinus grassland,Medicago sativa grassland,Caragana korshinskii shrub,and Armeniaca sibirica forest)in the semi-arid loess small watershed were selected as research objects.Analyzed the carbon(C),nitrogen(N),phosphorus(P)concentration and ecological stoichiometry characteristics of leaves,stems,roots,litter and soil under different vegetation types.The results showed that :(1)The nutrient concentration of each organ in the five typical vegetation was leaf >stem > root.The changes of C,N,P concentrations and stoichiometry ratio were significantly affected by the type of vegetation and the type of organ,respectively,but only the C and N concentrations were significantly affected by the interaction between the type of organ and the type of vegetation.Among different vegetation types,the C concentration in the leaf,stem,root and litter of A.sibirica was significantly highest,and S.bungeana was significantly lowest.The N concentration,N:P and litter C:P,N:P of C.korshinskii were significantly higher than those of other vegetation types.The C:N and C:P of leaf,stem and root respectively showed that L.secalinus had the highest significantly and C.korshinskii had the lowest significantly.Litter N,P,C:N had no significant differences among different vegetation types.Under all vegetation types,the concentrations of C,N,and P in leaves were higher than litter,and C:N,C:P and N:P showed that litter was higher than leaf.The nutrient reabsorption rate and nutrient utilization efficiency of the five typical vegetation of C,N,and P were the highest for P and the lowest for C.Among them,there was no significant difference in the nutrient resorption rate and nutrient use efficiency of C and P for different vegetation types.C.korshinskii and M.sativa had the highest N nutrient resorption rate,but the nutrient use efficiency were the lowest.

Mots clés : Loess Plateau ;plant organ ;vegetation type ;nutrient concentration ;internal stability ;ecological stoichiometry ;

Présentation (CNKI)

Page publiée le 21 octobre 2022