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Shandong Agricultural University (2019)

Response of Three Plant Functional Character and Water Physiological Ecology to Degradation Degree of Desert Grassland

韩秀峰;

Titre : Response of Three Plant Functional Character and Water Physiological Ecology to Degradation Degree of Desert Grassland

Auteur : 韩秀峰;

Grade : Master’s Theses 2019

Université : Shandong Agricultural University

Résumé partiel
Grassland ecosystem is an important part of terrestrial ecosystem in China.Grassland degradation caused by grazing has attracted much attention.Overgrazing strongly affects the pattern and process of grassland ecosystem,and causes the continuous decline of grassland productivity and ecosystem services.The change of plant functional traits is a comprehensive manifestation of plants adapting to environmental changes.Analyzing the changes of plant functional traits in grasslands with different degraded degrees helps to clarify the mechanism of grazing on grassland productivity and ecosystem functions,and has guiding significance for scientific management of grasslands and ecological restoration of degraded grasslands.Sheramoren desert grassland is seriously degraded due to overgrazing.Its productivity and biodiversity decrease,and its ecosystem service function decreases.Taking three common plant species S.breviflora,C.squarrosa and C.ammannii in grassland with different degraded degrees as research objects,the changes of functional traits,photosynthetic physiology and plant interception characteristics of three plants under different degraded degrees were studied by means of field investigation and indoor research.The responses of three plant functional traits to the degraded degree of grassland were clarified,and the photosynthesis and interception characteristics of three plants under different degraded degrees were revealed.The effects of grassland degradation degree and plant morphology on water use efficiency and plant interception were clarified in order to provide theoretical basis for rational utilization of grassland resources and scientific grazing.The main research results show that :(1)Indicators of individual plant functional traits of the three plants decreased with the aggravation of grassland degradation.Grassland degradation had a greater impact on plant height of S.breviflora and C.ammannii,with 49.1% and 48.8% decrease in plant height and 32.2% decrease in C.squarrosa,respectively.The biomass of S.breviflora changed greatly with the increase of grassland degradation,and decreased by 42.3%.The biomass of C.ammannii changed significantly in moderate and severe degraded plots.Grassland degradation changed the distribution of aboveground substances,and the ratio of stem to leaf decreased.

Mots clés : Desert grassland; Degradation degree; Plant functional characteristics; Water use efficiency; Interception;

Présentation (CNKI)

Page publiée le 1er mai 2020