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[1]SHENG Hanyuan,ZHAI Linbo,CAO Jiayi,et al.Characteristics of Grassland Community and Its Ethnological Response in Loess Hilly Regions Under Simulated Precipitation Change[J].Research of Soil and Water Conservation,2022,29(06):146-153.

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Characteristics of Grassland Community and Its Ethnological Response in Loess Hilly Regions Under Simulated Precipitation Change

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 06 Page number: 146-153 Column: Public date: 2022-10-20

Title:: Characteristics of Grassland Community and Its Ethnological Response in Loess Hilly Regions Under Simulated Precipitation Change

Author(s):: SHENG Hanyuan¹, ZHAI Linbo¹, CAO Jiayi¹, JIAO Feng^1,2; (1.College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China; 2.Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China)

Keywords:: precipitation change; ethnological response; grassland community; Less Hilly Area

CLC:: P426; Q948

DOI:: -

Abstract:: Under the background of global climate change, the precipitation pattern of the Loess Plateau shows a trend of increasing seasonal fluctuations and increasing extreme precipitation events. The change of precipitation patterns are bound to cause important changes in the grassland community characteristics and phenology period. In order to study the response of the grassland ecosystem in the Loess hilly area, the grassland in the hilly area of the Loess Plateau were selected as the research object. the study observed the dynamic change of phenology(0, ±20%, ±40%, ±60%)in the natural recovery community, and explored the response of phenology and precipitation to community structure. The results showed that:(1)Different species composition and abundance under different precipitation conditions, and improved species composition compared with control groups. Species in communities with 60% rain were the largest of 18 species.(2)Precipitation gradient treatment, along with the community cover increased first before decreasing, and the aboveground biomass followed by unimodal trend. Both 20% precipitation treatment and 20% precipitation treatment groups can significantly improve community vegetation cover and aboveground biomass, where aboveground biomass was significantly higher than that under rain reduction treatment.(3)Both the richness and the Shannon-Wiener index showed an overall upward trend, with rain losses of 20%, 40%, and 60% all reducing the Pielou uniformity index.(4)Different precipitation conditions have significant effects on the species phenological period(p<0.001)and the community rejuvenation period. Breeding and dry yellow periods were significantly advanced under rain reduction treatment, while rain increase treatment delayed the breeding and dry yellow periods. The results of this study are expected to provide reference for vegetation restoration and grassland resources development and utilisation in the Loess Plateau. In this paper, the results showed that the community species composition, vegetation cover and aboveground biomass showed significant differences under different precipitation treatments, while species diversity was insensitive to precipitation change responses.

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Last Update: 2022-10-20