灵武白芨滩不同年限柠条固沙林林下草本群落演替规律及机制OA北大核心CSTPCD

This research explored the relationship between the succession sequence of the understory plant community and environmental factors in Caragana korshinskii plantations.We investigated the herbaceous communities in C.korshinskii forests of different ages(3,5,10,20,30,40,50,60 and 70 years)and determined the soil physical and chemical properties.Two-way indicator species analysis(TWINSPAN),detrended correspondence analysis(DCA)and redundancy analysis(RDA)were used for quantitative classification and sequencing.The relationship between community distribution and environmental factors was analyzed.It was found that:1)27 quadrats in nine plots were divided into a series of four community types by TWINSPAN:Corispermum mongolicum+Agriophyllum squarrosum community→Psammochloa villosa+Artemisia sphaerocephala community→Setaria viridis+Chenopodium album community→Artemisia scoparia+Stipa breviflora community.2)The results of TWINSPAN and DCA were consistent,and DCA further confirmed the rationality of the TWINSPAN classification.3)According to the RDA,soil organic carbon and soil pH value were the environmental factors that significantly affected the distribution of the herbage community under the C.korshinskii forest,explaining 19.3%and 13.6%,and contributing 37.5%and 26.5%(P<0.05).This research identifies the species succession and its driving factors in the understory herbaceous community in the sand-fixing forest of Baijitan.The results provide a theoretical basis for desertification control and scientific management of the Baijitan nature reserve.