Chin J Plant Ecol

   

Changes of plant communites features and influencing factors in the enclosure and restoration in Horqin Sandy Land

WANG Mingming 1,LIiu Xinping LIiu XinpingLIiu Xinping2,He Yuhui He Yuhui1, 2,Wei Jing Wei Jing1,Chelmge Chelmge1,Sun Shanshan Sun Shanshan1   

  1. 1. Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences
    2.
  • Received:2019-03-26 Revised:2019-10-18 Online:2019-10-21 Published:2019-10-21
  • Contact: LIiu Xinping LIiu XinpingLIiu Xinping

Abstract: Aims Enclosure is one of the important measures for the restoration and reconstruction of degraded sandy grassland. Understanding the plant community change and its influencing factors of different habits under long-term enclosed state is beneficial to sandy vegetation restoration and ecological reconstruction. Methods This paper was aim to analyze changes of plant communities and its response to the variety of environment based on a long-term research (2005-2017) of plant communities on the mobile dunes enclosed in 2005, fixed dunes (1985) and sandy grassland (1997), and integrated with soil seed bank, soil nutrient and meteorological data. Important findings The results showed that the vegetation coverage and community species richness of mobile dune was significantly increased, but the community biomass was no obvious change trend. The biomass of fixed dune community, shrubs, semi-shrubs and the perennial legume functional group dominance decreased significantly, but the annual and perennial forbs dominance was increased significantly, which revealed the regressive succession was occurring in plant community. For grassland, the annual forbs were the dominated functional group, and community species richness and perennial grass dominance decreased significantly, which dominated the plant community is depredating. Additionally, the soil seed bank was no remarkable change in the three enclosed sandy land during 2008~2017 year. Only the soil available nitrogen and available phosphorus increased significantly, but the magnitude was not significant during 2008~2017 year. Regression analysis illustrated temperature and precipitation were the main factors affecting the accumulation of biomass during the year, but had little effect on the inter-annual biomass and species richness. Further, Detrended Correspondence Analysis (DCA) display that there is a high similarity between soil seed bank and plant community, and the typical correlation analysis (CCA) results elucidated that grassland community was closely related to soil nutrients, however, fixed dune community was mainly related to soil moisture. In summary, long-term enclosure is not only conducive to the restoration of degraded sandy vegetation, but also would lead to the regressive succession of community. It is very vital to gain a suitable time scale of enclosure for the restoration of degraded vegetation, therefore, we suggest the influence of degraded degree of vegetation, soil environment, climate conditions and other factors should be considered when we establish the time scale of enclosure, and cutting, grazing and some other disturbances should be carried out in the process of enclosure to maintain the continued restoration.

Key words: degraded Sandy Land, enclosed restoration, community variation, influencing factors

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