Grazing impact on distribution pattern of the plant communities and populations in Stipa krylovii steppe

Abstract

Abstract: A continuous period of four years (2006-2009 years) rotational grazing experiment was carried out on Stipa krylovii steppe in the central part of Inner Mongolia in the summer and autumn. With combination of photography and geographic information systems, we had studied ecological effects of grazing on the distribution pattern of plant populations and communities in different grazing intensities experimental plots. The photographic images and experimental data showed that there had formed patches with different sizes and structures in different grazing areas, also the gradient sequence of communities and population and plant production were caused by a different cycle and intensity of grazing. However, the patches in no-grazing enclosed control area(G5) were still original Ass.S. krylovii and Ass. Leymus chinensis. The percentage of the number and area of patches、the plants composition and above-ground biomass were all relatively stable in G5. In different grazing intensity experiments plots(G1、G2、G3),there formed different gradient on the number, area, population structure, plant abundance, circumference and above-ground biomas. Ass.S. krylovii and population patch become fragmentation and individual plant become miniaturization due to different grazing intensity. Moderate grazing makes the patch structure and above-ground biomass emerge in the effects of compensatory growth of plants. This study showed that the changes of plant patch structure in community and population pattern were the basic for population colonization and recession during grassland succession, and also the mechanism for the succession of grassland plant communities.

CLC Number:

ZHAO Deng-liang, LIU Zhong-ling, YANG Gui-xia, XIN Xiao-ping, LIANG Cun-zhu, WANG Wei, WANG Li-xin. Grazing impact on distribution pattern of the plant communities and populations in Stipa krylovii steppe[J]. Acta Prataculturae Sinica, 2010, 19(3): 6-13.

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