| Biology and Soil |
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| Micro-scale Spatial Heterogeneity of Vegetation Community and Soil Organic Matter under Different Grazing Intensities |
| WU Yun-na1, LUO Wen-tao1,2, HUO Guang-wei1,2, L Jian-zhou2, LI Hai-shan3, HU Gao-wa3 |
1.College of Environmental and Resource Sciences, Dalian Nationalities University, Dalian 116605, Liaoning, China;
2.College of Life Science, Liaoning Normal University, Dalian 116029, Liaoning, China;
3.Grassland station of New Barag Right Banner, New Barag Right Banner 021300, Inner Mongolia, China |
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Abstract Both vegetation pattern and population process have relationship with spatial heterogeneity. In this study, we compared the spatial distribution of the aboveground biomass and soil organic matter in three communities of Stipa krylovii steppe under different grazing intensities. The vegetation community compositions vary with different grazing pressures. The dominant species are Stipa krylovii, Cleistogenes squyarrosa, and Allium polyrhizum in the light, moderate, and heavy grazing communities, respectively. There are eight plant species in the light grazing community, twelve plant species in the moderate grazing community, and seven plant species in the heavy grazing community. (2) Both the aboveground biomass and its variation coefficient decrease with increase of grazing intensity; the sequence of soil organic matter content within 10 cm depth is, light grazing>moderate grazing>heavy grazing and the variation coefficient of soil organic matter is ranked as: moderate grazing>light grazing>heavy grazing. (3) Geostatistical analysis results show that the spatial heterogeneity of aboveground biomass increases with the increase of grazing intensity, and the spatial heterogeneity of soil organic matter within 10 cm depth is ranked as: moderate grazing > light grazing>heavy grazing. (4) At 10 cm×10 cm spatial scale, there is significant correlation between the aboveground biomass and the soil organic matter contents only in the heavy grazing site (P<0.05).
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Received: 09 October 2011
Published: 20 July 2012
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2012, Vol. 32 
