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[1]MIAO Fan,YANG Xinguo,GU Junlong,et al.Effect of Grazing on the Properties of Surface Soil in the Land Growing Stipa breviflora[J].Research of Soil and Water Conservation,2019,26(03):49-57.

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Effect of Grazing on the Properties of Surface Soil in the Land Growing Stipa breviflora

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 03 Page number: 49-57 Column: Public date: 2019-04-12

Title:: Effect of Grazing on the Properties of Surface Soil in the Land Growing Stipa breviflora

Author(s):: MIAO Fan^1,2,3, YANG Xinguo^1,2,3, GU Junlong^1,2,3, YANG Dongdong^1,2,3; 1. Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in North-Western China, Ministry of Education, Yinchuan 750021, China;
2. Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration of Northwestern China, Ningxia University, Yinchuan 750021, China;
3. Union Research Center for Ecological and Exploitation of Biological Resources in Western China, Ningxia University, Yinchuan 750021, China

Keywords:: spatial distribution; plexus edge; bare spot outside plants; soil properties; Stipa breviflora; grazing interference

CLC:: S154.1

DOI:: -

Abstract:: In order to reveal the role of small-scale plants-soil interactions in maintaining grassland stablity, we used the grazing degraded Stipa breviflora grassland as the site and the adjacent fenced grassland as the control (CK) to compare and analyze the spatial distribution of particle sizes and nutrient characteristics of surface soil in the small-scale on the plexus edge (inside of the plant community) and the bare spot (outside of the plant community) of Stipa breviflora under the grazing disturbance, and spatial changes in their correlation. The results showed that:(1) in general, the distribution pattern of clay (<2 μm) was opposite to that of and sand (50~2 000 μm), showing a significantly negative correlation between clay and sand, and enclosure significantly increased soil clay content, decreased and sand content and silt content (2~50 μm) significantly (p<0.05); the distribution of organic carbon (SOC) and clay was consistent, total nitrogen (TN) did not significantly change; and there is no significant difference between the inside and outside of the plant community; (2) enclosure significantly increased and significantly reduced soil clay and sand in any soil layer divided by 2 cm interval; the silt content of 0-8 cm soil layer was significantly low (p<0.05); the SOC in 2-8 cm and 12-14 cm soil layers were significantly improved, and TN had no significant change, but the presence of planting clumps significantly improved SOC content of 0-4 cm soil layer (p<0.05) inside of the enclosed area; (3) with the vertical change of soil layer, the content of clay in the enclosed area gradually increased, and the contents of silt and sand gradually decreased; SOC and TN did not change significantly (p>0.05); the content of caly increased significantly, and the content of silt gradually decreased in 12-14 cm soil layer in the grazing area, the content of sand increased first and then decreased (p<0.05). The SOC accumulation in the surface layer of soil, and the contents of TN presented the V-shape distribution, and was lowered in the middle soil layer inside the plant community, and did not significantly change outside the plant community (p>0.05); the correlation between the particle sizes in the enclosed area was basically stable, and the correlation between the particles in some soil layers was not significant in the grazing area. There was no significant correlation between particle sizes and SOC and TN in the enclosed area (p>0.05); the significant correlation between particle sizes and SOC was found in 10-14 cm soil layer, and the significant correlation between particle sizes and TN was observed in 8-14 cm soil layer in grazing area. In short, grazing disturbance not only led to change of soil texture and a significant decline of nutrient levels, but also changed the interrelationship between different soil physical and chemical indicators and their distribution pattern, but the soil texture and nutrient status were not significantly improved by the plants.

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