Abstract
Taking the alpine cold meadow grassland in the southeastern part of the Qinghai-Tibetan Plateau as an example, this research deals with the characteristics of alpine meadow soil property changes, including soil nutrients, soil physical properties and soil moisture content under different land coverage conditions. With the degradation of grassland vegetation and the decline of vegetation coverage, soil compactness reduces, gravel content increases and bulk density increases. The originally dense root-system layer is gradually denuded, making the soil coarse and gravel. The change of the organic matter contents with the vegetation coverage change in the surface soil layer (0–20 cm) has shown an obvious cubic polynomial curve process. The organic matter contents increase rapidly when land coverage is above 60%, contrarily decreases on a large scale when land coverage is below 30%. Between 30%–60% of land coverage the organic matter contents remain stable. The total N and organic matter contents in soil have shown quite similar change regularity. Following this the mathematic equations are derived to describe such change processes. Moisture content in soil changes sharply with the vegetation coverage change. Soil moisture content change with the vegetation coverage change has shown a quadratic parabola process. Results have shown that organic matter content and the total N content of the alpine meadow soil decrease by 14890 kg/hm2 and 5505 kg/hm2 respectively as the vegetation coverage reduces from 90% to less than 30%. The heavy changes of soil physical and chemical properties with grassland degradation have made the recovery of alpine meadow ecological system impossible. The protection of alpine meadow vegetation is of vital importance to the maintenance of the regional soil environment and the regional ecological system.
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References
Turner, B. L., Skole, D., Sanderson, S. et al., Land-use and land-cover change: science/research plan, IGBP Report 35/HDP Report 7, Stockholm and Geneva, 1995, 12–120.
Li, X., The international tendency of the hard core of global changes—LUCC research, Acta Geographical Sinica (in Chinese), 1996, 51(6): 553.
Gong, Z., Chen, H., Luo, G., Influences of anthropogenic factors on soil environ mental quality and the countermeasures, soil environmental quality and the countermeasures, Journal of Soil and Environment (in Chinese), 2000, 9(1): 7.
Wang, X., Gong, Z., Assessment and prediction of soil changes in red soil hilly region, Acta Pedological Sinica (in Chinese), 1998, 35(1): 135.
Shi, P., Gong, P., Li, X. et al., On The Methodology and Practice of LUCC Research (in Chinese), Beijing: Science Press, 2001, 11–43.
Lai, R., Soil erosion and land degradation: the global risks, Adv. Soil Sci. 1990, 11: 169.
Hillel, D., Research in soil physics: a review, Soil Sci., 1991, 151: 30.
Zhang, L., Dawas, W. R., Reece, P. H., Response of mean annual evapotranspiration to vegetation changes at catchments scale, Water Resource, Res., 2001, 37(3): 701.
Chapman, P. J., Edwards, A. C., Reynolds, B., The nitrogen composition of streams draining grassland and forested catchments, Collection in Impact of Land-Use Change on Nutrient Loads From Diffuse Sources (ed. Heathwaite, L.), IAHS Publ. No. 257, 1999, 17–26.
Withers, P. J. A., Dils, R M., Transfer of phosphorus from small agricultural basins with variable soil types and land use, Collection in Impact of Land-Use Change on Nutrient Loads From Diffuse Sources (ed. Heathwaite, L.), IAHS Publ. No. 257, 1999, 41–50.
Li, W., Zhou, X., Ecosystem and Optimization Utilization Pattern of Qinghai-Tibetan Plateau (in Chinese), Guangzhou: Guangdong Science and Technology Press, 1998, 19–67.
Wang, G., Cheng, G., Shen, Y. et al., Research on Eco-environmental Changes in Changjiang-Yellow River Source Regions and Their Integrated Protections (in Chinese), Lanzhou: Lanzhou University Press, 2001, 47–62.
Lu, R., Soil and Vegetation Trophic Science (in Chinese), Beijing: Chemical Industrial Press, 1998, 45–67.
Zhou, X., ChineseKobresia Meadow Vegetation (in Chinese), Beijing: Science Press, 2001, 188–206.
Liu, W., Wang, Q., Wang, X. et al., Causes and ecological processes of “Black Soil Type” degradation of alpine cold meadow grassland, Journal of Grassland (in Chinese), 1999, 7(4): 300.
Kang, E., Cheng, G., Lan, Y. et al., The conceptual hydrological model and its usage in forecasting the runoff out of mountains in northwestern China, Advances of Geological Science (in Chinese), 2002, 17(1): 18.
Wang, G., Qian, J., Cheng, G., Eco-environmental degradation and causal analysis in the source region of the Yellow River, Environmental Geology (in Chinese), 2001, 40(7): 884.
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Wang, G., Cheng, G., Shen, Y. et al. Influence of land cover changes on the physical and chemical properties of alpine meadow soil. Chin. Sci. Bull. 48, 118–124 (2003). https://doi.org/10.1007/BF03037014
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DOI: https://doi.org/10.1007/BF03037014