Grazing‐induced alterations of soil hydraulic properties and functions in Inner Mongolia, PR China
Tóm tắt
Increasing grazing intensities of sheep and goats can lead to an increasing degradation of grasslands. We investigated four plots of different grazing intensities (heavily grazed, winter‐grazed, ungrazed since 1999, and ungrazed since 1979) in Inner Mongolia, PR China, in order to study the effects of trampling‐induced mechanical stresses on soil hydraulic properties. Soil water transport and effective evapotranspiration under “heavily grazed” and “ungrazed since 1979” were modeled using the HYDRUS‐1D model. Model calibration was conducted using data collected from field studies. The field data indicate that grazing decreases soil C content and hydrophobicity. Pore volume is reduced, and water‐retention characteristics are modified, the saturated hydraulic conductivity decreases, and its anisotropy (vertical
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Tài liệu tham khảo
Allen R. G. Pereira L. S. Raes D. Smith M.(1998): Crop evapotranspiration. Guidelines for Computing Crop Water Requirements. Irrigation and Drainage Paper No. 56 FAO Rome p. 300.
De Bano L.(1981): Water Repellent Soils: A State of the Art. United States Department of Agriculture Forest Service Pacific Southwest Forest and Ranae Experiment station General Technical Report PSW‐46. Publisher: Pacific Southwest Forest and Range Experiment Station P.O. Box 245 Berkeley California USA.
FAO(2006): World reference base for soil resources (2006): A framework for international classification correlation and communication. World Soil Resources Reports 103 2006 edition Food and Agriculture United Nations Rome 2006.
Gebhardt S. Fleige H. Horn R.(2006): Stress‐deformation behavior of different soil horizons and their change in saturated hydraulic conductivity as a function of load. Advances in GeoEcology 38 Catena Verlag Reiskirchen pp. 86–92.
Hartge K. H. Horn R.(1992): Die physikalische Untersuchung von Böden. Ferdinand Enke Verlag Stuttgart Germany.
Kutilek M. Nielsen D. R.(1994): Soil Hydrology. Catena Reiskirchen.
Krümmelbein J. Wang Z. Zhao Y. Peth S. Horn R.(2006): Influence of various grazing intensities on soil stability soil structure and water balance of grassland soils in Inner Mongolia P.R. China. Advances in GeoEcology 38 Catena Verlag Reiskirchen pp. 93–101.
Peth S. Horn R.(2006): Consequences of Grazing on Soil Physical and Mechanical Properties in Forest and Tundra Environments in Forbes B. C. Bölter M. Müller‐Wille L. Hukkinen J. Müller F. Gunslay N. Konstatinov Y. (eds.): Reindeer Management in Northernmost Europe. Vol. 184 Springer Berlin Germany pp. 217–243.
Scheffer F. Schachtschabel P.(2002): Lehrbuch der Bodenkunde. Spektrum Akademischer Verlag Heidelberg Berlin Germany.
Schlichting E. Blume H.‐P. Stahr K.(1995): Bodenkundliches Praktikum. Blackwell Wissenschafts‐Verlag Berlin Wien.
Shao Y.(2001): Physics and Modelling of Wind Erosion. Kluwer Academic Publishers Dordrecht The Netherlands.
Šimůnek J. Sejna M. van Genuchten M. Th.(1998): The HYDRUS‐1D software package for simulating the one dimensional movement of water heat and multiple solutes in variably‐saturated media. Version 2.0. IGWMC‐TPS‐70. Int. GroundWater Modeling Center Colorado School of Mines Golden Colorado USA.
Trnka M., 2005, Grassland statistical yield modelling with focus on “dry” seasons., Mitt. Ges. Pflanzenbauwiss., 17, 215
van Genuchten M. Th. Leij F. J. Yates S. R.(1991): The RETC code for quantifying the hydraulic functions of unsaturated Soils. Ver. 1.0 EPA Rep. 600/2–91/065. U.S. Salinity Lab. USDA‐ARS Riverside CA USA.
White R. P. Murray S. Rohweder M.(2000): Pilot Analysis of Global Ecosystems: Grassland Ecosystems. World Resources Institute Washington D.C.