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38 physical characteristics. Soil Till. Res. 35, 199-210. Qiu, Y., Fu, B.J., Wang, J., Chen, L.D., 2001. Spatial variability of soil moisture content and its relation to environmental indices in a semi-arid gully catchment of the Loess Plateau, China. J. Arid Environ. 49, 723-750. Richard, G., Cousin, I., Sillon, J.F., Bruand, A., Guérif, J., 2001. Effect of compaction on the porosity of a silty soil: influence on unsaturated hydraulic properties. Eur. J. Soil Sci. 52, 49-58. Ritsema, C.J., Dekker, L.W., 1996. Influence of sampling strategy on detecting preferential flow paths in water-repellent sand. J. Hydrol. 177, 33-45. Rumpel, C., Knicker, H., Kögel-Knabner, I., Skjemstad, J., Hüttl, R.F., 1998. Types and chemical composition of organic matter in reforested lignite-rich mine soils. Geoderma 86, 123-142. Samper, F.J., Carrera, J., 1990, Geoestadística-Aplicaciones a la hidrogeología subterránea: CIMNE. Barcelona, Spain, 484 pp. Shouse, P.J., Russell, W.B., Burden, D.S., Swlim, H.M., Sisson, J.B., van Genuchten, M.Th., 1995. Spatial variability of soil water retention functions in a silt loam soil. Soil Sci. 159(1), 1-12. Täumer, K., Stoffregen, H., Wessolek, G., 2005. Determination of repellency distribution using soil organic matter and water content. Geoderma 125, 107-115. Warren, S.D., Nevill, M.B., Blackburn, W.H., Garza, N.E., 1986. Soil response to trampling under intensive rotation grazing. Soil Sci. Soc. Am. J. 50, 1336-1340. Western, A.W., Blöschl, G., 1999. On the spatial scaling of soil moisture. J. Hydrol. 217, 203-224. Western, A.W., Blöschl, G., Grayson, R.B., 1998. Geostatistical characterisation of soil moisture patterns in the Tarrawarra Catchment. J. Hydrol. 205, 20-37. Willatt, S.T., Pullar, D.M., 1984. Changes in soil physical properties under grazed pastures. Aust. J. Soil Res. 22(3), 343-348. Zhang, R., 1997. Determination of soil sorptivity and hydraulic conductivity from the disk infiltrometer. Soil Sci. Soc. Am. J. 61, 1024-1030.
Chapter 3 Spatio-temporal variability of soil moisture in grazed steppe areas investigated by geostatistics 3. Spatio-temporal variability of soil moisture in grazed steppe areas investigated by multivariate geostatistics Y. Zhao, S. Peth, R. Horn, P.D. Hallett, X.Y. Wang, M. Giese, Y.Z. Gao Revision for Journal of Hydrology. Abstract Land use has a significant impact on spatio-temporal soil moisture patterns, particularly in sensitive and poorly managed regions such as the grassland of Inner Mongolia. This study identified the factors that control soil moisture patterns under different grazing intensities in the semi-arid Xilin River Catchment, Inner Mongolia, China. Five different levels of sheep grazing intensity were sampled for various soil and vegetation properties at high spatial and temporal resolution during 2004-2006: (1) ungrazed since 1979 (UG 79); (2) ungrazed since 1999 (UG 99); (3) winter grazed only, with 0.5 sheep units (ewe and lamb) ha -1 yr -1 (WG); (4) continuously grazed, with 1.2 sheep units ha -1 yr -1 (CG); and (5) heavily grazed, with 2.0 sheep units ha -1 yr -1 (HG). The data were analyzed using correlation and geostatistical analysis. Results showed that spatial variance and, to a lesser extent, the correlation length were related to mean soil moisture content. Under different grazing intensities, (a) soil moisture patterns had weak to moderate spatial structures with typical correlation lengths ranging from 20 to 178 m; (b) soil and plant properties were the main factors controlling the distribution of soil moisture; and (c) factorial kriging analysis further revealed scale-dependent correlation structure of the controlling parameters. Specifically, the soil and plant properties strongly controlled the variation of soil moisture for UG 99 at short-scale (90 m), for CG at long-scale (165 m) and for HG at averaged random, short-scale and long-scale components, however, weakly controlled the variation of soil moisture for UG 79 at the micro-scale (random;
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SCHRIFTENREIHE Institut für Pflanz
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Aus dem Institut für Pflanzenernä
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I Table of contents I Table of cont
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Chapter 5 Modeling Grazing Effects
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Chapter 6 Modeling of Coupled Water
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Chapter 7 General discussion and co
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References Chapter 7 General discus
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8. ACKNOWLEDGMENTS Firstly I would
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Curriculum Vitae M.Sc. Ying Zhao Of
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Schriftenreihe des Instituts Neuere
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