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corresponding to the different scales (Table 5), we found that the total spatial variation of soil moisture was mostly dominated by variations of soil variables within a short-range scale in UG 99, CG and HG, but a long-range scale in UG 79 and WG. SWC had a positive correlation with organic carbon, whereas a negative correlation with either sand content or bulk density, which was consistent with single scale analysis. Noted that sand content was the main soil variable controlling SWC, as shown by the high correlation coefficient at different spatial scales. Table 3.5. Structural correlation coefficients between soil moisture and soil and plant properties at short- and long-range scales for different grazing intensities Treat- Scale Soil Plant ment Sand SOC BD VC AGB UG79 Short -0.59 0.18 -0.16 -1.00 -1.00 Long 0.53 0.27 -0.32 0.84 0.53 UG99 WG CG HG Short -1.00 1.00 -1.00 1.00 1.00 Long 0.26 -0.22 0.23 -0.45 -0.77 Short -0.02 0.10 0.08 0.05 0.99 Long -0.51 -0.98 -0.24 -0.53 -0.99 Short -0.98 0.32 -0.28 -1.00 -1.00 Long 1.00 0.18 -0.06 0.46 0.41 Short -1.00 1.00 -1.00 0.81 -0.64 Long 0.52 -0.39 0.12 -0.86 0.76 Sand: sand content (%); SOC: soil organic carbon (g kg -1 ); BD: bulk density (g cm -3 ); VC: vegetation coverage (%); AGB: above ground biomass (g m -2 ). The coregionalization analysis of plant variables, i.e. VG and AGB, also included three basic spatial structures: nugget effect (
Chapter 3 Factors controlling spatio-temporal variability of soil moisture using multivariate geostatistics water redistribution are scale-dependent. Therefore, it is critical to define the spatial scale of a simulation model when devising a sampling scheme. Table 3.6. Structural variation contributions of each component to the total variation (%) at different spatial scales for different grazing intensities Treat- Scale Soil Plant ment Moisture Sand SOC BD VC AGB UG79 Nugget 73% 0% 62% 62% 93% 56% Short 7% 100% 0% 0% 0% 44% Long 20% 0% 38% 38% 7% 0% UG99 WG CG HG Nugget 31% 0% 20% 31% 69% 72% Short 69% 3% 80% 69% 0% 0% Long 0% 97% 0% 0% 31% 28% Nugget 82% 0% 21% 14% 33% 0% Short 18% 0% 0% 0% 67% 0% Long 0% 100% 79% 86% 0% 100% Nugget 39% 0% 65% 44% 0% 22% Short 0% 0% 6% 56% 0% 0% Long 61% 100% 29% 0% 100% 78% Nugget 30% 8% 51% 84% 67% 61% Short 34% 39% 49% 16% 33% 39% Long 37% 53% 0% 0% 0% 0% Sand: sand content (%); SOC: soil organic carbon (g kg -1 ); BD: bulk density (g cm -3 ); VC: vegetation coverage (%); AGB: above ground biomass (g m -2 ). The structural variation contributions of each component to the total variation are shown in Table 6. The variation of soil moisture was dominated by nugget effects in UG 79 and WG, the short-range scale component in UG 99, long-range scale component in CG, and averaged random, short- and long-range scale components in HG. As found for the structural correlation coefficients, the variations of soil and plant variables were basically consistent with that of SWC at different spatial scales. The weak correlations between soil moisture and plant properties in the two ungrazed sites may be further explained by the high nugget variations of plant properties. This difference could be due to grazing intensity as the regionalized variables had a more heterogeneous spatial distribution in the 57
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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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controlling soil moisture are of pa
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Zusammenfassung Überweidung wird a
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Die Beweidung beieinflusst besonder
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II List of figures Fig. 2.1. Locati
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measured soil moisture in time stab
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III List of tables Table 2.1. Descr
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1.1 Background Chapter 1 Introducti
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Chapter 1 Introduction is also unce
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Page 29 and 30: Chapter 1 Introduction Krümmelbein
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Page 85 and 86: Chapter 4 Temporal stability of soi
Page 89 and 90: Y orientation Chapter 4 Temporal st
Page 93 and 94: MRD(%) MRD(%) 100 80 60 40 20 0 -20
Page 101 and 102: Soil water content (%) 40 30 20 10
Page 105 and 106: Chapter 5 Modeling Grazing Effects
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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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