SCHRIFTENREIHE Institut für Pflanzenernährung und Bodenkunde ...

Recommendations

Info

that firstly the complex and dynamic interaction of soil properties influencing plant growth often remains unidentified, and secondly spatial auto- and cross-correlations of soil properties is usually ignored. This chapter serves to close this gap by performing a combined analysis of soil hydraulic and mechanical processes as well as their spatial variation. Therefore, our objectives are (i) to estimate the effect of grazing intensity on soil mechanical and hydraulic properties on the plot scale; (ii) to investigate the spatial variability of soil properties in the surface soil; and (iii) to explore correlations between soil properties. Chapter 3: “Spatio-temporal variability of soil moisture in grazed steppe areas investigated by multivariate geostatistics” Spatio-temporal soil moisture patterns are not only f<strong>und</strong>amentals for a spatially distributed hydrological modeling, but also keystones for the exploration of hydraulic processes and mechanisms in site-specific ecosystems. Identification of factors that control soil moisture spatio-temporal patterns is therefore important. The role of controlling factors of soil moisture is either unclear or even contradicting between different studies. It is reasoned for the lack of consistent soil moisture sampling in both space and time and of comprehensive data sets of possible controlling factors. For this approach, a combined grided and nested sampling of topsoil moisture and various environmental attributes was conducted at five sites during the growing seasons of 2004-2006. The objectives of this study are (i) to quantify the spatio-temporal variability of topsoil soil moisture as affected by grazing intensity, (ii) to ascertain the main factors controlling soil moisture patterns in semiarid environment, and (iii) to explore the multivariate spatial scale of controlling factors by multivariate and geostatistical approaches. Chapter 4: “Temporal stability of soil moisture in a semi-arid steppe and its application in model result validation” The high spatial variability of soil moisture and the small measurement support 6
Chapter 1 Introduction requires therefore appropriate sampling strategies and monitoring (or modeling) sites. The temporal stability concept might aid to estimate field mean water content whether hydrological model is applied in a time stability point. However, until now this has not been fully used and tested to estimate the water content and flux for a given probability level by a hydrological model. The purposes of this study are: i) to investigate the temporal stability of soil moisture <strong>und</strong>er different water conditions, ii) to explore the grazing impact on temporal stability of soil moisture, and iii) to infer how far the time stability concept can be applied for the hydrological model to make reliable estimates of soil moisture. Chapter 5: “Modeling grazing effects on coupled water and heat fluxes in Inner Mongolia grassland” What are the grazing influences on soil bulk density, crusting, aggregation and hydrophobic features? How do parameters like soil texture, water retention properties and infiltration capacity change the modeling results of soil water movement? In this paper, in situ measurements of soil, plant and weather data were used to parameterize the model HYDRUS-1D, by which water and heat fluxes were simulated as a function of grazing intensity. The modeling results were verified by comparison with the measured data of soil water and temperature. The objectives of this study are (i) to quantify water and heat budgets affected by grazing intensity via calibrating HYDRUS-1D, and (ii) to define water use mechanisms in Inner Mongolia grassland. Chapter 6: “Modeling of Coupled Water and Heat Transfer in Freezing and Thawing Soil” In this study, we further address the field application of a new freezing code incorporated into HYDRUS-1D, which numerically solves coupled equations governing phase changes between water and ice, and heat transport with a mass- and energy-conservative method. The seasonally frozen soils in Inner Mongolia allow us to evaluate the effect of snowmelt and soil thawing water on surface runoff and seasonal water cycle. Specifically, we will focus on discussing 7
Page 1 and 2: SCHRIFTENREIHE Institut für Pflanz
Page 3 and 4: Aus dem Institut für Pflanzenernä
Page 5: I Table of contents I Table of cont
Page 8 and 9: controlling soil moisture are of pa
Page 11 and 12: Zusammenfassung Überweidung wird a
Page 13 and 14: Die Beweidung beieinflusst besonder
Page 15 and 16: II List of figures Fig. 2.1. Locati
Page 17 and 18: measured soil moisture in time stab
Page 19 and 20: III List of tables Table 2.1. Descr
Page 21 and 22: 1.1 Background Chapter 1 Introducti
Page 23 and 24: Chapter 1 Introduction is also unce
Page 25: Chapter 1 Introduction water in spr
Page 29 and 30: Chapter 1 Introduction Krümmelbein
Page 31 and 32: Chapter 2 Spatial variability of so
Page 59 and 60: Chapter 3 Spatio-temporal variabili
Page 73 and 74: Chapter 3 Factors controlling spati
Page 75 and 76: Chapter 3 Factors controlling spati
Page 77 and 78:
Chapter 3 Factors controlling spati
Page 79 and 80:
Page 81 and 82:
Page 83 and 84:
Page 85 and 86:
Chapter 4 Temporal stability of soi
Page 87 and 88:
Page 89 and 90:
Y orientation Chapter 4 Temporal st
Page 91 and 92:
Page 93 and 94:
MRD(%) MRD(%) 100 80 60 40 20 0 -20
Page 95 and 96:
Page 97 and 98:
Page 99 and 100:
Page 101 and 102:
Soil water content (%) 40 30 20 10
Page 103 and 104:
Page 105 and 106:
Chapter 5 Modeling Grazing Effects
Page 107 and 108:
Page 109 and 110:
Page 111 and 112:
Page 113 and 114:
Page 115 and 116:
Page 117 and 118:
Page 119 and 120:
Page 121 and 122:
Page 123 and 124:
Page 125 and 126:
Page 127 and 128:
Page 129 and 130:
Page 131 and 132:
Page 133 and 134:
Page 135 and 136:
Chapter 6 Modeling of Coupled Water
Page 137 and 138:
Page 139 and 140:
Page 141 and 142:
Page 143 and 144:
Page 145 and 146:
Page 147 and 148:
Page 149 and 150:
Page 151 and 152:
Page 153 and 154:
Page 155 and 156:
Page 157 and 158:
Page 159 and 160:
Chapter 7 General discussion and co
Page 161 and 162:
Page 163 and 164:
Page 165 and 166:
Page 167 and 168:
References Chapter 7 General discus
Page 169 and 170:
Page 171 and 172:
8. ACKNOWLEDGMENTS Firstly I would
Page 173 and 174:
Curriculum Vitae M.Sc. Ying Zhao Of
Page 175:
Schriftenreihe des Instituts Neuere
show all

SCHRIFTENREIHE Institut für Pflanzenernährung und Bodenkunde ...

Create successful ePaper yourself

Delete template?

Save as template?