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SCHRIFTENREIHE Institut für Pflanzenernährung und Bodenkunde ...

SCHRIFTENREIHE Institut für Pflanzenernährung und Bodenkunde ...

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Chapter 2 Spatial variability of soil properties affected by grazing intensity in Inner Mongolia grassland<br />

content.<br />

Table 2.5. Isotropic variogram parameters for shear strength on three sampling soil<br />

water statuses in 2004.<br />

Treatment<br />

Sampling<br />

soil<br />

water<br />

statuses<br />

Nugget<br />

Co<br />

Sill<br />

Co+Cs<br />

Range<br />

A0 (m)<br />

Proportion<br />

Cs/(Co+Cs)<br />

R 2 RSS γ-Model<br />

UG 79 Dry 6.84 57.60 27 0.88 0.50 78.57 Exponential<br />

Wet 5.94 35.10 31 0.83 0.36 78.57 Exponential<br />

Medium 1.98 14.40 40 0.86 0.73 7.29 Exponential<br />

UG 99 Dry 5.58 47.70 38 0.88 0.48 315.90 Exponential<br />

Wet 3.51 27.90 14 0.88 0.27 39.69 Exponential<br />

Medium 3.78 29.70 19 0.90 0.19 21.87 Exponential<br />

WG Dry 8.73 63.00 87 0.86 0.26 178.20 Exponential<br />

Wet 3.60 30.60 63 0.88 0.23 10.53 Exponential<br />

Medium 5.58 36.90 90 0.85 0.32 52.65 Exponential<br />

CG Dry 36.00 72.90 400 0.50 0.93 81.00 Spherical<br />

Wet 26.10 52.20 270 0.50 0.80 97.20 Spherical<br />

Medium 3.60 27.00 75 0.87 0.19 67.23 Exponential<br />

HG Dry - - - - - - -<br />

Wet 6.03 36.90 38 0.84 0.64 46.98 Exponential<br />

Medium 1.53 31.50 26 0.95 0.68 25.11 Spherical<br />

Cs: structural variance; R 2 : determination coefficient; RSS: reduced sum of squares; -:<br />

No data available.<br />

3.2 Spatial distribution of soil properties in UG 79<br />

The spatial distribution of various soil parameters and their characteristics<br />

are exemplary shown for the ungrazed plot UG 79 (fenced for 25 years,<br />

considered to represent the typical ecosystem conditions without grazing). Table<br />

7 shows the descriptive statistics for all measured soil properties. The mean<br />

contents of sand, silt and clay were 48.5, 35.3 and 16.2%, respectively. A small<br />

standard deviation (SD) of the normally distributed data indicated that the<br />

sampling area could be considered as homogeneous in term of soil texture. Soil<br />

organic carbon (SOC) concentration was also normally distributed with a mean<br />

of 31.2 g kg -1 , but had a higher coefficient of variance (CV) compared to soil<br />

23

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