Appendix I




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A)



B)

C)





Appendix I. Panoramic view of the experimental area (A), detailed view of the Stipa tenacissima tussocks, and the biological soil crusts and rock fragments covering the inter-tussock areas (B), and detail of the establishment of the experimental plots (C). One Tussock and one Open plot are shown in the foreground. Note the nylon mesh used to reduce raindrop energy and the container where runoff water was stored.


Appendix II. Soil temperature at 5 cm depth as affected by BSC fragmentation (F) and Herbicide application (H) Bars correspond to averages and standard errors of n = 8 sampling points per treatment. Results of Repeated-measures ANOVA are shown.

Appendix III. Results of the analyses of variance to evaluate the significance of the effect of Stipa tenacissima tussocks, biological soil crust fragmentation and herbicide application on soil moisture content at different distances upslope of S. tenacissima tussocks (Location). In all cases the degrees of freedom to calculate the F statistic were 1 and 32 for the factor and the error terms, respectively.



Location

Factor

F

p

Lower

Stipa

2.350

0.135




Fragmentation

1.744

0.192




Herbicide application

0.029

0.865




Stipa x Fragmentation

0.394

0.535




Stipa x Herbicide application

1.346

0.255




Fragmentation x Herbicide application

0.610

0.440




Stipa x Fragmentation x Herbicide application

0.026

0.874

Middle

Stipa

1.980

0.169




Fragmentation

2.975

0.094




Herbicide application

2.253

0.143




Stipa x Fragmentation

0.632

0.433




Stipa x Herbicide application

0.876

0.356




Fragmentation x Herbicide application

<0.001

0.995




Stipa x Fragmentation x Herbicide application

1.485

0.232

Upper

Stipa

4.677

0.038




Fragmentation

7.444

0.010




Herbicide application

2.570

0.119




Stipa x Fragmentation

0.066

0.798




Stipa x Herbicide application

0.001

0.980




Fragmentation x Herbicide application

0.016

0.901




Stipa x Fragmentation x Herbicide application

1.050

0.313


Appendix IV. Volume of the bulk precipitation events recorded between January 1st 2003 and May 13th 2004 in the study area.









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