Details
Originalsprache | Englisch |
---|---|
Titel des Sammelwerks | Grazing Ecology |
Untertitel | Vegetation and Soil Impact |
Seiten | 97-130 |
Seitenumfang | 34 |
Publikationsstatus | Veröffentlicht - Aug. 2012 |
Extern publiziert | Ja |
Abstract
Overgrazing has been regarded as a main cause for land degradation in Inner Mongolia grassland because of the increase in population and shift in the socio-economic system in recent years. However, given the vital importance for the production of livestock and the environmental changes, fundamental understanding on topsoil sensitivity to grazing is lacking. Based on MAGIM (Matter fluxes in grasslands of Inner Mongolia as influenced by stocking rate) project, intensive observations, analyses, and modeling of environmental changes responding to grazing in Inner Mongolia grassland were conducted. In this chapter, we concentrated on the spatio-temporal variation of soil properties (e.g., soil moisture) in general and modeling the effects of grazing manage-ment (i.e., five grazing plots including, ungrazed since 1979=UG79, ungrazed since 1999=UG99, moderately grazed=MG, continuously grazed=CG, and heavily grazed= HG) on water flux in particular. Results showed that grazing treatment reduced the topsoil moisture contents (0-6 cm) and homogenized soil moisture spatial patterns which were controlled by soil and plant properties, especially soil physical properties. Multivariate geostatistics further revealed scale-dependent correlation for these controlling parameters depending on treatment. The soil and plant properties strongly controlled the variation of soil moisture for UG99 at short-scale (45 m), and for CG and HG at long-scale (90 m), however, weakly controlled the variation of soil moisture for UG79 and MG. Therefore, we suggest that pasture management strongly modified soil moisture patterns, which should be considered in the hydrological models at multiple spatial scales. Based on soil pit scaled monitoring data, we further found seasonal change of the soil moisture was most significant in the topsoil (0-10 cm) and was less pronounced in the deeper soil. Soil water storage decreased with increasing grazing intensity, which is linked to the grazing-induced soil structure change. Moreover, we use HYDRUS-1D model to parameterize this grazing-induced shifts of soil pore function. The model was well verified with the measured soil moisture values. The modeling results showed no significant difference on water budget components between the two ungrazed sites and moderate grazing, while heavy grazing significantly decreased interception from 17 to 7 mm and transpiration from 121 to 74 mm, and increased evaporation from 88 to 128 mm. We conclude that intensive grazing in our studied area deteriorated soil functions and reduced plant available water, and consequently reduced grassland productivity and enhanced the risks for wind and water erosion.
ASJC Scopus Sachgebiete
- Agrar- und Biowissenschaften (insg.)
- Allgemeine Agrar- und Biowissenschaften
Ziele für nachhaltige Entwicklung
Zitieren
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- Harvard
- Apa
- Vancouver
- BibTex
- RIS
Grazing Ecology: Vegetation and Soil Impact. 2012. S. 97-130.
Publikation: Beitrag in Buch/Bericht/Sammelwerk/Konferenzband › Beitrag in Buch/Sammelwerk › Forschung › Peer-Review
}
TY - CHAP
T1 - Soil moisture patterns and fluxes responding to grazing intensity in semiarid inner mongolia grassland
AU - Zhao, Ying
AU - Peth, Stephan
AU - Horn, Rainer
PY - 2012/8
Y1 - 2012/8
N2 - Overgrazing has been regarded as a main cause for land degradation in Inner Mongolia grassland because of the increase in population and shift in the socio-economic system in recent years. However, given the vital importance for the production of livestock and the environmental changes, fundamental understanding on topsoil sensitivity to grazing is lacking. Based on MAGIM (Matter fluxes in grasslands of Inner Mongolia as influenced by stocking rate) project, intensive observations, analyses, and modeling of environmental changes responding to grazing in Inner Mongolia grassland were conducted. In this chapter, we concentrated on the spatio-temporal variation of soil properties (e.g., soil moisture) in general and modeling the effects of grazing manage-ment (i.e., five grazing plots including, ungrazed since 1979=UG79, ungrazed since 1999=UG99, moderately grazed=MG, continuously grazed=CG, and heavily grazed= HG) on water flux in particular. Results showed that grazing treatment reduced the topsoil moisture contents (0-6 cm) and homogenized soil moisture spatial patterns which were controlled by soil and plant properties, especially soil physical properties. Multivariate geostatistics further revealed scale-dependent correlation for these controlling parameters depending on treatment. The soil and plant properties strongly controlled the variation of soil moisture for UG99 at short-scale (45 m), and for CG and HG at long-scale (90 m), however, weakly controlled the variation of soil moisture for UG79 and MG. Therefore, we suggest that pasture management strongly modified soil moisture patterns, which should be considered in the hydrological models at multiple spatial scales. Based on soil pit scaled monitoring data, we further found seasonal change of the soil moisture was most significant in the topsoil (0-10 cm) and was less pronounced in the deeper soil. Soil water storage decreased with increasing grazing intensity, which is linked to the grazing-induced soil structure change. Moreover, we use HYDRUS-1D model to parameterize this grazing-induced shifts of soil pore function. The model was well verified with the measured soil moisture values. The modeling results showed no significant difference on water budget components between the two ungrazed sites and moderate grazing, while heavy grazing significantly decreased interception from 17 to 7 mm and transpiration from 121 to 74 mm, and increased evaporation from 88 to 128 mm. We conclude that intensive grazing in our studied area deteriorated soil functions and reduced plant available water, and consequently reduced grassland productivity and enhanced the risks for wind and water erosion.
AB - Overgrazing has been regarded as a main cause for land degradation in Inner Mongolia grassland because of the increase in population and shift in the socio-economic system in recent years. However, given the vital importance for the production of livestock and the environmental changes, fundamental understanding on topsoil sensitivity to grazing is lacking. Based on MAGIM (Matter fluxes in grasslands of Inner Mongolia as influenced by stocking rate) project, intensive observations, analyses, and modeling of environmental changes responding to grazing in Inner Mongolia grassland were conducted. In this chapter, we concentrated on the spatio-temporal variation of soil properties (e.g., soil moisture) in general and modeling the effects of grazing manage-ment (i.e., five grazing plots including, ungrazed since 1979=UG79, ungrazed since 1999=UG99, moderately grazed=MG, continuously grazed=CG, and heavily grazed= HG) on water flux in particular. Results showed that grazing treatment reduced the topsoil moisture contents (0-6 cm) and homogenized soil moisture spatial patterns which were controlled by soil and plant properties, especially soil physical properties. Multivariate geostatistics further revealed scale-dependent correlation for these controlling parameters depending on treatment. The soil and plant properties strongly controlled the variation of soil moisture for UG99 at short-scale (45 m), and for CG and HG at long-scale (90 m), however, weakly controlled the variation of soil moisture for UG79 and MG. Therefore, we suggest that pasture management strongly modified soil moisture patterns, which should be considered in the hydrological models at multiple spatial scales. Based on soil pit scaled monitoring data, we further found seasonal change of the soil moisture was most significant in the topsoil (0-10 cm) and was less pronounced in the deeper soil. Soil water storage decreased with increasing grazing intensity, which is linked to the grazing-induced soil structure change. Moreover, we use HYDRUS-1D model to parameterize this grazing-induced shifts of soil pore function. The model was well verified with the measured soil moisture values. The modeling results showed no significant difference on water budget components between the two ungrazed sites and moderate grazing, while heavy grazing significantly decreased interception from 17 to 7 mm and transpiration from 121 to 74 mm, and increased evaporation from 88 to 128 mm. We conclude that intensive grazing in our studied area deteriorated soil functions and reduced plant available water, and consequently reduced grassland productivity and enhanced the risks for wind and water erosion.
KW - Grazing impact
KW - HYDRUS-1D
KW - MAGIM
KW - Semivariogram
KW - Soil conservation
UR - http://www.scopus.com/inward/record.url?scp=84892004157&partnerID=8YFLogxK
M3 - Contribution to book/anthology
AN - SCOPUS:84892004157
SN - 9781621004363
SP - 97
EP - 130
BT - Grazing Ecology
ER -