+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Experimental studies on the effects of the Conversion of Cropland to Grassland Program on the water budget and evapotranspiration in a semi-arid steppe in Inner Mongolia, China

, : Experimental studies on the effects of the Conversion of Cropland to Grassland Program on the water budget and evapotranspiration in a semi-arid steppe in Inner Mongolia, China. Journal of Hydrology 411.1-2

Since the late 1990s China has promoted the "Conversion of Cropland to Forest and Grassland Program" (CCFGP) as the largest environmental restoration program in the world. Because more water was required for established vegetation, it was assumed that evapotranspiration (ET) and water use in an older restored grassland would be greater than that in a younger restored grassland and that water shortages would then become more severe for further vegetation establishment in a semiarid steppe due to the extraction of the established vegetation. To verify this hypothesis, a field experiment was carried out in 2008-2009 at seven sites of different ages after restoration. The hypothesis was tested using the Bowen ratio system together with other comparative methods. Results showed that less rainfall would infiltrate the deeper soil layer as the period of time after restoration increased and that the natural steppe site had the shallowest infiltration depth (10 cm or less). However, the youngest restored grassland site had the deepest infiltration depth and the highest soil water content. These results also showed that transpiration and ET rates were higher in the natural steppe site and older restored sites than those in the younger restored sites. Furthermore, it was found that the ratio between soil evaporation and ET was generally lower for all seven sites, which indicated that transpiration was a dominant component in ET. These results indicated that more water was used for vegetation establishment in the older restored grassland than that in the younger restored grassland. Our hypothesis was proved to be true. Meanwhile, it was also found that the dominant species changed from annual herbs (species had lower drought tolerance ability) in the younger restored grassland to perennial grasses in the older restored grassland (species had higher drought tolerance ability). Therefore, it was concluded that the natural steppe was able to utilize more water for vegetation establishment and it used water more efficiently than the restored steppe, while the older restored steppe used water more efficiently than the younger restored steppe. Because changes of vegetation type from annual to perennial not only increased evapotranspiration but also changed the water budget, more attention should be paid to water shortage when undertaking the CCFGP in semiarid steppes.


DOI: 10.1016/j.jhydrol.2011.09.040

Other references

Cheissin, Eug, 1935: Vom Einfluss anaerober Bedingungen auf verschiedene Sporulationsstadien der Oocysten von Eimeria magna und Eimeria stiedae. Sporulation of the oocysts of Eimeria magna and E. stiedae will not start under anaerobic conditions nor will the final processes be completed if anaerobic conditions are brought about in the middle of the process. The sensitive periods are those...

Anonymous, 1999: Advertisement. Analytical Chemistry 71(11): 361a-361a

Bron, P.A.; Benchimol, M.G.; Lambert, J.; Palumbo, E.; Deghorain, M.; Delcour, J.; D.V.s, W.M.; Kleerebezem, M.; Hols, P., 2002: Use of the alr gene as a food-grade selection marker in lactic acid bacteria. Both Lactococcus lactis and Lactobacillus plantarum contain a single alr gene, encoding an alanine racemase (EC, which catalyzes the interconversion of D-alanine and L-alanine. The alr genes of these lactic acid bacteria were investigated...

Carter, Richard, 1997: John McCrae (1872-1918): Doctor-soldier-poet. Out of the ruins of World War I arose the poignant verse of the "Trench Poets." Lieutenant Colonel John McCrae, Canadian doctor, professor, and soldier, exemplified this verse in his haunting poem "In Flanders Fields." After es...

Davis, F.; Stine, P.; Stoms, D.; Borchert, M.; Hollander, A., 1995: Gap analysis of the actual vegetation of California. 1. The southwestern region. Madrono 42(1): 40-78

Chae, K.; Gonong, B.J.; Kim, S-Chul.; Kieslich, C.A.; Morikis, D.; Balasubramanian, S.; Lord, E.M., 2011: A multifaceted study of stigma/style cysteine-rich adhesin (SCA)-like Arabidopsis lipid transfer proteins (LTPs) suggests diversified roles for these LTPs in plant growth and reproduction. Lily stigma/style cysteine-rich adhesin (SCA), a plant lipid transfer protein (LTP) which is secreted into the extracellular matrix, functions in pollen tube guidance in fertilization. A gain-of-function mutant (ltp5-1) for Arabidopsis LTP5, an SC...

Persidsky, B.M., 1929: The development of the auxospores in the group of the Centricae. The author considers the auxospore more closely allied to a sexual spore than to an asexual since it is diploid.

Walker, L.R.; Barnes, P.L.; Powell, E.A., 2006: Tamarix aphylla: a newly invasive tree in Southern Nevada. In the southwestern United States, the nonnative athel pine (Tamarix aphylla) was presumed to be sterile and therefore not as likely to spread as its widely distributed, nonnative congener, T. ramosissima. However, at Lake Mead National Recreation...

Willett, C.S., 2006: Deleterious epistatic interactions between electron transport system protein-coding loci in the copepod Tigriopus californicus. The nature of epistatic interactions between genes encoding interacting proteins in hybrid organisms can have important implications for the evolution of postzygotic reproductive isolation and speciation. At this point very little is known about t...

Braun, W., 1955: Experiences with the antimycotic ovitrol. Ovitrol (active principle, 5, 5'-dichlor-2, 2'-dioxydiphenylsulphide) possessed satisfactory in vitro activity against Microsporon lanosum, Epidermophyton Kaufmann-Wolf, E. rubrum, and T. gypseum . Good results were achieved in the treat...