Soil water carrying capacity of vegetation in the northeast of Ulan Buh Desert, China

doi:10.1007/s11461-009-0043-1

Front Fore Chin

2009, Vol. 4

Issue (3) : 309-316 https://doi.org/10.1007/s11461-009-0043-1

RESEARCH ARTICLE

Soil water carrying capacity of vegetation in the northeast of Ulan Buh Desert, China

Youliang TIAN, Yanhong HE(

), Liansheng GUO

Forestry College, Inner Mongolia Agricultural University, Hohhot 010019, China

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Abstract

The dynamic change of soil water as a function of leaf area index and the soil water deficit value, prerequisites for assuring the survival of plants, were simulated. We established a dynamic soil water model based on a theory of water balance, the characteristics of the environment, and the physiological ecology of the plants in the Ulan Buh Desert, northwestern China. We estimated the soil water carrying capacity of the vegetation in our study area of the desert. The results showed that the proportion of soil evaporation in the total amount of precipitation was greater than 60% in the wandering and semifixed sands and 44.8% in the fixed sand. When the leaf area index was less than 1.7 m²/m², the soil water deficit was maintained at a low level, but when the leaf area index continued to increase, the soil water deficit increased rapidly as well. In consequence, we come to the conclusion that the leaf area index of the soil water carrying capacity of the vegetation is 1.7 m²/m² in our study area.

Keywords Ulan Buh Desert soil water deficit soil water carrying capacity of vegetation leaf area index

Corresponding Author(s): HE Yanhong,Email:hyh20012008@sina.com

Issue Date: 05 September 2009

Cite this article:

Youliang TIAN,Yanhong HE,Liansheng GUO. Soil water carrying capacity of vegetation in the northeast of Ulan Buh Desert, China[J]. Front Fore Chin, 2009, 4(3): 309-316.

URL:

https://academic.hep.com.cn/ffc/EN/10.1007/s11461-009-0043-1
https://academic.hep.com.cn/ffc/EN/Y2009/V4/I3/309

Tab.1 Vegetation characteristics of plots

Tab.2 Regression analysis of simulated and actual water surface evaporation

Fig.1 Changes in soil evaporation from July 14 to August 10 in 2004. (a)–(f) are 1%, 3%, 4%, 5%, 6%, 9% initial soil water content, respectively.

Tab.3 Regression analysis of simulated and actual soil evaporation

Fig.2 Relationship between measured and simulated transpiration. (a):; (b):.

Fig.3 Soil water storage by simulation and measurement. (a): soil layer in 20-100 cm; (b): soil layer in 0-20 cm.

Tab.4 Soil water and evapotranspiration in Ulan Buh Desert

Fig.4 Relationship between soil water deficit and leaf area index (LAI)

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