| 生物土壤与生态 |
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| Natural Vegetation Succession and Soil Water Change in Fallow Salinization Cropland in Minqin Oasis, Gansu Province |
| HE Fang-lan, LI Zhi-yuan, ZHAO Ming, YU Qiu-shi, GUO Shu-jiang, WANG Duo-ze |
| Gansu Minqin National Study Station for Desert Steppe Ecosystem, Gansu Desert Control Research Institute, Wuwei 733000, Gansu, China |
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Abstract Survey on natural vegetation and soil water of fallow salinization croplands in Minqin oasis, Gansu Province has been conducted by sampling in 105 quadrates of 21 sample plots. The natural vegetation succession and soil water change were studied by the method of space series replacing time series. In the 50 years of natural vegetation succession since cropland being fallow there appeared 22 plant species, belonging to 21 genera of 11 families. The community generally experienced a succession of Convolvulus arvensis community to Lepidium apetalum community to Peganum nigellastrum community to Lycium ruthenicum community and to Kalidium foliatum community. The succession process can be divided into four stages: the speedy restoration stage (1~2 years), primary alternating stage (3~8 years), high-level alternating stage (9~28 years) and slow restoration stage (after 29 years). Along with the vegetation succession, the Margalef index, Simpson index, and Shannon-wiener index decreased and the Monk index, Pielou index, and Alatalo index increased except for some secondary fluctuating. Simultaneously, soil water content experienced sharp decrease at first and a slow increase afterwards. The soil water content is lower than 10% in croplands being fallow in 1970s, 1978 and 1999; is within 10%~20% in croplands being fallow in 1950s, 1960s and 2004; and is higher than 20% in croplands being fallow in 2007.
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Received: 07 November 2009
Published: 20 November 2010
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2010, Vol. 30 
