The changes of soil physical and chemical property during the enclosure process in a typical desert oasis ecotone of the Hexi Corridor in northwestern China

doi:10.7522/j.issn.1000-694X.2019.00113

Journal of Desert Research ›› 2020, Vol. 40 ›› Issue (2): 222-231.DOI: 10.7522/j.issn.1000-694X.2019.00113

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The changes of soil physical and chemical property during the enclosure process in a typical desert oasis ecotone of the Hexi Corridor in northwestern China

Wang Guohua^1,2, Ren Yijun¹, Gou Qianqian¹

1. College of Geographical Sciences, Shanxi Normal University, Linfen 041000, Shanxi, China;
2. Linze Inland River Basin Research Station of CERN/Key Lab. of Ecohydrology of Inland River Basin, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China

Received:2019-10-10 Revised:2019-12-12 Online:2020-03-20 Published:2020-04-26

Abstract

Abstract: In the desert oasis ecotone of the Hexi Corridor, enclosing natural vegetation is one of the most economical measures to restore vegetation communities and prevent desertification in oasis. In this paper, we used mobile sand dunes as a control (0 years) and investigated the changes in soil and vegetation after 5 and 15 years enclosing in desertifed land. The results showed that the biodiversity of natural sand-fixing vegetation community increased, and the density, coverage and biomass of shrub layer and annual herbaceous plant layer also increased significantly.The shrub layer coverage increased from 10% in shifting dunes to 40% in stabilized dunes after 15 years of enclosure. The herbaceous plant layer was dominated by annual herbaceous species, and the biomass increased from 1 g·m^-2 to 13 g·m^-2. With the increase of natural vegetation cover, the content of clay and silt significantly increased and the soil texture was changed from coarse sand to fine sand. The organic matter, total nitrogen and total phosphorus also increased, and the soil nutrients content under the shrub was much higher than in the alley. However, there was a significant accumulation of salt occurred in the soil surface, and the irons such as SO₄^2-, K⁺ and Na⁺ increased by 5, 2 and 16 times, respectively. In the arid desert oasis ecotone with precipitation of about 100 mm, the enclosure can restore the sand-fixing vegetation community and improve the sandy soil texture and nutrients. However, the soil salinity needs further investigation in future.

Key words: desert-oasis ecotone, natural vegetation, enclosure, soil salinity, soil nutrients

CLC Number:

Wang Guohua, Ren Yijun, Gou Qianqian. The changes of soil physical and chemical property during the enclosure process in a typical desert oasis ecotone of the Hexi Corridor in northwestern China[J]. Journal of Desert Research, 2020, 40(2): 222-231.

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The changes of soil physical and chemical property during the enclosure process in a typical desert oasis ecotone of the Hexi Corridor in northwestern China

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