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| Vegetation diversity and soil biological characteristics under different restoration patterns in abandoned salinity farmland in arid areas |
| Li Bing1, Liang Jing1, Zhang Fenghua1, Liu Guangming2 |
| 1.Key Laboratory of Oasis Eco-agriculture, Xinjiang Production and Construction Croup, Shihezi University, Shihezi, Xinjiang 832003, China; 2.Institute of Soil Science, Chinese Academy of Science, Nanjing, Jiangsu 210008, China |
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Abstract The effects of restoration pattern on vegetation diversity and soil biological characteristics in salinity abandoned farmland are studied in the experimental field on the alluvial fan oasis of Manas Ri-ver Basin. The restoration pattern includes water supplement, grass artificial cultivation and replanting. The results indicate that the recovery measures applied do significantly increase the vegetation diversity, soil microorganism quantity and soil enzyme activity in the field. Compared with the original abandoned farmland, the vegetation diversity is increased by 25.13% and 9.84%, the electrical conductivity is decreased by 49.15% and 33.55%, the organic mass is raised by 99.10% and 88.34%, and the alkali-hydrolysed nitrogen is 70.10% and 36.57% higher in the field treated by water supplement, grass artificial cultivation, respectively. At the same time, urease, catalase, invertase and phosphatase activity are increased by 65.18%, 47.21%, 93.23% and 116.03%, respectively, under the treatment of grass artificial cultivation. The soil microorganism quantity is minimal in the abandoned farmland, but is the highest in the field recovered with grass artificial cultivation, and is in between in the field treated by replanting method. It is shown that there exists a positive correlation between soil microbial biomass carbon and number of soil microorganisms, and there is a significantly positive correlation to phyto community α-diversity. Obviously, grass artificial cultivation or water supplement can enhance vegetation diversity and improve soil enzyme activity in abandoned farmland in arid areas, subsequently, substantially reduce salt content in the soil and promote soil nutrient accumulation.
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Received: 27 February 2014
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