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| Soil productivity restoration and evaluation of erosion degradation in Weibei Dry Highland |
| 1.College of Resources and Environment, Northwest A&F University, 712100, Yangling, Shaanxi;2.Scientific Research Institute of Pearl River Water Resources Commission, 510611, Guangzhou: China |
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Abstract Soil erosion can decline productivity and threat to agricultural production. Therefore, it is a great significance to restore and evaluate the soil productivity. The recovery of soil productivity was studied and evaluated to simulate different degree of erosion of soil productivity, which selected the fertilization and cover the topsoil two recovery measures through artificial stripping of mellow soil. The results showed that: 1) soil erosion could deteriorate the physical and chemical properties of soil.Fertilization and covering soil could improve the soil bulk density, porosity, and increase soil organic matter and mass nutrient contents. 2) Soil erosion could reduce crop yields by an average of 1.27 percent per 1cm mellow soil eroded under no fertilization. Compared with the control treatment, corn yield increased by 0.87% per 1cm mellow soil eroded under fertilization. However, corn yield increased by 0.91% when covered by 1cm mellow soil, but could not completely compensate for the erosion yield losses. 3 ) The value of productivity index under different measures was calculated through soil productivity index model (PI model). The results showed that the value of productivity index under nofertilization was lowest. The average decrease of productivity index value was 2.17% per 1cm mellow soil eroded under fertilization. The average increase of productivity index value was 1.09% per 1cm cooked soil eroded compared with no fertilization, while the average increase of productivity index value was 1.29% per 1cm mellow soil covered, which indicated that the covering soil was easier than fertilization to improve soil productivity. 4) A good positive correlation was found between yield and productivity index by correlation analysis, which indicated that it was feasible to measure soil productivity by productivity index.
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Received: 18 September 2012
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