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| Prediction of Soil Phosphorus Leaching Risk Under Two Types of Land Use in Northern Area of Qinling Mountains |
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| KeyWord:soil P; P leaching; leaching change-point; land use |
| Author Name | Affiliation | | ZHANG Rui-long | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
2. Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | | Lu Jia-long | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
2. Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | | DIAO Zhan | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
2. Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China |
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| Abstract: |
| Soil phosphorus（P） leaching has been considered to be a critical cause of water eutrophication. Phosphorus leaching risks in Lou soil under two kinds of land use, kiwi-fruit orchard and arable land, in the northern area of Qiling Mountains were studied. The samples included surface layer（0~20 cm） samples of 43 kiwi orchard and 28 arable land and three profile（0~100 cm） samples of two types of land use. In general, soil phosphorus contents were higher in kiwi orchard than in arable land, with 42.63% of the kiwi orchard containing sufficient Olsen-P but 96.43% of the arable land being P deficient. In kiwi orchard soils, the change-point of phosphorus leaching was 40.11 mg·kg-1 for Olsen-P, and 62.79% of the orchard had potential phosphorus leaching. However, there was not obvious change-point for arable land, implying weak phosphorus leaching under decades of cultivation. The phosphorus leaching could be detected as deep as 40 cm under two kinds of land use. Some measures should be taken to improve crop yield and quality and to reduce environmental risks. |
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