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| Enrichment and Ecological Risk Assessment of Available Phosphorus in Farmland Soils by GIS Technology——A Case Study of Taining County in Fujian |
| Received:October 31, 2014 |
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| KeyWord:mountain-hilly region;farmland;available phosphorus;enrichment;ecological risk |
| Author Name | Affiliation | E-mail | | ZHANG Yu | College of Resource and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | ZHANG Li-ming | College of Resource and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
University Key Lab of Soil Ecosystem Health and Regulation in Fujian, Fuzhou 350002, China | | | ZHOU Bi-qing | College of Resource and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
University Key Lab of Soil Ecosystem Health and Regulation in Fujian, Fuzhou 350002, China | | | SHEN Jin-quan | Fujian Cropland Construction and Soil Fertilizer Station, Fuzhou 350003, China | | | XU Fu-xiang | College of Resource and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | XING Shi-he | College of Resource and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
University Key Lab of Soil Ecosystem Health and Regulation in Fujian, Fuzhou 350002, China | fafuxsh@126.com |
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| Abstract: |
| Assessing enrichment characteristics and ecological risk of available phosphorus in farmland soils is of great significance for rational fertilization and environmental protection. Here a case study was conducted in Taining County, a mountain-hilly region in Northwest Fujian Province, to investigate the enrichment level, ecological risk and spatial distribution of available phosphorus in different types of soil under different land utilizations by using 1∶50 000 land use-soil type database based on the field investigation data at 6069 sampling sites in 1982 and 2221 sampling sites in 2008, and by combining geographical information system with mathematic models. Available phosphorus of farmland soils was enriched significantly in Taining from 1982 to 2008, with the average value being increased by 24.32 mg·kg-1 and the mean annual growth rate of 0.87 mg·kg-1. In general, the enrichment of available phosphorus in paddy soils was highest, with an average enrichment rate of 1.93, while that in purplish soils was lowest, with an average enrichment rate of 1.14. However, the greatest enrichment rate of available phosphorus was found in rainfed paddy field, with the enrichment rate of 2.08, whereas the lowest enrichment rate in vegetable land, with the enrichment rate of 0.69. The 31.89% of the county's total farmland soils had the ecological risk of phosphorus. These results indicate the necessity to draw up proper fertilization regime according to the enrichment level and ecological risk of soil available phosphorus in different soil types and different land utilizations. |
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