Journal of Food, Agriculture and Environment

Spatial and temporal variations of soil total phosphorus under different land use type in Wan’an watershed, China

Author(s):

Zhichao Chen ¹, Xiaolin Yang ²*, Changhua Liu ¹, Dianpeng Zhang ³

Recieved Date: 2013-07-12, Accepted Date: 2013-10-02

Abstract:

The spatial and temporal variations of soil phosphorus under different land uses in a watershed (12.10 km²) in the hilly area of central Sichuan Basin, China were investigated using conventional statistics, geostatistics and geographical information systems (GIS) to produce nutrient maps and to provide information for land management and control of environmental issues. Surface soil samples (0-15 cm) from 276 sites within the watershed were collected at April and August and analyzed for soil total phosphorus (STP). The spatial heterogeneities of STP under different land use and the temporal variation of soil nutrients in dry season and rainy season were characterized and analyzed. The result showed that (1) the concentrations of STP were deeply influenced by land use, the mean of STP values ranged from 0.42 to 0.73 g/kg, and mean STP content under different land use followed the order paddy field > upland field > forest land; (2) No significant difference was observed on STP contents between April and August under same land use; (3) The geostatistics information of STP in the agricultural land generally showed moderate spatial dependence and the strong spatial dependence in forest land can be explained by intrinsic factors due to rare human disturbance. We conclude that the obvious spatial and temporal patterns of phosphorus under different land use must be considered in identifying sites which are at risk of P loading, and evaluate their potential to generate diffuse pollution. Taking land use into account is essential for land management and environmental restoration.

Keywords:

Land use type, spatial heterogeneities, temporal variation, watershed scale

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Journal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 3&4
Category: Environment
Pages: 1779-1783

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