|
|
|
| Spatial-temporal variation of mass fraction of soil total phosphorus in Henan Province |
| Li Ling, Zhang Shaokai, Yang Suqin |
| College of Resources and Environment, Henan Agricultural University,450002, Zhengzhou,China |
|
|
|
|
Abstract We analyzed the spatial and temporal variation of the mass fraction of soil total phosphorus in Henan Province in 1982 and 2009, using GIS, geostatistics and traditional statistics. The results show that: firstly, the best-fitting models of soil total phosphorus semivariogram of the two periods were all spherical models; in the meantime, there existed a medium spatial correlation. Secondly, the mass fraction of soil total phosphorus increased from 0.56 to 0.66 g/ kg from 1982 to 2009, with a growth rate of 17.86% and an average annual growth rate of 0.66%. Among different regions, the mass fraction of soil total phosphorus in eastern regions increased from 0.65 to 0.83 g/ kg with a growth rate of 27.69%, taking the first place in the whole province, while the growth rate of the mass fraction of total phosphorus in southern regions was the lowest, 6.12%. Besides, among the main soil types, the growth rates of the mass fraction of soil total phosphorus of lime concretion black soil, paddy soil and moisture soil, which are mainly distributed in the plain areas, were the highest, 29.55%, 29.27% and 18.46% respectively, as a result of the increase of fertilization, the improved fertilizing level and return of straw into farmland. In addition, the total phosphorus mass fraction of yellow brown soil decreased by 6.45%. The mass fraction of soil total phosphorus in plain areas was increasing, which might be attributed to the practices of mulching and organic manure application. We hold that such practices should be promoted actively.
|
|
Received: 18 April 2014
|
|
|
|
|
|
|
|
|
