[1]ZHOU Lili,MA Shiwei,MI Caihong,et al.Soil Moisture and Available Phosphorus Vertical Movement Law Under the Freezing and Thawing Condition[J].Research of Soil and Water Conservation,2017,24(03):70-74.
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Soil Moisture and Available Phosphorus Vertical Movement Law Under the Freezing and Thawing Condition
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
24
Number of periods:
2017 03
Page number:
70-74
Column:
Public date:
2017-06-28
- Title:
- Soil Moisture and Available Phosphorus Vertical Movement Law Under the Freezing and Thawing Condition
- Keywords:
- freeze-thaw action; phosphorus movement; moisture content; black earth
- CLC:
- S152.7;X144
- DOI:
- -
- Abstract:
- Soil is generally influenced by seasonal freeze-thaw cycle in northeast of China, which makes available phosphorus and moisture move and redistribute. The indoor simulated freezing and thawing environments were explored to investigate the available phosphorus and moisture vertical movement under freezing and thawing condition. The results showed that the soil available phosphorus, below the frozen layer, moved up with soil moisture under multiple freeze-thaw cycles; and after 30 times of successive freeze-thaw cycles maximum moisture content moved up and appeared below 3 cm of layer; the higher initial soil moisture, migrating to the upper layer of soil available phosphorus was higher after freeze-thaw cycles. But with increase of number of freeze-thaw cycles the soil available phosphorus content decreased. After one freeze-thaw cycles, the highest content of soil available phosphorus was 50.63 mg/kg. After 30 times of successive freeze-thaw cycles, the maximum content of soil available phosphorus was 43.81 mg/kg, reduced by 13.5%. The authors established the relational function between soil moisture content and available phosphorus with the initial moisture content, freeze-thaw cycles and soil depth, respectively, by the method of multiple regression analysis, and the coefficients of correlation respectively were 0.892 and 0.578. This research results will lay a foundation for preventing the non-point source pollution and soil salinization.
- References:
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1900-01-01