| Distribution of particles size and their phosphorus adsorption and desorption characteristics of Lou soils with different fertility |
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| DOI：10.7606/j.issn.1000-7601.2008.06.20 |
| Key Words: Lou soil distribution of soil particle phosphorus adsorption and desorption |
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| Abstract: |
| The particles of Lou soil with different fertility were fractionated by dry sieving and incubating experiment and phosphorus adsorption and desorption of the particles and bulk soil were studied．Of all particles in Lou soil the particles with diameter of 0．25～1mm, 2～5mm or more than5mm were the main fractions. As the fertility improved the number of particles with diameter of 0．25～1mm, 1～2mm increased．With the increase of soil particle size the phosphorus concentration in the particles decreased．In the soil with high fertility phosphorus concentration increased in particles of 0．25～1mm and 1～2mm by 40％ and43％ compared to the same size particles from soil with low fertility．Phosphorus adsorption increased with the decrease of particle size．Soil particles with diameter of ＜0．25mm and 0．25～1mm had higher phosphorus adsorption capacity than soil bulk sample other fractional particles of 1～2mm, 2～5mm and ＞5mm in diameter had lower phosphorus adsorption capacity than soil bulk sample．With the increase of soil particle size the phosphorus desorption ratio increased．In summary Lou soil with high fertility could cause the mid-size particles to increase and decrease phosphorus adsorption increase phosphorus desorption which is of benefit for maintaining high level available P when certain P was applied while it may have high risk of phosphorus runoff in field. |