| 罗敏,王旭东.不同肥力土的土壤颗粒分布及其磷素吸附—解析规律[J].干旱地区农业研究,2008,(6):106~109 |
| 不同肥力土的土壤颗粒分布及其磷素吸附—解析规律 |
| Distribution of particles size and their phosphorus adsorption and desorption characteristics of Lou soils with different fertility |
| |
| DOI：10.7606/j.issn.1000-7601.2008.06.20 |
| 中文关键词: 土 颗粒分布 磷素 吸附-解析 |
| 英文关键词:Lou soil distribution of soil particle phosphorus adsorption and desorption |
| 基金项目:西北农林科技大学留学归国人员资助项目 |
|
| 摘要点击次数: 496 |
| 全文下载次数: 460 |
| 中文摘要: |
| 采用干筛法和培养实验,研究了不同肥力土的颗粒分布以及不同颗粒对磷素的吸附、解析规律。结果表明,在所筛分的5个粒径中,土以>5 mm、2～5 mm和0.25～1 mm 3个颗粒为主,随着土壤肥力提高,0.25～1 mm和1～2 mm两个粒径的土壤颗粒有明显增加。土壤颗粒由小到大变化,颗粒中磷素含量呈现由高到低的变化趋势。高肥力土壤和低肥力土壤相比,0.25～1 mm和1～2 mm两个粒径中的磷素含量分别增加40%和43%,差异达显著水平。土壤颗粒愈小对磷的吸附量越高。与土壤原样相比,<0.25 mm和0.25～1 mm两个粒径的颗粒对磷的吸附量高于土壤原样的,而1～2 mm、2～5 mm和>5 mm土壤颗粒对磷的吸附则小于土壤原样的。随着土壤颗粒径变大,磷的解析率增加。总体看来,高肥力土使中等大小土壤颗粒增多,对磷的吸附量有所减少,但对磷的解析量增大,这有助于提高磷肥的有效性,但也增加了磷素径流损失的风险。 |
| 英文摘要: |
| 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. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| | |