论文部分内容阅读
在贵州中部黄壤旱坡地上 ,采用无界径流小区法及盆栽试验方法 ,对不同土壤磷素水平下黄壤旱坡地磷素的流失进行研究。分析结果表明 :不同土地利用方式下黄壤旱坡地地表径流中颗粒态磷和水溶态磷的浓度出现明显的差异 ,其大小顺序为高肥力旱地 >低肥力旱地 >幼林地 >马尾松成林地。随着黄壤旱地磷肥施用量的增加 ,径流排水中水溶态磷的浓度出现明显的提高 ,当旱地施磷量增加 6倍时 ,径流排水中水溶态磷的平均浓度相应增加 6 .6倍。相关分析表明 ,土壤有效磷 (Olsen P)含量与径流磷浓度之间的相关性达到极显著性水平 (r=0 .935 0 ) ,土壤磷素水平提高的同时 ,也相应增加了土壤磷素流失的潜能。因此 ,调整土地利用方式以及减少旱地磷肥的施用量 ,可减少黄壤旱坡地磷素的大量流失 ,有利于水环境质量的保护
In the yellow soil arid slope in the middle of Guizhou, using unbounded runoff plot method and pot experiment method, the phosphorus loss under different soil phosphorus levels was studied. The results showed that the concentrations of particulate phosphorus and water soluble phosphorus in surface runoff of yellow soil were significantly different under different land use patterns. The order of their concentrations was high-yield dry land> low-yield dry land> young plantation> Pinus massoniana plantation. With the increase of the amount of P fertilizer applied in the yellow soil, the concentration of water-soluble phosphorus in runoff drainage significantly increased. When the amount of phosphorus in dry land increased 6 times, the average concentration of water-soluble phosphorus in runoff drainage increased by 6.6 times. Correlation analysis showed that the correlation between soil available phosphorus (P) and runoff P concentration reached a significant level (r = 0.935 0). Soil phosphorus content increased at the same time, and the soil P Potential for loss. Therefore, adjusting the land use patterns and reducing the application amount of phosphate fertilizer in dry land can reduce the massive loss of phosphorus in the arid slope of yellow soil, which is good for the protection of water environment quality