施磷对香溪河黄棕壤磷素淋失的影响研究

为了阐明香溪河流域黄棕壤在降雨条件下磷素通过淋溶流失的特征,采取室内连续淋洗的方法对香溪河黄棕壤的磷素淋溶特征进行了研究。结果表明,磷素的淋溶损失随着施磷水平的提高而增加,不同施磷量处理的淋洗峰值出现的时间无显著差异,淋失的磷主要以可溶性磷为主。施肥提高了各土层土壤的有效磷含量,施肥后土壤无机磷各形态磷之间并没有明显的相互转化规律,但是各组分所占无机磷比例的高低呈现O-PCa-PFe-PAl-P的规律。

Effects of Phosphorus Ertilizer Application on Phosphorus Leaching of Yellow-brown Soil in Xiangxi River

To clarify the risk of water eutrophication caused by phosphorus of yellow brown soil and phosphorus leaching character under the condition of rainfall in Xiangxi River ,the methods of continuous leaching are used to study P leaching character of yellow brown soil in Xiangxi River .Results show that the amount of P leaching is increased with the increase of P levels ,there is no obvious difference of P leaching peaks among the different P treatments and the lost phosphorus through leaching is mainly DTP .Phosphorus application has increased the content of Olsen -P in every layers of soil ,there is not obvious transformation rule between various forms of soil inorganic phosphorus after fertilization ,but the proportion of inor-ganic phosphorus in each branch office of present orders O -P>Ca-P>Fe-P>Al-P .