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在水稻生长季节设置不同施磷水平 (0、30、70、15 0、30 0 kg P/hm2 )田间小区试验 ,研究施磷对环境及水稻产量的影响。结果表明 ,施磷量与土壤速效磷含量、土表径流磷含量均呈极显著正相关 ,随施磷量提高 ,表层土壤速效磷含量明显增加 ,径流磷含量也随之增加。早期径流液中的磷以颗粒磷为主 ,而后期可溶性磷的比例加大。一般施磷水平下径流液的可溶性磷中有机磷占的比例较大 ,而大施磷量时无机磷占的比例较大。虽然通过径流损失的磷占总施磷量的 0 .2 %以下 ,但径流液中可溶性磷的浓度和总磷浓度均已超过水体富营养化磷浓度的临界值 ,意味着长期的田间排水存在诱发附近水体富营养化的可能
Field experiments were conducted to determine the effects of phosphorus application on the environment and rice yield at different phosphorus levels (0, 30, 70, 150, 30 0 kg P / hm2) in the rice growing season. The results showed that there was a significant positive correlation between phosphorus application rate and soil available phosphorus and soil runoff phosphorus content. With the increase of phosphorus application, the content of available phosphorus in surface soil obviously increased and the phosphorus content in runoff also increased. The phosphorus in the early runoff was dominated by granular phosphorus, while the proportion of soluble phosphorus in the late stage increased. Generally speaking, the proportion of organic phosphorus in the soluble phosphorus in the runoff solution is larger than that in the phosphorus application, while the proportion of inorganic phosphorus in the phosphate fertilizer application is larger. Although the phosphorus lost through runoff accounts for less than 0.2% of the total phosphorus application, the concentrations of soluble phosphorus and total phosphorus in the runoff exceed the threshold of eutrophic phosphorus in water, which means long-term field drainage exists Induced eutrophication of nearby water may