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作 者 ：盛海君,夏小燕,杨丽琴,赵海涛,栾书荣,封克

期 刊 ：生态学报 2004年 24卷 12期 页码：2837~2840

关键词：磷；径流；水稻；

Keywords:phosphorus, runoff, rice,

摘 要 ：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。

Abstract:Continuous application of large amount of P fertilizer in Taihu Region in recent years has rapidly increased plant available phosphorus in the topsoil. Accumulation of P in an appropriate amount can lead to beneficial effects, while in an excessive amount could cause water pollution. Aimed at the realistic problem on environment protection, this study was carried out field plot experiments in a leaky paddy soil (in Zhangjiagang, Jiangsu province) with different levels of P application rates (0, 30, 70, 150,...

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