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| 江汉平原地区潮土水稻田面水磷素流失风险研究 | |
| 引用本文： | 周萍,范先鹏,何丙辉,刘宏斌.江汉平原地区潮土水稻田面水磷素流失风险研究[J].水土保持学报,2007,21(4):47-50. |
| 作者姓名： | 周萍 范先鹏 何丙辉 刘宏斌 |
| 作者单位： | 1. 西南大学,资源环境学院,重庆,400715;中国农业科学院农业资源与农业区划研究所,北京,100081;湖北省农科院植保土肥所,湖北,武汉,430064 2. 湖北省农科院植保土肥所,湖北,武汉,430064 3. 西南大学,资源环境学院,重庆,400715 4. 中国农业科学院农业资源与农业区划研究所,北京,100081 |
| 基金项目： | 国家科技支撑计划;国家重点基础研究发展计划(973计划);国际植物营养研究所(IPNI)项目 |
| 摘 要： | 通过监测田面水磷素含量和形态的动态变化来研究稻田磷素流失风险.结果表明:从环境角度、经济效益和水稻生长出发,用线性 平台施肥模型得到该地区水稻的最佳施磷量为66 kg P2O5/hm2;施磷后田面水各形态磷浓度呈现急剧下降-缓慢下降-平稳的过程,但在施磷后7天内田面水磷素浓度仍然较高,是磷素流失的高危险期;用对数模型模拟田面水中各形态磷素含量与施肥时间的关系(可溶性有机磷SOP除外),其相关系数r为0.715 1～0.963 9,在P＜0.05水平下达到极显著水平,应用模型预测常规施肥下田面水的安全排放期时为施肥后24天;除P0处理外,其余各处理中田面水磷的形态以可溶性无机磷SIP为主,随着施磷量的增加,颗粒态磷PP在田面水中的浓度呈现增大的趋势,因此,在评价田面水排放或者稻田径流对水体富营养化的贡献时,颗粒态磷PP的影响也不容忽视. |
| 关 键 词： | 磷素 水稻田 田面水 流失风险 施肥模型 |
| 文章编号： | 1009-2242(2007)04-0047-04 |
| 修稿时间： | 2007年2月9日 |
Research on Loss Risk of Phosphorus in Surface Water of Paddy Soil in Jianghan Plain Region |
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| ZHOU Ping,FAN Xian-peng,HE Bing-hui,LIU Hong-bin.Research on Loss Risk of Phosphorus in Surface Water of Paddy Soil in Jianghan Plain Region[J].Journal of Soil and Water Conservation,2007,21(4):47-50. | |
| Authors: | ZHOU Ping FAN Xian-peng HE Bing-hui LIU Hong-bin |
| Abstract: | A field plot experiment with 4 phosphorus application rates in 4 replications was conducted on the calcareous paddy soil in the Jianghan Plain under rice plant in the year 2005,in order to estimate the loss risk of phosphorus.Results show that: the P concentration in surface water has great relation with the P application rate,so considering of the environment impact,economic benefit and the need amount P of rice growth,we recommend the P application rate is 66 kgP2O5/hm2 by linear plateau model;during the days after P application,the concentration of P in surface water takes on a course that fall rapidly at first,then fall slowly and to be steady,and the P concentration of the surface water still keep high in 7 days after P application,so it is dangerous for P drainage;the logarithm model related to time can predict the concentration trend of the P(except SOP),r is 0.715 1 ~0.963 9(P<0.05),so we can utilize this model to predict the drainage safe time,and we find the safe time for water drainage is about 24 days after P application under the common P application rate;the soluble inorganic phosphorus(SIP) is main form of the total phosphorus(TP) in surface water,except the treatment P0,and the particulate phosphorus(PP) increases along with the increase of P rate,it indicates that the influence of PP can not be neglect when we estimate the P surface water contribute to the water eutrophication. |
| Keywords: | phosphorus paddy soil surface water loss risk fertilization model |
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