田埂宽度与种豆对稻田速效磷侧渗流失的影响
发布时间：2018-07-17 01:03
【摘要】：通过对不同宽度及其上种豆与否的稻田田埂内外侧0~60 cm剖面速效磷浓度及贮量的变化情况监测,分析了田埂宽度与种豆对稻田速效磷可能经田埂侧渗流失的影响。不种豆条件下,田埂宽度由40 cm增厚至50 cm和60 cm,速效磷向田埂外侧迁移,平均可减少2.19 kg hm~(-2)和2.36 kg hm~(-2);种植大豆条件下,田埂宽度增厚至50 cm和60 cm,速效磷可减少2.69 kg hm~(-2)和5.08 kg hm~(-2)。田埂上种植大豆可使内、外剖面间速效磷贮量差提高7.9%。尽管大豆吸收有助于降低田埂速效磷浓度,但由于大豆根系会在田埂中造成大孔隙,因此田埂种植大豆时应适当加宽田埂,以减小速效磷侧渗流失风险。田埂中40~60 cm土层水分充足,速效磷浓度、贮量均较高,可能是稻田速效磷侧渗流失的主要通道。
[Abstract]:By monitoring the change of available phosphorus concentration and storage in the 0 ~ (60 cm) section of field ridge in different widths and above or not, the effects of the width of field ridge and the seed bean on the loss of available phosphorus through the side of the ridge of paddy field were analyzed. The width of the ridge increased from 40 cm to 50 cm and 60 cm, and the available phosphorus migrated to the outer side of the ridge, which decreased 2.19 kg hm-2 and 2.36 kg hm-2 on average, while under soybean cultivation, the average amount of available phosphorus was 2.19 kg hm-2 and 2.36 kg hm-2, respectively. The width of the ridge increased to 50 cm and 60 cm, and the available phosphorus decreased 2.69 kg hm ~ (-2) and 5.08 kg hm ~ (-2). Planting soybean on the ridge can increase the difference of available phosphorus between internal and external sections by 7.9%. Although soybean absorption can help to reduce the concentration of available phosphorus in the ridge of the field, the root system of soybean will cause large pores in the ridge of the field, so the ridge should be widened properly in order to reduce the risk of loss of rapidly available phosphorus. The soil layer of 40 ~ 60 cm on the ridge of the field is full of water, the concentration of available phosphorus and the amount of available phosphorus are all high, which may be the main channel for the lateral leakage of available phosphorus in paddy field.
【作者单位】： 中国科学院沈阳应用生态研究所;辽宁盘锦鼎翔农工建集团有限公司;
【基金】：“十二五”国家科技支撑计划课题(2012BAD05B06) 国家自然科学基金(31000206)资助
【分类号】：S158
本文编号：2128338
[Abstract]:By monitoring the change of available phosphorus concentration and storage in the 0 ~ (60 cm) section of field ridge in different widths and above or not, the effects of the width of field ridge and the seed bean on the loss of available phosphorus through the side of the ridge of paddy field were analyzed. The width of the ridge increased from 40 cm to 50 cm and 60 cm, and the available phosphorus migrated to the outer side of the ridge, which decreased 2.19 kg hm-2 and 2.36 kg hm-2 on average, while under soybean cultivation, the average amount of available phosphorus was 2.19 kg hm-2 and 2.36 kg hm-2, respectively. The width of the ridge increased to 50 cm and 60 cm, and the available phosphorus decreased 2.69 kg hm ~ (-2) and 5.08 kg hm ~ (-2). Planting soybean on the ridge can increase the difference of available phosphorus between internal and external sections by 7.9%. Although soybean absorption can help to reduce the concentration of available phosphorus in the ridge of the field, the root system of soybean will cause large pores in the ridge of the field, so the ridge should be widened properly in order to reduce the risk of loss of rapidly available phosphorus. The soil layer of 40 ~ 60 cm on the ridge of the field is full of water, the concentration of available phosphorus and the amount of available phosphorus are all high, which may be the main channel for the lateral leakage of available phosphorus in paddy field.
【作者单位】： 中国科学院沈阳应用生态研究所;辽宁盘锦鼎翔农工建集团有限公司;
【基金】：“十二五”国家科技支撑计划课题(2012BAD05B06) 国家自然科学基金(31000206)资助
【分类号】：S158
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