【摘要】：通過對不同寬度及其上種豆與否的稻田田埂內(nèi)外側(cè)0~60 cm剖面速效磷濃度及貯量的變化情況監(jiān)測,分析了田埂寬度與種豆對稻田速效磷可能經(jīng)田埂側(cè)滲流失的影響。不種豆條件下,田埂寬度由40 cm增厚至50 cm和60 cm,速效磷向田埂外側(cè)遷移,平均可減少2.19 kg hm~(-2)和2.36 kg hm~(-2);種植大豆條件下,田埂寬度增厚至50 cm和60 cm,速效磷可減少2.69 kg hm~(-2)和5.08 kg hm~(-2)。田埂上種植大豆可使內(nèi)、外剖面間速效磷貯量差提高7.9%。盡管大豆吸收有助于降低田埂速效磷濃度,但由于大豆根系會(huì)在田埂中造成大孔隙,因此田埂種植大豆時(shí)應(yīng)適當(dāng)加寬田埂,以減小速效磷側(cè)滲流失風(fēng)險(xiǎn)。田埂中40~60 cm土層水分充足,速效磷濃度、貯量均較高,可能是稻田速效磷側(cè)滲流失的主要通道。
[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.
【作者單位】： 中國科學(xué)院沈陽應(yīng)用生態(tài)研究所;遼寧盤錦鼎翔農(nóng)工建集團(tuán)有限公司;
【基金】：“十二五”國家科技支撐計(jì)劃課題(2012BAD05B06) 國家自然科學(xué)基金(31000206)資助
【分類號】：S158

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