朱成立, 郭相平, 刘敏昊, 汤树海. 水稻沟田协同控制灌排模式的节水减污效应[J]. 农业工程学报, 2016, 32(3): 86-91. DOI: 10.11975/j.issn.1002-6819.2016.03.013
    引用本文: 朱成立, 郭相平, 刘敏昊, 汤树海. 水稻沟田协同控制灌排模式的节水减污效应[J]. 农业工程学报, 2016, 32(3): 86-91. DOI: 10.11975/j.issn.1002-6819.2016.03.013
    Zhu Chengli, Guo Xiangping, Liu Minhao, Tang Shuhai. Reduction of nitrogen, phosphorous and runoff by coordination controlled drainage with basin and ditch in paddy field[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2016, 32(3): 86-91. DOI: 10.11975/j.issn.1002-6819.2016.03.013
    Citation: Zhu Chengli, Guo Xiangping, Liu Minhao, Tang Shuhai. Reduction of nitrogen, phosphorous and runoff by coordination controlled drainage with basin and ditch in paddy field[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2016, 32(3): 86-91. DOI: 10.11975/j.issn.1002-6819.2016.03.013

    水稻沟田协同控制灌排模式的节水减污效应

    Reduction of nitrogen, phosphorous and runoff by coordination controlled drainage with basin and ditch in paddy field

    • 摘要: 南方地区水稻生长期暴雨较多,高施肥量下的稻田易使大量氮磷随排水流失,导致水体环境恶化。该文提出稻作区沟田协同控制灌排技术的概念,即在农田蓄雨控排的基础上,利用农沟对农田排水再次拦截,并滞蓄农沟控制区内沟渠、道路以及农田侧渗排水,利用农沟和农田的湿地效应,减少排水量及氮磷浓度,降低污染物负荷。2013年采用大田试验,测试农田和农沟尺度上的灌排水量、灌排次数和氮磷流失量,对上述模式进行验证。结果表明,农田尺度上,蓄雨控排模式较对照处理(浅水勤灌)需水量和耗水量减少18.8%和15.3%,灌溉定额和地面排水量分别减少28.0%和60.6%,氮、磷负荷分别减少58.6%和58.8%,灌水次数减少4次,处理间差异显著(P<0.05),处理间籽粒产量无显著差异(P>0.05)。农沟尺度上,沟田协同控制灌排技术较非控排模式排水量减少55.9%,总氮和总磷负荷分别减少59.7%和66.7%;降雨初期农田和农沟水中氮磷浓度高且随滞留时间衰减较快,控制排水能有效减少氮磷负荷;渗漏水量中氮磷浓度较低。沟渠、道路等非农田的地面排水量占沟道总排水量的31.3%~38.7%,也是重要的氮磷负荷来源。结果表明沟田协同控制灌排技术具有较好的节水、省工和减排、控污效果,对南方稻作区灌排管理具有指导意义。

       

      Abstract: Abstract: Heavy rains occur frequently in South China during rice growth stages. The large amount of discharge from paddy field combined with high fertilization has caused serious environmental problems. The present controlled drainage methods pay much attention to holding more water in basins and reducing pollutant from basins, however, how to control runoff from field ditches and non-cultivated areas are often ignored. Coordinated Controlled Drainage (CCD) was proposed in the paper to solve the problem above by making most use of the wetland effects of both paddy field and field ditches that were widely distributed in the farmland in South China. The CCD technique tries to store rainwater in basins as much as possible by using rain-catching and controlled irrigation (RCCI) technique that maintains lower irrigation limit and higher water depth after rain depending on the waterlogging-tolerant and drought-tolerant ability of rice so as to reduce runoff from basins. Furthermore, it also impouned runoff from basins and non-cultivation lands such as roads, ditches and canals by a construction at the outlet of the field ditch. Field experiments were conducted in 2013 to verify the feasibility of the model. Controlled and uncontrolled drainages treatments were designed in rice field. Each controlled field of 4.5 hm2. Three replicates were designed. During the experiment, the drainage from field and trench were collected for determination of total nitrogen and phosphorus (TN and TP). Rice yield was measured. The results showed that at field scale, CCD could reduce evaportanspiration and water consumption by 18.8% and 15.3%, compared with frequent and shallow irrigation technique (FSI) respectively. Irrigation quote, drainage quote and irrigation frequency declined 28%, 60.6% and 4 times while TN and TP loss reduced 58.6% and 58.8%. At field control scale, surface drainage volume, the TN and TP burden from controlled ditch decreased by 55.9%, 59.7% and 66.7%, respectively under CCD without reduction of grain yield compared with uncontrolled ditch combined with FSI. The investigation also found that TP and TN concentrations were high both in basin water and ditch water at early stage after rainfall and decreased rapidly with time, indicting that holding water in basins and ditches at that time could remove TN and TN more efficiently. Runoff from non-cultivated area accounted for 31.3%-38.7% of the total runoff from ditches, indicating it was an important source of pollutant. The results above suggested CCD was an effective method to reduce water application, cost of labor, and pollutant burden in paddy field in South China.

       

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