寧夏平羅縣井渠結(jié)合灌區(qū)地下水鹽運(yùn)移規(guī)律研究
本文選題:井渠結(jié)合灌區(qū) + 地下水; 參考:《水利水電技術(shù)》2017年03期
【摘要】:以綜合治理井渠結(jié)合灌區(qū)土壤鹽堿化為目標(biāo),針對寧夏平羅縣井渠結(jié)合灌區(qū)下游灌水難、排水難和鹽堿化嚴(yán)重等問題,采用渠灌井排、井溝聯(lián)合使用等措施,對作物進(jìn)行適量和適時(shí)灌溉,充分利用地下水資源,并監(jiān)測井渠結(jié)合灌溉條件下田間土壤含鹽量、地下水礦化度和水位埋深的變化情況,分析地下水埋深和礦化度對土壤含鹽量的影響。結(jié)果表明:井渠結(jié)合灌溉對降低地下水位效果顯著。以黃河水為主要灌溉水源的寧夏銀北自流灌區(qū),地下水礦化度變化幅度較小;灌溉后的土壤表層含鹽量驟降,0~40 cm土層的鹽分變化較大;土壤鹽分與地下水礦化度具有較強(qiáng)的線性正相關(guān)性,與地下水埋深呈負(fù)相關(guān)。研究成果對干旱半干旱區(qū)灌區(qū)水資源優(yōu)化配置、鹽堿地改良具有參考價(jià)值。
[Abstract]:Aiming at the aim of comprehensive treatment of soil salinization in well and canal combined irrigation area in Pingluo County, Ningxia, aiming at the problems of difficult irrigation, difficult drainage and serious salinization in the lower reaches of well and canal combined irrigation area in Pingluo County of Ningxia, the measures such as canal irrigation and well drainage and combined use of well and ditch are adopted. Proper and timely irrigation of crops, making full use of groundwater resources, and monitoring the changes of soil salinity, groundwater salinity and water table depth in the field under the condition of well and canal irrigation combined with irrigation, The effects of groundwater depth and salinity on soil salinity were analyzed. The results show that the well-canal combined irrigation has remarkable effect on lowering groundwater level. The variation of groundwater salinity in Yinbei Artesian Irrigation area of Ningxia with Yellow River water as the main irrigation water source is relatively small, and the salt content in the surface layer of the irrigated soil decreases sharply in the soil layer of 40 cm. There is a strong linear positive correlation between soil salinity and groundwater salinity, and a negative correlation between soil salinity and groundwater depth. The research results have reference value for the optimal allocation of water resources and the improvement of saline-alkali land in arid and semi-arid irrigated areas.
【作者單位】: 寧夏回族自治區(qū)水利科學(xué)研究院;
【基金】:水利部世行節(jié)水灌溉項(xiàng)目“寧夏回族自治區(qū)平羅縣土壤鹽堿化綜合治理措施應(yīng)用研究與推廣”(NXPLS1200)
【分類號】:S27;S156.4
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