【摘要】 为安全利用秸秆资源,选取四川省绵竹市Cd污染稻田为研究对象,开展小区试验,研究秸秆还田配施石灰、尿素和腐熟剂对土壤特性以及2个水稻品种(低富集水稻品种‘川优6203’、高富集水稻品种‘宜香2115’)的Cd吸收累积和产量的影响。结果表明:与对照(CK)相比,秸秆还田配施石灰后土壤pH值显著提高(P<0.05),土壤溶解性有机碳(DOC)含量轻微增加,土壤有效态Cd含量有效降低;配施尿素后土壤p H值、DOC含量和有效态Cd含量轻微增加;而配施腐熟剂则能有效降低土壤pH值,显著提高DOC含量和土壤有效态Cd含量(P<0.05)。秸秆还田配施石灰后,稻米Cd含量减少13.1%～14.4%,而配施尿素和腐熟剂后,稻米Cd含量则分别增加3.4%～13.1%和21.2%～35.6%;配施石灰、尿素和腐熟剂均能增加水稻产量,增幅分别为5.7%～7.1%、9.4%～9.7%和10.6%～11.4%。综合考虑水稻Cd吸收累积以及产量,成都平原秸秆还田配施石灰技术是较为理想的秸秆安全利用模式。更多还原

【Abstract】 To make use of straw resources safely,we select the Cd-contaminated paddy in Mianzhu County of Sichuan Province as the research object to carry out plot experiment,and study the effects of returning straw added with lime,urea and straw-decomposing inoculant on soil properties,Cd accumulation and yields of two rice varieties(low-enriched rice variety’Chuanyou 6203’and high-enriched rice variety ’Yixiang 2115’).The results showed that compared with the control(CK),returning straw added with lime significantly increased soil pH value(P<0.05),slightly increased the concentration of soil dissolved organic carbon(DOC),and decreased the concentration of soil available Cd;returning straw added with urea slightly increased soil pH value,DOC,and available Cd concentrations,while returning straw added with straw-decomposing inoculant decreased soil pH value,significantly increased soil DOC and available Cd concentrations(P<0.05).Compared with CK,returning straw added with lime decreased the rice Cd concentration by 13.1%-14.4%,while straw returning combined with urea and straw-decomposing inoculant application increased the rice Cd concentration by 3.4%-13.1% and 21.2%-35.6%,respectively.Straw returning with lime,urea and strawdecomposing inoculant increased the yields of rice by 5.7%-7.1%,9.4%-9.7% and 10.6%-11.4%,respectively.Considering Cd absorption and yields of rice,we suggest that straw returning with lime is an ideal model for the safe utilization of straw in Chengdu Plain.更多还原