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[目的]研究组配改良剂对Cd污染稻田的修复效果。[方法]在湖南省长沙县春华镇污染稻田进行了组配改良剂的田间试验,设4个处理,分别为T_1:未添加改良剂(CK);T_2:生石灰(0.1%)翻耕整地时混施;T_3:TH01(0.4%)+生石灰(0.1%)翻耕整地时混施;T_4:翻耕整地时混施TH02(0.4%),分蘖前期撒施生石灰(0.1%)。研究添加改良剂对水稻产量、重金属含量和土壤重金属含量的影响。[结果]4个处理间水稻分蘖情况、子粒生物量差异不明显;T_3处理子粒的Cd含量最低,且T_3、T_4处理水稻子粒的Cd含量分别降低了45.22%、38.14%,而与T_2处理相比,T_3、T_4处理水稻子粒Cd含量分别降低36.16%、27.91%;不同生长期水稻茎叶、根Cd含量与土壤醋酸铵Cd含量呈线性相关关系。[结论]可在孕穗期后水稻进入灌浆期前采取农艺措施或添加稳定剂降低稻田土壤醋酸铵Cd含量,从而降低水稻子粒Cd含量。
[Objective] The research aimed to study the effect of improving agent on the remediation of Cd-contaminated paddy field. [Method] A field experiment was conducted in the contaminated paddy field of Chunhua Town, Changsha County, Hunan Province. Four treatments were set up, namely T 1: without CK; T 2: quick lime (0.1% T_3: TH01 (0.4%) + quicklime (0.1%) mixed during tillage and soil preparation; T_4: mixed with TH02 (0.4%) during tilling and soil preparation and quicklime (0.1%) at early tillering stage. Effects of adding improver on the yield of rice, heavy metal content and heavy metal content in soil were studied. [Result] The results showed that there was no significant difference in tillering among four treatments. The content of Cd in seedlings of T_3 treatment was the lowest, and the content of Cd in T_3 and T_4 treatments decreased by 45.22% and 38.14%, respectively. However, Compared with T_3 and T_4 treatment, the content of Cd in rice grain decreased by 36.16% and 27.91%, respectively. There was a linear correlation between the content of Cd in leaf and root and the content of ammonium acetate in soil at different growth stages. [Conclusion] Agronomic measures or addition of stabilizers could reduce the content of ammonium acetate in paddy soil and reduce the content of Cd in rice grain before heading stage after booting stage.