不同退耕年限下菜子湖湿地土壤Cu和Zn形态特征

发布时间：2018-09-14 15:27

【摘要】：以安庆市菜子湖不同退耕还湖年限(3 a,5 a,7 a,9 a,11 a,21 a)的湿地、仍耕油菜地和原始湿地土壤为研究对象,研究不同退耕年限下湿地土壤重金属Cu和Zn的各赋存形态变化特征。结果表明:退耕后湿地土壤Tot-Zn和Tot-Cu含量随退耕年限增加而呈增加趋势;土壤Cu和Zn的各赋存形态分布比率不同,但均以残渣态含量为主,残渣态Cu、Zn分别占总含量的42.55%~62.40%和40.75%~71.18%;土壤Cu和Zn各赋存形态含量大小的顺序分别为:残渣态(RES-Cu:10.11~19.86 mg kg-1)有机结合态(OM-Cu:4.40~12.07 mg kg-1)铁锰氧化态(RED-Cu:2.24~6.94 mg kg-1)碳酸盐结合态(CARB-Cu:0.65~1.99 mg kg-1)可交换态(EXC-Cu:0.03~0.41 mg kg-1)和残渣态(RES-Zn:12.79~27.71 mg kg-1)铁锰氧化态(RED-Zn:5.37~23.27 mg kg-1)有机结合态(OM-Zn:2.49~8.31 mg kg-1)可交换态(EXC-Zn:0.02~4.95 mg kg-1)碳酸盐结合态(CARB-Zn:0.00~2.87 mg kg-1);随着退耕年限增加湿地土壤Cu和Zn各个形态变化趋势存在差异,讨论结果表明退耕还湖后湿地淹水条件和植被恢复状况改变,导致湿地土壤理化性质变化,进而影响了湿地土壤Cu和Zn的形态组分、总量及生物有效性。
[Abstract]:The wetland with different returning years (3 a, 5 a, 7 a, 9 a, 11 a, 21 a) from Caizi Lake, Anqing City, was used to study the morphological changes of heavy metals (Cu and Zn) in wetland soil, which were still cultivated in rapeseed field and original wetland soil. The results showed that the contents of Tot-Zn and Tot-Cu in wetland soil increased with the increase of returning years, and the distribution ratio of soil Cu and Zn was different, but the content of residual form was the main one. Residual Cu,Zn accounted for 62.40% and 40.75% of the total content, respectively, and the order of the contents of soil Cu and Zn was as follows: residual state (RES-Cu:10.11~19.86 mg kg-1), organic bound state (OM-Cu:4.40~12.07 mg kg-1), ferromanganese oxide state (RED-Cu:2.24~6.94 mg kg-1), carbonate bound state (CARB-Cu:0.65~1.99 mg kg-1), exchangeable state, respectively. (EXC-Cu:0.03~0.41 mg kg-1) and (RES-Zn:12.79~27.71 mg kg-1) Fe-Mn oxide (RED-Zn:5.37~23.27 mg kg-1) organic bound state (OM-Zn:2.49~8.31 mg kg-1) exchangeable state (EXC-Zn:0.02~4.95 mg kg-1) carbonate bound state (CARB-Zn:0.00~2.87 mg kg-1), with the increase of returning years, the variation trend of Cu and Zn in wetland soil were different. The results showed that the changes of flooded condition and vegetation restoration condition of wetland after returning farmland to lake resulted in the change of soil physical and chemical properties, and then affected the morphological composition, total amount and bioavailability of Cu and Zn in wetland soil.
【作者单位】：安徽师范大学国土资源与旅游学院;
【基金】：国家自然科学基金项目(No.41001369,41301249) 安徽省自然科学基金项目(No.1308085MD22)资助
【分类号】：S153.6;X53

【相似文献】