腐殖酸和水旱轮作对镉污染土壤种植的稻糙米品质的影响

为了解腐殖酸和水旱轮作共同作用对镉污染土壤中种植的水稻稻糙米品质的影响,采用随机组合设计进行了土壤盆栽试验,在水旱轮作的两种土壤（稻田土和菜田土）中添加0、0.1、1.0和10.0 g/m2的腐殖酸,测定糙米中重金属镉元素以及微量营养元素铁、锌、镁和钙的含量。结果表明,在稻田土和菜田土中分别添加10.0和1.0 g/m2腐殖酸时,糙米中镉含量分别比空白对照降低了40%和14.8%;添加腐殖酸处理的水稻,其糙米中必需元素Fe、Zn、Mg和Ca的含量均比未添加腐植酸处理的高,且差异显著;尤其是当腐殖酸添加量为1.0 g/m2时,糙米中Mg含量增加了50.42~72.60 mg/kg;另外,水旱轮作降低了糙米中的镉元素含量,也提高了微量营养元素的含量。这说明腐殖酸和水旱轮作共同作用有利于提高水稻糙米的品质。

Effects of Humic Acid and Paddy-Upland Rotation on Rice Quality in Cadmium Contaminated Soil

In order to understand the interaction effects of humic acid and paddy-upland rotation on rice quality in cadmium contaminated soil, a pot experiment was set up in the method of random block design, humic acid was 0, 0.1, 1 and 10 g/m2 meter in two kinds of soil with paddy-upland rotation, the content of cadmium in brown rice would be determined after harvest, the contents of microelements of iron, zinc,magnesium and calcium in brown rice would be determined in the meantime. The results showed that with increasing humic acids in the two kinds of soils, the content of cadmium in brown rice and the soil cadmium absorption coefficient were decreased, 40% off in rice fields and14.8% off in vegetable fields. while the content of essential elements of iron, zinc, magnesium and calcium in rice were increased significantly, especially when the humic acids reaching 1 g/m2, the content of Mg had increased 50.42~72.60 mg/kg. In addition,paddy-upland rotation not only reduced the cadmium content in brown rice but increased the contents of microelements. The study can conclude that the integration of humic acid and paddy-upland rotation is good for the improvement the quality of brown rice.