农业资源与环境学报Issue(1)：42-49,8.DOI:10.13254/j.jare.2014.0192
钾肥对镉污染土壤大白菜品质的效应研究
Effects of Potash Fertilizer on Cabbage's Quality in Cadmium Polluted Soils
摘要
Abstract
In order to further explain how potassium affect the quality of cabbage growing in cadmium contaminated soils, a pot experiment was carried out to study the effect of different dosages of potash fertilizer on the cabbage yield, physiological characteristics(the concentration of chlorophyll and the activity of antioxidative enzyme)and heavy metal concentration in two cadmium contaminated soils. The result showed that cabbage’s fresh weight above ground and underground decreased 2.6%and 19.8%respectively in low cadmium stress, while decreased 7.1%and 45.5%in high cadmium stress. After increasing the dosage of potash fertilizer in low concentration cadmium polluted soil, cabbage’s fresh weight above ground increased by 0.3%~34.0%and the underground part decreased by 1.2%~7.4%. At the same time, after application of potash fertilizer in high concentration stress, cabbage’s fresh weight above ground had no significant change while the underground part significantly increased by 41.8%~87.3%. The concentration of chlorophyll a and chlorophyll b in cabbage leaves increased slightly in low cadmium stress, after application of potash fertilizer, the concentration of chlorophyll a increased greatly but chlorophyll b had no obvious change. The concentration of chlorophyll a and chlorophyll b in cabbage leaves decreased greatly in high cadmium stress and it had no tremen-dous change after application of potash fertilizer. The activity of antioxidative enzymes(CAT, SOD and POD)in cabbage leaves were strength-ened in low cadmium stress while the activity of kinds of antioxidative enzymes in cabbage leaves were weakened in high cadmium stress. Af-ter application of potash fertilizer in two cadmium polluted soils, all kinds of enzyme activity had a trend to increase. Applying potash fertiliz-er into the cadmium contaminated soils could effectively increase the concentration of vitamin C, reducing sugar and promote the free amino acids transforming into crude protein. The concentration of heavy metal cadmium and arsenic significantly increased, but lead, chromium and mercury universally decreased in cadmium stress. From this study we found that application of potash fertilizer could effectively improve the quality of cabbage, especially decrease the concentration of various heavy metals in cabbage’s leaves and the recommended dosage was 200~400 mg·kg-1 in low cadmium stress and 400~600 mg·kg-1 in high cadmium stress.关键词
镉/钾肥/大白菜/品质/生理特性/重金属Key words
cadmium/potash fertilizer/cabbage/quality/physiological characteristics/heavy metal分类
农业科技引用本文复制引用
王小晶,陈怡,王菲,王正银..钾肥对镉污染土壤大白菜品质的效应研究[J].农业资源与环境学报,2015,(1):42-49,8.基金项目
国家公益性行业（农业）科研专项（201203013-5）；国际植物营养研究所（IPNI）资助项目 （）
