论文部分内容阅读
随着经济社会的快速发展,茶园土壤重金属污染问题日趋严重,不仅影响茶叶的生长和品质,也威胁着人类的健康。以江浙两省优质名茶种植园为例,利用地统计学方法对茶园土壤重金属含量、相关关系及空间异质性等特征进行分析。结果表明:①东山镇土壤Zn超标率最高,达到67.50%;其次是溪龙乡土壤Se,达到50.00%;其他土壤重金属的超标率均比较低。②酸性条件及丰富的有机质有利于土壤Se的贮存,且土壤Se与土壤Cd、As极易共存,但不易与土壤Cu、Zn共存。③土壤重金属含量空间分布受结构性因素和随机性因素共同作用的影响,溪龙乡土壤Cd块金系数为0.890,受随机性因素影响最大;而溪龙乡土壤As块金系数为0.049,受随机性影响因素最小。④各重金属空间分布特征不同,为改善茶园土壤环境,提高茶叶品质,应结合重金属空间分布规律对其进行有效监管并提出有针对性的治理措施。
With the rapid economic and social development, the problem of heavy metal pollution in tea garden soil is becoming more and more serious. It not only affects the growth and quality of tea but also threatens human health. Taking the high-quality famous tea plantations in Jiangsu and Zhejiang provinces as an example, this paper analyzed the characteristics of heavy metal content, correlation and spatial heterogeneity in tea plantation soils using geostatistics. The results showed that: ① The highest Zn exceeded the standard in Dongshan Town, reaching 67.50%; followed by Se Long in Xianglong Township, reaching 50.00%; and the over-standard rates of heavy metals in other soils were relatively low. ② acidic conditions and rich organic matter are beneficial to the storage of Se in soils, and soil Se and Cd and As can easily coexist, but are not easy to coexist with soil Cu and Zn. (3) The spatial distribution of heavy metal content in soils is affected by the combined effect of structural factors and random factors. The nugget coefficient of Cd in Xilong Township is 0.890, which is the most affected by random factors. The As-gold coefficient of Asil soil is 0.049 Randomness of the least influential factors. (4) The spatial distribution characteristics of heavy metals are different. In order to improve the soil environment of tea plantation and improve the quality of tea, the regulation of space distribution of heavy metals should be effectively regulated and targeted management measures should be put forward.