利川市耕地硒资源分布研究

目的]研究湖北省利川市耕地硒含量及资源分布情况,为当地兴办富硒产业及开发富硒农产品提供科学依据。方法]以农户责任田自然地块为采样单元,采集利川市621个耕地土样,测定全硒含量,分析硒资源分布情况。结果]利川耕地土壤的全硒含量为0．011~6.121 mg/kg,平均值为0.439 mg/kg,处于富硒水平；耕地土壤硒含量与土壤有机质有一定相关性,相关系数为0.2878,但与土壤pH相关性不明显。境内耕地富硒土壤呈不规则“y”字型分布,文斗、忠路、沙溪为粗壮的“y”脚,由西南角向东北、西北方向延伸。耕地全硒0.900 mg/kg以上的采样点集中分布于忠路文斗带、齐岳山脉(含福宝山)、寒池山脉和麻山山脉4个区域。耕地硒含量与煤关系紧密,含硒较高的4个区域均有大小不等的煤矿资源。缺硒地区主要分布在柏杨镇及齐岳山以西的建南镇、谋道镇。结论]初步摸清了利川耕地硒含量及分布规律。

Distribution of Selenium Resources in Cultivated Land of Lichuan City

Objective] To research the selenium content and resource distribution of cultivated land in Lichuan City of Hubei Province, and to provide scientific references for the development of selenium enrichmentindustry and the selenium enrichment agricultural products. Meth-od] With natural plot of household responsible field as the sampling unit, we detected the total selenium content in 621 soil samples of cultivat-ed land in Lichuan City, and analyzed the resource distribution of selenium. Result] The total selenium content in cultivated soil of Lichuan City was 0. 011-6. 121 mg/kg;the mean value was 0. 439 mg/kg, which was at a level of selenium enrichment. Selenium content in cultivat-ed soil had certain correlation with the organic matter in soil and the correlation coefficient was 0. 287 8. But it had no significant correlation with soil pH. Selenium-enrichment cultivated soil showed a “y”-type distribution. Wendou, Zhonglu and Shaxi were sturdy “y” type, which extended from southwest to northeast and northwest. Sampling sites with more than 0. 900 mg/kg selenium content in cultivated land were mainly concentrated in Wendou and Zhonglu belt, Qiyue mountain range ( containing Fubao Mountain) , Hanchi mountain range and Mashan mountain range. Selenium content in cultivated land had close correlation with coal. The four regions having relatively high selenium content all had coal mineral resources. Areas lacking of selenium were mainly distributed in Boyang Town and Jiannan and Moudao Towns in west Qiyue Mountain. Conclusion] Selenium content and distribution law in Lichuan City are preliminarily found out.