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云南耕地土壤硒含量空间分布及其影响因素研究
张丽1,2, 张乃明1,2, 张玉娟1,2, 邓洪1, 杨浩瑜1
1.云南农业大学;2.云南省土壤培肥与污染修复工程实验室
摘要:
硒(Se)是人体必需的微量元素,土壤中硒的含量直接影响食物链硒的摄入,位于中国西南边陲的云南土壤是否缺硒存在争议,至今缺乏对云南耕地土壤硒空间分布特征及影响因素的系统研究。本研究在云南采集了640个耕地表层土壤样品,对云南代表性耕地土壤硒含量空间分布特征及其影响因素进行研究。研究结果表明:(1)云南省耕地土壤硒总量变幅在0.05 ~ 7.12 mg/kg,平均含量为0.51 mg/kg,达到富硒水平;(2)不同成土母质发育的土壤硒含量差异较大,基型结晶盐类的玄武岩等发育的土壤硒含量最高,平均为0.77 mg/kg;(3)土壤类型对硒的含量影响明显,其中棕壤硒含量平均为1.24 mg/kg,显著高于其它土壤类型,石灰(岩)土硒含量最低仅为0.21 mg/kg;从行政区看位于滇东的曲靖市和昭通市土壤硒平均含量明显高于其它州市;(4)相关分析表明,土壤硒含量与pH值之间的相关性均没有达到显著水平;而土壤硒含量与土壤有机质呈极显著的正相关性(r = 0.110,p < 0.001),说明有机质影响土壤硒的含量。
关键词:  耕地土壤    空间分布  影响因素
DOI:
分类号:S159
基金项目:云南省重点研发计划(2018BC003);国家重点研发计划(2018YFD0800603)
Study on Spatial Distribution of Selenium Content and Its Influencing Factors in Cultivated Soil in Yunnan
ZHANG Li1, ZHANG Naiming1, zhangyunjuan2, denghong1, yanghaoyu1
1.Yunnan Agricultural University;2.Yunnan Soil Fertility and Pollution Remediation Engineering Laboratory
Abstract:
Selenium(Se) is an indispensable trace element in the human body. Selenium content in soil directly affects selenium intake in the food chain. Whether Se deficiency in Yunnan soil on the southwestern of China was inconclusive. A systematic study on the spatial distribution characteristics and influencing factors of Se in cultivated soil in Yunnan was still lacking. This study collected 640 cultivated surface soil samples in Yunnan. The distribution characteristics of soil Se content in Yunnan Province and its influencing factors were studied. The results showed that the total amount of Se in the surface soil of Yunnan Province ranged from 0.05 to 7.12 mg/kg, with an average content of 0.51 mg/kg, reaching a Se-rich level. Differences in soil Se content between different parent materials. The Se content of soils such as basic crystalline salt basalts was the highest, with an average of 0.77 mg/kg. Soil type had a significant effect on Se content. The Se content of brown soil was significantly higher, with an average of 1.24 mg/kg. The lowest was 0.21 mg/kg in lime soil. The average soil Se content in Qujing and Zhaotong cities in the study area was higher than in other areas. Correlation analysis showed that the correlation between soil selenium content and pH did not reach a significant degree. And soil Se content had a very significant positive correlation with soil organic matter (r = 0.110, p <0.001), indicating that organic matter affects soil Se content.
Key words:  Cultivated soil  Selenium  Spatial distribution  Influencing factors

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