To provide reference for selenium resource exploitation of soil,many selenium-tolerant strains were isolated from selenium-rich soil in Guangxi. The dilution spread plate method and selenium-added culture method were ...To provide reference for selenium resource exploitation of soil,many selenium-tolerant strains were isolated from selenium-rich soil in Guangxi. The dilution spread plate method and selenium-added culture method were used to screen the selenium-tolerant strains from the soils which were sampled from the main Selenium-rich areas such as Yongfu,Bama,Yulin Hanshan,Guiping and Tengxian. The results showed that 8 strains with high selenium tolerance were obtained,which could tolerate the selenium concentration above 10 000 μg/m L in solid medium. Among the 8 strains,YLB1-33 showed the highest selenium tolerance,and it could still grow weakly in the solid medium with selenium concentration of 29 000 μg/m L. The sequencing of 16 S rD NA and phylogenetic analysis showed that YLB1-6 was identified as Bacillus cereus,BMB2-1 and TXB1-8 were identified as Bacillus pumilus,GPB2-5 was identified as Bacillus thuringiensis,YLB1-26 and YLB1-33 were identified as Bacillus licheniformis,and YLB1-2 and YFB1-8 were identified as Serratia marcescens. The finding of selenium-tolerance strains had potential application value on promoting the utilization of selenium soil resources and the development of selenium-rich agricultural products in Guangxi.展开更多
According to the summary of many years of experiments, the application scope, basic demands, preparation before seeding, seeding demands, field management, mowing, transportation, storage, ledger management and other ...According to the summary of many years of experiments, the application scope, basic demands, preparation before seeding, seeding demands, field management, mowing, transportation, storage, ledger management and other technical requirements of technical regulations for planting of forage millet rich in selenium were studied, and specific measures and technical indicators of the technical regulations were analyzed, aiming to provide normalized, standardized, industrial and marketization technical support for the planting of forage millet rich in selenium.展开更多
针对澧阳平原西部高硒低重金属天然绿色富硒土地的形成机制,运用绝对主成分得分-多元线性回归(absolute principal component score-multiple linear regression,APCS-MLR)模型,对表层土壤中Se和Cd等主要重金属元素的来源及其贡献率进...针对澧阳平原西部高硒低重金属天然绿色富硒土地的形成机制,运用绝对主成分得分-多元线性回归(absolute principal component score-multiple linear regression,APCS-MLR)模型,对表层土壤中Se和Cd等主要重金属元素的来源及其贡献率进行定量解析,并结合地统计学方法,深入分析不同来源元素的分布特征。结果表明:研究区域土壤整体呈现良好的环境质量特征;烟花爆竹、非金属建材工业活动及相关的交通运输业对土壤中As、Cd、Cr、Ni、Cu、Pb、Zn等元素的含量水平产生了提升作用,但是影响范围和程度可控;研究区西部物源区的高硒含量与高Se/Cd比值是本区形成全国硒含量最高的天然绿色富硒土壤的关键因素;研究区长期的水稻种植显著增加了土壤中的硒次生富集,成为维持全域高Se/Cd比的核心补充机制。展开更多
With the improvement of living standards, people pay more attention to the agricultural products with health protection function, and the selenium-rich agricultural products attract more and more consumers. The main b...With the improvement of living standards, people pay more attention to the agricultural products with health protection function, and the selenium-rich agricultural products attract more and more consumers. The main biological role of selenium is to resist oxidation and inflammatory response, mainly focusing on resisting aging, preventing cardiovascular disease, protecting eyesight, counteracting or destroying the toxic properties, preventing cancer and thyroid disease. In most areas of China, there is a widespread shortage of selenium, thus producing selenium-rich agricultural products to provide natural selenium-rich health food to the areas in need of selenium, has gradually become a new hot spot of China's health food industry, but high content of selenium in food is detrimental to human body, even leads to selenium intoxication, and artificially adding inorganic selenium is difficult to guarantee that the selenium content of agricultural products is not exceeded. According to human body's daily demand for selenium in dietetics and the content of selenium in agricultural products in the Chinese food composition table, we put forward the recommendations on the standard of selenium in agricultural products, in order to provide the basis for China to formulate the health standard of selenium content in selenium-rich agricultural products.展开更多
[Objectives] The aim was to reveal the distribution of soil nutrients in Se-rich area of Hainan and to clarify their specific contents, so as to provide references for the development of Se-rich area agriculture in Ha...[Objectives] The aim was to reveal the distribution of soil nutrients in Se-rich area of Hainan and to clarify their specific contents, so as to provide references for the development of Se-rich area agriculture in Hainan.[Methods] With the se-rich area in Hainan as the object, field investigation and indoor analysis were combined to elucidate the nutrient status of cultivated soil in the area and analyze its nutrient distribution.[Results] The soil in the se-rich area in Hainan province was generally acidic with the average soil pH value of 5.0. The difference in soil pH between different landforms and different altitudes was not significant, ranging from 4.9 to 5.3. Soil available P and available K contents were low to intermediate, and the soil available N content was moderate. The farming system, chemical fertilizer application structure and meteorological factors were the main causes of the distribution of soil nutrient elements. The soil exchangeable calcium and magnesium content was rich, and the distribution of trace elements in the arable soil of different terrains and elevations was closely related to the distribution of soil parent material in the region. The increase of soil organic matter content in arable land could be achieved by increasing the application of organic fertilizer and guiding the farmers to enhance the application of straws to fields.[Conclusions] The application of soil N, P and K fertilizers should be combined with the application of soil organic fertilizers to improve the soil fertility of cultivated land.展开更多
基金Supported by the Program for the Scientific Research and Technology Development in Guangxi(Guikehe 415104001-22)the Science and Technology Planning Project of Guangxi(Guikegong 1598006-5-13)+2 种基金the Experiment Station for Selenium Featured Crops in Guangxi(Gui TS2016011)the Fund for Science and Technology Development and Scientific Research of Guangxi Academy of Agricultural Sciences(Guinongke 2015JM23,2017JM01,2017JM03)the Innovation-Driven Development Special Fund Project of Guangxi(Guike AA17202019-1&Guike AA17202019-4)
文摘To provide reference for selenium resource exploitation of soil,many selenium-tolerant strains were isolated from selenium-rich soil in Guangxi. The dilution spread plate method and selenium-added culture method were used to screen the selenium-tolerant strains from the soils which were sampled from the main Selenium-rich areas such as Yongfu,Bama,Yulin Hanshan,Guiping and Tengxian. The results showed that 8 strains with high selenium tolerance were obtained,which could tolerate the selenium concentration above 10 000 μg/m L in solid medium. Among the 8 strains,YLB1-33 showed the highest selenium tolerance,and it could still grow weakly in the solid medium with selenium concentration of 29 000 μg/m L. The sequencing of 16 S rD NA and phylogenetic analysis showed that YLB1-6 was identified as Bacillus cereus,BMB2-1 and TXB1-8 were identified as Bacillus pumilus,GPB2-5 was identified as Bacillus thuringiensis,YLB1-26 and YLB1-33 were identified as Bacillus licheniformis,and YLB1-2 and YFB1-8 were identified as Serratia marcescens. The finding of selenium-tolerance strains had potential application value on promoting the utilization of selenium soil resources and the development of selenium-rich agricultural products in Guangxi.
基金Supported by Special Fund for Agro-scientific Research in the Public Interest(2012-0304201)~~
文摘According to the summary of many years of experiments, the application scope, basic demands, preparation before seeding, seeding demands, field management, mowing, transportation, storage, ledger management and other technical requirements of technical regulations for planting of forage millet rich in selenium were studied, and specific measures and technical indicators of the technical regulations were analyzed, aiming to provide normalized, standardized, industrial and marketization technical support for the planting of forage millet rich in selenium.
文摘针对澧阳平原西部高硒低重金属天然绿色富硒土地的形成机制,运用绝对主成分得分-多元线性回归(absolute principal component score-multiple linear regression,APCS-MLR)模型,对表层土壤中Se和Cd等主要重金属元素的来源及其贡献率进行定量解析,并结合地统计学方法,深入分析不同来源元素的分布特征。结果表明:研究区域土壤整体呈现良好的环境质量特征;烟花爆竹、非金属建材工业活动及相关的交通运输业对土壤中As、Cd、Cr、Ni、Cu、Pb、Zn等元素的含量水平产生了提升作用,但是影响范围和程度可控;研究区西部物源区的高硒含量与高Se/Cd比值是本区形成全国硒含量最高的天然绿色富硒土壤的关键因素;研究区长期的水稻种植显著增加了土壤中的硒次生富集,成为维持全域高Se/Cd比的核心补充机制。
基金Supported by Hunan University Innovation Team FoundationHunan Science and Technology Plan Project (2011NK3093)
文摘With the improvement of living standards, people pay more attention to the agricultural products with health protection function, and the selenium-rich agricultural products attract more and more consumers. The main biological role of selenium is to resist oxidation and inflammatory response, mainly focusing on resisting aging, preventing cardiovascular disease, protecting eyesight, counteracting or destroying the toxic properties, preventing cancer and thyroid disease. In most areas of China, there is a widespread shortage of selenium, thus producing selenium-rich agricultural products to provide natural selenium-rich health food to the areas in need of selenium, has gradually become a new hot spot of China's health food industry, but high content of selenium in food is detrimental to human body, even leads to selenium intoxication, and artificially adding inorganic selenium is difficult to guarantee that the selenium content of agricultural products is not exceeded. According to human body's daily demand for selenium in dietetics and the content of selenium in agricultural products in the Chinese food composition table, we put forward the recommendations on the standard of selenium in agricultural products, in order to provide the basis for China to formulate the health standard of selenium content in selenium-rich agricultural products.
基金Supported by the Special Project for the Reform of Scientific Research Organization for No-profits(pzsfyl-201812)
文摘[Objectives] The aim was to reveal the distribution of soil nutrients in Se-rich area of Hainan and to clarify their specific contents, so as to provide references for the development of Se-rich area agriculture in Hainan.[Methods] With the se-rich area in Hainan as the object, field investigation and indoor analysis were combined to elucidate the nutrient status of cultivated soil in the area and analyze its nutrient distribution.[Results] The soil in the se-rich area in Hainan province was generally acidic with the average soil pH value of 5.0. The difference in soil pH between different landforms and different altitudes was not significant, ranging from 4.9 to 5.3. Soil available P and available K contents were low to intermediate, and the soil available N content was moderate. The farming system, chemical fertilizer application structure and meteorological factors were the main causes of the distribution of soil nutrient elements. The soil exchangeable calcium and magnesium content was rich, and the distribution of trace elements in the arable soil of different terrains and elevations was closely related to the distribution of soil parent material in the region. The increase of soil organic matter content in arable land could be achieved by increasing the application of organic fertilizer and guiding the farmers to enhance the application of straws to fields.[Conclusions] The application of soil N, P and K fertilizers should be combined with the application of soil organic fertilizers to improve the soil fertility of cultivated land.
