共查询到20条相似文献,搜索用时 125 毫秒
1.
2.
硒在地球表面分布很不平均,大部分土壤中缺硒,造成了农产品普遍缺硒,从而引起人体缺硒,容易导致糖尿病、心脑血管系统疾病、癌症等多种疾病的发生。为了给人体补硒,科研人员一直在研制富硒食品。时下富硒食品在市场上价高又俏销,因此,开发富硒农产品不失为农民增收的一个亮点。 相似文献
3.
硒在人体和动物中的含量低于0.01%,但作用却不可替代。硒可以预防心脑血管疾病、癌症、糖尿病、白内障的发生,延缓衰老,提高免疫力。缺硒会引发多种疾病,严重影响健康。为了解决我国严重缺硒的状态,满足人们对高品质农产品的需求,胶州市生猪养殖合作社努力培育富硒猪肉。 相似文献
4.
5.
6.
针对我国有72%地区属于缺硒或低硒地区,2/3的人口存在不同程度的硒摄入不足的现状,研制强化硒香肠。通过采用天然色素着色方法取代亚硝酸盐的发色,并在该香肠中添加有机富硒粉,制成无硝富硒香肠。经感官评定,具有较好的感官指标;人体试验表明无硝富硒香肠具有一定的补硒效果。这将对广大缺硒地区的人群提供一条方便和安全的补硒途径。 相似文献
7.
8.
9.
施用作物富硒增产剂对花生硒含量及产量的影响 总被引:1,自引:0,他引:1
硒是一种人体必需的微量元素.人体缺硒会造荚果进行硒含量测定(见表2).成多种疾病,但由于硒在地壳中的分布不均匀,造成动植物的食品中硒含量存在地区性及地带性差异,地区间人体中存在硒摄人量不足.因此,目前富硒食品已成为食品研究开发的热点之一. 相似文献
10.
11.
[目的]根据不同地质背景的环境质量和产出富硒农产品的质量,评价不同研究区富硒农产品的优劣.[方法]研究了汕头市后坪、林招、金浦、兴平、东坑5个富硒土壤区Se的分布特征、成因来源以及所产出的富硒农产品,分析了研究区Se的迁移、转化和富集规律,按地质背景的不同分析了土壤有益元素、有毒有害元素的含量及其对农产品品质和富硒能力的影响.[结果]农产品的富硒主要受农产品类型、地质背景特征和土壤Se有效性的影响.[结论]农产品富硒的机制和Se的来源主要受不同地质背景下农产品对重金属元素吸收系数及营养元素含量高低的影响. 相似文献
12.
13.
富硒土壤硒含量及其与土壤理化性状的关系——以江西丰城为例 总被引:7,自引:0,他引:7
为了解富硒土壤的硒含量及其分布特征,明确土壤硒与主要土壤性状指标的关系,选择江西丰城地区不同硒水平的水田和旱作农田,于2014年9月选取了14个村落于作物收获后布设土壤剖面采样点。在0~100 cm的土壤剖面进行分层(20 cm)取样,测定土壤全硒含量及主要理化性状。结果表明,丰城地区农田土壤(0~20 cm)全硒平均含量(算术平均值)为0.49 mg·kg~(-1),41.2%的农田土壤高于0.4 mg·kg~(-1),99%高于0.125 mg·kg~(-1)。1 m剖面中土壤硒含量在0~20 cm最高,硒含量随着土壤深度的增加而逐渐降低,且在60 cm以下基本保持不变。富硒条件下,水田土壤硒含量在0~40 cm土层上显著高于旱地土壤;非富硒条件下,二者的全硒含量在1 m土体上无显著差异。土壤有机质含量对土壤全硒含量有决定性影响,而黏粒仅对水田土壤硒有显著影响。p H对土壤全硒含量呈现抑制作用,而土壤总铁、总铝和阳离子交换量对土壤全硒呈现富集效应。研究表明,在富硒地区,水田比旱地更有利于土壤硒的积累,提高土壤肥力水平对增加土壤硒含量有显著作用。 相似文献
14.
硒(Se)作为人和动物必需的微量元素之一,在维持机体健康等方面发挥着重要作用。鉴于目前我国部分缺硒地区人均日摄入硒量仍不能满足卫生行业标准(WS/T 578.3—2017)推荐量,因此,寻找硒富集量大、有机硒转化效率高且生物可利用率高的硒强化材料的任务依然迫切。硒在生物体新陈代谢过程中多与氨基酸结合,进而参与构成蛋白质。蚯蚓是一类蛋白质含量较高的土壤动物,系统分析了蚯蚓对硒的富集转化、蚓体硒的生物可利用率、硒对蚯蚓生长繁殖和蚓体营养成分的影响,并对蚯蚓作为动物源硒强化材料的应用潜力进行了讨论与展望,以期为富硒农业产业的发展提供一定的理论依据和科学支持。 相似文献
15.
16.
通过田间试验,研究了生物肥和粉煤灰、秸秆干馏液配合施用共4种不同调控措施对强酸性高硒茶园土壤上茶叶硒含量、土壤理化性质和土壤硒有效性的影响。结果表明,4种调控措施不同程度地提高了土壤中有效硒含量和茶叶硒含量,由高到低依次为:生物肥处理>粉煤灰-秸秆干馏液-生物肥复合处理>粉煤灰-生物肥复合处理>秸秆干馏液-生物肥复合处理;对土壤pH值提高幅度的大小次序为:粉煤灰-秸秆干馏液-生物肥复合处理>粉煤灰-生物肥复合处理>生物肥处理>秸秆干馏液-生物肥复合处理;另外,4种不同措施对改善酸化茶园土壤其他理化性质也呈现不同效果,其中秸秆干馏液-生物肥复合处理的综合效果较差。研究结果对于江苏高硒地区土壤中硒素的有效利用和加快发展富硒茶产业具有实际的参考价值和重要的指导意义。 相似文献
17.
ZHOU Jun LIU Jianping BAI Xin ZHANG Ying 《东北农业大学学报(英文版)》2007,14(4):337-339
The base of non-pollution agricultural products is a prerequisite for the non-pollution agricultural production.Based on two factors,i.e.,irrigation water and soil,the environmental quality of Yilan county's base of non-pollution agricultural products was evaluated by single pollution index.The main monitoring items included the content of Hg,Se,Cr,Pb,fluoride,and so on,and the evaluating results showed P i <1 which indicated that this area was fit for developing not only non-pollution products but also greenfood of A level. 相似文献
18.
[目的]研究有机硒粉对蚕豆根尖细胞的影响以及对亚硝酸钠引起微核的拮抗作用,为合理利用有机硒元素提供参考依据。[方法]以蚕豆根尖为材料,以亚硝酸钠为生物诱变剂,利用微核检测技术研究不同浓度有机硒粉对蚕豆根尖细胞的影响。[结果]在所研究浓度范围内,低浓度有机硒粉可以抑制蚕豆根尖细胞微核的发生,高浓度对微核的形成有促进作用;同时,在所研究浓度范围内,有机硒溶液均可抑制由亚硝酸钠引起的微核形成。[结论]适量有机硒溶液可拮抗有毒物质亚硝酸钠对蚕豆根尖细胞内染色体的破坏作用,因此在补充硒元素时应注意适量的原则。 相似文献
19.
Selenium distribution and nitrate metabolism in hydroponic lettuce(Lactuca sativa L.): Effects of selenium forms and light spectra 下载免费PDF全文
A deficiency in selenium(Se) in the human diet is a worldwide problem. The intake of Se-rich vegetables can be a safe way to combat Se deficiency for humans. However, most leafy vegetables can accumulate a high content of nitrates, which poses a potential threat to human health. Light is an important environmental factor that regulates the uptake and distribution of mineral elements and nitrogen metabolism in plants. However, the effects of Se forms and light conditions, especially light spectra, on the uptake and translocation of Se and on nitrate reduction are poorly understood. In this study, lettuce(Lactuca sativa L.) was treated with exogenous Se applied as selenate(10 mmol L~(-1)) and selenite(0.5 mmol L~(-1)) and grown under five different light spectra: fluorescent light(FL), monochromatic red LED light(R), monochromatic blue LED light(B), and mixed red and blue LED light with a red to blue light ratio at 4(R/B=4), 8(R/B=8), and 12(R/B=12), respectively. The effects of light spectra and Se forms on plant growth, photosynthetic performance, Se accumulation and nitrate reduction were investigated. The results showed that the light spectra and Se forms had significant interactions for plant growth, foliar Se accumulation and nitrate reduction. The Se concentration and nitrate content in the leaves were negatively correlated with the percentage of red light from the light sources. Compared to Se applied as selenite, exogenous Se applied as selenate was more effective in reducing nitrate via promoting nitrate reductase and glutamate synthase activities. The lowest nitrate content and highest plant biomass were observed under R/B=8 for both the selenate and selenite treatments. The significant effect of the light spectra on the root concentration factor and translocation factor of Se resulted in marked variations in the Se concentrations in the roots and leaves. Compared with FL, red and blue LED light led to significant decreases in the foliar Se concentration. The results from this study suggest that the light spectra can contribute to Se distribution and accumulation to produce vegetables with better food quality. 相似文献
20.
Variation in spectral characteristics of dissolved organic matter derived from rape straw of plants grown in Se-amended soil 下载免费PDF全文
JIA Wei ZHAO Xiao-hu ZHAO Yuan-yuan XU Jia-yang MING Jia-jia CAI Miao-miao HU Cheng-xiao 《农业科学学报》2020,19(7):1876-1884
Straw return is an effective management practice. It not only utilizes agricultural waste but also introduces dissolved organic matter(DOM) into the soil. Selenium(Se) is an essential trace element in the human diet and contributes to the popularity of Se-enriched agricultural products in the Chinese market. Moreover, there are still some Se-enriched agricultural products that have yet to be utilized. This study investigated whether Se addition in soil caused component changes in the DOM extracted from rape straw. DOM extracted from rape straw grown in soil with four Se levels(0, 0.1, 0.5 and 1.0 mg Se kg–1 soil) was characterized by UV-Visible spectroscopy, fluorescence spectroscopy and FTIR spectroscopy. The UVvisible spectra revealed that 0.1 mg Se kg–1 soil reduced the molecular weight of DOM and caused the presence of more irreplaceable aromatic structures in the substituent groups of the DOM, while 0.5 and 1.0 mg Se kg–1 soil only reduced the DOM molecular weight. Fluorescence spectroscopy indicated that Se improved the humification degree but reduced the aromaticity of DOM. FTIR spectra proved that Se altered the contents of carboxylic acids, amino acids, alcohols and aromatic heterocycles in DOM, which were maximized in the 0.5 and 1.0 mg Se kg–1 treatment groups. We concluded that Se application could change the composition of DOM extracted from rape straw, potentially impacting the nutrient bioavailability in soil. This study provides basic data on Se-enriched rape straw utilization for eco-agriculture. 相似文献