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浔郁平原不同作物的硒富集特征及其影响因素
陈锦平1, 刘永贤1, 潘丽萍1, 吴天生2, 杨 彬3, 邢 颖1, 廖 青1, 梁潘霞1, 江泽普1
1.广西农业科学院农业资源与环境研究所/广西富硒农业研究中心;2.广西地质调查院;3.广西贵港市富硒农产品开发领导小组办公室
摘要:
作物中的硒含量是影响食物链硒水平的关键因素。以浔郁平原土地质量地球化学评价项目中的农作物调查结果和多年定位试验结果为基础,探究不同作物对土壤硒的富集特征及其影响因素。结果表明:浔郁平原的覃塘、港南、桂平市和平南县等4个县(市、区)的水稻富硒率均高于86%。花生、黄豆、玉米和水稻的天然富硒率最高,富硒率依次为100%、100%、100% 和89%。水稻根、茎、籽粒的生物富集系数依次下降,分别为 0.663、0.130和0.108,水稻籽粒的生物富集系数远高于龙眼、荔枝和甘蔗。根系土与水稻籽粒硒含量的相关系数为0.660,远高于龙眼和荔枝。港南区作物硒与土壤pH相关系数为0.342,在碱性土壤中甘蔗茎的硒含量(0.012 1 mg/kg)最高,在酸性土壤中水稻的硒含量(0.065 3 mg/kg)最高。本研究中,以种子为可食部分的作物其天然富硒率较高,土壤硒含量和土壤酸碱性对水稻籽粒硒含量影响较大。
关键词:  浔郁平原  作物  硒富集特征  pH
DOI:10.13758/j.cnki.tr.2018.06.015
分类号:S184;S314
基金项目:广西科技重大专项(桂科AA17202026)、广西重点研发计划项目(桂科AB16380207)、广西农业重点科技计划项目(201604)、广西富硒特色作物试验站项目(桂TS2016011)、广西农业科学院基本科研业务专项(桂农科2017YZ03)和广西农业科学院科技发展基金项目(2017JM07)资助。
Selenium Accumulation Characteristics and Influential Factors of Different Crops in Xunyu Plain
CHEN Jinping1, LIU Yongxian1, PAN Liping1, WU Tiansheng2, YANG Bin3, XING Ying1, LIAO Qing1, LIANG Panxia1, JIANG Zepu1
1.Agricultural Resources and Environment Research Institute, Guangxi Academy of Agricultural Sciences/Selenium Enriched Agriculture Research Center of Guangxi;2.Geological Survey Institute of Guangxi;3.Leading Group Office for Se-enriched Agricultural Products R&D
Abstract:
Selenium (Se) content in crop is one key factor affecting Se level in food chains. Based on the results of geochemical survey of soil environmental quality regarding crops and long-term positioning observation in Xunyu plain, Se accumulation characteristics of crops and influential factors were studied. Results showed that more than 86% of the rice were rich in Se in Qingtang, Gangnan, Guiping and Pingnan. In the studied area, the proportions of Se-rich peanut, soybean, corn and rice were 100%, 100%, 100% and 89%, respectively. Se bioconcentration factors of the root, stem, and grain of rice were 0.663, 0.130 and 0.108, respectively. Se bioconcentration factor of rice grain was much higher than those of longan, litchi and sugarcane. The correlation coefficient between Se contents in the rice grain and rice rhizosphere soil was 0.660, higher than those of longan and litchi. The correlation coefficient between Se contents in crops and soil pH was 0.342 in Gangnan. Se content in sugarcane stem (0.012 1 mg/kg) was higher in the alkaline soils than in other crops, whereas in the acid soils Se content in rice grain (0.065 3 mg/kg) was the highest among all the crops. These results indicated that the crops with seeds as edible part are generally rich in Se in the Xunyu plain, and Se content in rice is largely affected by soil Se content and pH.
Key words:  Xunyu plain  Crop  Selenium accumulation characteristic  pH

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