钼硒配施对小白菜钼硒形态及硒价态的影响

通过盆栽试验研究钼硒配施对水培小白菜钼硒形态及硒价态的影响。结果表明:施硒增加了小白菜地上部及地下部醇溶态和水溶态钼含量,降低了小白菜地上部及地下部盐溶态及醋酸溶态钼的含量,增加了地下部盐酸溶态钼含量,对地上部盐酸溶态钼含量没有太大的影响。施钼对小白菜地上部醇溶态、水溶态硒含量影响不大,增加了盐溶态及盐酸溶态硒的含量,降低了醋酸溶态硒的含量;施钼对小白菜地下部醇溶态硒含量影响不大,降低了水溶态硒的含量,增加了盐溶态、醋酸溶态及盐酸溶态硒的含量。施用四价的亚硒酸钠对小白菜可食部位硒的有机化较为有利,并且施钼也能促进高硒水平下小白菜体内硒的有机化。因此,钼硒配施虽然对小白菜体内钼和硒的各赋存形态有拮抗作用也有协同作用,但是有利于生产富含有机硒的作物。     

Selenium uptake and fruit quality of pear (Pyrus communis L.) treated with foliar Se application

Consuming selenium (Se)‐rich fruit may play an important role in human health by supplementing Se. The aims of this study were to (1) determine the Se tolerance of pear trees and (2) explore the effects of different Se sources and spraying dates on Se concentrations and transformation of inorganic Se into organic Se compounds in various parts of the pear tree and on fruit quality. Spraying Se(IV) or Se(VI) at a concentration of > 40 mg L^?1 resulted in leaf yellowing, marginal withering, and finally leaf abscission. Furthermore, fruit growth and appearance were adversely affected at high Se doses. At the same application stage, Se concentrations in different parts of the fruit were 1.1–4.7 times higher under Se(VI) compared to Se(IV) treatment. For the same Se source, Se concentrations under treatment at the fruit expanding stage were 1.9–2.5 times higher than under treatment at the fruit‐setting stage. Of the total Se in the fruit, 40% accumulated in the juice under Se(IV) treatment and > 70% under Se(VI) treatment. However, regardless of the Se source, the Se in the juice was almost all inorganic, while the transformation of inorganic Se into organic Se compounds was > 80% and 70% in the peel and pomace, respectively. Foliar Se application somewhat improved fruit quality by increasing the concentration of soluble solids. Compared to other species, Se tolerance in pear trees was relatively low. Given the high accumulation of Se and efficient transformation of inorganic Se into organic Se compounds in the peel, consumption of unpeeled Se‐rich pears is recommended.     

Selenium accumulation in beef: effect of dietary selenium and geographical area of animal origin

Selenium (Se) is an essential nutrient with multiple human health benefits; the single most important dietary source of Se is beef. The Se content of beef varies, and cattle fed a high selenium diet may have Se concentrations in beef that are well above average. Such beef is potentially a unique supplemental source of dietary Se. To examine factors affecting Se accumulation in beef, 16 steers (initial wt 374.4 +/- 33.7 kg) were taken from seleniferous or nonseleniferous areas and fed in a 2 x 2 factorial design with diets high or moderate in Se (11.9 or 0.62 mg Se/kg diet). Diets contained 50% alfalfa, 25% wheat, and 25% corn on a dry matter basis. All dietary Se was from agricultural products, and Se in the high Se diet was primarily from high Se wheat and alfalfa hay. A loin muscle biopsy was taken at the start of the trial to determine initial Se content of beef. Steers were slaughtered after 14 weeks of the trial, and edible carcass (round, sirloin, shoulder clod, and ribeye) and organ samples were collected. Diets did not affect growth or feed intake (P > 0.05), and Se toxicity signs were not observed. Different cuts of meat had similar Se concentrations, and the Se content of all cuts was increased by both high dietary Se and high Se background. Except for liver and kidney, Se in tissues was increased by seleniferous background (P < 0.02) and high dietary Se (P < 0.001). Kidney Se concentrations of animals fed the high Se diet were lowest in animals from seleniferous areas (P = 0.04), suggesting a possible adaptation to the high Se diet. These results demonstrate that cattle fed diets high in Se from agricultural products will accumulate substantial amounts of Se in the beef without developing signs of Se toxicity and that prior Se status regulates Se accumulation in some organs. They further demonstrate that management practices may be altered so as to make beef a significant source of dietary Se.     

影响作物吸收硒的土肥因素研究进展

硒是人体的必需元素,硒缺乏会造成多种疾病。通过摄入农产品适量补充硒,能保证人体健康。对作物补充适量硒肥,是增加农产品硒含量的有效措施。作物吸收硒与土壤因素及肥料因素关系密切,判断哪个因素是影响作物吸收硒最关键的因素值得探讨。通过对文献系统调研发现,影响作物吸收硒的土肥因素中,土壤本身的硒含量及硒肥量最关键,土壤pH及有机质含量为活化土壤硒的间接因素,硒肥种类及施肥方式为配合硒肥量的补充因素。促进作物对硒的吸收要结合土壤性质、硒肥量、施肥方式等因素综合考虑,以达到富硒农产品高产高效的目的。     

Phosphorus application alters concentrations and proportions of organic Se forms in the grain of winter wheat

A deficiency or excess of selenium (Se) can cause disease in the human body, and the dietary intake of organic forms of Se is considered the preferable way to satisfy the Se demand in humans. P application decreases Se uptake and thus also Se concentrations in grains of crops, but little is known about how the P application level may affect the organic forms of Se in the grain of winter wheat. A pot trial with three P levels (0, 80, and 160 mg P kg^?1 soil) and three Se levels (0, 0.5, and 1 mg Se kg^?1 soil) was conducted to investigate the effect of P application on inorganic and organic Se forms, Se bound to protein, polysaccharide, and nucleic acid as well as Se in different protein fractions in the grain of winter wheat. Overall, the concentrations of total Se, and of Se in all analyzed forms, increased with increasing Se application regardless of the rate of P application. In the absence of Se, P application did not have a significant effect on the concentrations of any of the measured Se forms. However, in the presence of Se, increasing P application significantly decreased the concentration of Se of each form. The different rates of P and Se application influenced the proportion of each form of Se in different ways. Increasing levels of P application decreased the concentration of each form of Se in the grain of winter wheat, most likely by a combination of a dilution effect due to enhanced grain yield, and an inhibited Se uptake. Despite an overall decrease in grain Se‐protein, P application might improve the quality of wheat flour by enhancing the accumulation of Se in organic forms such as Se‐nucleic acids and Se‐polysaccharides, as well as the Se in the gliadin and glutenin fractions in the grain.     

外源硒矿粉对玉米硒累积及矿质元素吸收的影响

【目的】通过生物强化的方法获得生物安全形态的有机硒,是实现人体科学补硒的重要途径。研究外源硒矿粉在生产中的合理施用量及其对作物的影响,可为富硒农产品生产提供理论与技术指导。【方法】以玉米为试材,以湖北恩施的富硒矿粉(总硒含量为180 mg/kg)为硒源进行田间试验,研究了玉米对外源硒的吸收与转化及施硒对玉米矿质元素吸收的影响。设5个施硒处理: Se 0 (CK)、 750 (Se1)、 1500 (Se2)、 2250 (Se3) 和3000 g/hm2 (Se4)。于玉米大喇叭口期和成熟期取样,测定玉米不同部位总硒含量以及玉米籽粒中总硒、 有机硒及矿质元素含量。【结果】土壤施用富硒矿粉对玉米籽粒产量和总生物量没有显著影响,但可显著增加玉米籽粒及各器官硒含量。随硒施用量由0增加到3000 g/hm2,玉米籽粒中硒含量由14.2 μg/kg 增加到350.3 μg/kg。除Se2处理外,玉米根系中的硒含量在收获期高于抽穗期,而玉米茎和叶中的硒含量在收获期低于抽穗期。玉米不同器官对硒的富集能力依次为根叶籽粒茎,而玉米对硒的转移系数大小顺序亦为叶籽粒茎。与对照相比,施硒使玉米籽粒中有机硒含量显著增加,不同施硒处理玉米籽粒中有机硒含量范围为12.9~302.6 μg/kg,随土壤施硒量增加,有机硒占总硒的比例从86.87%增加到90.84%,不同处理之间有机硒所占比例差异不显著。玉米籽粒总硒、 有机硒与各器官硒含量之间均表现出显著的相关性,其中籽粒中有机硒与不同生育期根中硒含量达到极显著相关水平。施硒可显著抑制玉米籽粒对Na的吸收,对K、 Ca、 Mg、 Fe 的吸收无显著影响,一定的施硒水平下,可促进玉米籽粒对Mn、 Cu、 Zn的吸收。【结论】施用外源硒矿粉对玉米生物量与籽粒产量无显著影响。随施硒量增加,玉米籽粒中总硒含量和有机硒含量与对照相比显著增加,但对玉米籽粒中的有机硒与总硒的比例没有显著影响。一定施硒水平下,可促进玉米籽粒对Mn、 Cu、 Zn的吸收。以纯硒施用量为750~1500 g/hm2作为硒矿粉在富硒玉米生产中的推荐施硒量。     

春小麦对不同形态Se的吸收和分配

应用~(75)Se 示踪法探讨春小麦对不同形态 Se 的吸收、运转和分配规律。结果表明,春小麦对 Na_2SeO_4[Se(Ⅵ)]的吸收、运转比 Na_2SeO_3[Se(Ⅳ)]快,土施时 Se(Ⅳ)和 Se(Ⅵ)在小麦植株中的分配规律相似,施用方法对 Se 的分配有很大影响。春小麦对 Se(Ⅵ)的利用率比 Se(Ⅳ)高,土施时两者相差8倍,在喷施情况下两者相差2.4倍。施用不同形态的 Se 还影响植株中 Se 的来源。在施 Se(Ⅵ)时,植株中54%～86%的 Se 来自外源 Se,而在施用 Se(Ⅳ)时,则植株中 Se 主要来源于土壤。     

Fate of selenate metabolized by Enterobacter taylorae isolated from rice straw

Rice straw has been successfully tested as an effective organic source and a carrier of selenate [Se(VI)]-reducing bacteria to remove Se(VI) from agricultural drainage water. In this study, an Se(VI)-reducing bacterium identified as Enterobacter taylorae was isolated from rice straw and used to remove Se(VI) from a 0.5% tryptic soy broth (TSB) and high-salt (15.5 dS m(-)(1)) synthetic agricultural drainage water containing Se(VI) in a range of 500-5000 microg/L. Results showed that E. taylorae reduced 81-94% of the added Se(VI) to elemental Se [Se(0)] in the 0.5% TSB solution during a 5-day experiment. In the high-salt drainage water, Se(VI) reduction was rapid during a 9-day experiment. On the final day of the experiment, Se(0) [75%] and Se(-II) [19%] were the major forms of Se in the drainage water with small amounts of Se(VI), Se(IV), and volatile Se released. The pathway of Se(VI) reduction in the drainage water followed the order Se(VI) --> selenite [Se(IV)] --> Se(0) --> selenide [Se(-II)]. This study suggests that E. taylorae may be used to remediate high-salt Se(VI)-contaminated agricultural drainage water.     

磷、硒配施对冬小麦硒吸收及土壤硒形态转化的影响

为研究磷硒配施对冬小麦根土界面硒有效性及形态分级的影响,并探究磷硒配施提高土壤硒有效性的可能机制,以冬小麦为试验材料进行根箱培养试验,设置0(P0)、80(P80)、160 mg·kg^-1(P160)3个磷水平和0(Se0)、1 mg·kg^-1(Se1)2个硒水平,分析冬小麦植株磷硒含量、累积量、迁移系数及根际和非根际土5种硒形态含量。结果表明,无论施硒与否,随着磷含量的增加,冬小麦生物量、地上部和根系磷含量均增大。施硒1 mg·kg^-1显著降低了P80和P160水平下冬小麦生物量、P160水平下根系磷含量及各部位磷累积量。在Se1条件下,施磷增加了各部位硒累积量,但显著降低了地上部硒含量和硒从根系向地上部的迁移系数。在Se0条件下,P160处理增加了根际土壤和非根际土壤中的可交换态硒含量。在Se1条件下,P160处理根际土壤中可交换态硒含量显著高于非根际土壤,但铁锰氧化物结合态硒和残渣态硒含量低于非根际土壤。综上所述,适宜的磷硒配施可影响土壤中各种硒形态的转化过程,可能是由于磷的施入和根系活动共同作用促进了土壤中铁锰氧...     

Se肥施用方式和施用时期对水稻含Se量及产量的影响

在田间小区的试验条件下研究不同硒(Se)肥的施用方法及施用时期对水稻植株和籽粒中Se的吸收与富集的影响。研究表明:水稻在生长前期和旺盛时期对Se的吸收和积累有很大差异。与对照相比,苗床施Se、土壤施Se和叶面喷Se 3种方式均能明显提高各生育期水稻植株和籽粒中Se的含量,富Se效果达到差异极显著水平。从稻米富Se效果看,富Se含量在0.163~0.207 mg·kg-1之间,Se含量增加了5.8~7.6倍,且都在安全范围内。从水稻富Se的方式上,不同施Se方式富Se效果依次为水稻扬花期喷Se土壤施Se育苗期喷Se对照。从叶面喷施Se的时间上,稻米富Se效果依次是扬花期喷Se育苗期喷Se灌浆期喷Se齐穗期喷Se对照。从水稻富Se类型上看,外源无机Se和有机Se都能明显促进水稻对Se的积累。水稻育苗期和扬花期叶面喷Se在提高水稻稻米中含Se量的同时,并没有降低水稻产量。因此水稻叶面喷Se是一条安全、简单、易操作的途径。     

不同供硒水平对水稻硒的吸收和累积特性研究

以"南粳9108"为材料,在巢湖流域研究田间条件下不同供硒水平(Se 0、20、40和60 g/hm~2)以及等量硒肥二次施用对水稻产量和硒吸收、累积、转运及分配的影响。结果表明:一次性施用不同浓度硒肥对水稻有增产作用,但是增产效果甚微;施用硒肥能够显著促进水稻茎、叶和穗的硒含量,但随着时间的推移,茎、叶和穗的含硒量均出现上升再下降趋势;稻谷、糙米及精米中的硒含量与硒肥施用量呈显著正相关,硒肥处理平均硒含量依次为0.279、0.150、0.055 mg/kg,分别较对照不施硒肥高309%、142%和333%;地上部硒累积量与施硒水平呈极显著的正相关,随着施硒量的增加,尽管硒的表观利用率是增加的,但硒转运系数和硒的收获指数显著下降。等量硒肥二次分施较一次性施用对产量有较为显著的促进作用,该处理下水稻产量较对照增加15%;等量硒肥二次施用增加了稻壳和米糠中的硒含量,精米中的硒没有增加;较一次施用,等量硒肥二次施用肥料表观利用率较高,硒肥的收获指数和转运系数显著下降,地上部累积更多的硒在稻草中。综上所述,外源硒的添加确实能增加大米硒含量,使其达到国家富硒大米硒含量标准范围;但结果同时显示水稻中的硒相当大的一部分累积在谷壳、谷糠及稻草中,可考虑充分利用。     

Impact of Wheat Grain Selenium Content Variation on Milling and Bread Baking

Selenium (Se) is an essential micronutrient in animals. High levels of Se can accumulate in wheat grain, but it is not clear how high Se affects milling or baking. Low and high Se grain from the same hard red winter wheat cultivar was milled and used for breadbaking studies and Se analysis. Mill stream yields from the low and high Se wheat were comparable, as were flour yields. The amount of total grain Se retained in the flour mill streams was 71.2 and 66.4% for the low and high Se wheat, respectively. Proportionally, Se content in the bran, shorts, and the first reduction flour stream in high Se wheat was higher by 13–20% compared to the low Se wheat. Flour quality parameters including protein content, ash content, and farinograph traits were similar in low and high Se flours, although high Se flour mill streams exhibited lower farinograph stability. Breadbaking evaluations indicated that high Se had a deleterious effect on loaf volume. There was no evidence of significant Se loss after breadbaking with either low or high Se flour.     

Selenium enrichment of tea from some areas of China

The levels of selenium (Se) in soils and rocks and Se enrichment of tea as well as factors affecting Se extraction rate from tea were studied. The Se content for 133 tea samples varied from 0.021 to 0.774 mg kg^‐1 with a minimum value of 0.017 mg Se kg^‐1 while some other teas had a maximum value of 4.32 mg Se kg^‐1. The Se content of tea was in a logarithmic normal distribution, and its geometric mean value was 0.120 mg Se kg^‐1. The Se content of soil parent materials and rocks were highly correlated with the Se content in tea leaves. Rock stratum rich in Se occurred in Paleozoic siliceaus shales and carbonaceous‐siliceaus shales of the Permian, Ordovician, and Cambrian periods. Total Se extraction rate of tea in three extractions was 25.6% (black tea and green tea were 24.9% and 26.2%, respectively), and the extraction rate for the first, second, and third times were 50.9%, 27.3%, and 21.8% of the total Se extracted, respectively. Based on factors, such as the Se content in tea, daily quantity of tea drunk, Se extraction rate of tea, and the normal Se dietary requirement, we would suggest that the Se index for tea rich in Se is within the range from 0.40 to 1.55 mg Se kg^‐1.     

基于路径分析的土壤性质与硒形态的关系

选择我国15种不同类型土壤,采用连续浸提法测定了土壤中硒的形态,并以Amos18.0路径分析法研究了土壤理化性质对土壤硒形态的影响。结果表明,除江西红壤(水田和旱田)和黑龙江黑土中硒主要是以残渣态存在外,其余土壤中硒主要以有机结合态为主,可溶态硒仅占土壤硒总量的0.4%～14.6%。土壤可交换态及碳酸盐结合态、有机结合态和残渣态硒含量间呈显著正相关(p<0.01),而可溶态和铁锰氧化物结合态硒含量与其他形态硒含量间无显著相关。路径分析表明,土壤有机质含量对铁锰氧化物结合态硒有负影响作用,而对其他四形态硒均为正影响作用。无定形铁含量对可溶态硒含量无影响作用,但对其他四形态硒的正影响作用大于有机质含量的。除可溶态硒外,土壤有机质和无定形铁含量分别对有机结合态和铁锰氧化物结合态硒的影响最大。pH和黏粒分别通过对土壤有机质和无定形铁的负和正作用而影响硒形态。有机质和无定形铁对硒在土壤中的分配起直接决定作用,而pH和黏粒也是不可忽略的影响因素。     

Influence of Selenium on Cadmium Toxicity in Cucumber (Cucumis sativus cv. 4200) at an Early Growth Stage in a Hydroponic System

An experiment was established to assess the ability of selenium (Se) to reduce cadmium (Cd) toxicity when tomato was grown hydroponically. A factorial experiment was arranged in a completely randomized design with six replicates in cucumber (Cucumis sativus cv. 4200). The Se was applied at four levels [0 mg L^–1 (Se0), 2 mg L^–1 Se (Se1), 4 mg L^–1 Se (Se2), and 6 mg L^–1 Se (Se3)], whereas Cd was applied at three levels [0 µM Cd (Cd0), 5 µM Cd (Cd1), and 7 µM Cd (Cd2)]. The Se improved the dry weight of roots even when plants were exposed to Cd. Treatment Se1 improved the dry weight of shoots in Cd1 and Cd2. Treatments Se1 and Se2 improved photosynthesis in Cd1. Treatment Se1 significantly improved stomatal conductance in Cd2 at all levels of Se relative to Cd2. The greatest Cd concentration in leaves was observed in Cd2 × Se0 and while Se concentration in solution increased in response to Se1, Se2, and Se3. The greatest Se level reduced Cd uptake the most. Growth and photosynthetic attributes can be negatively affected by Cd, but Se has the ability to buffer, or improve, several attributes.     

Use of selenium fertilizers for production of Se‐enriched Kenaf (Hibiscus cannabinus): Effect on Se concentration and plant productivity

Due to selenium (Se) deficiency, Se fortification of food and feed is applied in many countries. Therefore, potential use of Se‐enriched kenaf was investigated based on its Se accumulation, its potential to transform accumulated Se to other Se species, and effect of Se accumulation on its growth. Kenaf was grown with different levels of two Se fertilizers (selenite and selenate) at concentrations ranging from 0 to 4 mg Se (kg soil)^–1. Total Se concentrations in the plants grown on selenate‐treated soil amounted to (1019 ± 136) mg Se (kg dry weight)^–1 and were much higher compared to plants grown on selenite‐treated soil. Identified Se species were selenite, selenate, Se‐methionine, and Se‐cystine. Biomass yield, net photosynthesis, and chlorophyll index of the plants decreased when plants were grown on soils treated with high doses of selenate.     

青海东部农田土壤硒分布特征及其影响因素

植物中硒被认为是人体摄入硒的主要来源,而且大多数植物是从土壤中吸收硒。因此,不同地区土壤硒含量的高低直接影响到该地区食物中的硒含量。本研究以青海省平安地区农田土壤为研究对象,用原子荧光光谱法进行了土壤全硒含量和形态及价态的测定,对平安地区农田土壤全硒含量分布特征及其与成土母质、土壤类型的关系进行了研究。结果表明,平安地区土壤全硒含量变化范围为0.089~0.782 mg/kg,平均值为0.418 mg/kg,其中58%的土壤属于富硒土壤范畴。研究区域耕种淡栗钙土全硒含量最高,平均值为0.574 mg/kg;而灌淤黄土全硒含量最低,平均值为0.293 mg/kg。成土母质中,古近–新近系西宁群红色泥岩中硒含量最高,平均值为0.82 mg/kg。平安地区富硒土壤中硒的富集主要来源于古近–新近系西宁群红色泥岩风化。土壤中硒的赋存形态主要以有机结合态为主,铁锰氧化物结合态硒含量最少。可溶态硒和可交换态及碳酸盐结合态硒均以六价硒为主要赋存价态。平安地区富硒土壤中硒含量适宜,供硒潜力较大,且该地区受外界环境污染较少,具有良好的开发利用前景。     

两个水稻品种富硒特性比较研究

以前期田间试验筛选出的富硒能力较强的水稻品种捷丰优629和谷丰优8312为材料,采集硒含量不同的稻田土壤,通过盆栽试验进一步研究了两个水稻品种对土壤硒的吸收、分配及其糙米和精米中无机硒与有机硒含量的组成特点。结果表明:两个水稻品种植株的硒累积量、糙米和精米的硒含量与有机硒含量都是高硒土壤极显著高于低硒土壤,表明高硒土壤有利于稻米硒的累积与有机硒的合成,因此生产优质富硒大米最好选择硒含量较高的稻田土壤。无论在高硒土壤还是低硒土壤上,捷丰优629植株中硒累积量和籽粒中硒累积量与谷丰优8312的差异都不显著,但捷丰优629的糙米和精米中硒含量以及有机硒含量都极显著高于谷丰优8312,表明捷丰优629吸收的硒易分配到可食用部位(糙米和精米),而且其无机硒向有机硒的转化能力较强,因此综合比较来看捷丰优629富硒特性优于谷丰优8312。     

Selenium treatment alters the effects of UV radiation on chemical and production parameters in hybrid buckwheat

Ambient UV radiation is recognised as an important environmental factor in the regulation of plant growth and development, and selenium (Se) as a beneficial nutrient that can increase plant tolerance to different environmental constraints. The effects on hybrid buckwheat plants of full (+UV) and reduced (?UV) ambient UV radiation without (?Se) and with (+Se) foliar Se treatment (10?mg?L^?1 sodium selenate) provided the four conditions of Se?UV–, Se–+UV, +Se?UV and +Se+UV. Plant morphological, biochemical and physiological properties were examined, along with leaf elemental composition and content, efficiency of Se enrichment, and production parameters. Leaf anatomical parameters under all conditions were mainly affected by UV radiation, and less so by Se. +Se+UV plants showed a trade-off between primary and secondary metabolism, which resulted in high levels of protective substances (e.g. anthocyanins, UV absorbing compounds), and low levels of photosynthetic pigments. All +UV plants were significantly shorter in comparison to those under the reduced ?UV, while biomass production was highest for ?Se+UV plants and lowest for +Se+UV plants. +Se plants accumulated ～20-fold greater Se content compared to ?Se plants, and full ambient UV radiation partly reduced this effect. +UV plants showed increased phosphorus content in leaves, independent of Se status, while +Se plants showed increased K content. Si content was increased by Se treatment and decreased by the full UV exposure. Se treatment and the ambient UV radiation, separately have positive effects on growth and production of this hybrid buckwheat, while the combination of the Se treatment and ambient UV resulted in lower yields. However, under these conditions (+Se+UV), the buckwheat plants established good protection against the different environmental constraints that are becoming more and more frequent due to changes to our climate.     

水稻不同生育期对硒的吸收、转运及累积规律

采用大田试验,研究土壤施用含硒肥料后水稻中硒的积累和分布的动态变化。结果表明:在水稻不同器官中硒的积累量与含硒肥料施用量呈正相关,相关系数达到0.98以上。水稻成熟期,硒施用量30 kg/hm2和120 kg/hm2处理全株硒浓度分别比对照处理提高了98.9%和313.7%。不同生育期,水稻各个器官中硒含量及累积量不同,水稻硒的生物富集高峰期表现在孕穗期,叶与水稻穗部吸收累积硒有着密切关系。水稻成熟期整个植株中硒的累积量为茎叶精米根颖壳。在整个水稻生育期硒有一定的运转累积规律:水稻分蘖期时,硒从根、茎流向叶片;孕穗期再由叶流向茎;灌浆期又从根运转到叶和穗中;最后成熟期叶中的硒流向穗。苗期施用含硒肥料是一条提高水稻硒含量的有效农艺措施。