本文選題：土壤粒級(jí) + 土壤鉛含量　； 參考：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：茶葉是我國和全球范圍內(nèi)的重要飲料,茶葉鉛超標(biāo)曾經(jīng)是社會(huì)關(guān)注的熱點(diǎn)問題。大量研究表明,茶葉中鉛的主要來源是土壤,土壤鉛含量是決定茶葉鉛含量的主導(dǎo)因素;土壤中重金屬元素存在形態(tài)是決定其生物有效性和生態(tài)效應(yīng)的關(guān)鍵,土壤鉛存在形態(tài)及其有效量與茶葉鉛含量關(guān)系是近年來的研究熱點(diǎn)。本文以福建安溪鐵觀音茶葉主產(chǎn)區(qū)為研究區(qū),采樣測定了56個(gè)茶園表土、亞表土、茶葉中鉛等元素含量,選取典型表土、亞表土樣品各27件,超聲振動(dòng)篩分成5個(gè)粒級(jí),進(jìn)一步研究了土壤鉛粒級(jí)分配規(guī)律及4種提取態(tài)含量。研究表明,福建安溪地區(qū)土壤鉛平均含量約為我國土壤鉛背景值的二倍,表層和亞表層中土壤鉛含量變化不大。土壤鉛的粒級(jí)分布不均勻,具有在土壤細(xì)粒級(jí)中富集的特征。4種方法提取結(jié)果表明,表層土壤鉛提取量大小順序?yàn)?絡(luò)合劑提取酸提取鹽提取水提取,亞表層土壤鉛提取量大小順序?yàn)?酸提取絡(luò)合劑提取鹽提取水提取,絡(luò)合劑提取和酸提取的有效態(tài)鉛含量相近并遠(yuǎn)大于鹽提取和水提取的有效態(tài)鉛含量。除了水提取態(tài)鉛外,鹽提取、酸提取、絡(luò)合劑鉛提取量均隨土壤粒級(jí)的減小而增加。土壤全量鉛與茶葉鉛含量呈正相關(guān)關(guān)系,據(jù)此可建立茶葉—土壤鉛含量關(guān)系模型。茶葉鉛含量與土壤有效態(tài)鉛含量的相關(guān)性明顯高于與土壤全量鉛的相關(guān)性,因此土壤有效態(tài)鉛含量更能反映土壤鉛的生態(tài)風(fēng)險(xiǎn),對(duì)比表明0.1mol/L稀鹽酸和混合絡(luò)合物溶液(0.02mol/L EDTA+0.5mol/L HOAc+0.5mol/L NH4OAc)提取效果最好。建立了茶葉鉛含量與土壤理化指標(biāo)的多元線性回歸方程,結(jié)果表明p H值、粘粒組分、Corg、CEC等土壤理化對(duì)于茶葉鉛含量有一定的影響,但是影響程度較低,土壤鉛含量是茶葉鉛含量的主導(dǎo)和決定因素。本項(xiàng)研究成果為安溪茶園土壤鉛生物有效性評(píng)價(jià)方法的建立、土壤鉛污染對(duì)茶葉安全質(zhì)量的評(píng)價(jià)預(yù)測提供了重要依據(jù)。
[Abstract]:Tea is an important beverage in our country and the whole world. A large number of studies have shown that the main source of lead in tea is soil, and the lead content in soil is the leading factor to determine the content of lead in tea, and the form of heavy metal elements in soil is the key to determine its biological availability and ecological effect. The relationship between the forms of lead in soil and the content of lead in tea has been a hot research topic in recent years. In this paper, the contents of lead in 56 tea garden topsoil, subsurface soil and tea were determined in the main tea production area of Anxi Tieguanyin Tea, Fujian Province. The typical topsoil, 27 subsurface soil samples were selected, and the ultrasonic vibrating screen was divided into 5 grain levels. The distribution law of lead particles and the contents of four kinds of extractable species in soil were further studied. The results show that the average content of soil lead in Anxi area of Fujian Province is about twice as high as the background value of soil lead in China. The content of lead in topsoil and subsurface layer does not change much. The grain-size distribution of lead in soil was uneven, and the extraction results showed that the extraction amount of lead in surface soil was in the order of complexing agent extraction, acid salt extraction and water extraction. The order of the amount of lead extraction in subsurface soil was as follows: acid extraction complex agent extraction salt extraction water extraction, the effective lead content of complex agent extraction and acid extraction were similar and much larger than the available lead content of salt extraction and water extraction. Except water extraction, salt extraction, acid extraction and complexing agent lead extraction increased with the decrease of soil particle size. There was a positive correlation between total lead content in soil and lead content in tea, based on which a model of tea-soil lead content relationship could be established. The correlation between tea lead content and soil available lead content was significantly higher than that with total soil lead content, so the soil available lead content could reflect the ecological risk of soil lead. The comparison shows that the extraction efficiency of 0.1mol/L dilute hydrochloric acid and mixed complex solution is 0.02mol / L EDTA 0.5mol/L HOAc 0.5mol/L NH4OAc. The multivariate linear regression equation between tea lead content and soil physical and chemical index was established. The results showed that soil physicochemical properties such as pH value, clay component Corgfen CEC had some influence on tea lead content, but the influence degree was low. Lead content in soil is the leading and decisive factor of lead content in tea. The results of this study provide an important basis for the establishment of biological evaluation method of soil lead in Anxi tea garden and the evaluation and prediction of tea safety quality by soil lead pollution.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X53

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 石元值;金李孟;祝幼松;;第一講：茶葉重金屬元素含量現(xiàn)狀及累積特點(diǎn)[J];中國茶葉;2007年06期

2 湯茶琴,曾曉維,陸建良,梁月榮;茶葉中的鉛及其安全性檢測[J];茶葉;2003年01期

3 劉順民;;福建沿海地區(qū)表層土壤鉛來源及分布特征[J];福建地質(zhì);2010年03期

4 張炳鈴;;安溪縣茶園土壤養(yǎng)分特性評(píng)價(jià)[J];福建農(nóng)業(yè)科技;2012年07期

5 魏復(fù)盛,陳靜生,吳燕玉,鄭春江;中國土壤環(huán)境背景值研究[J];環(huán)境科學(xué);1991年04期

6 孫花;譚長銀;黃道友;萬大娟;劉利科;楊燕;余霞;;土壤有機(jī)質(zhì)對(duì)土壤重金屬積累、有效性及形態(tài)的影響[J];湖南師范大學(xué)自然科學(xué)學(xué)報(bào);2011年04期

7 竇爭霞;土壤鉛污染及其對(duì)植物的影響[J];農(nóng)業(yè)環(huán)境科學(xué)學(xué)報(bào);1988年03期

8 何峰,涂從,苗金燕;土壤鉛有效態(tài)臨界含量的研究[J];農(nóng)業(yè)環(huán)境科學(xué)學(xué)報(bào);1992年02期

9 戴禮洪;周莉;閆立金;;土壤作物系統(tǒng)重金屬污染研究[J];農(nóng)業(yè)環(huán)境與發(fā)展;2007年06期

10 周國華,朱立新,喻勁松,王徽,馬生明;贛南茶區(qū)生態(tài)地球化學(xué)環(huán)境[J];物探與化探;2001年04期

，

本文編號(hào)：1948913