發(fā)布時(shí)間：2018-03-08 19:15

  本文選題：有效鋅　切入點(diǎn)：全鹽　出處：《甘肅農(nóng)業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：本文以河西綠洲灌區(qū)鹽漬化耕地土壤為研究對象,對土壤的鹽漬化特征及其與土壤有效鋅含量的關(guān)系進(jìn)行了調(diào)查研究,為揭示河西綠洲灌區(qū)鹽漬化環(huán)境對土壤有效鋅影響機(jī)理提供了可靠的參考。通過對研究區(qū)內(nèi)農(nóng)田的鹽漬化環(huán)境因子含量及有效鋅含量的測定,對鹽漬化環(huán)境因子(鹽分含量、p H值、鹽分離子組成)與有效鋅間的相關(guān)關(guān)系進(jìn)行統(tǒng)計(jì)分析,得出如下結(jié)論。(1)研究區(qū)各層土壤均呈鹽化狀態(tài),剖面土壤鹽分具有明顯的表聚特征,呈“T”型分布。剖面中的陽離子以Ca2+為主,離子含量最高,占各土層陽離子總量的31.28%~48.09%,其次是Na+,占25.11%~35.18%;陰離子以SO42-為主,占各土層陰離子總量的70%以上,其次是HCO3-,占7.60%~20.00%。各層土壤p H的平均值介于8.55~8.63之間。(2)研究區(qū)土壤中的有效鋅含量介于0.289~0.736mg.kg-1之間,平均為0.473mg.kg-1,低于土壤缺鋅臨界值(0.5 mg.kg-1),變異系數(shù)為18.67%。該區(qū)鹽漬化土壤的有效鋅含量總體較低。從不同類型鹽堿地土壤有效鋅的含量來看,鹽化潮土最高,黑堿土次之,鎂質(zhì)鹽漬土最低;從不同鹽漬化程度土壤有效鋅含量來看,輕質(zhì)鹽漬土最高,中度鹽漬土次之,重度鹽漬土最低。(3)典范對應(yīng)分析結(jié)果表明,K+與Mg2+、Ca2+與SO42-在各土層內(nèi)始終有較好的關(guān)聯(lián)性;Na+與Cl-在0~20cm和40~100cm土層的關(guān)聯(lián)性較好,SO42-與Na+正好與其相反,在20~40cm土層的關(guān)聯(lián)性較好;K+與Na+在40~80cm土層的關(guān)聯(lián)性較好。在0~100 cm全剖面上,土壤p H的空間分布受HCO3-和Na+含量的影響較大,土壤含鹽量受SO42-、Cl-和Ca2+含量的影響較大,是影響河西綠洲灌區(qū)鹽堿地類型和分布的主要因素。(4)各土層的影響因素與全剖面有所不同,0~20 cm土層內(nèi)土壤含鹽量和p H的空間分布主要受控于SO42-含量,20~40 cm土層內(nèi)受Cl-、Na+-、Ca2+和SO42-共同影響,40~60cm和60~80cm土層內(nèi)K+是主要影響因素,80~100 cm土層內(nèi)主要受控于K+和Mg2+含量。(5)該區(qū)鹽漬化土壤的有效鋅含量總體較低。從不同類型鹽堿地土壤有效鋅的含量來看,鹽化潮土最高,黑堿土次之,鎂質(zhì)鹽漬土最低;從不同鹽漬化程度土壤有效鋅含量來看,輕質(zhì)鹽漬土最高,中度鹽漬土次之,重度鹽漬土最低。(6)全鹽含量的高低不是影響土壤有效鋅含量的決定因素。p H值與有效鋅含量之間呈現(xiàn)出了極顯著的負(fù)相關(guān)關(guān)系,但是負(fù)相關(guān)關(guān)系的變異性較大。鹽分離子中HCO3-和Mg2+與有效鋅含量呈現(xiàn)出了極顯著的負(fù)相關(guān)關(guān)系;其他離子在回歸分析過程中擬合程度并不好,沒有較顯著的相關(guān)關(guān)系。
[Abstract]:In this paper, the salinization characteristics of soil and the relationship between soil salinization and available zinc content in Hexi oasis irrigated area were investigated. In order to reveal the influence mechanism of salinized environment on soil available zinc in Hexi oasis irrigation area, the contents of salinized environmental factors and available zinc in farmland were determined. The correlation between salinization environmental factors (salt content, pH value, salt ion composition) and available zinc was statistically analyzed. In the profile, Ca2 is the main cations, and the ion content is the highest, accounting for 31.288.09% of the total cations in each soil layer, followed by Na (25.11% 35.18%), and so 42- is the main anion in the profile. Accounting for more than 70% of the total anions in each soil layer, followed by HCO _ 3, which accounted for 7.60,20.00.The average value of soil pH in each layer was between 8.55 and 8.63, and the available zinc content in the soil was between 0.289 and 0.736 mg 路kg ~ (-1). The average value was 0.473 mg 路kg ~ (-1), which was lower than the critical value of soil zinc deficiency (0.5 mg 路kg ~ (-1)), and the coefficient of variation was 18.67. The available zinc content of salinized soil in this area was relatively low. According to the content of available zinc in different types of saline-alkali soil, salinized tidal soil was the highest, and black alkali soil was the second. According to the soil available zinc content of different salinization degree, the light saline soil is the highest, the moderate salinized soil is the second. The results of canonical correspondence analysis showed that the correlation between K and Mg2 Ca 2 and so 42- was always good in each soil layer. The correlation between Na and Cl- was better in 0 ~ 20 cm and 40 ~ 100 cm soil layer, so _ 42- and Na were just the opposite. The correlation between K and Na was better in the soil layer of 20 ~ 40cm than that in the soil layer of 40 ~ 80cm. The spatial distribution of soil pH was greatly affected by the contents of HCO3- and Na, and the salinity of soil was influenced by the contents of SO42-Cl- and Ca2. It is the main factor that affects the type and distribution of saline-alkali land in Hexi oasis irrigation area.) the influencing factors and the whole profile of each soil layer are different. The spatial distribution of soil salinity and pH in 20cm soil layer is mainly controlled by so _ 4 _ 2-content ~ (20) ~ (40 cm) soil layer. K in the soil layer of 40cm and 80cm is the main factor controlled by K and Mg2 contents in 100cm soil layer.) the available zinc content of salinized soil in this area is generally lower. The available zinc content of soil in different types of saline and alkali soils is lower than that in the soil layer of different types of saline-alkali soil. The salinized tidal soil was the highest, the black alkali soil was the second, the magnesia saline soil was the lowest, and the light salinized soil was the highest, the moderate saline soil was the second, according to the soil available zinc content of different salinization degree, There was a significant negative correlation between total salt content and available zinc content, which was not the determinant factor of soil available zinc content. However, there was a significant negative correlation between HCO3- and Mg2 in salt ions and the content of available zinc, while the other ions did not fit well in regression analysis, and there was no significant correlation between HCO3- and Mg2 in the process of regression analysis.
【學(xué)位授予單位】：甘肅農(nóng)業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：S156.41

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 蒲玉琳;龍高飛;劉世全;陳紅君;;西藏土壤有鋅含量及其影響因子分析[J];安徽農(nóng)業(yè)科學(xué);2009年30期

2 丁疆華,溫琰茂,舒強(qiáng);土壤環(huán)境中鎘、鋅形態(tài)轉(zhuǎn)化的探討[J];城市環(huán)境與城市生態(tài);2001年02期

3 趙同科;植物鋅營養(yǎng)研究綜述與展望[J];河北農(nóng)業(yè)大學(xué)學(xué)報(bào);1996年01期

4 王佳麗;黃賢金;鐘太洋;陳志剛;;鹽堿地可持續(xù)利用研究綜述[J];地理學(xué)報(bào);2011年05期

5 靳孟貴,劉延鋒,董新光,周金龍;節(jié)水灌溉與農(nóng)業(yè)面源污染控制研究——以新疆焉耆盆地為例[J];地質(zhì)科技情報(bào);2002年01期

6 曾昭華;長江中下游地區(qū)地下水中化學(xué)元素的背景特征及形成[J];地質(zhì)學(xué)報(bào);1996年03期

7 姜凌;李佩成;胡安焱;易秀;;干旱區(qū)綠洲土壤鹽漬化分析評價(jià)[J];干旱區(qū)地理;2009年02期

8 樊自立,馬英杰,馬映軍;中國西部地區(qū)的鹽漬土及其改良利用[J];干旱區(qū)研究;2001年03期

9 李朝剛,楊虎德,胡關(guān)銀,王淑榮;干旱高揚(yáng)黃灌區(qū)鹽堿地恢復(fù)治理[J];干旱區(qū)研究;1999年01期

10 甄清香，劉世鐸，馬金占，邵煜庭;甘肅主要農(nóng)業(yè)土壤磷、鋅關(guān)系的研究[J];甘肅農(nóng)業(yè)大學(xué)學(xué)報(bào);1995年04期

，

本文編號：1585193