本文關(guān)鍵詞：巴中主要農(nóng)產(chǎn)品及其產(chǎn)地土壤生態(tài)地球化學(xué)特征研究　出處：《成都理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 土壤 生態(tài)地球化學(xué)特征 種植區(qū)劃 巴中市

【摘要】：土壤是人類賴以生存、發(fā)展的物質(zhì)基礎(chǔ),然而,隨著城市化、工業(yè)化進(jìn)程的加快,人口的日益增加,可利用的土壤資源日益減少,人地矛盾更加突出。本論文運(yùn)用地球化學(xué)方法,在川東北巴中市巴州區(qū)、南江縣、平昌縣、通江縣展開土壤調(diào)查,共采集到表層土壤344件,剖面土壤39件,作物樣品49件,查明該地區(qū)不同土壤類型、不同土地利用類型、不同耕作制度類型、不同縣區(qū)的元素含量特征,篩選出富硒、富碘、富鋅作物,并運(yùn)用比較指數(shù)法、單因子評價(jià)法、尼梅羅綜合評價(jià)法、地質(zhì)累積指數(shù)法、人類活動(dòng)環(huán)境系數(shù)法對該區(qū)土壤質(zhì)量進(jìn)行評價(jià),并最終對種植區(qū)進(jìn)行區(qū)劃。主要評價(jià)成果如下:(1)①不同土壤類型中元素含量特征。Se元素含量:黃棕壤水稻土黃壤紫色土;I元素含量:黃棕壤水稻土黃壤紫色土;S元素含量:水稻土紫色土黃棕壤黃壤;Zn元素含量:紫色土水稻土黃棕壤黃壤;Pb元素含量:紫色土黃棕壤黃壤水稻土;Cd元素含量:黃棕壤紫色土黃壤水稻土。②不同土地利用類型中元素含量特征。Se元素含量:茶園地其他園地蔬菜地林地農(nóng)田果園地;I元素含量:茶園地林地其他園地果園地蔬菜地農(nóng)田;S元素含量:蔬菜地林地其他園地農(nóng)田茶園地果園地;Zn元素含量:果園地蔬菜地林地茶園地農(nóng)田其他園地;Pb元素含量:果園地其他園地茶園地蔬菜地林地農(nóng)田;Cd元素含量:其他園地蔬菜地茶園地=農(nóng)田林地果園地。③不同耕作制度類型中元素含量特征。Se元素含量:水耕地旱作地水旱地;I元素含量:水耕地旱作地水旱地;S元素含量:水耕地水旱地旱作地;Zn元素含量:旱作地水耕地水旱地;Pb元素含量:水旱地旱作地水耕地;Cd元素含量:水旱地旱作地水耕地。④不同縣區(qū)元素含量特征。Se元素含量:南江縣通江縣巴州區(qū)平昌縣;I元素含量:南江縣巴州區(qū)通江縣平昌縣;S元素含量:南江縣巴州區(qū)通江縣平昌縣。Zn元素含量:南江縣巴州區(qū)通江縣平昌縣;Pb元素含量:南江縣平昌縣巴州區(qū)通江縣;Cd元素含量:巴州區(qū)=通江縣平昌縣=南江縣。(2)作物樣品中富Se作物為:巴州區(qū)恩陽鎮(zhèn)明揚(yáng)村采樣的玉米、水稻,南江縣下兩鎮(zhèn)元頂子村采樣的茶葉,南江縣長赤鎮(zhèn)建華村采樣的水稻,平昌縣雙鹿鄉(xiāng)大鹿村采樣的水稻、玉米;富I作物為巴州區(qū)恩陽鎮(zhèn)明揚(yáng)村采樣的玉米;富Zn作物為:巴州區(qū)恩陽鎮(zhèn)明揚(yáng)村采樣的玉米;平昌縣雙鹿鄉(xiāng)大鹿村采樣的玉米。(3)Se、I、S、Zn元素與全國背景值的比較指數(shù)為-6,有益元素含量中的Se、I、S元素低于全國水平。4個(gè)富硒區(qū)域?yàn)?南江縣的下兩鎮(zhèn)、趕場鎮(zhèn)、流壩鄉(xiāng),通江縣的空山鄉(xiāng)。344件土壤樣品中,I元素高于全國平均含量的有3個(gè),分布在:南江縣下兩鎮(zhèn)元頂子村、南江縣流壩鄉(xiāng)金臺村、通江縣兩河口鄉(xiāng)木偌槽村。S元素最小值為63.2μg/g,巴中市表層土壤S元素含量豐富。344件土壤樣品中,Zn元素高于全國平均值的樣點(diǎn)為25個(gè),分布在:巴州區(qū)的水寧寺、茶壩、玉堂;南江縣的元潭、東榆、下兩、長赤、寨坡、上兩、關(guān)壩、石潭、流壩;平昌縣的蘭草、六門;通江縣的諾江、三合。(4)表層土壤中Pb、Cd元素與全國背景值的比較指數(shù)為0,基本全國水平持平。表層土壤中Pb元素均符合國家一級、二級、三級土壤標(biāo)準(zhǔn);Cd元素符合國家二級土壤標(biāo)準(zhǔn),未符合國家一級土壤標(biāo)準(zhǔn),但Cd元素剖面土樣含量符合國家一級土壤標(biāo)準(zhǔn)。Pb元素尼梅羅綜合污染指數(shù)為1.24,為輕度污染,Cd綜合污染指數(shù)為2.99,為中度污染。Pb元素的地質(zhì)累積指數(shù)為0.625,為輕污染;Cd元素的地質(zhì)累積指數(shù)為1.869,為中度污染。人為活動(dòng)環(huán)境富集系數(shù)顯示:研究區(qū)Cd元素受人為活動(dòng)影響較Pb元素大。(5)研究區(qū)劃分為4個(gè)種植帶:通江縣空山鎮(zhèn)富硒、富碘、富硫馬鈴薯種植帶,南江縣下兩鎮(zhèn)富硒、富碘、富鋅茶葉種植帶,南江縣留壩鄉(xiāng)富硒、富碘、富硫、富鋅蔬菜種植帶,南江縣長赤鎮(zhèn)富碘、富鋅糧食種植帶。
[Abstract]:The soil is the material basis for human survival and development, however, along with the city, industrialization, population increasing, soil available resources reducing increasingly, the contradiction between people and land more prominent. This paper uses geochemical methods, in Bazhou District, Bazhong City, Northeast Sichuan Nanjiang County, Pingchang County, soil survey Tongjiang County, we collected 344 surface soil, soil 39, crop samples 49, identify the different soil types in the area of different land use types, different types of farming system, the amount of features with different counties selected element, selenium, iodine, zinc rich crops, and compared with single index method. The comprehensive evaluation factor evaluation method, Nemero method, geological accumulation index method, evaluation of soil quality in the area of human activity environment coefficient method, and finally to partition the planting area. The main results are as follows: (1) different soil types The content of the element content of.Se element type: yellow brown paddy soil yellow purple soil; the content of I in yellow brown paddy soil and yellow soil, purple soil; S content: purple brown yellow brown paddy soil; Zn content: purple soil rice brown brown yellow soil; Pb content: purple color yellowish brown yellow Brown paddy soil; Cd content: yellow brown purple soil yellow paddy soil..Se content of the element content of different land use types in the orchard vegetable garden other woodland farm tea; I content: Tea Garden orchard woodland other vegetable fields farmland; S content: vegetable garden tea garden to other forest farmland fruit garden; Zn content: Vegetable orchard woodland garden farmland other garden; Pb content: Orchard garden tea garden vegetables to other forest farmland; the content of Cd: the vegetable garden tea garden = agricultural he Tianlin orchard. Content of the element content of.Se element type in different tillage system: hydroponic drought to flood and drought; I content: hydroponic and drought to flood and drought; S content: to flood and drought in hydroponics; Zn content: upland hydroponic water dry; Pb content: flood and drought dry land water land; Cd content: flood and drought water dry farmland. The different counties characteristic of element content of.Se element content: Bazhou Nanjiang County Tongjiang County Pingchang County; I content: Bazhou District Nanjiang County Tongjiang County Pingchang County; S content: Bazhou Nanjiang County Tongjiang County Pingchang County.Zn content: Bazhou Nanjiang County Tongjiang County Pingchang County; Pb content: Bazhou District Nanjiang County Pingchang County Tongjiang County; Cd content: Bazhou Pingchang County Tongjiang County District Nanjiang county. = = (2) crop samples of Se rich crops: sampling Ming Yang Village Bazhou District Enyang town of corn, water 紼，

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