本文關(guān)鍵詞：酸雨區(qū)不同用地類型土壤有效態(tài)Cd含量季節(jié)變化及關(guān)鍵影響因子　出處：《環(huán)境科學(xué)》2017年09期 　論文類型：期刊論文

  更多相關(guān)文章： 酸雨區(qū) Cd污染 有效態(tài)Cd 季節(jié)變化 關(guān)鍵影響因子

【摘要】：探明污染土壤重金屬有效態(tài)含量的季節(jié)變化特征及其敏感影響因子,對(duì)農(nóng)業(yè)生產(chǎn)過程中減低重金屬生態(tài)風(fēng)險(xiǎn)具有重要的參考價(jià)值.研究于湘江中下游典型Cd超標(biāo)農(nóng)業(yè)小流域中選取稻田、旱作蔬菜地、丘陵林地這3類主要用地類型,分析不同用地類型Cd活性的季節(jié)變化特征及其與土壤基本理化參數(shù)的關(guān)聯(lián).為期1 a的原位監(jiān)測(cè)結(jié)果顯示,研究區(qū)為典型酸雨區(qū),雨水p H值呈現(xiàn)冬、春季節(jié)低于夏、秋季.稻田土壤總Cd含量顯著高于旱作蔬菜地,菜地顯著高于林地,3種用地類型土壤總Cd含量季節(jié)特征相似,均為夏秋季節(jié)略低于冬春兩季.3種用地類型Cd有效態(tài)季節(jié)變化與總Cd含量無明顯的相關(guān)性,稻田土壤有效態(tài)Cd含量在5~9月的作物生長(zhǎng)季明顯低于其他月份,而菜地和林地則恰好相反.稻田土壤Cd有效性的最關(guān)鍵影響因子為Eh,呈顯著正相關(guān),與土壤p H負(fù)相關(guān),菜地土壤與土壤TOC明顯負(fù)相關(guān),而林地土壤Cd有效性與水溶性有機(jī)碳、TOC呈現(xiàn)明顯的正相關(guān)關(guān)系.研究可為Cd超標(biāo)土壤污染阻控與農(nóng)業(yè)安全生產(chǎn)提供一定的數(shù)據(jù)參考.
[Abstract]:The seasonal variation characteristics and sensitive factors of the available heavy metal contents in contaminated soils were investigated. It has an important reference value for reducing the ecological risk of heavy metals in the agricultural production process. The selection of paddy field and dry vegetable land in the typical CD exceeding standard agricultural small watershed in the middle and lower reaches of Xiangjiang River were studied. The seasonal variation characteristics of CD activity of different land types and their correlation with soil physical and chemical parameters were analyzed. The study area is typical acid rain area, Rain Water pH value is winter, spring season is lower than summer, autumn. The total CD content of paddy soil is significantly higher than that of dry vegetable land, vegetable land is significantly higher than forest land. The seasonal characteristics of total CD content in the three land use types were similar, and there was no significant correlation between the seasonal variation of CD available state and the total CD content in summer and autumn seasons, which was slightly lower than that in winter and spring. 3. The available CD content in paddy soil was significantly lower than that in other growing seasons from 5 to September, while that in vegetable land and woodland was opposite. The most important factor affecting CD availability in paddy soil was Eh. There was a significant positive correlation between CD availability and soil pH, a negative correlation between vegetable soil and soil TOC, and a significant correlation between CD availability and water-soluble organic carbon. The study can provide some data reference for the prevention and control of CD excess soil pollution and agricultural safety production.
【作者單位】： 湖南農(nóng)業(yè)大學(xué)資源環(huán)境學(xué)院;中國科學(xué)院亞熱帶農(nóng)業(yè)生態(tài)研究所亞熱帶農(nóng)業(yè)生態(tài)過程重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金項(xiàng)目(51409101) 湖南農(nóng)田重金屬污染來源及灌溉水處理研究與示范項(xiàng)目(湘財(cái)農(nóng)指[2016]130號(hào))
【分類號(hào)】：X517;X53
【正文快照】： 長(zhǎng)沙410125)土壤重金屬超標(biāo)已成為當(dāng)代社會(huì)最為關(guān)注的全球性環(huán)境污染問題之一[1,2],我國近2×107hm2農(nóng)田存在不同程度的重金屬超標(biāo)問題,其中以西南地區(qū)的重金屬超標(biāo)問題尤為嚴(yán)重[1,3,4].湖南是我國著名的有色金屬之鄉(xiāng),多數(shù)有色以及稀有金屬礦產(chǎn)的采冶均集中分布在湘江流域內(nèi),

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