本文選題：水稻土　切入點：鎘形態(tài)　出處：《西南農(nóng)業(yè)學(xué)報》2017年02期 　論文類型：期刊論文

【摘要】：作物籽粒中鎘來源于土壤,土壤中鎘形態(tài)的含量與作物吸收量密切相關(guān)。本文旨在找出作物籽粒中鎘與土壤鎘形態(tài)之間的相關(guān)性,探究小麥/水稻籽粒中鎘的來源,為阻斷鎘吸收提供理論依據(jù)。采用調(diào)查采樣方法,對成都平原鎘污染區(qū)沖積性水稻土耕作層土壤鎘形態(tài)及對應(yīng)的作物秸稈和籽粒鎘含量進行了測試分析,研究鎘超標水稻土不同形態(tài)鎘的分布特征及其生物效應(yīng)。結(jié)果表明:水稻土不同形態(tài)鎘的平均含量高低排序為:鐵錳氧化物結(jié)合態(tài)殘留態(tài)水溶交換態(tài)有機質(zhì)結(jié)合態(tài)碳酸鹽結(jié)合態(tài),各形態(tài)分布極不均衡,生物可利用形態(tài)所占比例較大。鐵錳氧化物結(jié)合態(tài)鎘與土壤pH值呈極顯著正相關(guān)(r=0.712**,P0.01)。小麥、水稻籽粒與秸稈中鎘含量均呈極顯著正相關(guān),相關(guān)系數(shù)分別為0.854**(P0.01)和0.872**(P0.01)。小麥秸稈和籽粒中鎘含量與土壤中水溶交換態(tài)鎘呈極顯著正相關(guān)(r=0.677**和0.867**,P0.01),與其他形態(tài)相關(guān)性不顯著;水稻籽粒中鎘含量僅與土壤中水溶態(tài)鎘含量呈顯著正相關(guān)(r=0.573*,P0.05),與其他形態(tài)相關(guān)性不顯著。鎘污染區(qū)水稻土種植水稻和小麥農(nóng)產(chǎn)品的鎘含量超標風(fēng)險較大。
[Abstract]:Cadmium in crop grains is derived from soil, and the content of cadmium forms in soil is closely related to crop uptake. The purpose of this paper is to find out the correlation between cadmium forms in crop grains and soil cadmium forms, and to explore the sources of cadmium in wheat / rice grains. In order to provide theoretical basis for blocking cadmium absorption, the cadmium morphology of cultivated layer of alluvial paddy soil and the cadmium content of crop straw and grain in CD contaminated area of Chengdu Plain were measured and analyzed by the method of investigation and sampling. The distribution characteristics and biological effects of cadmium in different forms of paddy soil were studied. The results showed that the average content of cadmium in different forms of paddy soil was in the order of iron and manganese oxide bound residual water-soluble exchangeable organic matter binding. Carbonate bound state, The distribution of various forms was very uneven, and the proportion of bioavailable forms was large. There was a very significant positive correlation between Fe and mn oxide bound cadmium and soil pH value, and there was a very significant positive correlation between CD content in wheat, rice grain and straw. The correlation coefficients were 0.854 (P 0.01) and 0.872 (P 0.01), respectively. There was a very significant positive correlation between the cadmium content in wheat straw and grain and the water-soluble exchangeable cadmium in soil, but there was no significant correlation between CD content in wheat straw and grain and water soluble exchange cadmium in soil. The CD content in rice grain was only positively correlated with the soluble CD content in soil, but not in other forms.
【作者單位】： 四川省農(nóng)業(yè)科學(xué)院土壤肥料研究所;重慶市長壽區(qū)農(nóng)業(yè)委員會;大英縣農(nóng)業(yè)局;
【基金】：四川省科技支撐計劃項目(2014NZ0008,2015NZ0108) 四川省農(nóng)業(yè)科學(xué)院公益性項目(2016GYSH-024)
【分類號】：S153;S511;S512.1

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本文編號：1620535