本文選題：水稻 + 土壤Cd　； 參考：《環(huán)境科學(xué)學(xué)報》2017年04期

【摘要】：通過盆栽種植實驗研究了pH值為3.5~6.5的灌溉水對稻田土壤pH值、土壤Cd生物有效性以及2種水稻品種各部位Cd含量的影響.結(jié)果表明:1不同pH值灌溉水對土壤pH值影響顯著.灌溉水pH為3.5~6.5的處理下,湘晚秈土壤pH值下降了0.6~0.3個單位,威優(yōu)46號土壤pH值下降了0.7~0.4個單位.2隨著灌溉水pH值的升高,土壤交換態(tài)和TCLP提取態(tài)Cd含量(生物有效性)均有降低的趨勢,但TCLP提取態(tài)Cd含量不顯著.3隨著灌溉水pH值從3.5上升到6.5,湘晚秈12號水稻植株各部位Cd含量均逐漸下降,而威優(yōu)46號水稻植株各部位的Cd含量逐漸上升.與pH=3.5處理相比,澆灌pH值為4.5~6.5的灌溉水,湘晚秈12號根系、莖葉、谷殼和糙米中Cd含量分別下降32.3%~48.0%、16.5%~48.0%、40.0%~56.2%和45.6%~73.9%;相反,威優(yōu)46號根系、莖葉、谷殼和糙米中Cd含量分別上升30.5%~446.3%、5.3%~201.1%、70.3%~316.7%和71.0%~177.2%.顯然,升高灌溉水的pH值有利于降低湘晚秈12號(常規(guī)稻)糙米中的Cd含量,但不利于降低威優(yōu)46號(雜交稻)糙米中的Cd含量.
[Abstract]:Pot planting experiment was conducted to study the effects of irrigation water with pH value of 3.5 ~ 6.5 on soil pH value, CD bioavailability and CD content in different parts of two rice varieties. The results showed that the effects of different pH values on soil pH were significant. When the pH of irrigation water was 3.5 ~ 6.5, the pH value of Xiang-late indica rice soil decreased by 0.6 ~ 0.3 units, and the soil pH value of Weiyou 46 decreased by 0.7 ~ 0.4 unit .2 with the increase of irrigation water pH value. The content of CD (bioavailability) in both soil exchange state and TCLP extract decreased, but the CD content of TCLP extract was not significant with the increase of pH value of irrigation water from 3.5 to 6.5, and CD content in all parts of Xiangduan 12 rice plant decreased gradually. However, CD content in different parts of rice plant Weiyou 46 increased gradually. Compared with pH=3.5 treatment, the content of CD in the root system, stem leaf, grain hull and brown rice decreased 32.38.0%, 48.0%, 40.0% and 75.2%, respectively. On the contrary, the CD content in root system, stem leaf, grain husk and brown rice of Weiyou 46 was increased by 30.5 ~ 446.35.3jiong and 70.3316.7% and 71.0% and 177.2respectively, compared with that of pH=3.5 treatment, while the content of CD in root system, stem leaf, grain husk and brown rice was increased by 30.5%, 446.33.35%, 201.201.1the CD content was 70.3316.7% and 71.0%, 177.2%, respectively, in the root system, stem leaf, grain husk and brown rice of Weiyou 46, and the content of CD in the root system, stem leaf, grain husk and brown rice was increased respectively. It was obvious that increasing the pH value of irrigation water was beneficial to the reduction of CD content in the brown rice of Xiangduan Indica No. 12 (conventional rice), but not to the CD content in the brown rice of Weiyou 46 (hybrid rice).
【作者單位】： 中南林業(yè)科技大學(xué)環(huán)境科學(xué)與工程學(xué)院;
【基金】：農(nóng)業(yè)部財政部科研專項(No.NBCH2016-6) 國家自然科學(xué)基金(No.41501344) 湖南省重點學(xué)科建設(shè)項目(No.2006180)~~
【分類號】：X53;X56

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