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Chemosphere：生物炭中的鹽分影響水稻對(duì)土壤鎘的吸收累積
期刊：Chemosphere
主題：生物炭中的鹽分影響水稻對(duì)土壤鎘的吸收累積
標(biāo)題：Chlorine weaken the immobilization of Cd in soil-rice systems by biochar
影響因子：5.108
檢測指標(biāo)：Cd2+流速
Cd2+流實(shí)驗(yàn)處理方法：5天的水稻幼苗，6mM NaCl瞬時(shí)處理
Cd2+流實(shí)驗(yàn)測試液成份：0.1mM KCl, 0.1 mM CaCl2, 0.01mM CdCl2, pH= 5.8
作者：福建農(nóng)林大學(xué)王果、李葒葒
英文摘要
Rice (Oryza sativa L.) was c*ted in a Cd-contaminated soilswith rice straw biochar (BC) and water-washed rice straw biochar (W-BC) wereapplied to investigate the underlying mechanisms and possible reasons for biochar'sweakening effects on the immobilization of Cd in soil-rice system.
The results indicated that W-BC reduced the Cd concentration inpore water as well as in the roots and shoots of rice by 26.24%, 53.23% and62.47% respectively. On the contrary, there was an increase in Cd contents by50.27% in pore water, 2.32% in the roots, and 12.80% in the shoots of riceunder BC treatment. Furthermore, Cd content in rice shoot was significantly andpositively correlated with Cl− addition to the soil (P<0.01).
This phenomenon could be attributed to several combined effects:(1) the increase of Cl− in the soil decreased the soil pH, enhanced thedissolved organic carbon in soil pore water and increased the complexes of Cd2+and Cl−, resulting in the release of Cd from solid phase into solution phase,(2) the chloride in the soil increased the uptake of CdCl+ instead of Cd2+ bythe roots, thereby causing an increase of Cd in rice tissues. These resultsdemonstrate for the first time that biochar with high chloride content couldweaken its immobilization effects on soil Cd and even enhance Cd uptake byrice.
中文摘要
水稻（Oryza sativa L.）在鎘污染土壤中種植稻草生物炭（BC）和水洗稻草生物炭（W-BC），以研究生物炭對(duì)生物炭減弱作用的潛在機(jī)制和可能的原因。土壤 - 水稻體系中Cd的固定化。
結(jié)果表明，W-BC使孔隙水以及水稻根冠中Cd含量分別降低26.24％，53.23％和62.47％。相反，在BC處理下，孔隙水中Cd含量增加50.27％，根中Cd含量增加2.32％，水稻枝條中Cd含量增加12.80％。水稻中Cd含量與土壤中Cl-的含量呈顯著正相關(guān)（P <0.01）。
這種現(xiàn)象可歸因于以下幾種綜合效應(yīng)：（1）土壤中Cl-的增加降低了土壤pH值，增加了土壤孔隙水中溶解的有機(jī)碳，增加了Cd2+和Cl-的絡(luò)合物，導(dǎo)致了土壤的釋放。 Cd從固相進(jìn)入溶液相，（2）土壤中的氯化物增加了CdCl+對(duì)Cd2+的吸收，從而導(dǎo)致水稻組織中Cd的增加。這些結(jié)果表明，氯含量高的生物炭可以減弱其對(duì)土壤Cd的固定化效應(yīng)，甚至可以提高水稻對(duì)Cd的吸收。
氯添加對(duì)水稻根表鎘離子流的影響