【摘要】：采用盆栽試驗和Tessier連續(xù)形態(tài)分析方法,研究了不同鎘污染水平下(1.0、2.5、5.0 mg·kg-1),施入不同量的生物質(zhì)炭(0.0、2.5、5.0、10.0 g·kg-1)對根際與非根際土壤中鎘形態(tài)轉(zhuǎn)化及水稻鎘累積的影響。結(jié)果表明,(1)施入生物質(zhì)炭后,根際與非根際土壤中鎘的有效性降低。施入生物質(zhì)炭后,根際與非根際土壤可交換態(tài)、碳酸鹽結(jié)合態(tài)、鐵錳氧化物結(jié)合態(tài)以及有機物結(jié)合態(tài)鎘最大可分別降低34.64%和28.15%、49.27%和63.82%、34.58%和24.59%、60.04%和49.00%,殘渣態(tài)鎘最大可分別增加14.79%和16.57%。10.0 g·kg-1生物質(zhì)炭處理影響效果最顯著。在不同處理下,鎘形態(tài)變化顯著且根際與非根際之間的變化呈顯著性差異。中低鎘污染水平下,施入生物質(zhì)炭,根際與非根際土壤中鎘形態(tài)變化趨于一致但鎘形態(tài)含量存在差異。高鎘污染水平下,生物質(zhì)炭引起根際與非根際土壤中鎘形態(tài)變化但不顯著。(2)施入生物質(zhì)炭可顯著降低水稻各部分鎘含量且水稻根部鎘含量大于地上部鎘含量。在不同鎘污染程度下,不同施入量生物質(zhì)炭處理與對照相比,地上部、根部鎘含量最大可分別降低42.51%、22.86%;根部鎘含量最大是地上部的2.63倍。10.0 g·kg-1生物質(zhì)炭對水稻各部分鎘含量降低效果最明顯。
[Abstract]:Pot experiment and Tessier continuous speciation analysis were used to study the effects of different amounts of biomass carbon (0.02.55.0g kg-1) on cadmium transformation and cadmium accumulation in rhizosphere and non-rhizosphere soil under different cadmium pollution levels (1.0 ~ 2.5g / 5.0 mg kg-1). The results showed that: (1) the availability of cadmium in rhizosphere and non-rhizosphere soil decreased after applying biomass charcoal. After the application of biomass charcoal, the exchangeable and carbonate bound forms of rhizosphere and non-rhizosphere soil were observed. The maximum reduction of Fe and mn oxide bound and organic bound cadmium were 34.64% and 28.15%, 49.27% and 63.82% and 24.590.04% and 49.00%, respectively. The residual cadmium content increased by 14.79% and 16.570.10.0 g kg-1, respectively. Under different treatments, the morphological changes of cadmium were significant and there were significant differences between rhizosphere and non-rhizosphere. Under the medium and low cadmium pollution level, the changes of cadmium forms in rhizosphere and non-rhizosphere soil tended to be the same, but there were differences in cadmium speciation content when biomass charcoal was applied. Under the high cadmium pollution level, biomass carbon caused the change of cadmium form in rhizosphere and non-rhizosphere soil, but it was not significant. (2) applying biomass charcoal could significantly reduce the cadmium content of rice, and the CD content in the root of rice was higher than that in the aboveground. Under different levels of cadmium pollution, the aboveground parts were treated with different amounts of biomass carbon, compared with the control. The maximum cadmium content in roots was decreased by 42.51% and 2.63 times as much as that in aboveground parts, respectively. 10.0 g kg-1 biomass charcoal had the most obvious effect on the reduction of cadmium content in rice.
【作者單位】： 云南農(nóng)業(yè)大學資源與環(huán)境學院;
【基金】：國家自然科學基金項目(41301349) 云南省應用基礎研究計劃項目(2013FB043)
【分類號】：X53;X56

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