本文關鍵詞：隔溝灌溉下水肥供應頻率對芥菜生理與鎘富集特性影響　出處：《農(nóng)業(yè)機械學報》2017年11期 　論文類型：期刊論文

  更多相關文章： 隔溝灌溉 水肥供應頻率 芥菜 鎘富集 土壤重金屬

【摘要】：研究隔溝灌溉下芥菜生物量及重金屬富集與轉(zhuǎn)移特性,對土壤重金屬污染植物修復具有重要作用。試驗于2014年3月—2015年11月實施,設置灌水頻率(I3、I4、I5分別為灌水3、4、5次,灌溉總量為0.15 m)及追肥頻率(基肥0.74 g/m3,施肥總量1.3 g/m3,追肥次數(shù)F0、F1、F2、F3、F4)2因素處理,結果表明在灌溉頻率影響下,芥菜葉片的超氧化歧化酶活性、脯氨酸隨灌水頻率增加而呈增長,丙二醛呈下降趨勢。生物量、鎘質(zhì)量比、鎘富集系數(shù)、鎘累積總量I4比I3分別提高12.33%~89.71%、5.00%~44.33%、0.50%~55.36%、22.22%~114.81%;I5比I3提高19.21%~87.37%、24.00%~93.51%、13.44%~112.30%、77.42%~168.75%。其中地上部生物量增幅大于根部,鎘質(zhì)量比、鎘富集系數(shù)和鎘累積總量增幅則根部大于地上部。在施肥頻率影響下生物量、鎘質(zhì)量比、鎘富集系數(shù)和鎘累積總量,高頻施肥(F4)比低頻施肥(F1)分別增長22.55%~99.71%、30.68%~87.40%、37.80%~112.20%、71.43%~213.51%,且低頻灌溉情況下根部增幅大于地上部,中、高頻率灌溉下地上部大于根部。另外轉(zhuǎn)移系數(shù)隨水肥供應頻率增加略有下降,但整體維持較高水平。通過模型模擬與驗證,表明年際間芥菜重金屬修復能力對水肥供應頻率響應趨于一致。
[Abstract]:The biomass and heavy metal accumulation and transfer characteristics of mustard under furrow irrigation were studied, which played an important role in phytoremediation of soil contaminated by heavy metals. The experiment was carried out from March 2014 to November 2015. The frequency of irrigation and the frequency of topdressing (0.74 g / m ~ 3 and 1.3 g / m ~ 3) were set respectively. The results showed that the superoxide dismutase activity and proline activity of mustard leaves increased with the increase of irrigation frequency. Malondialdehyde showed a downward trend. Biomass, CD mass ratio, cadmium enrichment coefficient, total cadmium accumulation I _ 4 were increased by 12.33%, 89.71% and 5.00%, respectively, compared with I _ 3, by 44.33%. 0.50, 55.36 and 22.22, about 114.81; I5 is 19.21% higher than I3, 87.37 and 24.00 and 93.51% higher than I3, 13.44% and 112.30% higher than I3. The increase of aboveground biomass was greater than that of root, and the increase of CD mass ratio, CD enrichment coefficient and total cadmium accumulation was larger than that of shoot. Under the influence of fertilization frequency, biomass was increased. The mass ratio of cadmium, the enrichment coefficient of cadmium and the total amount of cadmium accumulation, F4) increased by 22.55%, 99.71%, 30.68% and 87.40%, respectively, compared with those of low frequency fertilization (F1). 37.80 in the case of low frequency irrigation, the increase of the root was greater than that of the ground, and the increase of the root was higher than that of the ground. Under high frequency irrigation, the upper part of the land is larger than the root. In addition, the transfer coefficient decreases slightly with the increase of water and fertilizer supply frequency, but maintains a high level as a whole. The results showed that the response of heavy metal remediation ability of mustard to the frequency of water and fertilizer supply tended to be consistent.
【作者單位】： 江西農(nóng)業(yè)大學農(nóng)學院;江西青年職業(yè)學院經(jīng)濟管理系;江西農(nóng)業(yè)大學國土資源與環(huán)境學院;
【基金】：國家自然科學基金項目(51469008、41661070) 江西省青年科學基金重點項目(20171ACB21024) 江西省科技計劃項目(20151BBF60059) 江西農(nóng)業(yè)大學研究生創(chuàng)新專項資金項目(NDYC2017-B002)
【分類號】：S637;X503.231
【正文快照】： 引言在土壤重金屬污染植物修復領域,印度薺菜作為重要的土壤重金屬修復植物受到國內(nèi)外廣泛關注,主要用來修復土壤中鎘、鉛和鋅等重金屬污染,已有研究結果表明印度芥菜具有顯著的重金屬富集特性且修復效率較高[1],但受土壤水肥環(huán)境影響下印度芥菜生長發(fā)育受到抑制,進而影響土壤，

本文編號：1423838