土壤pH对东南景天修复镉和锌污染土壤的影响

生态学杂志

土壤pH对东南景天修复镉和锌污染土壤的影响

廉梅花^1,2,孙丽娜^2**,胡筱敏¹,汤家喜³

(¹东北大学资源与土木工程学院，沈阳 110004； ^2沈阳大学区域污染环境生态修复教育部重点实验室，沈阳 110044； ^3沈阳农业大学土地与环境学院，沈阳 110866)

出版日期:2014-11-10 发布日期:2014-11-10

Effect of soil pH on phytoremediation of Sedum alfredii Hance in Cd and Zn contaminated soil.

LIAN Mei-hua^1,2, SUN Li-na^2**, HU Xiao-min¹, TANG Jia-xi^3

(¹College of Resources and Civil Engineering, Northeastern University, Shenyang 110004, China; ²Key Laboratory of Regional Environment and EcoRemediation, Ministry of Education, Shenyang University, Shenyang 110044, China; ³College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China)

Online:2014-11-10 Published:2014-11-10

摘要/Abstract

摘要：

采用盆栽方法研究重金属(Zn、Cd) 2种污染水平（T1处理：Zn 1200 mg·kg^-1+Cd 20 mg·kg^-1；T2处理：Zn 300 mg·kg^-1+Cd 2.0 mg·kg^-1）、4个pH水平（4.0、5.5、7.0和8.5）下，土壤Zn、Cd有效态的变化、东南景天吸收和积累特征以及植物对土壤中Zn、Cd的去除效果。结果表明，随着pH的降低，土壤Zn、Cd的有效态含量显著增大，东南景天吸收和积累土壤Zn、Cd的效率显著提高。T1处理时东南景天生物量在pH 5.5时最大，但与其他pH处理的差异并不显著；Zn、Cd在植物地上与地下部分的含量均在pH 4.0时最大。T2处理时东南景天在pH 4.0时体内重金属含量最高，但由于植物生长受到Al和Mn等元素的毒害，此时生物量最小。东南景天对土壤重金属去除率均在pH 5.5时最高，其中T1处理时Cd、Zn去除率分别为16%和1.33%，T2处理时分别为27%和1.09%；2种污染水平土壤重金属的去除率均在pH 8.5时最小。因此，适当降低土壤pH，可有效提高植物积累和去除土壤Zn、Cd的效率。本研究为进一步利用东南景天修复重金属污染土壤、提高植物修复效率提供了科学依据。

关键词: 本土植物, 种间竞争, 种内竞争, 水位波动, 入侵植物

Abstract: A pot experiment was designed to study the changes of available Zn and Cd concentrations, characteristic of uptake, accumulation and removal effect by Sedum alfredii Hance under two treatments (T1: Zn 1200 mg·kg^-1 + Cd 20 mg·kg^-1; T2: Zn 300 mg·kg^-1 + Cd 2.0 mg·kg^-1) and at four pH levels (4.0, 5.5, 7.0 and 8.5). The results showed that available Zn and Cd concentrations in soil and the accumulated two metals by S. alfredii significantly increased with decreasing the pH. Under treatment T1, the highest plant dry weight was found at pH 5.5, but was not significantly different from that at the other three pH levels. The highest metal concentrations in shoot and root were at pH 4.0 for both T1 and T2. However, due to Al and Mn toxicity induced by low pH, plant had the lowest biomass at pH 4.0 for T2. The metal removal rate of S. alfredii was highest at pH 5.5, and lowest at pH 8.5 for both treatments. At pH 5.5, S. alfredii removed 16% and 1.33% of total Cd, Zn for T1, and 27%, 1.09% for T2, respectively. Overall, decreasing pH appropriately enhanced the removal efficiencies of Cd and Zn in soil by S. alfredii, and it may be a useful approach to enhance the phytoremediation of Cd and Zn contaminated soils by S. alfredii.

Key words: native plant, water level fluctuation, inter-specific competition, intra-specific competition, invasive plant

廉梅花1,2,孙丽娜2**,胡筱敏1,汤家喜3. 土壤pH对东南景天修复镉和锌污染土壤的影响[J]. 生态学杂志.

LIAN Mei-hua1,2, SUN Li-na2**, HU Xiao-min1, TANG Jia-xi3. Effect of soil pH on phytoremediation of Sedum alfredii Hance in Cd and Zn contaminated soil.[J]. cje.

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