伴矿景天套种密度联合微生物菌剂对镉污染土壤的修复效果研究

韦丽媛; 刘莹儿; 黄静; 庞桢; 陈喆

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (11) : 6208-6217.

土壤污染与控制

伴矿景天套种密度联合微生物菌剂对镉污染土壤的修复效果研究

韦丽媛^1,2, 刘莹儿^1,2, 黄静^1,2, 庞桢^1,2, 陈喆^1,2

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Study on the remediation effects of Sedum plumbizincicola intercropping density combined with microbial agents on cadmium-contaminated soil

WEI Li-yuan^1,2, LIU Ying-er^1,2, HUANG Jing^1,2, PANG Zhen^1,2, CHEN Zhe^1,2

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摘要

利用田间小区试验开展伴矿景天-百香果套种模式研究,设置低(D1:30cmx30cm)、中(D2:25cmx25cm)、高(D3:15cmx15cm) 3种伴矿景天种植密度,并在中密度(D2)基础上分别施加巨大芽孢杆菌(Bm)、胶质芽孢杆菌(Bmk) 2种微生物菌剂.探究不同处理对伴矿景天地上部生物量、重金属Cd和Zn吸收量、土壤修复效果以及对百香果果肉中Cd含量的影响.结果表明,在套种模式下高密度种植(D3)显著提高了伴矿景天地上部生物量和对土壤Cd、Zn的吸收能力,其年均提取量分别比低密度种植(D1)提高了62.5%和72.7%(P<0.05).百香果果肉中Cd含量随着伴矿景天种植密度的增大而减少,并且Cd含量达到国家食品安全标准.此外,伴矿景天-百香果套种联合施加Bmk菌剂促进伴矿景天地上部生长和对Cd、Zn吸收能力的效果更佳.与CK相比,施加Bmk菌剂30d后伴矿景天地上部生物量增加了43.2%,地上部对Cd和Zn吸收量分别提高了7.02%和20.9%.微生物菌剂的联合应用显著降低了根际和非根际土壤pH值,显著提高根际土壤和非根际土壤有效态Cd和Zn的含量(P<0.05).施加2种菌剂对伴矿景天的生长促进作用及镉污染土壤修复效果表现为Bmk>Bm,为完善伴矿景天套种模式下土壤重金属修复提供了理论依据.

Abstract

Field plot experiments were conducted to study the intercropping systems of the hyperaccumulator Sedum plumbizincicola and passion fruit. Three planting densities of S. plumbizincicola were tested: low (D1: 30cm×30cm), medium (D2: 25cm×25cm), and high (D3: 15cm×15cm). Additionally, two microbial agents, Bacillus megaterium (Bm) and Bacillus mucilaginosus (Bmk), were applied at the medium density (D2). The effects of different treatments on the plant growth, heavy metal accumulation, and phytoextraction efficiency were investigated. The results showed that under the intercropping system, high density planting (D3) significantly increased the aboveground biomass of S. plumbizincicola and its phytoextraction efficiency for soil Cd and Zn, with annual extraction rates increased by 62.5% and 72.7%, respectively, compared with low density planting (D1) (P<0.05). The Cd content in passion fruit pulps decreased with increasing planting density of S. plumbizincicola and met the national food safety standards. Moreover, the application of Bmk in the intercropping system had a better effect on the growth of S. plumbizincicola and its ability to absorb Cd and Zn. Compared with CK, the aboveground biomass of S. plumbizincicola in Bmk treatment increased by 43.2%, and the uptake of Cd and Zn in the aboveground parts increased by 7.02% and 20.9%, respectively. The microbial application significantly reduced the pH value and significantly increased the available Cd and Zn content in both rhizosphere and non-rhizosphere soils, while Bmk had better effect than Bm. In all, this study provides a theoretical basis for improving soil heavy metal remediation under the intercropping system of hyperaccumulators and fruits.

导出引用

韦丽媛, 刘莹儿, 黄静, 庞桢, 陈喆. 伴矿景天套种密度联合微生物菌剂对镉污染土壤的修复效果研究[J]. 中国环境科学. 2025, 45(11): 6208-6217

WEI Li-yuan, LIU Ying-er, HUANG Jing, PANG Zhen, CHEN Zhe. Study on the remediation effects of Sedum plumbizincicola intercropping density combined with microbial agents on cadmium-contaminated soil[J]. China Environmental Science. 2025, 45(11): 6208-6217

中图分类号： X53

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