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Cd胁迫下城郊农业土壤微生物活性对生物炭输入的响应

张阳阳 胡学玉 余 忠 张 迪

张阳阳, 胡学玉, 余 忠, 张 迪. Cd胁迫下城郊农业土壤微生物活性对生物炭输入的响应[J]. 环境科学研究, 2015, 28(6): 936-942.
引用本文: 张阳阳, 胡学玉, 余 忠, 张 迪. Cd胁迫下城郊农业土壤微生物活性对生物炭输入的响应[J]. 环境科学研究, 2015, 28(6): 936-942.
ZHANG Yangyang, HU Xueyu, YU Zhong, ZHANG Di. Responses of Agricultural Soil Microbial Activity to Biochar under Cadmium Stress[J]. Research of Environmental Sciences, 2015, 28(6): 936-942.
Citation: ZHANG Yangyang, HU Xueyu, YU Zhong, ZHANG Di. Responses of Agricultural Soil Microbial Activity to Biochar under Cadmium Stress[J]. Research of Environmental Sciences, 2015, 28(6): 936-942.

Cd胁迫下城郊农业土壤微生物活性对生物炭输入的响应

基金项目: 国家自然科学基金项目(41371485,41071159);湖北省自然科学基金重点项目(2014CFA116)

Responses of Agricultural Soil Microbial Activity to Biochar under Cadmium Stress

  • 摘要: 为了探究Cd胁迫下生物炭输入对城郊农业土壤微生物活性的影响,通过室内培养试验,分析CK处理(风干土壤)、Cd处理(风干土壤+外源Cd)、CdBC处理〔风干土壤+外源Cd+2%生物炭,即生物炭与土壤(以湿质量计)质量比为2%〕、BC处理(风干土壤+2%生物炭)对土壤呼吸、土壤微生物数量及土壤酶活性的影响. 结果表明:整个培养期(0~60 d)内,各处理下土壤CO2累积释放量表现为CK处理<Cd处理<CdBC处理<BC处理. 与CK处理相比,CdBC处理下生物炭输入能显著增加土壤CO2累积释放量(P<0.05),增幅为43.6%,并且土壤中细菌、放线菌、真菌数量也有显著增加(P<0.05),增幅分别达到12.7%、62.7%、18.7%. Cd胁迫对土壤酶活性的抑制表现为蔗糖酶<脲酶<中性磷酸酶,抑制率分别为3.5%、6.8%、18.0%. 生物炭输入可使受Cd胁迫的土壤脲酶、蔗糖酶的活性有所增强,增幅分别为15.0%、18.4%. 可见,生物炭输入可在不同程度上缓解Cd胁迫对蔗糖酶、脲酶活性及土壤微生物数量的影响.

     

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