煤矸石对盐碱土壤绿化和土壤微生物的影响
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孔涛(1981-),男,陕西渭南人,副教授,博士,在站博士后,主要从事土壤微生物研究。E-mail:kongtao2005@126.com

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TQ536;S156.4

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国家自然科学基金项目(51574145);辽宁省高等学校基本科研项目(LJ2017QL015)


Effects of Coal Gangue on Revegetation and Microbial Properties of an Alkali-saline Soil
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    摘要:

    为探究煤矸石对盐碱土壤绿化的改良效果和对土壤微生物的影响,将不同用量(0,10%,20%,30%,40%,50%)和不同粒径(小粒径<1 mm,中粒径1~5 mm,大粒径>5 mm,以及小中大粒径等比例的混合粒径)煤矸石施用于盐碱土壤,进行紫花苜蓿盆栽试验,测定紫花苜蓿株高、生物量以及土壤微生物量和酶活性指标。结果表明,不同粒径煤矸石处理的土壤微生物量碳氮,土壤的脲酶、过氧化氢酶、脱氢酶活性,以及紫花苜蓿株高、生物量均随着煤矸石用量的增加呈先增大后降低的趋势,混合粒径、小粒径、中粒径、大粒径煤矸石处理的盐碱土上述指标分别在20%,20%,30%,40%用量下达到峰值。其中,20%用量的混合粒径煤矸石在盐碱土壤的绿化方面应用效果最好,将紫花苜蓿株高和鲜重分别显著提高了34.86%和45.28%。因而,一定用量的煤矸石可以改善盐碱土壤的生态质量,20%用量的混合粒径煤矸石可以作为盐碱土壤绿化的改良剂。

    Abstract:

    To investigate the effects of coal gangue on revegetation and microbial properties of an alkali-saline soil, coal gangues with different application rates (0, 10%, 20%, 30%, 40%, 50%) and different particle sizes (small-size of <1 mm, medium-size of 1~5 mm, large-size of >5 mm, mixed-size) were applied to an alkali-saline soil. Then the alfalfa pot experiment was conducted to determine the height and biomass of alfalfa and soil microbial biomass and enzymes activities. The results showed that soil microbial biomass C and N, activities of urease, catalase and dehydrogenase, as well as plant height and biomass of alfalfa all increased first and then decreased with the increase of coal gangue application rates. As for the mixed-size, small-size, medium-size, and large-size coal gangue treatments, the above soil properties reached their peaks when the application rates were 20%, 20%, 30%, and 40%, respectively. Among them, coal gangue application rate of 20% with mixed partical size gave the best improvement effect on revegetation of alkali-saline soil. The plant height and fresh weight of alfalfa significantly were increased by 34.86% and 45.28%, respectively. Therefore, the application of coal gangue could improve the ecological quality of saline-alkali soil. The coal gangue with mixed particle size and 20% application rate could be used as an effective amendment for the revegetation of alkali-saline soil.

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孔涛, 郑爽, 张莹, 吴丹, 韩一诺, 梁冰.煤矸石对盐碱土壤绿化和土壤微生物的影响[J].水土保持学报,2018,32(6):321~326

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  • 收稿日期:2018-05-28
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  • 在线发布日期: 2018-12-21
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