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不同植被类型下土壤胡敏酸降解特性

付东磊 刘梦云 刘 林 常庆瑞 左进香 罗 勤 赵 彤

付东磊, 刘梦云, 刘 林, 常庆瑞, 左进香, 罗 勤, 赵 彤. 不同植被类型下土壤胡敏酸降解特性[J]. 环境科学研究, 2014, 27(5): 513-519. doi: 10.13198/j.issn.1001-6929.2014.05.09
引用本文: 付东磊, 刘梦云, 刘 林, 常庆瑞, 左进香, 罗 勤, 赵 彤. 不同植被类型下土壤胡敏酸降解特性[J]. 环境科学研究, 2014, 27(5): 513-519. doi: 10.13198/j.issn.1001-6929.2014.05.09
FU Dong-lei, LIU Meng-yun, LIU Lin, CHANG Qing-rui, ZUO Jin-xiang, LUO Qin, ZHAO Tong. Decomposition Characteristics of Soil Humic Acid Under Different Vegetation Types[J]. Research of Environmental Sciences, 2014, 27(5): 513-519. doi: 10.13198/j.issn.1001-6929.2014.05.09
Citation: FU Dong-lei, LIU Meng-yun, LIU Lin, CHANG Qing-rui, ZUO Jin-xiang, LUO Qin, ZHAO Tong. Decomposition Characteristics of Soil Humic Acid Under Different Vegetation Types[J]. Research of Environmental Sciences, 2014, 27(5): 513-519. doi: 10.13198/j.issn.1001-6929.2014.05.09

不同植被类型下土壤胡敏酸降解特性

doi: 10.13198/j.issn.1001-6929.2014.05.09
基金项目: 陕西省自然科学基础研究计划项目(2013JQ5012);西北农林科技大学科研业务费专项资金项目(QN2011156)

Decomposition Characteristics of Soil Humic Acid Under Different Vegetation Types

  • 摘要: 为了解不同植被类型下土壤HA(胡敏酸)降解菌的种类、分布状况及其中C的降解程度,选取退耕还林典型地带,于农田、油松、刺槐、沙棘、混交林0~10cm土样中分别提取HA,利用HA作为唯一C、N源筛选HA降解微生物. 结果表明:相比农田土壤HA,各林地土壤HA中w(C)增加,w(N)有所减少;共分离获得5株HA降解菌,根据16s rRNA序列鉴定,分别为Bacillus licheniformis、Rhizobium nepotum、Microbacterium resistens、Stenotrophomonas maltophilia、Streptomyces azureus,相似度分别为99.65%、99.78%、98.71%、99.23%、99.78%. 农田、刺槐、油松及混交林的降解菌优势种为Bacillus licheniformis,沙棘优势种为Streptomyces azureus,刺槐无Rhizobium nepotum分布,沙棘和混交林无Stenotrophomonas maltophilia分布;降解菌数量为沙棘>刺槐>农田>油松>混交林,混交林仅为沙棘的58.87%;混交林、油松、沙棘、刺槐降解菌的RC(呼吸量碳)分别较农田高出25.35%、11.28%、10.36%、7.11%,混交林与农田差异显著(P<0.05). 沙棘、刺槐、农田、油松降解菌MBC(微生物生物量碳)分别较混交林高出131.91%、68.48%、64.98%、54.47%,刺槐、农田、油松三者与沙棘及混交林差异显著(P<0.05). 沙棘土壤HA的TDR(总降解率)明显高于农田和混交林(P<0.05). 相关性分析表明,降解菌数量与MBC呈极显著正相关,与RC呈极显著负相关(P<0.01). 结果表明,植被类型影响了土壤HA降解菌的群落组成及其降解特性.

     

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出版历程
  • 收稿日期:  2013-10-24
  • 修回日期:  2013-12-18
  • 刊出日期:  2014-05-25

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