文章摘要
喀斯特峰丛洼地植被恢复对土壤硝化与反硝化潜势的影响
Variations in nitrification and denitrification potential following vegetation restoration in a Karst peak cluster and depression, southwest China
投稿时间:2018-03-26  修订日期:2018-04-23
DOI:10.13872/j.1000-0275.2018.0034
中文关键词: 植被恢复  氮循环  硝化潜势  反硝化潜势  峰丛洼地  喀斯特
英文关键词: vegetation restoration  nitrogen cycling  nitrification potential  denitrification potential  peak cluster and depression  Karst
基金项目:国家重点研发计划项目(2016YFC0502404);国家自然科学基金项目(41771339);广西自然科学基金(2015GXNSFBA139058)
作者单位E-mail
张青山 中国科学院亚热带农业生态研究所 1098905146@qq.com 
欧阳运东 湖南省邵阳市第二中学 38739219@qq.com 
肖孔操 中国科学院亚热带农业生态研究所 xiaokongcao@isa.ac.cn 
陈浩 中国科学院亚热带农业生态研究所 chenhao10902@isa.ac.cn 
李德军 中国科学院亚热带农业生态研究所 dejunli@isa.ac.cn 
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中文摘要:
      硝化与反硝化是氮素生物地化循环的两个关键过程,同氮素有效性、氮流失及大气与水体质量安全等紧密相关。采用空间代替时间的方法,选择桂西北喀斯特峰丛洼地植被恢复三个典型阶段植被群落为研究对象,以耕作旱地为参照,分析不同植被群落土壤硝化与反硝化潜势,探讨植被恢复对土壤硝化与反硝化潜势的影响及其内在机制。结果表明,不同植被群落土壤硝化和反硝化潜势存在显著差异,硝化潜势均值在18.78~49.08 mgN/(kg.d)之间,具体表现为次生林>旱地≈灌丛≈草丛;反硝化潜势均值在4.09~15.43 mgN/(kg.d)之间,具体表现为次生林≈旱地>草丛≈灌丛。总体上,土壤硝化潜势要大于反硝化潜势,且均是植被演替后期阶段(次生林)显著高于早初期阶段(草—灌丛),草丛和灌丛之间无显著差异性。土壤硝化和反硝化潜势与有机碳(SOC)、硝态氮含量均呈极显著正相关关系(P<0.01),同土壤微生物生物量氮(SMBN)分别呈显著(P<0.05)和极显著正相关关系(P<0.01)。研究表明,SOC、硝态氮含量、SMBN是影响喀斯特峰丛洼地土壤硝化和反硝化潜势的关键共性因子。
英文摘要:
      Nitrification and denitrification are critical processes in nitrogen biogeochemical cycling, and are closely linked with nitrogen availability, nitrogen loss, and safety of water body and atmosphere. Based on space-for-time method, three typical plant communities along the vegetation restoration course in northwest Guangxi were selected in the present study, i.e. grassland, shrubland, secondary forest, and active upland served as reference. The aims of this study were to examine the variations in soil nitrification potential (NP) and denitrification potential (DP) following vegetation restoration course and to explore the underlying mechanisms. The results demonstrated that there were significant differences in soil NP and DP among different restoration stages. Soil NP ranged between 18.78 and 49.08 mgN/(kg.d) and was in the order secondary forest>dryland≈shrubland≈grassland, while soil DP ranged between 4.09 and 15.43 mgN/(kg.d) and was in the order secondary forest≈dryland>grassland≈shrubland. In sum, soil NP was greater than DP at all restoration stages. Furthermore, soil NP and DP were significantly higher at the late stage than those at early stages of vegetation restoration. No significant differences were observed in soil NP and DP between grassland and shrubland. Both soil NP and DP were highly significantly correlated with soil organic carbon (SOC) and nitrate contents (P<0.01). Additionally, soil NP and DP were significantly (P<0.05) and highly significantly (P<0.01) correlated with soil microbial biomass nitrogen (SMBN), respectively. It is suggested that SOC, nitrate content and SMBN were the most critical common factors controlling soil NP and DP in the karst area.
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