亚热带不同演替阶段森林土壤可溶性有机氮与酶活性特征
作者:
作者单位:

1.中南林业科技大学环境科学与工程学院;2.中南林业科技大学生命科学与技术学院

作者简介:

通讯作者:

基金项目:

国家自然科学基金项目(31470629);中南林业科技大学研究生创新基金项目(CX20192079)


Characteristics of soluble organic nitrogen and soil enzyme activities in subtropical forest along a restoration gradient
Author:
Affiliation:

1.College of Environmental Science and Engineering, Central South University of Forestry and Technology;2.College of Life Science and Technology, Central South University of Forestry and Technology

Fund Project:

National Natural Science Foundation of China (31470629); Postgraduate Innovation Project Fund of Central South University of Forestry and Technology (CX20192079).

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
    摘要:

    森林演替中的土壤氮素转化是生态系统的关键过程,其相互关系的研究正受到愈来愈多的重视,探讨土壤可溶性有机氮(SON)和酶活性对维持森林生态系统氮循环及植被恢复、森林生态系统管理有重要的意义。在湖南省长沙县大山冲森林公园不同演替阶段三种林地(针叶林、落叶阔叶林和常绿阔叶林)的1 hm2长期观测样地,采集表层土壤样品,测定SON和葡糖胺糖苷酶、葡萄糖苷酶和木糖苷酶酶活性,分析亚热带常绿阔叶林演替序列森林土壤SON和酶活性特征,探讨其特征及其与土壤理化性质的关系。结果表明:森林土壤SON表现为常绿阔叶林>落叶阔叶林>针叶林,且针叶林的铵态氮(NH4+-N)、硝态氮(NO3--N)、微生物生物量氮(MBN)、总氮(TN)均低于常绿阔叶林和落叶阔叶林(P<0.05);阔叶林土壤葡糖胺糖苷酶、葡萄糖苷酶和木糖苷酶明显高于针叶林,常绿阔叶林土壤与三种酶底物的亲和力最强,而落叶阔叶林土壤酶活性最高;冗余分析显示SON与三种酶活性均存在显著正相关关系,葡糖胺糖苷酶活性和亲和力与土壤TN、NH4+-N和MBN呈显著正相关。研究表明,亚热带不同演替阶段森林土壤SON和酶活性差异明显;SON随植被正向演替而增加,SON转化相关的酶活性亦随植被正向演替而增强。亚热带森林植被正向演替伴随着土壤氮素养分快速循环过程。

    Abstract:

    The transformation of soil nitrogen (N) along a forest succession is a key process of the ecosystem, and the study of its relationship is receiving more and more attention. Exploring the characteristics of the SON and enzyme activity is of great significance for maintaining the N cycling in forest ecosystem, vegetation restoration, and forest management. In order to study the characteristics of soil SON and enzyme activity at different succession stages of subtropical forests and their relationship with soil physical and chemical properties, one hectare long-term observation plot of three forests at different succession stages (coniferous forest, deciduous broad-leaved forest and evergreen broad-leaved forest) in Dashanchong Forest Park in Changsha County, Hunan Province was selected to collect surface soil samples to determine SON and glucosamine glycosidase (NAG), glucosidase (BG) and xylosidase (BX) enzyme activities. Results showed that: soil SON concentrations in three forests were in the order of evergreen broad-leaved forest, deciduous broad-leaved forest, and coniferous forest. In addition, the ammonium nitrogen (NH4+-N), nitrate nitrogen (NO3--N), microbial biomass nitrogen (MBN) and total nitrogen (TN) in coniferous forest were lower than evergreen broad-leaved forest and deciduous broad-leaved forest (P<0.05). Soil NAG, BG, and BX in broad-leaved forests were significantly higher than those in coniferous forest, evergreen broad-leaved forest soil had the strongest enzyme affinity, while deciduous broad-leaved forest soil had the highest enzyme activity. Redundancy analysis showed that SON have a significant positive correlation with the activities of the three enzymes, and NAG activity and affinity were significantly positive correlation with soil TN, NH4+-N, and MBN. Studies have shown that there were significant differences in SON and enzyme activities in forest soils at different succession stages in the subtropical area. SON concentration increased during forest succession, and the enzyme activity related to SON transformation also increased. The positive succession of subtropical forest is accompanied by a rapid cycling process of soil N nutrients.

    参考文献
    相似文献
    引证文献
引用本文
分享
文章指标
  • 点击次数:
  • 下载次数:
历史
  • 收稿日期:2020-11-29
  • 最后修改日期:2021-02-05
  • 录用日期:2021-02-07
  • 在线发布日期:
您是第位访问者
版权所有:《农业现代化研究》编辑部
地址:湖南省长沙市芙蓉区远大二路644号 邮编:410125
电话:0731-84615231    E-mail:nyxdhyj@isa.ac.cn
技术支持:北京勤云科技发展有限公司