植被退化对温带典型草原根系-土壤系统碳氮分配的影响

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 植被退化对温带典型草原根系-土壤系统碳氮分配的影响 DOI: 10.5846/stxb201612312725 作者: 作者单位: 内蒙古大学生态与环境学院,内蒙古大学生态与环境学院,内蒙古大学生态与环境学院,内蒙古大学生态与环境学院,内蒙古大学生态与环境学院,内蒙古大学生态与环境学院,内蒙古大学生态与环境学院,内蒙古大学生态与环境学院 作者简介: 通讯作者: 中图分类号: 基金项目: 国家自然科学基金青年基金项目（31400391）；国家自然科学基金地区科学基金项目（31560146）；内蒙古自治区自然科学基金项目（2016MS0330）；第57批中国博士后科学基金面上项目（2015M571289）；内蒙古自治区自然科学基金项目（2017BS0311） Effects of vegetation degradation on carbon and nitrogen distribution of roots-soil system in temperate typical steppe Author: Affiliation: College of ecology and environment,Inner Mongolia University,College of ecology and environment,Inner Mongolia University;China,,,,, Fund Project: The Inner Mongolia Autonomous Region Natural Science Foundation;The fifty-seventh batch of Chinese postdoctoral science fund 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:以3种不同退化程度的温带典型草原（大针茅轻度退化、中度退化和重度退化）为研究对象，研究植被退化对温带典型草原土壤及根系碳氮含量及储量的影响。结果显示：（1）植被退化对地下根系碳含量影响不显著（P > 0.05），而对地下根系氮含量的影响显著（P < 0.05），中度退化样地根系氮含量显著高于轻度退化和重度退化样地（P < 0.05）。（2）植被退化对根系碳氮储量影响显著（P < 0.05），根系碳氮储量随着土层深度增加而减少，总根系碳氮储量随退化程度加剧而降低。（3）土壤有机碳、总碳和总氮含量及储量均受退化程度和采样深度的影响显著（P < 0.05），其含量随着土壤深度的增加而显著减少，随退化程度加剧而显著降低（P < 0.05）。（4）土壤是根系-土壤系统碳氮储存的最主要场所，储量占比90%以上。虽然土壤碳氮储量均存在表层聚集现象，但表层储量所占比例在各样地间差异显著（P < 0.05）。 Abstract:The objective of this article was to determine the influence of vegetation degradation on carbon and nitrogen storage in root-soil systems. We studied three typical temperate steppes with different levels of degradation in Inner Mongolia, including three different degraded temperate grasslands (Stipa grandis light degradation, moderate degradation, and severe degradation). The effects of vegetation degradation on soil carbon and nitrogen content in typical temperate steppe root-soil systems were studied. The results showed that:(1) the effect of vegetation degradation on carbon concentration of underground roots was not significant (P > 0.05), but the effect on the nitrogen concentration of underground roots was significant (P < 0.05). The nitrogen concentration of roots in the moderately degraded plot was significantly higher than in the light degradation and severe degradation plots. (2) the effects of vegetation degradation on carbon and nitrogen storage of root systems was significant (P < 0.05). Carbon and nitrogen reserves decreased with increasing levels of degradation. Carbon and nitrogen storage of roots in three study plots decreased as depth increased. (3) there were significant differences in soil organic carbon and nitrogen between different sampling plots (P < 0.05). With the increase in soil depth, the content of soil organic carbon and nitrogen decreased. The carbon and nitrogen storage of soil decreased as degradation increased. (4) Soil is the main carbon and nitrogen pool in root-soil systems. About 90% of carbon and nitrogen were stored in soil. In soil systems, carbon and nitrogen were stored mainly in the top soil layer. The effect of vegetation degradation on the proportion of carbon and nitrogen content in the top soil layer, however, was not significant (P < 0.05). 参考文献 相似文献 引证文献