X img

官方微信

img

群号:冰川冻土交流群

QQ群:218834310

高级检索
作者投稿 专家审稿 编辑办公 编委办公 主编办公

冰川冻土 ›› 2020, Vol. 42 ›› Issue (2): 662-670.doi: 10.7522/j.issn.1000-0240.2020.0014

• 冰冻圈水文与水资源 • 上一篇    下一篇

三江源高寒草甸不同退化阶段植被和土壤呼吸特征

张光茹1,5(), 张法伟2, 杨永胜1,6, 贺慧丹3, 祝景彬1,5, 罗谨1, 王春雨1,5, 罗方林1,5, 王军邦1,4, 李英年1,6()   

  1. 1.中国科学院 西北高原生物研究所,青海 西宁 810008
    2.洛阳师范学院 生命科学学院,河南 洛阳 471934
    3.枣庄学院,山东 枣庄 277100
    4.中国科学院 地理科学与资源研究所,北京 100101
    5.中国科学院大学,北京 100049
    6.中国科学院 高原生物适应与进化重点实验室,青海 西宁 810008
  • 收稿日期:2019-11-11 修回日期:2020-03-18 出版日期:2020-08-31 发布日期:2020-09-11
  • 通讯作者: 李英年 E-mail:18404967849@163.com;ynli@nwipb.cas.cn
  • 作者简介:张光茹(1994 - ), 女, 山东潍坊人, 2017年在山西农业大学获学士学位, 现为中国科学院西北高原生物研究所在读硕士研究生, 从事全球变化生态学研究. E-mail: 18404967849@163.com
  • 基金资助:
    国家重点研发计划项目(2017YFA0604802);国家自然科学基金项目(41877547);青海省科技基础条件平台项目(2018-ZJ-T09)

Vegetation and soil respiration at different degradation stages of an alpine meadow in the Sanjiangyuan region

Guangru ZHANG1,5(), Fawei ZHANG2, Yongsheng YANG1,6, Huidan HE3, Jingbin ZHU1,5, Jin LUO1, Chunyu WANG1,5, Fanglin LUO1,5, Junbang WANG1,4, Yingnian LI1,6()   

  1. 1.Northwest Institute of Plateau Biology,Chinese Academy of Sciences,Xining 810008,China
    2.College of Life Sciences,Luoyang Normal University,Luoyang 471934,Henan,China
    3.Zaozhuang University,Zaozhuang 277100,Shandong,China
    4.Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China
    5.University of Chinese Academy of Sciences,Beijing 100049,China
    6.Key Laboratory of Adaptation and Evolution of Plateau Biota,Chinese Academy of Sciences,Xining 810008,China
  • Received:2019-11-11 Revised:2020-03-18 Online:2020-08-31 Published:2020-09-11
  • Contact: Yingnian LI E-mail:18404967849@163.com;ynli@nwipb.cas.cn

摘要:

通过监测三江源玛沁县高寒草甸2017年度植被特征及土壤呼吸通量, 探讨了不同退化阶段植被群落、 土壤呼吸特征及其协同关系, 并分析了土壤呼吸的温度敏感性。结果表明: 随着高寒草甸退化程度加剧, 禾本科植物重要值降低, 毒杂草显著增加(P<0.05); 植被盖度、 物种数、 多样性指数显著下降(P<0.05), 重度退化阶段的地上生物量比轻度、 中度退化阶段降低了25.36%、 22.37%(P<0.05); 在中度退化条件下, 均匀度指数和地下生物量显著增多(P<0.05)。在各退化阶段, 土壤呼吸年内均呈单峰式变化过程, 表现出生长季高、 非生长季低的特征, 植物生长旺季(7 - 8月)最高, 且与5 cm深度处土壤温度之间呈显著指数关系(P<0.05); 2017年轻度退化、 中度退化和重度退化阶段的土壤呼吸碳排放总量分别为626.89 gC·m-2、 386.66 gC·m-2、 393.81 gC·m-2; 同时, 土壤呼吸与植被群落演替具有显著的协同性, 随着退化程度加剧土壤呼吸速率下降。轻度退化、 中度退化、 重度退化阶段土壤呼吸的温度敏感性系数(Q10)分别为2.82、 3.54和2.35, 表明中度退化条件下的温度敏感性最强, 重度退化条件下最弱。

关键词: 高寒草甸, 退化阶段, 植被群落特征, 土壤呼吸, 协同关系, 三江源

Abstract:

Vegetation community, soil respiration characteristics and their relationships at different degradation stages were explored, and the temperature sensitivity of soil respiration was analyzed by monitoring the vegetation and soil respiration at different degradation stages of an alpine meadow in Maqen County, Sanjiangyuan region in 2017. The results show that: As the degree of degradation increase, the Gramineae decreases, but poisonous weed increases significantly (P<0.05); vegetation coverage, species index, and diversity index decrease significantly (P<0.05). The aboveground biomass under the condition of heavy degradation has decreased by 25.36% and 22.37% in comparison with light and moderate degradation (P<0.05). Under the condition of moderate degradation, evenness index and underground biomass increased significantly (P<0.05). Soil respiration at each degradation stage has a unimodal change during the year, showing high in growing season and low in non-growing season, especially in a highest peak growth period (July - August) of the vegetation and a significant exponential relationship with soil temperature at 5 cm depth (P<0.05); total soil respiration emissions in 2017 under light, moderate and heavy degradation are 626.89 gC·m-2, 386.66 gC·m-2 and 393.81 gC·m-2, respectively. Soil respiration rate decreases with the degree of degradation. Temperature sensitivity coefficients (Q10) of soil respiration at light degradation, moderate degradation and heavy degradation stages are 2.82, 3.54, and 2.35, respectively, indicating that the temperature sensitivity is the highest under moderate degradation and the lowest under heavy degradation. These results would be useful for understanding the vegetation and soil respiration characteristics at different degradation stages of alpine meadows on the Tibetan Plateau.

Key words: alpine meadow, degradation stages, vegetation community characteristics, soil respiration, synergistic relationship, Sanjiangyuan region

中图分类号: 

  • S812.2