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中国沙漠 ›› 2025, Vol. 45 ›› Issue (4): 334-342.DOI: 10.7522/j.issn.1000-694X.2025.00174

• • 上一篇    

极端干旱对科尔沁沙地小叶锦鸡儿( Caragana microphylla )灌丛土壤呼吸的影响

夏咪1,2(), 罗亚勇1,2(), 赵鑫宇3, 王鹤松4, 陈丙昊5, 石璨瑜1,2   

  1. 1.中国科学院西北生态环境资源研究院 奈曼沙漠化研究站,甘肃 兰州 730000
    2.中国科学院大学 资源与环境学院,北京 101408
    3.内蒙古农业大学 沙漠治理学院,内蒙古 呼和浩特 010018
    4.内蒙古民族大学 草业学院,内蒙古 通辽 028043
    5.内蒙古大学 生态与环境学院,内蒙古 呼和浩特 010020
  • 收稿日期:2025-04-02 修回日期:2025-06-24 出版日期:2025-07-20 发布日期:2025-08-18
  • 通讯作者: 罗亚勇
  • 作者简介:夏咪(2001—),女,河南南阳人,硕士研究生,研究方向为土壤生态学。E-mail: 3209056738@qq.com
  • 基金资助:
    国家自然科学基金项目(42275132);内蒙古自治区重点研发和成果转化计划项目(2022YFDZ0028);中国科学院“西部之光”人才培养引进计划项目

The impact of extreme drought on soil respiration in Caragana microphylla habitats in the Horqin Sandy Land

Mi Xia1,2(), Yayong Luo1,2(), Xinyu Zhao3, Hesong Wang4, Binghao Chen5, Canyu Shi1,2   

  1. 1.Naiman Desertification Research Station,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    2.College of Resources and Environment,University of Chinese Academy of Sciences,Beijing 101408,China
    3.College of Desert Control Science and Engineering,Inner Mongolia Agricultural University,Hohhot 010018,China
    4.College of Grassland Science,Inner Mongolia Minzu University,Tongliao 028043,Inner Mongolia,China
    5.School of Ecology and Environment,Inner Mongolia University,Hohhot 010020,China
  • Received:2025-04-02 Revised:2025-06-24 Online:2025-07-20 Published:2025-08-18
  • Contact: Yayong Luo

摘要:

土壤呼吸是陆地生态系统碳循环的重要组成部分,研究极端干旱下科尔沁沙地土壤呼吸与环境因子的动态变化,以期揭示降水格局变化对小叶锦鸡儿灌丛土壤呼吸的影响。本研究基于2024年在科尔沁沙地腹地开展的野外控制试验,设置了自然降水、减雨50%、6月干旱、7月干旱和8月干旱5个水平。结果表明:生长季土壤呼吸速率均呈现先上升后下降的趋势;生长季长于1个月的持续干旱期间灌丛土壤呼吸显著降低,减雨50%对土壤呼吸速率有影响但不显著;土壤呼吸速率与土壤温度呈显著的指数关系,与土壤含水量线性关系不显著;土壤水热因子、植物特征和酶活性可解释土壤呼吸速率变异的48%,其中土壤水热因子对其有最高的独立解释力(37%)。

关键词: 极端干旱, 土壤呼吸, 科尔沁沙地, 小叶锦鸡儿

Abstract:

Soil respiration is a crucial component of the terrestrial ecosystem carbon cycle. This study investigated the dynamic changes in soil respiration and environmental factors under extreme drought conditions in the Horqin Sandy Land, aiming to reveal the impacts of precipitation pattern alterations on soil respiration in Caragana microphylla. Based on field control experiments conducted in 2024 in the hinterland of Horqin Sandy Land, five treatments were established: natural precipitation, 50% rainfall reduction, June drought, July drought, and August drought. The results showed that: The soil respiration rate during the growing season initially increased and then decreased; Continuous drought lasting over one month during the growing season significantly reduced soil respiration, while 50% rainfall reduction had non-significant effects; The soil respiration rate exhibited a significant exponential relationship with soil temperature, but showed no significant linear correlation with soil moisture content; Soil hydrothermal factors, plant characteristics, and enzyme activities collectively explained 48% of the variation in soil respiration rates, with soil hydrothermal factors demonstrating the highest independent explanatory power (37%). This study provides important scientific references for accurately estimating carbon emissions in Horqin Sandy Land under future precipitation change scenarios.

Key words: extreme drought, soil respiration, Horqin Sandy Land, Caragana microphylla

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