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生态学杂志 ›› 2021, Vol. 40 ›› Issue (4): 1038-1048.doi: 10.13292/j.1000-4890.202104.026

• 研究报告 • 上一篇    下一篇

模拟增温对高寒灌丛生长季土壤呼吸的影响

刘美1,陈亚梅2,崔宁洁3,马志良2*   

  1. 1绵阳师范学院生态安全与保护四川省重点实验室, 四川绵阳 621000; 2西华师范大学生命科学学院, 四川南充 637009; 3四川省林业和草原调查规划院, 成都 610081)
  • 出版日期:2021-04-10 发布日期:2021-04-12

Effects of simulated warming on soil respiration in growing season in an alpine scrubland.

LIU Mei1, CHEN Ya-mei2, CUI Ning-jie3, MA Zhi-liang2*#br#   

  1. (1Ecological Security and Protection Key Laboratory of Sichuan Province, Mianyang Normal University, Mianyang 621000, Sichuan, China; 2College of Life Science, China West Normal University, Nanchong 637009, Sichuan, China; 3Sichuan Forestry and Grassland Inventory and Planning Institute, Chengdu 610081, Sichuan, China).
  • Online:2021-04-10 Published:2021-04-12

摘要: 以青藏高原东部窄叶鲜卑花高寒灌丛为对象,研究了高寒灌丛生长季土壤呼吸不同组分对开顶式生长室(OTC)模拟增温的响应。结果表明:模拟增温使窄叶鲜卑花高寒灌丛空气温度和土壤温度平均增加了0.6 ℃和1.2 ℃,使土壤水分含量显著降低了2.7个百分点;模拟增温在灌丛生长季分别使土壤总呼吸、异养呼吸、根源呼吸、细根呼吸和根际微生物呼吸速率显著增加了54.3%~99.2%、60.8%~80.3%、30.0%~165.0%、37.6%~110.1%和96.7%~215.3%;土壤酶活性、土壤温度和土壤pH是影响土壤呼吸各组分速率的主要因子,这些因子可以解释土壤呼吸速率49.2%以上的变异;土壤微生物生物量、土壤无机氮含量和土壤水分对土壤呼吸速率的影响不显著;根源呼吸和细根呼吸速率与细根生物量呈显著相关。全球气候变暖将通过改变植物、土壤生物与非生物环境因子显著促进青藏高原东部高寒灌丛生态系统土壤呼吸过程,从而加速土壤碳循环。

关键词: 高寒灌丛, 模拟增温, 土壤呼吸组分, 土壤碳循环

Abstract: An in situ opentop chamber (OTC) experiment was conducted to investigate the effects of climate warming on soil respiration in the growing season ofSibiraea angustata alpine scrubland on the eastern Qinghai-Tibet Plateau. The results showed that the simulated warming increased the average temperature of air and soil by 0.6 ℃ and 1.2 ℃, respectively, and decreased soil moisture by 2.7 percents. Simulated warming significantly increased the rates of total soil respiration and all its components. The rates of total soil respiration, heterotrophic respiration, rhizosphere respiration, fine root respiration and rhizomicrobial respiration were increased by 54.3%-99.2%, 60.8%-80.3%, 30.0%-165.0%, 37.6%-110.1% and 96.7%-215.3%, respectively. Soil enzyme activities, soil temperature and soil pH were the main contributors to the changes of the rates of soil respiration components, which explained more than 49.2% variations of soil respiration rates. There was no significant effect of soil microbial biomass, soil inorganic nitrogen content and soil moisture on the rates of soil respiration components. The rates of rhizosphere respiration and fine root respiration were positively correlated with fine root biomass. These results indicated that global climate warming could promote soil respiration of alpine scrub ecosystem on the eastern Qinghai-Tibet Plateau by changing biotic and abiotic factors, and thus accelerate soil carbon cycling.

Key words: alpine scrub, simulated warming, soil respiration component, soil carbon cycling.