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生态学杂志 ›› 2020, Vol. 39 ›› Issue (12): 3952-3960.doi: 10.13292/j.1000-4890.202012.018

• 研究报告 • 上一篇    下一篇

五台山臭冷杉林土壤呼吸时空变化特征

田志杰1*,刘晓莹1,陈春兰1,胡砚秋1,郑庆荣1,高永平2   

  1. 1忻州师范学院, 山西忻州 034000;2山西臭冷杉自然保护区管理局, 山西忻州 034000)
  • 出版日期:2020-12-10 发布日期:2021-06-10

Temporal and spatial variations of soil respiration of Abies nephrolepis forest in Wutai Mountains.

TIAN Zhi-jie1*, LIU Xiao-ying1, CHEN Chun-lan1, HU Yan-qiu1, ZHENG Qing-rong1, GAO Yong-ping2   

  1. (1Xinzhou Teachers University, Xinzhou 034000, Shanxi, China; 2Shanxi Provincial Nature Reserve of Abies nephrolepis, Xinzhou 034000, Shanxi, China).
  • Online:2020-12-10 Published:2021-06-10

摘要: 土壤呼吸是气候变化背景下森林生态系统稳定性的重要评价指标。本研究以五台山臭冷杉森林群落为对象,对不同海拔(2100、2200、2300 m)典型群落土壤理化性质及主要生长季土壤呼吸速率、土壤水热条件变化进行分析,并建立回归模型解析土壤温度、湿度与土壤呼吸速率变化的关系。结果表明:臭冷杉森林土壤为中性偏酸性,随海拔上升,土壤pH、有机碳、总氮、总磷、速效磷含量和土壤湿度增加,土壤温度和土壤呼吸速率降低;7—10月,臭冷杉森林土壤温度和土壤呼吸速率逐渐降低,降幅分别为49.0%和64.9%,土壤湿度增加11.7%;土壤温度平均解释土壤呼吸速率变化的76.9%(P<0.001),且随海拔升高相关系数(R2)减小、温度敏感性增加(Q10),土壤湿度平均解释土壤呼吸速率变化的25.8%(P<0.001),二者共同解释土壤呼吸速率变化的71.2%(P<0.001)。本实验中,季节和海拔造成的土壤温度改变是影响土壤呼吸的主要因素,土壤湿度对土壤呼吸的影响较小。此外,土壤养分与土壤呼吸速率的RDA分析结果表明,土壤有机碳、总氮、总磷和速效磷含量是影响土壤呼吸速率的主要养分因子

关键词: 海拔, 土壤温度, 土壤湿度, 土壤呼吸速率, 温度敏感性

Abstract: Soil respiration is an important index evaluating ecosystem stability of forests in the context of climate change. In this study, we analyzed soil physical and chemical properties, soil respiration rate in main growing seasons, and changes in soil water and heat conditions in Abies nephrolepis forests at different altitudes (2100, 2200 and 2300 m) in Wutai Mountains. Regression models were established to analyze the relationship between soil temperature, moisture and soil respiration rate. The results showed that A. nephrolepis forest soil was neutral and acidic. With increasing altitude, soil pH, organic carbon, total nitrogen, total phosphorus, available phosphorus content and soil moisture increased, while soil temperature and soil respiration ratedecreased. From July to October, soil temperature and soil respiration rate decreased by 49.0% and 64.9%, respectively, while soil moisture increased by 11.7%. Soil temperature and soil moisture explained 76.9% (P<0.001) and 25.8% of the variation in soil respiration rate, respectively, which together explained 71.2% of variation in soil respiration rate (P<0.001). Therefore, soil temperature was the main factor affecting soil respiration ofA. nephrolepisforest in Wutai Mountains, while soil moisture played a minor role. The results of RDA analysis showed that soil organic carbon, total nitrogen content, total phosphorus content, and available phosphorus content were the main nutrient factors affecting soil respiration rate.

Key words: altitude, soil temperature, soil moisture, soil respiration rate, temperature sensitivity.