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北京山区不同植被类型的土壤呼吸特征及其温度敏感性
引用本文:郑鹏飞,余新晓,贾国栋,李红娟,王渝淞,朱栩辉.北京山区不同植被类型的土壤呼吸特征及其温度敏感性[J].应用生态学报,2019,30(5):1726-1734.
作者姓名:郑鹏飞  余新晓  贾国栋  李红娟  王渝淞  朱栩辉
作者单位:1.北京林业大学水土保持国家林业和草原局重点实验室, 北京 100083;2.北京林业大学林业生态工程教育部工程研究中心, 北京 100083;3.北京澳作生态仪器有限公司, 北京 100095
基金项目:国家自然科学基金重点项目(41430747,41877152)和科技创新服务能力建设-协同创新中心-林果业生态环境功能提升协同创新中心(2011协同创新中心)(市级)项目(PXM2018_014207_000024)
摘    要:土壤呼吸作为陆地生态系统碳循环的重要组成部分,是生态系统碳循环研究中的热点问题.土壤呼吸温度敏感性(Q10)是估算土壤呼吸对全球变暖的反馈参数,研究不同植被类型的Q10对评估森林生态系统碳收支具有重要意义.本研究以北京山区典型植被类型侧柏、油松和栓皮栎为研究对象,通过测定生长季内3种植被类型的土壤理化性质、土壤水热因素以及土壤呼吸速率(Rs)的变化,探究不同植被类型下的土壤呼吸特征及温度敏感性.结果表明:3种主要植被类型的Rs在生长季内与土壤温度、湿度的变化趋势相似,均呈现先升高后降低的单峰变化,Rs在4月初最低(0.45 μmol·m-2·s-1),随后逐渐增大,在7月初达到峰值(3.95 μmol·m-2·s-1),然后逐渐降低,3种植被类型的RsQ10值均存在显著差异.土壤温度和湿度是土壤呼吸的重要影响因素,两者与Rs拟合的回归模型可以解析土壤呼吸速率48.1%~56.7%的变化.北京山区的Q10值在2.05~3.19,在同一植被类型下,Q10值与土壤有机碳含量呈显著负相关(R2>0.9),植被类型、海拔和土壤有机碳含量是造成不同植被类型Q10值差异的重要原因.

收稿时间:2018-11-23

Soil respiration and its temperature sensitivity among different vegetation types in Beijing mountain area,China.
ZHENG Peng-fei,YU Xin-xiao,JIA Guo-dong,LI Hong-Juan,WANG Yu-song,ZHU Xu-hui.Soil respiration and its temperature sensitivity among different vegetation types in Beijing mountain area,China.[J].Chinese Journal of Applied Ecology,2019,30(5):1726-1734.
Authors:ZHENG Peng-fei  YU Xin-xiao  JIA Guo-dong  LI Hong-Juan  WANG Yu-song  ZHU Xu-hui
Institution:;1.Key Laboratory of State Forestry and Grassland Administration on Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China;2.Ministry of Education Engineering Research Center of Forestry Ecological Engineering, Beijing Forestry University, Beijing 100083, China;3. Beijing Ao-zuo Ecological Instruments Co Ltd, Beijing 100095, China
Abstract:As an important component of terrestrial ecosystem carbon cycle, soil respiration is a hot topic in the studies of carbon cycle. The temperature sensitivity (Q10) of soil respiration is a critical index to estimate the effects of global warming on soil respiration. Understanding Q10 of different vegetation types is of important significance for assessing the carbon budget of forest ecosystems. We examined soil respiration and its temperature sensitivity in three typical forests (Pinus tabuliformis, Platycladus orientalis, and Quercus variabilis) in the Beijing mountainous area by measuring the soil physical and chemical properties, soil temperature, soil moisture, and soil respiration rate (Rs) during the growing season. The results showed that Rs of three typical vegetation types showed a similar trend with changes of soil temperature and humidity, which showed a unimodal pattern, with minimum value (0.45 μmol·m-2·s-1) in early April and maximum value (3.95 μmol·m-2·s-1) in early July. There were significant differences in Rs and Q10 values among the three vegetation types. Soil temperature and humidity were the important factors affecting soil respiration, together they could explain the seasonal variation of soil respiration rate from 48.1% to 56.7%. The range of Q10 value was between 2.05 and 3.19. There was a significant negative correlation between soil organic carbon content and Q10 under each vegetation type (R2>0.9). Vegetation type, elevation, and soil organic carbon content were important drivers for the variation of Q10.
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