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长白山高山苔原季节性雪斑土壤呼吸对温度响应的模拟研究
引用本文:刘琪璟,张国春,徐倩倩,王义东,王辉民.长白山高山苔原季节性雪斑土壤呼吸对温度响应的模拟研究[J].植物生态学报,2010,34(5):477-487.
作者姓名:刘琪璟  张国春  徐倩倩  王义东  王辉民
作者单位:北京林业大学林学院, 北京 100083; 中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室千烟洲生态站, 北京 100101
摘    要:利用LI-8100土壤呼吸测定系统,在室内控制温度条件下测定了长白山高山苔原季节性雪斑大白花地榆(Sanguisorba sitchensis(=S.stipulata))群落土壤呼吸对温度的响应过程,并根据野外连续测定的全年温度,估算了雪斑群落土壤呼吸的季节变化,同时模拟气温升高对土壤呼吸的影响。雪斑土壤温度全年大部分时间维持在0℃以上,极端温度变动幅度不超过20℃。模拟计算了10cm深土壤的呼吸强度,海拔2036m处为307.1gC·m–2·a–1,海拔2260m处的呼吸量为270.9gC·m–2·a–1。由于积雪时间长,冬季呼吸占很大比例,而且随着海拔的升高比例加大。从海拔2036m到2260m,积雪期土壤呼吸分别占全年的42.5%(125.4gC·m–2·a–1)和49.7%(128.7gC·m–2·a–1)。模拟气温升高1℃并假设积雪时间减少20天,冬天的呼吸量减少8%左右,但全年总呼吸量增加8%左右。升温后,平均增加的呼吸量为0.25gC·kg–1·a–1(或22.65gC·m–2·a–1),冬季呼吸量减少0.118gC·kg–1·season–1(或10.81gC·m–2·season–1)。

关 键 词:高山苔原  大白花地榆  雪斑  土壤温度  土壤呼吸
收稿时间:2009-05-14

Simulation of soil respiration in response to temperature under snowpacks in the Changbai Mountain, China
LIU Qi-Jing,ZHANG Guo-Chun,XU Qian-Qian,WANG Yi-Dong,WANG Hui-Min.Simulation of soil respiration in response to temperature under snowpacks in the Changbai Mountain, China[J].Acta Phytoecologica Sinica,2010,34(5):477-487.
Authors:LIU Qi-Jing  ZHANG Guo-Chun  XU Qian-Qian  WANG Yi-Dong  WANG Hui-Min
Institution:Department of Forest Sciences, Beijing Forestry University, Beijing 100083, China;
Qianyanzhou Ecological Station, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
Abstract:Aims The objective was to investigate the respiration rate of snowpack soil in relation to temperature in the al-pine tundra community of Sanguisorba sitchensis (= S. stipulata) in the Changbai Mountain, northeastern China. Methods Soil respiration under different temperatures was measured with an LI-8100 automated CO_2 flux sys-tem in the laboratory, and annual respiration was estimated based on current and presumed temperature scenarios. Important findings Soil temperature under snowpack most of the year was around or over 0 ℃, and the varia-tion was less than 20 ℃. Estimated respiration rates within 10 cm depth were 307.1 g C·m~(-2)·a~(-1) at 2 036 m elevation and 270.9 g C·m~(-2)·a~(-1) at 2 260 m. Because the snow cover was present for a long period, the length of which increased with elevation, winter respiration accounted for 42.5% at 2 036 m and 49.7% at 2 260 m. Under the sce-nario that the snow period decreases if annual temperature rises 1 ℃, annual respiration would increase by 8% or 0.25 g C·kg~(-1)·a~(-1) (22.65 g C·m~(-2)·a~(-1)), but winter respiration would decrease by 0.118 g C·kg~(-l)·a~(-1) (10.81 g C·m~(-2)·a~(-1)).
Keywords:alpine tundra  Sanguisorba sitchensis (= S  stipulata)  snowpack  soil temperature  soil respiration
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