Respiration of downed logs in an old-growth temperate forest in north-eastern China
Respiration of downed logs in an old-growth temperate forest in north-eastern China
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中国东北温带古老森林中倒下原木的呼吸作用
DOI：
10.1080/02827581.2010.524166
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发表时间：
2010-10
影响因子：
1.8
通讯作者：
Guan, Dexin
中科院分区：
文献类型：
--
作者：
Wu, Jiabing;Zhang, Xinjian;Wang, Haolei;Sun, Jinwei;Guan, Dexin
摘要粗木质残体CO2通量是粗木质残体森林碳排放的重要来源。红松（Pinus koraiensis Sieb.）等Zucc。）和林登（Tilia amurensis Rupr.）采用密闭静态箱-气相色谱法研究了长白山地区温带古老林中的植物群落及其对气象因子的响应。在一年的时间尺度上，日呼吸速率（R log）变化超过两个数量级（8.7-252.3 mg Ckg−1），并与木材含水量和温度显著相关（p<0.05）。每个衰变类的温度依赖的经验指数模型解释了超过67%的观测到的R日志的变化。更多的腐烂木材有更大的含水量和孔隙空间比腐烂的木材，这些差异可能是负责腐烂类之间的呼吸速率观察到的差异。在这片古老的温带森林中，由于呼吸作用造成的年碳损失率估计为28.0±3.7 g Cm−2，仅占森林地表总碳损失的3%左右，但来自砍伐原木的净碳通量占净生态系统交换的15%。倒下的原木代表了一个小的，但大量的碳通量，预计将增加在未来几十年内在古老的森林。
Abstract Carbon dioxide (CO2) flux from coarse woody debris is an important source of carbon emission in forests with large amounts of coarse woody debris (CWD). Respiration from downed logs of Korean pine (Pinus koraiensis Sieb. et Zucc.) and Amur linden (Tilia amurensis Rupr.) and their response to meteorological factors were investigated using the closed static chamber–gas chromatography technique in an old-growth temperate forest in Changbai Mountain region, north-eastern China. On a yearly timescale, daily respiration rates (R log) varied over two orders of magnitude (8.7–252.3 mg Ckg−1), and were significantly correlated with wood water content and temperature (p<0.05). The temperature-dependent empirical exponential models for each decay class explained more than 67% of the observed variations in R log. More decayed wood had a greater water content and pore space than less decayed wood, and these differences were probably responsible for the observed difference in respiration rate among decay classes. The annual carbon loss rate due to respiration was estimated to be 28.0±3.7 g Cm−2, which contributed only about 3% of total carbon loss from forest floor, but net carbon flux from downed logs accounted for up to 15% of net ecosystem exchange in this old temperate forest. Downed logs represent a small, but substantial carbon flux that is expected to increase over the next several decades in old-growth forest.
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影响因子：
2.8
作者：
Black, K.;Bolger, T.;Osborne, B.
通讯作者：
Osborne, B.
影响因子：
6.9
作者：
C. Woodall;G. Liknes
通讯作者：
C. Woodall;G. Liknes
影响因子：
4.8
作者：
LAMBERT, RL;LANG, GE;REINERS, WA
通讯作者：
REINERS, WA
影响因子：
6.2
作者：
Jianwu Tang;P. Bolstad;A. Desai;Jonathan G Martin;B. Cook;K. Davis;Eileen V. Carey
通讯作者：
Jianwu Tang;P. Bolstad;A. Desai;Jonathan G Martin;B. Cook;K. Davis;Eileen V. Carey
影响因子：
4
作者：
Chambers, JQ;Schimel, JP;Nobre, AD
通讯作者：
Nobre, AD