文献类型：期刊文献

中文题名：温度和元素含量对流溪河2个树种粗木质残体呼吸季节动态的影响

英文题名：Effects of Temperature and Element Content on the Seasonal Dynamics of Coarse Woody Debris Respiration of 2 Tree Species in Liuxihe National Forest Park,Guangzhou

作者：慈航[1] 李兆佳[1] 周光益[1] 赵厚本[1] 邱治军[1] 杨乐苏[1]

第一作者：慈航

机构：[1]中国林业科学研究院热带林业研究所热带林业研究国家林业局重点实验室

年份：2018

卷号：31

期号：5

起止页码：74-81

中文期刊名：林业科学研究

外文期刊名：Forest Research

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；CSCD:【CSCD2017_2018】；

基金：广东省林业科技创新项目(2013KJCX018-01);国家自然基金(31170664);中央级公益性科研院所基本科研业务费专项(CAFYBB2017SY024;RITFYWZX201504);广州市林业和园林局科技专项

语种：中文

中文关键词：粗木质残体;呼吸;季节动态;温度;元素含量

外文关键词：coarse woody debris;respiration;seasonal dynamics;temperature;element content

分类号：S791

摘要：[目的]研究粗木质残体(CWD)呼吸释放CO_2速率(R_(CWD))的年季节动态特征与温度及元素含量的关系,为CWD呼吸的碳通量计算和碳库模型建立提供参考数据。[方法]采用红外气体分析法(Li-Cor 8100)对马尾松(Pinus massoniana Lamb.)和石栎(Lithocarpus glaber(Thunb.) Nakai)的CWD进行连续1年的呼吸测定,同时测定CWD初始元素含量,分析温度及元素含量对R_(CWD)年季节动态的影响。[结果]表明:R_(CWD)的动态特征与温度变化趋势一致,表现出明显的单峰曲线格局;在所测定的温度范围(14. 5～28. 5℃)内,R_(CWD)与温度呈显著正相关(p <0. 01),温度驱动着R_(CWD)动态变化的64. 0%86. 2%,温度可预测马尾松R_(CWD)的64. 0%75. 6%,可预测石栎R_(CWD)的69. 3%86. 2%,马尾松的R_(CWD)总体小于石栎的;马尾松的温度敏感系数Q10值(3. 05)显著低于石栎的Q10值(5. 05)。针叶树种马尾松CWD的初始C含量显著高于阔叶树种石栎,而初始N、P含量显著低于石栎; R_(CWD)与初始C含量、C/N和C/P呈负相关,相关系数R2分别是0. 383、0. 590和0. 546,与初始N含量成显著正相关,相关系数R2为0. 416,与初始P含量和N/P正相关但不显著,初始元素含量可以解释R_(CWD)变化的38. 3%59. 0%。[结论]温度和初始元素含量对R_(CWD)均有较好的解释作用,温度和初始C/N能解释R_(CWD)变化的50%以上,温度和初始元素含量显著影响CWD的呼吸或分解的整个动态过程。
[Objective]To study the effects of temperature and elemental content on annual seasonal dynamic of coarse woody debris（ CWD） respiration rate（ RCWD） and provide reference for calculating the carbon flux of CWD respiration and the establishment of carbon pool model. [Method]The RCWDof Pinus massoniana and Lithocarpus glaber were measured using an infrared gas exchange analyzer（ Li-Cor8100） and the CWD initial element content.The effect of temperature and element content on RCWDwere discussed. [Result]The dynamics of RCWDwere in accordance with the trend of seasonal temperature,which showed a distinct single peak curve pattern. Within the temperature range of 14. 5-28. 5℃ measured,the RCWDwas significant positively correlated with temperature（ p 0. 01）. The temperature can predict 64. 0%-75. 6% of P. massoniana RCWD,and 69. 3%-86. 2% of L. glaber RCWD.The Q10 of P. massoniana（ 3. 05） was significantly lower than that of L. glaber（ 5. 05）. The RCWDof P. massoniana was less than that of L. glaber,meanwhile the initial C content of P. massoniana was significantly higher than that of the L. glaber,and the initial N and P content was significantly lower than that of the L. glaber. RCWD was negatively correlated with initial C content,C/N and C/P,and the correlation coefficients R^2 were 0. 383,0. 590 and 0. 546 respectively. RCWDwas positively correlated with the initial N content,the correlation coefficient R^2 was 0. 416. But there was no significant correlation among RCWD,P content and N/P. These indicated that initial element content can explain the 38. 3%-59. 0% of the RCWDchanges. [Conclusion] The study showes that temperature and initial C/N can explain more than half RCWDchanges in what place. Temperature and initial element content significantly affect the whole process of CWD respiration or decomposition.