Seasonal variation in the size-dependent respiration of mangroves Kandelia obovata
Seasonal variation in the size-dependent respiration of mangroves Kandelia obovata
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DOI：
10.3354/meps08505
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发表时间：
2010-01-01
影响因子：
2.5
通讯作者：
Hagihara, Akio
中科院分区：
文献类型：
--
作者：
Hogue, A. T. M. Rafiqul;Sharma, Sahadev;Hagihara, Akio
尽管红树林在碳循环和沿海生态方面具有潜在的重要性，但有关红树林呼吸的信息很少。对分布最北端的红树林倒卵叶树的地上夜间呼吸进行了全年逐月测量，以研究呼吸的大小依赖关系和季节变化。从完全封闭的郁闭林中选取了6株不同大小的样木。月平均气温下倒卵果树的呼吸强度(R)随质量(M)的增加而增大。这种趋势可以用幂函数r=Fm(H)来描述，其中f是倍增系数，h是标度指数。指数值在0.723到1.085之间。在凉爽的冬季(休眠季节)，h指数接近1.0，而在温暖的夏季(生长季)，h指数接近3/4。呼吸作用在小型乔木中的季节变化大于大型乔木。从冬季休眠季到夏季生长季，小型树的呼吸作用相对增加幅度大于大型树。根据资源收获和运输理论，解释了呼吸作用在两个季节之间的变化。建议将夏季呼吸分为生长和维持部分，以更好地了解呼吸对大小和温度的依赖。
Despite the potential importance of mangrove forests in carbon cycling and coastal ecology, information on mangrove respiration is scanty. Aboveground nighttime respiration of mangrove Kandelia obovata trees at the northernmost limit of their distribution was measured monthly throughout a year to investigate size-dependence and seasonal variation in respiration. Six sample trees of different sizes were selected from a completely closed canopy stand. Respiration rate (r) of K. obovata trees at a monthly mean temperature increased with increasing mass (m). This tendency was described by means of the power function r=fm(h), where f is the multiplying coefficient and h is the scaling exponent. The exponent values ranged from 0.723 to 1.085. In the cool winter (dormant season), the exponent h was close to 1.0, while in the warm summer (growing season) the exponent was closer to 3/4. Respiration varies more between seasons in small-sized trees than in large-sized trees. The relative increase in respiration from the winter dormant season to the summer growing season was large in the small-sized trees compared with that in the large-sized trees. The variation in respiration between the 2 seasons is explained on the basis of theories about resource harvesting and transport. Separation of summer respiration into growth and maintenance components is suggested to better understand the dependence of respiration on size and temperature.