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赵广,刘刚才,朱万泽.贡嘎山峨眉冷杉树干呼吸空间特征及其对温度的响应.生态学报,2018,(8).http://dx.doi.org/10.5846/stxb201705160912  
贡嘎山峨眉冷杉树干呼吸空间特征及其对温度的响应
Spatial variations in the stem CO2 efflux rate of Abies fabri and the response to temperature in the Gongga Mountains
投稿时间:2017-05-16  修订日期:2017-11-30
DOI: 10.5846/stxb201705160912
关键词峨眉冷杉  树干呼吸  空间变化  温度敏感系数(Q10)
Key WordsAbies fabri  stem CO2 efflux rate  spatial variations  temperature sensitive coefficient (Q10)
基金项目国家重点研发计划课题(2017YFC0505004);中国科学院成都山地所“一三五重点培育项目”;国家自然科学基金(41471232)
作者单位E-mail
赵广 中国科学院水利部成都山地灾害与环境研究所;中国科学院大学 majicwill@163.com 
刘刚才 中国科学院水利部成都山地灾害与环境研究所  
朱万泽 中国科学院水利部成都山地灾害与环境研究所 wzzhu@imde.ac.cn 
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摘要:
采用红外线气体分析仪-土壤呼吸气室水平测定法(HOSC)原位监测了贡嘎山东坡峨眉冷杉(Abies fabri)树干CO2释放速率(Es),分析了树干Es与树干温度(Tstem)的关系。贡嘎山峨眉冷杉树干Es和Tstem空间变化格局明显,不同测定高度树干温度为0.3m>1.3m>2.3m,以1.3m处Es最大;不同方向Es和Tstem均表现为南面>北面。生长季和非生长季的峨眉冷杉Es分别在0.51—0.99μmol m-2 s-1和0.14—0.22μmol m-2 s-1之间波动。峨眉冷杉树Es变化趋势和Tstem一致,二者具有显著的指数函数关系(P<0.01)。峨眉冷杉非生长季树干呼吸Q10显著高于生长季(P<0.01),其中生长季变幅在1.9—3.0之间,非生长季在4.6—6.8之间,暗示个体或群落水平树干CO2释放通量的估算应充分考虑树干Es空间特征和Q10变化。
Abstract:
As an important component of carbon budgets and net ecosystem CO2 exchange in forest ecosystems, stem CO2 efflux rate (Es) plays a crucial role in the global carbon balance. Investigation of spatial variations and the response of Es to temperature, are essential for improving the accuracy of Es estimates at individual and community levels. In this study, the horizontally oriented soil chamber (HOSC) technique was applied to measure the CO2 released by stems. We measured Es in situ in the Abies fabri forest on Gongga Mountain using IRGA with a Li-6400-09 from September to December 2014. Our objectives were to examine the spatial variations in Es of A. fabri and to explore the response of Es to stem temperature (T?stem). Two representative trees in an immature A. fabri forest stand were selected. An opaque PVC collar (10.7-cm inside diameter and 5-cm high) was cut to match the approximate curvature of the stem with the other end being cut flat. Then the custom-built PVC collar was fastened to the south of the stem at a height of 0.3, 1.3 and 2.3m and to the north at a height of 1.3m, with 100% silicone sealant 24h before the measurement was made. Loose bark and moss were carefully removed from the stem surface curved by the PVC collar using a hairbrush without damaging the underlying cambium before installing the PVC collars. Measurements were made over three cycles at each sampling point, every 2 h from 8:00 to 18:00 in the same day of every month. The A. fabri stem Es and T?stem showed an apparent spatial pattern. The T?stem at different heights ranked as follows: 0.3>1.3>2.3m with maximum Es appearing at 1.3m. The Es and T?stem on the south face of the stem were higher than that on the north. The monthly averages Es of the growing season (September and October) and the non-growing season (November and December) was 0.51—0.99 and 0.14—0.22μmol m-2 s-1, respectively. The trend in A. fabri stem Es was consistent with T?stem with a significantly exponential relationship observed. The temperature coefficient (Q10) during the non-growing season (4.6—6.8) was much higher than that in the growing season (1.9—3.0). It was concluded that spatial variations of Es and Q10 should be considered when estimating individual and community stem Es.
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