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 CO_2 efflux rate of Abies fabri and the response to temperature in the Gongga Mountains
查看参考文献62篇
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文摘
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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CO_2释放速率(E_s),分析了树干E_s与树干温度(T_(stem))的关系.贡嘎山峨眉冷杉树干E_s和T_(stem)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E_s最大;不同方向E_s和T_(stem)均表现为南面>北面.生长季和非生长季的峨眉冷杉E_s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E_s变化趋势和T_(stem)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Q_(10)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CO_2释放通量的估算应充分考虑树干E_s空间特征和Q_(10)变化. |
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其他语种文摘
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As an important component of carbon budgets and net ecosystem CO_2 exchange in forest ecosystems,stem CO_2 efflux rate (E_s) plays a crucial role in the global carbon balance. Investigation of spatial variations and the response of E_s to temperature,are essential for improving the accuracy of E_s estimates at individual and community levels. In this study,the horizontally oriented soil chamber (HOSC) technique was applied to measure the CO_2 released by stems. We measured E_s 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 (10.7cm inside diameter and 5cm 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 2h from 8:00 to 18:00 in the same day of every month. The A. fabri stem E_s 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 E_s appearing at 1.3m. The E_s and T_(stem) on the south face of the stem were higher than that on the north. The monthly averages E_s 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 E_s was consistent with T_(stem) with a significantly exponential relationship observed. The temperature coefficient (Q_(10)) during the nongrowing 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 E_s and Q_(10) should be considered when estimating individual and community stem E_s. |
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来源
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生态学报
,2018,38(8):2732-2742 【核心库】
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DOI
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10.5846/stxb201705160912
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关键词
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峨眉冷杉
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树干呼吸
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空间变化
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温度敏感系数(Q_(10))
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地址
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1.
中国科学院水利部成都山地灾害与环境研究所, 成都, 610041
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中国科学院大学, 北京, 100049
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-0933 |
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学科
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林业 |
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基金
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国家重点研发计划课题
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中国科学院成都山地所“一三五重点培育项目”
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国家自然科学基金项目
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文献收藏号
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CSCD:6232297
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