Annual ecosystem respiration variability of alpine peatland on the eastern Qinghai-Tibet Plateau and its controlling factors
Annual ecosystem respiration variability of alpine peatland on the eastern Qinghai-Tibet Plateau and its controlling factors
复制标题
青藏高原东部高山泥炭地生态系统呼吸年变化及其控制因素
DOI：
10.1007/s10661-015-4733-x
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发表时间：
2015
影响因子：
3
通讯作者：
Wang Yu
中科院分区：
文献类型：
--
作者：
Peng Haijun;Hong Bing;Hong Yetang;Zhu Yongxuan;Cai Chen;Yuan Lingui;Wang Yu
年生态系统呼吸测量结果显示出典型的季节性模式，峰值出现在6月。呼吸最高为10.43 μmol CO2/m2/s，最低为0.20 μmol CO2/m2/s。年平均生态系统呼吸量为2.06 μmol CO2/m2/s。年呼吸总量为599.98 g C/m2，生长期（5 ~ 9月）的呼吸量占年总呼吸量的78%。非线性回归表明，生态系统呼吸与土壤温度在10 cm深度呈显著的指数相关（R2= 0.98）。q10值为3.90，远高于陆地生态系统的平均q10值。生态系统呼吸在生长季节具有明显的日变化规律，高峰和低谷分别出现在约14:00和10:00，这可能与土壤温度和土壤含水量在10 cm深度的变化有关。
Peatlands are widely developed in the eastern Qinghai–Tibet Plateau, but little is known about carbon budgets for these alpine peatland ecosystems. In this study, we used an automatic chamber system to measure ecosystem respiration in the Hongyuan peatland, which is located in the eastern Qinghai–Tibet Plateau. Annual ecosystem respiration measurements showed a typical seasonal pattern, with the peak appearing in June. The highest respiration was 10.43 μmol CO2/m2/s, and the lowest was 0.20 μmol CO2/m2/s. The annual average ecosystem respiration was 2.06 μmol CO2/m2/s. The total annual respiration was 599.98 g C/m2, and respiration during the growing season (from May to September) accounted for 78 % of the annual sum. Nonlinear regression revealed that ecosystem respiration has a significant exponential correlation with soil temperature at 10-cm depth (R2= 0.98). TheQ10value was 3.90, which is far higher than the averageQ10value of terrestrial ecosystems. Ecosystem respiration had an apparent diurnal variation pattern in growing season, with peaks and valleys appearing at approximately 14:00 and 10:00, respectively, which could be explained by soil temperature and soil water content variation at 10-cm depth.