Pei Zhi-Yong, Ouyang Hua, Zhou Cai-Ping, Xu Xing-Liang
The Administrative Center for China's Agenda 21, Beijing 100038, China.
J Integr Plant Biol. 2009 May;51(5):521-6. doi: 10.1111/j.1744-7909.2009.00813.x. Epub 2009 Mar 9.
Carbon fluxes were measured using a static chamber technique in an alpine steppe in the Qinghai-Tibet Plateau from July 2000 to July 2001. It was shown that carbon emissions decreased in autumn and increased in spring of the next year, with higher values in growth seasons than in winters. An exponential correlation (E(carbon)= 0.22(exp(0.09T) + ln(0.31P+ 1)), R(2)= 0.77, P < 0.001) was shown between carbon emissions and environmental factors such as temperature (T) and precipitation (P). Using the daily temperature (T) and total precipitation (R), annual carbon emission from soil to the atmosphere was estimated to be 79.6 g C/m(2), 46% of which was emitted by microbial respiration. Considering an average net primary production of 92.5 g C/m(2) per year within the 2 year experiment, alpine steppes can take up 55.9 g CO(2)-C/m(2) per year. This indicates that alpine steppes are a distinct carbon sink, although this carbon reservoir was quite small.
2000年7月至2001年7月期间，利用静态箱技术在青藏高原的一个高寒草原测定了碳通量。结果表明，秋季碳排放减少，次年春季增加，生长季的值高于冬季。碳排放与温度（T）和降水（P）等环境因子之间呈现指数相关性（E（碳）= 0.22（exp（0.09T）+ ln（0.31P + 1）），R² = 0.77，P < 0.001）。利用日温度（T）和总降水量（R），估计土壤向大气的年碳排放量为79.6 g C/m²，其中46% 由微生物呼吸排放。考虑到在为期2年的实验中平均每年净初级生产力为92.5 g C/m²，高寒草原每年可吸收55.9 g CO₂-C/m²。这表明高寒草原是一个独特的碳汇，尽管这个碳库相当小。
