RESPONSES OF SOIL RESPIRATION AND ITS TEMPERATURE SENSITIVITY TO SOIL TEMPERATURE VARIATION AND SIMULATED NITROGEN DEPOSITION IN SUBTROPICAL MIXED FOREST IN SOUTHWEST, CHINA

编号000390641900010

论文题名RESPONSES OF SOIL RESPIRATION AND ITS TEMPERATURE SENSITIVITY TO SOIL TEMPERATURE VARIATION AND SIMULATED NITROGEN DEPOSITION IN SUBTROPICAL MIXED FOREST IN SOUTHWEST, CHINA

著者 Yu， L Wang， YJ Wang， YQ Sun， SQ

著者单位 [Yu Lei] Chinese Acad Forestry Div Sci & Technol Management Beijing 100091 Peoples R China. [Yu Lei; Wang Yujie; Wang Yunqi; Sun Suqi] Beijing Forestry Univ Soil & Water Conservat Beijing Engn Res Ctr Beijing 100083 Peoples R China.

卷期2016,25(11)

年份2016

学科分类 Environmental Sciences & Ecology

母体文献FRESENIUS ENVIRONMENTAL BULLETIN

页码 4547-4560

关键词 mixed forest soil respiration N deposition soil temperature Q(10) CO2 EFFLUX CARBON-DIOXIDE HETEROTROPHIC COMPONENTS TEMPORAL VARIATIONS ATMOSPHERIC CO2 ORGANIC-MATTER PINE FORESTS BEECH FOREST VEGETATION ECOSYSTEMS

著者全称Yu， Lei Wang， Yujie Wang， Yunqi Sun， Suqi

论文摘要This paper investigated soil respiration and the variations in its sensitivity to temperature (Q(10)) at different temporal scale. The mechanisms of the response to T variation and different levels of N treatment were also investigated. Results indicated that: (1) diurnal variation of Rs exhibited a unimodal curve trend, with maximum and minimum at around 14:00 and 2:00, respectively, and soil respired much faster during daytime than nighttime; There was a clear monthly variation of Rs, with the three years all showing as similar pattern of a unimodal curve. Yearly variation of Rs was insignificant. (2) There was a significant correlation between Rs and T (p<0.05), and an exponential model was selected for use in this study. (3) Q(10s) had obvious unimodal monthly variation and significant negative correlation with T (p<0.05). T was the main factor driving variation in Q(10s). Differences in Q(10y) during these three years were not significant (p>0.05) and the maximum was in 2012 (1.95). There were significant differences in the comparisons between Q(10y) and the mean value of Q(10s) for each year. (4) Rs at diurnal and monthly scales were repressed after short-term N deposition, and the inhibiting effects were greater as N treatment levels increased. The mean values of Rs for CK and LN treatments showed no significant differences (p>0.05) while that for HN treatment was notably lower than for the CK. Q(10) values for the four N deposition levels were in the following order: CK (1.68)>LN (1.66)>MN (1.61) > HN (1.57).

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