Ecosystem respiration and its controlling factors in a coniferous and broad-leaved mixed forest in Dinghushan, China

摘要: Abstract Accurate estimation of ecosystem respiration (Reco) in forest ecosystems is critical for validating terrestrial carbon models. Continuous eddy covariance measurements Reco were conducted a coniferous and broad-leaved mixed located Dinghushan Nature Reserve southern China. was estimated the controlling environmental factors analyzed based on two years' data from 2003 to 2004. Major results included that: (1) affected by soil temperature, moisture, canopy air temperature humidity, where at 5 cm depth dominant factor. (2) The exponential equation, Van't Hoff Arrhenius equation Lyold-Talor can be used describe relationship between with similar statistical significance, while most sensitive index (Q10). (3) multiplicative model driven (Ts) moisture (Ms) more corresponsive Reco, which explained that there variations than both higher lower Ms. However, no difference (4) Annually accumulated as 1100–1135.6 gC m−2 a−1 using daytime data, 12%–25% (921–975 a−1) nighttime data. suggested estimate avoid common underestimation problem caused methods. study provides basic method further accurate net CO2 exchange (NEE)