-
Abstract
The carbon cycle of terrestrial ecosystems is an important scientific issue in global climate change re-
search. Plantation forest plays an important role in terrestrial carbon budget in China. In this study,
eddy covariance flux data measured at Xiaolangdi forest ecosystem research station (XLD) in 2007 and
2008 are used to analyze the seasonal variation and meteorological control of CO2 flux in a 30-yr-old mixed
plantation. The plantation forest mainly consists of Quercus variabilis, Platycladus orientalis, and Robinia
pseudoacacia. The results show that the seasonal variations of net ecosystem exchange of CO2 (NEE),
gross primary production (GPP), and ecosystem respiration (Re) display single-peak curves. The maximum
of carbon sequestration appears during May and June each year. The relative contribution of carbon re-
lease from ecosystem respiration to GPP varied slightly between 2007 and 2008. The relationship between
NEE and photosynthetic active radiation (Qp) accords with the rectangular hyperbola model on diurnal
scale, and shows a good linear correlation on monthly scale. The ecosystem photosynthetic parameters:
the maximum photosynthetic rate (Pmax), the ecosystem photosynthetic photonyield (α), and the daytime
ecosystem respiration (Rd) exhibit seasonal variations. Pmax reaches the maximum in August each year,
with small interannual di?erence. The interannual differences of α and Rd are obvious, which is attributed
to the changes of meteorological factors, such as solar radiation, vapor pressure deficit (D), precipitation,
etc. Parameters Re, GPP, and NEP (net ecosystem production) have obvious exponential relations with
temperature on monthly scale. There is a hysteresis in the response of GPP and NEP to temperature, i.e.,
the carbon sequestration is not the maximum when the temperature reaches the peak value. The Q10 values
were 1.37 and 1.45 in 2007 and 2008, respectively. On monthly scale, Re, GPP, and NEE increase as D
increases, but rise slowly and even decrease when D is higher than 1.5 kPa.
-
-
Citation
HUANG Hui, ZHANG Jinsong, MENG Ping, FU Yuling, ZHENG Ning, GAO Jun. 2011: Seasonal Variation and Meteorological Control of CO2 Flux in a Hilly Plantation in the Mountain Areas of North China. Journal of Meteorological Research, 25(2): 238-248. DOI: 10.1007/s13351-011-0030-y
HUANG Hui, ZHANG Jinsong, MENG Ping, FU Yuling, ZHENG Ning, GAO Jun. 2011: Seasonal Variation and Meteorological Control of CO2 Flux in a Hilly Plantation in the Mountain Areas of North China. Journal of Meteorological Research, 25(2): 238-248. DOI: 10.1007/s13351-011-0030-y
|
HUANG Hui, ZHANG Jinsong, MENG Ping, FU Yuling, ZHENG Ning, GAO Jun. 2011: Seasonal Variation and Meteorological Control of CO2 Flux in a Hilly Plantation in the Mountain Areas of North China. Journal of Meteorological Research, 25(2): 238-248. DOI: 10.1007/s13351-011-0030-y
HUANG Hui, ZHANG Jinsong, MENG Ping, FU Yuling, ZHENG Ning, GAO Jun. 2011: Seasonal Variation and Meteorological Control of CO2 Flux in a Hilly Plantation in the Mountain Areas of North China. Journal of Meteorological Research, 25(2): 238-248. DOI: 10.1007/s13351-011-0030-y
|
Export: BibTex EndNote
Article Metrics
Article views:
PDF downloads:
Cited by: