Seasonal drought effects on carbon sequestration of a mid-subtropical planted forest of southeastern China

Sun, Xiaomin; Wen, Xuefa; Yu, Guirui; Liu, Yunfen; Liu, Qijing

doi:10.1007/s11430-006-8310-6

Cited by 32 publications

(27 citation statements)

References 22 publications

(27 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, GPP declined during the summer depression period. Previous studies also reported that high temperatures and low soil water content might cause GPP to decline in this forest [64,65].…”

Section: Seasonal Patterns Of Bioclimatic Factors Productivity Primentioning

confidence: 56%

Ability of the Photochemical Reflectance Index to Track Light Use Efficiency for a Sub-Tropical Planted Coniferous Forest

Zhang

Chen

et al. 2015

Remote Sensing

View full text Add to dashboard Cite

Light use efficiency (LUE) models are widely used to estimate gross primary productivity (GPP), a dominant component of the terrestrial carbon cycle. Their outputs are very sensitive to LUE. Proper determination of this parameter is a prerequisite for LUE models to simulate GPP at regional and global scales. This study was devoted to investigating the ability of the photochemical reflectance index (PRI) to track LUE variations for a sub-tropical planted coniferous forest in southern China using tower-based PRI and GPP measurements over the period from day 101 to 275 in 2013. Both half-hourly PRI and LUE exhibited detectable diurnal and seasonal variations, and decreased with increases of vapor pressure deficit (VPD), air temperature (Ta), and photosynthetically active radiation (PAR). Generally, PRI is able to capture diurnal and seasonal changes in LUE. However, correlations of PRI with LUE varied dramatically throughout the growing season. The correlation was the strongest (R 2 = 0.6427, p < 0.001) in July and the poorest in May. Over the entire growing season, PRI relates better to LUE under clear or partially cloudy skies (clearness index, CI > 0.3) with moderate to high VPD (>20 hPa) and high temperatures (>31˝C). Overall, we found that PRI is most sensitive to variations in LUE under stressed conditions, and the sensitivity decreases as the growing conditions become favorable when atmosphere water vapor, temperature and soil moisture are near the optimum conditions.

show abstract

Section: Seasonal Patterns Of Bioclimatic Factors Productivity Primentioning

confidence: 56%

Ability of the Photochemical Reflectance Index to Track Light Use Efficiency for a Sub-Tropical Planted Coniferous Forest

Zhang

Chen

et al. 2015

Remote Sensing

View full text Add to dashboard Cite

show abstract

“…For instance, the severe drought (and heat) occurring in European countries in 2003 substantially reduced photosynthesis and respiration, GPP in particular [74] , resulting in an anomalous net C source (0.5 Pg C a −1 ) being equivalent to the 4-year net ecosystem C sequestration [75] . The water stress in the same year also reduced the C sink strength of a warm temperate coniferous forest in southern China [76] . However，Canadian studies reported that severe drought decreased both GPP and TER in an aspen forest, causing either little change or a subtle reduction in NEP [37,38] ; mild-to-moderate water stress decreased TER but had little effect on GPP, leading to an increase in NEP [38] .…”

Section: Interannual Variations Of Forest Carbon Fluxesmentioning

confidence: 95%

Spatio-temporal patterns of forest carbon dioxide exchange based on global eddy covariance measurements

Wang

2008

Sci. China Ser. D-Earth Sci.

Self Cite

View full text Add to dashboard Cite

Spatio-temporal patterns and driving mechanisms of forest carbon dioxide (CO 2 ) exchange are the key issues on terrestrial ecosystem carbon cycles, which are the basis for developing and validating ecosystem carbon cycle models, assessing and predicting the role of forests in global carbon balance. Eddy covariance (EC) technique, an important method for measuring energy and material exchanges between terrestrial ecosystems and the atmosphere, has made a great contribution to understanding CO 2 exchanges in the biosphere during the past decade. Here, we synthesized published EC flux measurements at various forest sites in the global network of eddy flux tower sites (FLUXNET) and regional flux networks. Our objective was to explore spatio-temporal patterns and driving factors on forest carbon fluxes, i.e. net ecosystem productivity (NEP), gross primary productivity (GPP) and total ecosystem respiration (TER). Globally, forest NEP exhibited a significant latitudinal pattern jointly controlled by GPP and TER. The NEP decreased in an order of warm temperate forest > cold temperate and tropical rain forests > boreal and subalpine forests. Mean annual temperature (MAT) made a greater contribution to forest carbon fluxes than sum of annual precipitation (SAP). As MAT increased, the GPP increased linearly, whereas the TER increased exponentially, resulting in the NEP decreasing beyond an MAT threshold of 20°C. The GPP, TER and NEP varied substantially when the SAP was less than 1500 mm, but tended to increase with increasing SAP. Temporal dynamics in forest carbon fluxes and determinants depended upon time scales. NEP showed a significant interannual variability mainly driven by climate fluctuations and different responses of the GPP and TER to environmental forcing. In a longer term, forest carbon fluxes had a significant age effect. The ecosystem was a net carbon source right after clearcutting, gradually switched to a net carbon sink when the relative stand age (i.e. ratio of actual stand age to the stand rotation age) approached 0.3, and maximized carbon sequestration capacity at pre-mature or mature stand stages. This temporal pattern of NEP was correlated with stand leaf area index and associated GPP. This study highlights the significance of spatio-temporal dynamics in the CO 2 exchange in forest carbon cycling studies. It is also suggested that in addition to forest biomes, interannual variations and stand age effects of forest carbon fluxes should be considered in the global carbon balance.net ecosystem exchange, net ecosystem productivity, gross primary productivity, total ecosystem respiration, eddy covariance, forest Terrestrial ecosystems play an important role in global carbon (C) cycle [1,2] , which are the determinant of interannual variations in atmospheric carbon dioxide (CO 2 ) concentration [3][4][5] . It is a key objective in global C cycling studies to explore spatio-temporal patterns of CO 2 exchange of terrestrial ecosystems-atmosphere and driving mechanisms [6,7] . The forest, the most importan...

show abstract

“…5o). The extremely hot and dry weather conditions in the 2003 summer and the effects on the ecosystem at QYZ have been found and described in detail in studies such as those by Sun et al (2006), Wen et al (2006), and Yu et al (2008).…”

Section: Meteorological Conditions and Gpp At Ground Observational Simentioning

confidence: 99%

Impact of meteorological anomalies in the 2003 summer on Gross Primary Productivity in East Asia

et al. 2010

View full text Add to dashboard Cite

Abstract. Northern Eurasia experienced anomalous weather conditions in the 2003 summer. We examined how forest ecosystems responded to the meteorological anomalies during the period using the dataset collected at flux monitoring sites in Asia, including a boreal forest in Mongolia, temperate forests in China and Japan, and a sub-tropical forest in China, as well as the dataset from satellite remote sensing. From July to August 2003, an active rain band stayed in the mid-latitude in East Asia for an unusually long period. Under the influence of the rain band, the Gross Primary Production (GPP), of temperate forests was 20-30% lower in the 2003 summer than in other years due to significant reduction in the Photosynthetic Photon Flux Density (PPFD). The GPP of a cool-temperate forest in the north of the rain band was slightly enhanced by the higher PPFD; however, the GPP of a sub-tropical forest located in the south of the rain band was reduced by drought stress due to extremely hot and dry conditions. The correlation coefficients for the year-to-year changes in the PPFD and GPP during mid-summer were calculated, and the spatial distribution was examined. The spatial pattern of the PPFD was calculated by satellite data, and that of the GPP was estimated by a regression-type model,Correspondence to: N. Saigusa (n.saigusa@nies.go.jp) which was trained and tested by ground observation data. The correlation was positive in the mid-and high-latitudes since light was an essential factor of the summer GPP. On the other hand, a negative correlation appeared in the lower latitudes, suggesting that the water limitation was much more important than the PPFD in the region. Our study illustrated that the integration of flux data from wide areas by combining satellite remote sensing data can help us gain an understanding of the ecosystem responses to large-scale meteorological phenomena.

show abstract

Seasonal drought effects on carbon sequestration of a mid-subtropical planted forest of southeastern China

Cited by 32 publications

References 22 publications

Ability of the Photochemical Reflectance Index to Track Light Use Efficiency for a Sub-Tropical Planted Coniferous Forest

Ability of the Photochemical Reflectance Index to Track Light Use Efficiency for a Sub-Tropical Planted Coniferous Forest

Spatio-temporal patterns of forest carbon dioxide exchange based on global eddy covariance measurements

Impact of meteorological anomalies in the 2003 summer on Gross Primary Productivity in East Asia

Contact Info

Product

Resources

About