Variation of carbon use efficiency over ten years in a subtropical coniferous plantation in southeast China

Tang, Yakun; Chen, Yunming; Wen, Xuefa; Sun, Xiaomin; Wu, Xu; Wang, Huimin

doi:10.1016/j.ecoleng.2016.09.009

Cited by 18 publications

(25 citation statements)

References 61 publications

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“…The uncertainty assessment in each year was expressed as the percentage relative to carbon flux (Table ). The averaged uncertainties during 2013–2015 were 7.88 ± 1.34% (GEP), 12.19 ± 1.6% (NEP), and 13.06 ± 0.48% (RE), and smaller than the corresponding carbon flux of a subarctic fen ecosystem (Aurela et al., ) and a subtropical coniferous forest ecosystem (Tang et al., ).…”

Section: Methodsmentioning

confidence: 91%

“…During May–September, the average reliable daytime and nighttime carbon flux data coverage for 2012–2014 was 83.2 ± 7.6% and 35 ± 4.1%, respectively. The quality of the eddy covariance system was assessed by the energy balance ratio (EBR), calculated as (LE + H )/( R n − G ) (Tang et al., ; Wilson et al., 2002). LE is the latent heat flux (W/m 2 ), and H is the sensible heat flux (W/m 2 ).…”

Section: Methodsmentioning

confidence: 99%

“…The random error ( E r ) calculated through the modeled ( F mod ) and observed ( F obs ) half‐hour fluxes:

E_{normalr} = \sqrt{{false\sum}_{i = 1}^{n} {(F_{normalobs} - F_{normalmod})}^{2} / false(n (n - 1) false)}

, where n is the half‐hour carbon fluxes number. The selective systematic uncertainties were mainly caused by the selection of the u* limit (Aurela et al., ; Tang et al., ). The u* of 0.10, 0.21, and 0.30 m/s was used to test the uncertainties of nighttime carbon fluxes.…”

Section: Methodsmentioning

confidence: 99%

“…Precipitation in arid and semiarid ecosystems is highly variable and discontinuous, with periods of low water availability separated by episodic events (Zeppel, Macinnis‐Ng, Ford, & Eamus, ; Zhao & Liu, ). The temporal variability of rainfall pulses, associated with the nonlinear responses of plants and soil microbes, constrains ecosystem carbon processes through the influence on water availability (Huxman et al., ; Tang et al., ). Climate change models indicate that the dynamics and distribution of rainfall will become more variable and exhibit greater influence on ecosystem carbon dynamics than other environmental variables (e.g., CO 2 concentration and temperature), although these models differ with changes in precipitation amount (Hao et al., ; Ryan et al., ).…”

Section: Introductionmentioning

confidence: 99%

“…Climate change models indicate that the dynamics and distribution of rainfall will become more variable and exhibit greater influence on ecosystem carbon dynamics than other environmental variables (e.g., CO 2 concentration and temperature), although these models differ with changes in precipitation amount (Hao et al., ; Ryan et al., ). Understanding the responses of carbon fluxes to rainfall pulses is essential for comprehending the carbon cycles in the context of climate change, especially in water‐limited ecosystems (Peng et al., ; Tang et al., ).…”

Section: Introductionmentioning

confidence: 99%

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Rainfall pulse response of carbon fluxes in a temperate grass ecosystem in the semiarid Loess Plateau

Tang

Jiang

Chen

et al. 2018

Ecology and Evolution

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Rainfall pulses can significantly influence carbon cycling in water‐limited ecosystems. The magnitude of carbon flux component responses to precipitation may vary depending on precipitation amount and antecedent soil moisture, associated with nonlinear responses of plants and soil microbes. The present study was carried out in a temperate grass ecosystem during 2013–2015 in the semiarid Loess Plateau of China, to examine the response of carbon fluxes to precipitation using the “threshold‐delay” model. The unique contribution of environmental variables such as precipitation amount and antecedent soil moisture before rainfall (SWC_antecedent) to carbon fluxes in response to rainfall was also investigated. The lower threshold of effective rainfall was 6.6 mm for gross ecosystem production (GEP), 8.5 mm for net ecosystem production (NEP), and 4.5 mm for ecosystem respiration (RE); and the upper threshold of effective rainfall was 21.4 mm for GEP and NEP, and 16.8 mm for RE. Rainfall amount was positively affected the relative rainfall responses of GEP, NEP, and RE. However, SWC_antecedent at 20 cm soil depth offset the response of GEP to rainfall pulses, and SWC_antecedent at 5 cm soil depth offset the response of NEP and RE to rainfall pulses, with corresponding partial slopes of linear regressions of −0.50, −0.40, and −0.52. These results indicated that NEP was more sensitive to rainfall pulses and RE was more sensitive to SWC_antecedent. These results demonstrate the importance of rainfall events of <10 mm and that the negative effect of SWC_antecedent should also be considered when estimating ecosystem carbon fluxes in this semiarid region.

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Section: Methodsmentioning

confidence: 91%

Section: Methodsmentioning

confidence: 99%

“…The random error ( E r ) calculated through the modeled ( F mod ) and observed ( F obs ) half‐hour fluxes:

E_{normalr} = \sqrt{{false\sum}_{i = 1}^{n} {(F_{normalobs} - F_{normalmod})}^{2} / false(n (n - 1) false)}

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Rainfall pulse response of carbon fluxes in a temperate grass ecosystem in the semiarid Loess Plateau

Tang

Jiang

Chen

et al. 2018

Ecology and Evolution

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Responses of soil respiration to rainfall depth and frequency in semiarid grassland communities

Xiong

Jia

et al. 2021

Ecohydrology

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Climate change is increasing the extreme precipitation depth and frequency, which may cause a strong response of ecological processes in drought regions. To investigate how rainfall depth and frequency alter soil respiration (SR), a rainfall simulation experiment was conducted in grassland communities dominated by Artemisia gmelinii and Lespedeza davurica in Loess Plateau of China. SR rate (R s ), soil temperature (T s ) and soil volumetric water content (S v ) were monitored before and after the rainfall treatments, that is, four depths (5, 10, 20 and 40 mm) and three frequencies (40 mm Â 1, 20 mm Â 2 and 10 mm Â 4) during the growing season (June to September). Results indicated that the response magnitude of R s increased with rainfall depths, reaching the maximum under 40 mm, and the increments were tightly related to rainfall frequency and community type. The increase and mean value of R s in A. gmelinii community were significantly higher than those in L. davurica and bare land under same rainfall depth. L. davurica community was more sensitive to rainfall lower than 10 mm, whereas it had weaker but longer response under rainfall larger than 10 mm compared with A. gmelinii community. Successive rainfall events dampened the pulse effect of R s but generated more cumulative CO 2 emission in vegetation communities. T s and S v varied significantly with rainfall depth and co-regulated SR. These findings implied more CO 2 will be released from soil in the semiarid grasslands under extreme and successive rainfalls and emphasized the importance of species impact on SR for soil carbon evaluation under future rainfall regimes.

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Water source partitioning and nitrogen facilitation promote coexistence of nitrogen-fixing and neighbor species in mixed plantations in the semiarid Loess Plateau

Tang

Chen

et al. 2019

Plant Soil

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Variation of carbon use efficiency over ten years in a subtropical coniferous plantation in southeast China

Cited by 18 publications

References 61 publications

Rainfall pulse response of carbon fluxes in a temperate grass ecosystem in the semiarid Loess Plateau

Rainfall pulse response of carbon fluxes in a temperate grass ecosystem in the semiarid Loess Plateau

Responses of soil respiration to rainfall depth and frequency in semiarid grassland communities

Water source partitioning and nitrogen facilitation promote coexistence of nitrogen-fixing and neighbor species in mixed plantations in the semiarid Loess Plateau

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