Decadal change of forest biomass carbon stocks and tree demography in the Delaware River Basin

Xu, Bing; Pan, Yude; Plante, Alain F.; Johnson, Arthur H.; Cole, Jason A.; Birdsey, Richard A.

doi:10.1016/j.foreco.2016.04.045

Cited by 27 publications

(21 citation statements)

References 56 publications

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“…Neither of these models accurately capture the dynamics of detritus resulting from tree and sapling mortality, which our study demonstrates is important in the decadal-scale reduction in NEP. More recently, parameterization of PnET-CN [12]) using extensive forest inventory data and tree mortality rates to explicitly simulate wood turnover in mid-Atlantic forests where oak mortality was significant resulted in relatively low estimates of annual NEP that are similar in magnitude to those measured in our study [12,77].…”

Section: Discussionsupporting

confidence: 49%

Decadal-Scale Reduction in Forest Net Ecosystem Production Following Insect Defoliation Contrasts with Short-Term Impacts of Prescribed Fires

Clark

Renninger

Skowronski

et al. 2018

Forests

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Understanding processes underlying forest carbon dynamics is essential for accurately predicting the outcomes of non-stand-replacing disturbance in intermediate-age forests. We quantified net ecosystem production (NEP), aboveground net primary production (ANPP), and the dynamics of major carbon (C) pools before and during the decade following invasive insect defoliation and prescribed fires in oak-and pine-dominated stands in the New Jersey Pinelands National Reserve, USA. Gross ecosystem production (GEP) recovered during the year following defoliation at the oak stand, but tree mortality increased standing dead and coarse woody debris, and ecosystem respiration (R e ) accounted for >97% of GEP. As a result, NEP averaged only 22% of pre-disturbance values during the decade following defoliation. At the pine stand, GEP also recovered to pre-disturbance values during the year following understory defoliation by gypsy moth and two prescribed fires, while R e was nearly unaffected. Overall, defoliation and tree mortality at the oak stand drove a decadal-scale reduction in NEP that was twofold greater in magnitude than C losses associated with prescribed fires at the pine stand. Our study documents the outcomes of different non-stand-replacing disturbances, and highlights the importance of detrital dynamics and increased R e in long-term measurements of forest C dynamics following disturbance in intermediate-age forests.

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Section: Discussionsupporting

confidence: 49%

Decadal-Scale Reduction in Forest Net Ecosystem Production Following Insect Defoliation Contrasts with Short-Term Impacts of Prescribed Fires

Clark

Renninger

Skowronski

et al. 2018

Forests

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“…The smaller observed wood turnover rates in all three vegetation types are very likely due to the forests in the DRB generally being in their mid‐ages, and subject to smaller mortality rates (Coomes and Allen , Xu et al. ). Our results showed that smaller wood turnover rates resulted in larger C accumulation in the live biomass C pool, but reduced the C stocks in soil.…”

Section: Discussionmentioning

confidence: 96%

“…Recent re‐measurements and data analysis of the CEMRI sites (Xu et al. ) provided a good opportunity to examine the PnET‐CN model performance outside its original range in the DRB landscapes along a gradient, and to explore approaches for parameterizing and improving the model using long‐term field measurements from multiple sites.…”

Section: Introductionmentioning

confidence: 99%

Modeling forest carbon cycle using long‐term carbon stock field measurement in the Delaware River Basin

Pan

Plante

et al. 2017

Ecosphere

Self Cite

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Abstract. Process-based models are a powerful approach to test our understanding of biogeochemical processes, to extrapolate ground survey data from limited plots to the landscape scale, and to simulate the effects of climate change, nitrogen deposition, elevated atmospheric CO 2 , increasing natural disturbances, and land-use change on ecological processes. However, in most studies, the models are calibrated using ground measurements from only a few sites, though they may be extrapolated to much larger areas. Estimation accuracy can be improved if the models are parameterized using long-term carbon (C) stock data from multiple sites representative of the simulated region. In this study, forest biomass C stocks measured in 61 forested plots located in three research sites in the Delaware River Basin (DRB) were used to modify the PnET-CN model in three ways: (1) Field-measured mortality rates in each forest type were used to parameterize the wood turnover rate; (2) a numerical approach was used to calibrate the relationship between foliage N and maximum photosynthesis rate; and (3) stand age was incorporated into the model as an input variable, which determines the year of the last disturbance. The results showed that these model modifications improved model performance in capturing the spatial variation of forest C dynamics in the DRB forests. The spatial distribution of forest C pools and fluxes in the three sites was mapped using the modified model. The modified model was also used in experimental scenarios, which predicted that 39% of forest C sequestered over the past decade could be attributed to the combined effects of elevated CO 2 and N deposition. This study demonstrated an effective method for using long-term biometric measurements of forest biomass C stocks to constrain and improve a process-based ecosystem model at a regional scale. Further research should target improving model parameters that are sensitive to the spatial variation of forest C dynamics.

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“…Forests play an important role in the global terrestrial carbon cycle; their potential to sequester additional atmospheric carbon dioxide (CO 2 ) is considered a mitigation strategy to reduce global climate warming [1][2][3][4][5][6]. Carbon dynamics in forests have received substantial attention from ecologists and governments [7,8].…”

Section: Introductionmentioning

confidence: 99%

Temporal Change in Aboveground Culms Carbon Stocks in the Moso Bamboo Forests and Its Driving Factors in Zhejiang Province, China

Shi

Zhou

et al. 2017

Forests

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Moso bamboo (Phyllostachys pubescens) has high carbon sequestration potential and plays an important role in terrestrial carbon cycling. Quantifying the temporal change in Moso bamboo forest carbon stocks is important for understanding forest dynamics and global climate change feedback capacity. In 2009, 168 Moso bamboo forest sample plots were established in Zhejiang Province using National Forest Continuous Inventory protocols and enhanced measurements. These plots were revisited and remeasured in 2014. By comparing the two years, culms number in age classes 2 and 4 increased by 12.3% and 82.5%, respectively, while that in age classes 1 and 3 decreased by 14.7% and 0.03%, respectively. The total aboveground culms carbon stocks increased by 2.95 Mg C ha −1 in the sample plots. On average, age classes 2 and 4 contributed 25.5% and 86.7% of the change in total carbon stocks, respectively. The carbon sequestrated by aboveground culms was 0.42 Tg C year −1 , accounting for 1.55 Tg CO 2 year −1 in Moso bamboo over an area of 0.78 million hectares in Zhejiang Province. The change in Moso bamboo carbon stocks did not correlate with environmental factors, but significantly increased with increasing culms number and average diameter at breast height (DBH). Our study helps contribute to improvements in Moso bamboo forest management strategies and promote carbon sequestration capacity.

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Decadal change of forest biomass carbon stocks and tree demography in the Delaware River Basin

Cited by 27 publications

References 56 publications

Decadal-Scale Reduction in Forest Net Ecosystem Production Following Insect Defoliation Contrasts with Short-Term Impacts of Prescribed Fires

Decadal-Scale Reduction in Forest Net Ecosystem Production Following Insect Defoliation Contrasts with Short-Term Impacts of Prescribed Fires

Modeling forest carbon cycle using long‐term carbon stock field measurement in the Delaware River Basin

Temporal Change in Aboveground Culms Carbon Stocks in the Moso Bamboo Forests and Its Driving Factors in Zhejiang Province, China

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