What is NPP? Inconsistent accounting of respiratory fluxes in the definition of net primary production

Roxburgh, Stephen H.; Berry, Sandra L.; Buckley, Thomas N.; Barnes, Belinda; Roderick, Michael L.

doi:10.1111/j.1365-2435.2005.00983.x

Cited by 82 publications

(55 citation statements)

References 11 publications

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“…Net primary productivity (NPP), an indicator of the accumulation of atmospheric CO2 in terrestrial ecosystems, plays a crucial role in global change [54]. The accurate estimation of NPP is a crucial step for reliably quantifying carbon fluxes between the atmosphere and terrestrial ecosystems [31], especially for regions with different topography and climatic conditions.…”

Section: Uncertainties In Npp Estimatesmentioning

confidence: 99%

Nonlinear Variations of Net Primary Productivity and Its Relationship with Climate and Vegetation Phenology, China

Yang

Zhang

Luo

et al. 2017

Forests

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Net primary productivity (NPP) is an important component of the terrestrial carbon cycle. In this study, NPP was estimated based on two models and Moderate Resolution Imaging Spaectroradiometer (MODIS) data. The spatiotemporal patterns of NPP and the correlations with climate factors and vegetation phenology were then analyzed. Our results showed that NPP derived from MODIS performed well in China. Spatially, NPP decreased from the southeast toward the northwest. Temporally, NPP showed a nonlinear increasing trend at a national scale, but the magnitude became slow after 2004. At a regional scale, NPP in Northern China and the Tibetan Plateau showed a nonlinear increasing trend, while the NPP decreased in most areas of Southern China. The decreases in NPP were more than offset by the increases. At the biome level, all vegetation types displayed an increasing trend, except for shrub and evergreen broad forests (EBF). Moreover, a turning point year occurred for all vegetation types, except for EBF. Generally, climatic factors and Length of Season were all positively correlated with the NPP, while the relationships were much more diverse at a regional level. The direct effect of solar radiation on the NPP was larger (0.31) than precipitation (0.25) and temperature (0.07). Our results indicated that China could mitigate climate warming at a regional and/or global scale to some extent during the time period of 2001-2014.

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Section: Uncertainties In Npp Estimatesmentioning

confidence: 99%

Nonlinear Variations of Net Primary Productivity and Its Relationship with Climate and Vegetation Phenology, China

Yang

Zhang

Luo

et al. 2017

Forests

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“…Carbohydrate storage can complicate the determination of NPP because growth can include carbon that was fixed in a previous year (Gustafson, 1976;Roxburgh et al, 2005). Consequently, we calculated a conservative NPP by correcting NPP estimates for potential double counting of the starch reserve (S R ).…”

Section: Calculating Npp From Biomass Observationsmentioning

confidence: 99%

Why is marsh productivity so high? New insights from eddy covariance and biomass measurements in a Typha marsh

Rocha

Goulden

2009

Agricultural and Forest Meteorology

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“…At ecosystem scale, this process is called gross primary production (GPP) (Mäkelä et al 2008;Roxburgh et al 2005). The organic molecules, in their various forms, are subsequently oxidised during the process of respiration, releasing CO 2 , water and energy.…”

Section: Introductionmentioning

confidence: 99%

Determinants of soil respiration in a semi-arid savanna ecosystem, Kruger National Park, South Africa

Makhado¹,

Scholes²

2011

Koedoe

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Soil respiration, which is a combination of root respiration and microbial respiration, represents one of the main carbon fluxes in savannas. However, it is remarkable how little is known about these components – regarding either process-level mechanisms or quantitative estimates, especially in savanna ecosystems. Given the extensive area of savannas worldwide, this limits our ability to understand and predict the critical changes in the global carbon budget that underlie the phenomenon of global climate change. From May 2000 to April 2001, bi-weekly soil respiration measurements from two savanna types were made in 14 sampling collars (diameter = 100 mm), using a PP Systems EGM-2 respirometer. Results indicated that there was a difference in the rate of respiration between the more clayey Acacia and sandier Combretum savanna soils (p = 0.028). The mean (± s.d.) soil respiration in the Acacia savanna was 0.540 g/m2/h ± 0.419 g/m2/h, whilst it was 0.484 g/m2/h ± 0.383 g/m2/h in the Combretum savanna. We also found that soil respiration was sensitive to soil moisture and soil temperature. The rate of soil respiration at both sites rose to a maximum when soil temperature was at 28 °C and declined at higher temperatures, despite different temperature sensitivities. Soil respiration increased approximately linearly with an increase of soil moisture. In both savanna sites soil is subject to a combination of high temperature and water stress, which controls the fluxes of soil carbon dioxide. We found that the two sites differed significantly in their soil moisture characteristics (p < 0.0001) but not with regard to temperature (p = 0.141), which implies that soil moisture is the main factor responsible for the differences in respiration between Acacia and Combretum savannas.Conservation implications: It is argued for many protected areas that they perform a climate change buffering function. Knowing the soil respiration rate and determining its controlling factors contribute to improved understanding of whether protected areas will be net sources or sinks of carbon in the future.

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What is NPP? Inconsistent accounting of respiratory fluxes in the definition of net primary production

Cited by 82 publications

References 11 publications

Nonlinear Variations of Net Primary Productivity and Its Relationship with Climate and Vegetation Phenology, China

Nonlinear Variations of Net Primary Productivity and Its Relationship with Climate and Vegetation Phenology, China

Why is marsh productivity so high? New insights from eddy covariance and biomass measurements in a Typha marsh

Determinants of soil respiration in a semi-arid savanna ecosystem, Kruger National Park, South Africa

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