Interannual Variability in Terrestrial Net Primary Production: Exploration of Trends and Controls on Regional to Global Scales

Ecosystems ◽  
1999 ◽  
Vol 2 (1) ◽  
pp. 36-48 ◽  
Author(s):  
Christopher S. Potter ◽  
Steven Klooster ◽  
Vanessa Brooks
Keyword(s):  
Primary Production ◽  
Interannual Variability ◽  
Net Primary Production

scholarly journals Drought dominates the interannual variability in global terrestrial net primary production by controlling semi-arid ecosystems

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Ling Huang ◽  
Bin He ◽  
Aifang Chen ◽  
Haiyan Wang ◽  
Junjie Liu ◽  
...  
Keyword(s):  
Primary Production ◽  
Interannual Variability ◽  
Southern Hemisphere ◽  
Interannual Variation ◽  
Net Primary Production ◽  
Arid Ecosystems ◽  
Leading Role ◽  
Main Driver ◽  
Semi Arid

Abstract Drought is a main driver of interannual variation in global terrestrial net primary production. However, how and to what extent drought impacts global NPP variability is unclear. Based on the multi-timescale drought index SPEI and a satellite-based annual global terrestrial NPP dataset, we observed a robust relationship between drought and NPP in both hemispheres. In the Northern Hemisphere, the annual NPP trend is driven by 19-month drought variation, whereas that in the Southern Hemisphere is driven by 16-month drought variation. Drought-dominated NPP, which mainly occurs in semi-arid ecosystems, explains 29% of the interannual variation in global NPP, despite its 16% contribution to total global NPP. More surprisingly, drought prone ecosystems in the Southern Hemisphere, which only account for 7% of the total global NPP, contribute to 33% of the interannual variation in global NPP. Our observations support the leading role of semi-arid ecosystems in interannual variability in global NPP and highlight the great impacts of long-term drought on the global carbon cycle.

scholarly journals Carbon allocation to biomass production of leaves, fruits and woody organs at seasonal and annual scale in a deciduous- and evergreen temperate forest

2010 ◽  
Vol 7 (5) ◽  
pp. 7575-7606 ◽  
Author(s):  
M. Campioli ◽  
B. Gielen ◽  
A. Granier ◽  
A. Verstraeten ◽  
J. Neirynck ◽  
...  
Keyword(s):  
Primary Production ◽  
Interannual Variability ◽  
Biomass Production ◽  
Residence Time ◽  
Forest Canopy ◽  
Net Primary Production ◽  
Gross Primary Production ◽  
Sink Strength ◽  
Early Season ◽  
Beech Stand

Abstract. Carbon taken up by the forest canopy is allocated to tree organs for biomass production and respiration. Because tree organs have different life span and decomposition rate, the tree C allocation determines the residence time of C in the ecosystem and its C cycling rate. The study of the carbon-use efficiency, or ratio between net primary production (NPP) and gross primary production (GPP), represents a convenient way to analyse the C allocation at the stand level. Previous studies mostly focused on comparison of the annual NPP-GPP ratio among forests of different functional types, biomes and age. In this study, we extend the current knowledge by assessing (i) the annual NPP-GPP ratio and its interannual variability (for five years) for five tree organs (leaves, fruits, branches, stem and coarse roots), and (ii) the seasonal dynamic of NPP-GPP ratio of leaves and stems, for two stands dominated by European beech and Scots pine. The average NPP-GPP ratio for the beech stand (38%) was similar to previous estimates for temperate deciduous forests, whereas the NPP-GPP ratio for the pine stand (17%) is the lowest recorded till now in the literature. The proportion of GPP allocated to leaf NPP was similar for both species, whereas beech allocated a remarkable larger proportion of GPP to wood NPP than pine (29% vs. 6%, respectively). The interannual variability of the NPP-GPP ratio for wood was substantially larger than the interannual variability of the NPP-GPP ratio for leaves, fruits and overall stand and it is likely to be controlled by previous year air temperature (both species), previous year drought intensity (beech) and thinning (pine). Seasonal pattern of NPP-GPP ratio greatly differed between beech and pine, with beech presenting the largest ratio in early season, and pine a more uniform ratio along the season. For beech, NPP-GPP ratio of leaves and stems peaked during the same period in the early season, whereas they peaked in opposite periods of the growing season for pine. Seasonal differences in C allocation are likely due to functional differences between deciduous and evergreen species and temporal variability of the sink strength. The similar GPP and autotrophic respiration between stands and the remarkable larger C allocation to wood at the beech stand indicate that at the beech ecosystem C has a longer residence time than at the pine ecosystem. Further research on belowground production and particularly on fine roots and ectomycorrhizal fungi likely represents the most important step to progress our knowledge on C allocation dynamics.

scholarly journals Temporal variability of the NPP-GPP ratio at seasonal and interannual time scales in a temperate beech forest

2011 ◽  
Vol 8 (9) ◽  
pp. 2481-2492 ◽  
Author(s):  
M. Campioli ◽  
B. Gielen ◽  
M. Göckede ◽  
D. Papale ◽  
O. Bouriaud ◽  
...  
Keyword(s):  
Primary Production ◽  
Interannual Variability ◽  
Temporal Variability ◽  
Current Knowledge ◽  
Net Primary Production ◽  
Gross Primary Production ◽  
Tree Canopy ◽  
Data Uncertainty ◽  
Severe Drought ◽  
Beech Stand

Abstract. The allocation of carbon (C) taken up by the tree canopy for respiration and production of tree organs with different construction and maintenance costs, life span and decomposition rate, crucially affects the residence time of C in forests and their C cycling rate. The carbon-use efficiency, or ratio between net primary production (NPP) and gross primary production (GPP), represents a convenient way to analyse the C allocation at the stand level. In this study, we extend the current knowledge on the NPP-GPP ratio in forests by assessing the temporal variability of the NPP-GPP ratio at interannual (for 8 years) and seasonal (for 1 year) scales for a young temperate beech stand, reporting dynamics for both leaves and woody organs, in particular stems. NPP was determined with biometric methods/litter traps, whereas the GPP was estimated via the eddy covariance micrometeorological technique. The interannual variability of the proportion of C allocated to leaf NPP, wood NPP and leaf plus wood NPP (on average 11% yr−1, 29% yr−1 and 39% yr−1, respectively) was significant among years with up to 12% yr−1 variation in NPP-GPP ratio. Studies focusing on the comparison of NPP-GPP ratio among forests and models using fixed allocation schemes should take into account the possibility of such relevant interannual variability. Multiple linear regressions indicated that the NPP-GPP ratio of leaves and wood significantly correlated with environmental conditions. Previous year drought and air temperature explained about half of the NPP-GPP variability of leaves and wood, respectively, whereas the NPP-GPP ratio was not decreased by severe drought, with large NPP-GPP ratio on 2003 due mainly to low GPP. During the period between early May and mid June, the majority of GPP was allocated to leaf and stem NPP, whereas these sinks were of little importance later on. Improved estimation of seasonal GPP and of the contribution of previous-year reserves to stem growth, as well as reduction of data uncertainty, will be of relevance to increase the accuracy of the seasonal assessment of the NPP-GPP ratio in forests.

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