Summary
Net primary production (NPP) refers to the net amount of the carbon and energy fixed by green plants through photosynthetic activity. Estimates of NPP are of fundamental human importance, because food supply is predominantly dependent on plant productivity. Moreover, measurements of spatiotemporal variations of forest NPP provide important information for understanding and projecting the global carbon cycle, because forest ecosystems are a major terrestrial carbon sink. Here we discuss methods for estimating NPP in forest ecosystems using inventory data, and describe the “summation method”, which was developed in Japan in the 1960s at the International Biological Program (IBP) to facilitate standardization in the absence of complex instruments under field conditions. Global climate change prompted to development of this “summation method” as an improved “biometric method” in the 1990s. Biometric-based estimates of NPP are conceptually defined as the total amount of new organic matter produced during an interval per unit area at the ecosystem scale, and are expressed as the sum of stand increments of living biomass (SI), newly produced aboveground litter (L an ), and fine root production (P fr ). The SI of above- and belowground (coarse roots) biomass can be estimated by tracking the survival and diameter of individual tree stems in a permanent plot. Aboveground litter of short-lived organs (L an ), such as deciduous leaves, flowers, and fruits, can be determined using litter traps that are set on the forest floor. Although methods for determining P fr remain unstandardized, 1-year turnover of fine roots is often considered an estimate of fine root dynamics (P fr ≈ mean fine root biomass). In a study of the Takayama Experimental Forest, we demonstrated correlations of biometric-based NPP estimates with various methods, such as simulated canopy photosynthesis by scaling up leaf photosynthesis and incorporating values obtained using eddy covariance. The resulting biometric method has sufficient sensitivity to demonstrate climate-induced year-to-year variations of tree growth and allocation of carbon inputs by NPP in forest ecosystems.
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Abbreviations
- B :
-
Forest biomass
- B t1 :
-
Forest biomass at time t 1
- B t2 :
-
Forest biomass after an interval at time t 2
- B 2n :
-
The amount of new organic matter retained by live plants after an interval at time t 2
- BI s :
-
Biomass increments of surviving trees during an interval
- BI i :
-
Biomass increments of ingrowth trees during an interval
- D, DBH:
-
Diameter at breast height
- GPP:
-
Gross primary production
- IPCC:
-
Intergovernmental Panel of Climate Change
- IBP:
-
International Biological Program
- LAI :
-
Leaf area index
- L :
-
The amount of loss of organic matter from plant biomass during an interval
- L an :
-
The amount of aboveground plant litter produced and shed during an interval
- L n :
-
The amount of organic matter both produced and lost by plants during an interval
- L o :
-
The amount of loss of old plant biomass present at time t 1 during an interval
- M :
-
Necromass by tree mortality during an interval
- NEP:
-
Net ecosystem production
- NPP:
-
Net primary production
- P n :
-
The amount of organic matter newly produced during an interval
- P fr :
-
Fine root production
- RA:
-
Autotrophic respiration (plant respiration)
- RE:
-
Ecosystem respiration
- RH:
-
Heterotrophic respiration
- RHCWD :
-
Heterotrophic respiration that decomposed coarse woody debris
- RHSOM :
-
Heterotrophic respiration that decomposed litter and soil organic matter
- SI :
-
Stand increment of forest biomass
- V cmax :
-
Maximum velocity of carboxylation
- W :
-
Dry mass of tree
- W s :
-
Dry mass of tree stem
- ρ :
-
Species-specific stem wood density
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Acknowledgements
We thank K. Kurumado and Y. Miyamoto of the Takayama Field Station of Gifu University for their support of field. Thanks are also due to Drs. H. Kondo of AIST, W. Mo-Kishimoto of NIAES and M. Adachi of NIES. This study was supported by KAKENHI (JSPS, no. 21310009) to TO, JSPS-NRF-NSFC A3 Foresight Program and Research and Education Funding for JALPS (Japanese Alps Inter-University Cooperative Project), MEXT, Japan.
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Ohtsuka, T., Saigusa, N., Iimura, Y., Muraoka, H., Koizumi, H. (2016). Biometric-Based Estimations of Net Primary Production (NPP) in Forest Ecosystems. In: Hikosaka, K., Niinemets, Ü., Anten, N. (eds) Canopy Photosynthesis: From Basics to Applications. Advances in Photosynthesis and Respiration, vol 42. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-7291-4_12
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