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Open AccessArticle

Relationship between Net Primary Productivity and Forest Stand Age under Different Site Conditions and Its Implications for Regional Carbon Cycle Study

1
Department of Forest Management, School of Forestry, Northeast Forestry University, Harbin 150040, China
2
Department of Geography, University of Toronto, Toronto, ON M5S 3G3, Canada
*
Author to whom correspondence should be addressed.
Forests 2018, 9(1), 5; https://doi.org/10.3390/f9010005
Received: 18 October 2017 / Revised: 5 December 2017 / Accepted: 13 December 2017 / Published: 16 January 2018
(This article belongs to the Section Forest Ecology and Management)
Net primary productivity (NPP) is a key component in the terrestrial ecosystem carbon cycle, and it varies according to stand age and site class index (SCI) for different forest types. Here we report an improved method for describing the relationships between NPP and stand age at various SCI values for the main forest types and groups in Heilongjiang Province, China, using existing yield tables, biomass equations, and forest inventory data. We calculated NPP as the sum of four components: Annual accumulation of live biomass, annual mortality of biomass, foliage turnover, and fine root turnover in soil. We also consider the NPP of understory vegetation or moss. These NPP-age relationships under different site conditions indicate that the NPP values of broadleaved and coniferous, as well as broadleaved mixed forests increase rapidly and reach a maximum when in young forests. However, for coniferous forest types, the maximum NPP generally occurs in mature forests. In addition, a higher SCI leads to a higher NPP value. Finally, we input these NPP-age relationships at various SCI values into the Integrated Terrestrial Ecosystem Carbon (InTEC) model to modify NPP modeling to estimate NPP in Heilongjiang Province in China from 2001 to 2010. All of the results showed that the methods reported in this study provide a reliable approach for estimating regional forest carbon budgets. View Full-Text
Keywords: net primary productivity; yield table; NPP-age relationships; site class index; C cycle model net primary productivity; yield table; NPP-age relationships; site class index; C cycle model
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MDPI and ACS Style

Wang, B.; Li, M.; Fan, W.; Yu, Y.; Chen, J.M. Relationship between Net Primary Productivity and Forest Stand Age under Different Site Conditions and Its Implications for Regional Carbon Cycle Study. Forests 2018, 9, 5. https://doi.org/10.3390/f9010005

AMA Style

Wang B, Li M, Fan W, Yu Y, Chen JM. Relationship between Net Primary Productivity and Forest Stand Age under Different Site Conditions and Its Implications for Regional Carbon Cycle Study. Forests. 2018; 9(1):5. https://doi.org/10.3390/f9010005

Chicago/Turabian Style

Wang, Bin; Li, Mingze; Fan, Wenyi; Yu, Ying; Chen, Jing M. 2018. "Relationship between Net Primary Productivity and Forest Stand Age under Different Site Conditions and Its Implications for Regional Carbon Cycle Study" Forests 9, no. 1: 5. https://doi.org/10.3390/f9010005

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