Soil carbon pools of six ecological regions of the United States
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ORIGINAL PAPER
Soil carbon pools of six ecological regions of the United States Amitava Chatterjee1
Received: 3 December 2018 / Accepted: 10 January 2019 Ó Northeast Forestry University 2019
Abstract Mineralisable soil organic carbon (SOC) pools vary with ecosystem type in response to changes in climate, vegetation and soil properties. Understanding the effect of climate and soil factors on SOC pools is critical for predicting change over time. Surface soil samples from six ecoregions of the United States were analyzed for permanganate oxidizable C (KMnO4-C) and mineralizable C pools. Variations of SOC ranged from 7.9 mg g-1 (Florida site) to 325 mg g-1 (Hawaii site). Mineralisable C pools and KMnO4-C were highest in soils from the Hawaii site. Mean annual precipitation explains SOC and resistant C pool variations. Clay content was related to mineralisable active C pools and bacterial abundance. Mean annual precipitation and clay content are potential variables for predicting changes in SOC pools at large spatial scales.
Project funding: This project was supported by the North Dakota Agricultural Experiment Station, North Dakota State University (FARG007858). The online version is available at https://www.springerlink.com Corresponding editor: Chai Ruihai. Disclaimer: The NEON data products are provided ‘‘As is’’, without warranty of any kind, express, or implied, including but not limited to the warranties of merchantability, fitness for a particular purpose, title and non-infringement. In no event shall the copyright holders or anyone distributing the NEON data products be liable for any damages or other liability, whether in contract, tort or otherwise, arising from, out of or in connection with NEON data products. & Amitava Chatterjee [email protected] 1
Department of Soil Science, North Dakota State University, Fargo, ND 58108-6050, USA
Keywords Permanganate oxidizable carbon (KMnO4-C) Resistant carbon pool Mean residence time Soil carbon pools United States
Introduction Over two-thirds of terrestrial carbon is stored belowground as soil organic carbon (SOC) and a significant portion is released back as atmospheric CO2 through soil metabolic activities (Hibbard et al. 2005; Doetterl et al. 2015). Estimates of mineralizable soil C pools and variations across different ecosystems are critical to understand climate feedback (Trumbore 1993). The distribution of mineralizable C pools across biomes is linked to complex interactions among precipitation and temperatures, landscape features (elevation and slope), soil properties (pH and organic matter), net primary productivity and microbial community composition (Rustad et al. 2000; Ryan and Law 2005). Soil respiration varies significantly among plant biomes, suggesting that vegetation may have significant control of soil respiration rates. Soil organic matter can be divided into different functional pools based on the relative ease of mineralization of a particular pool. Typically, SOC is composed of a small active C pool with a rapid mineral
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