Separation of soil respiration: a site-specific comparison of partition methods
Author:
Comeau Louis-Pierre,Lai Derrick Y. F.,Cui Jane Jinglan,Farmer Jenny
Abstract
Abstract. Without accurate data on soil heterotrophic respiration (Rh), assessments of
soil carbon (C) sequestration rate and C balance are challenging to produce.
Accordingly, it is essential to determine the contribution of the different
sources of the total soil CO2 efflux (Rs) in different ecosystems,
but to date, there are still many uncertainties and unknowns regarding the
soil respiration partitioning procedures currently available. This study
compared the suitability and relative accuracy of five different Rs
partitioning methods in a subtropical forest: (1) regression between root
biomass and CO2 efflux, (2) lab incubations with minimally
disturbed soil microcosm cores, (3) root exclusion bags with hand-sorted
roots, (4) root exclusion bags with intact soil blocks and (5) soil
δ13C–CO2 natural abundance. The relationship
between Rh and soil moisture and temperature was also investigated. A
qualitative evaluation table of the partition methods with five performance
parameters was produced. The Rs was measured weekly from 3 February to
19 April 2017 and found to average
6.1 ± 0.3 MgCha-1yr-1. During this period, the Rh
measured with the in situ mesh bags with intact soil blocks and hand-sorted
roots was estimated to contribute 49 ± 7 and 79 ± 3 % of
Rs,
respectively. The Rh percentages estimated with the root biomass regression,
microcosm incubation and δ13C–CO2 natural abundance
were 54 ± 41, 8–17 and 61 ± 39 %, respectively. Overall,
no systematically superior or inferior Rs partition method was found. The
paper discusses the strengths and weaknesses of each technique with the
conclusion that combining two or more methods optimizes Rh assessment
reliability.
Publisher
Copernicus GmbH
Reference52 articles.
1. Accoe, F., Boeckx, P., Van Cleemput, O., Hofman, G., Zhang, Y., Rong Hua,
L., and Guanxiong, C.: Evolution of the d13C Signature Related to Total
Carbon Contents and Carbon Decomposition Rate Constants in a Soil Profile
Under Grassland, Rapid Commun. Mass Spectrom., 16, 2184–2189,
https://doi.org/10.1002/rcm.767, 2002. 2. Arcand, M. M., Helgason, B. L., and Lemke, R. L.: Microbial crop residue
decomposition dynamics in organic and conventionally managed soils, Appl.
Soil Ecol., 107, 347–359, 2016. 3. Behera, N., Joshi, S. K., and Pati, D. P.: Root contribution to total soil
metabolism in a tropical forest soil from Orissa, India, Forest Ecol.
Manag., 36, 125–134, 1990. 4. Braig, E. and Tupek, B.: Separating soil respiration components with stable
isotopes: natural abundance and labelling approaches, IFOREST, 3, 92–94,
2010. 5. Carbone, M. S., Still, C. J., Ambrose, A. R, Dawson, T. E., Williams, A. P.,
Boot, C. M., Schaeffer, S. M., and Schimel, J. P.: Seasonal and episodic
moisture controls on plant and microbial contributions to soil respiration,
Oecologia, 167, 265–278, 2011.
Cited by
13 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|