A Miscanthus plantation can be carbon neutral without increasing soil carbon stocks
A Miscanthus plantation can be carbon neutral without increasing soil carbon stocks
复制标题
芒草种植园可以在不增加土壤碳储量的情况下实现碳中和
DOI:
10.1111/gcbb.12397
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发表时间:
2016
期刊:
影响因子:
5.6
通讯作者:
Robertson A
中科院分区:
文献类型:
--
作者:
Robertson A
National governments and international organizations perceive bioenergy, from crops such asMiscanthus, to have an important role in mitigating greenhouse gas (GHG) emissions and combating climate change. In this research, we address three objectives aimed at reducing uncertainty regarding the climate change mitigation potential of commercialMiscanthusplantations in the United Kingdom: (i) to examine soil temperature and moisture as potential drivers of soil GHG emissions through four years of parallel measurements, (ii) to quantify carbon (C) dynamics associated with soil sequestration using regular measurements of topsoil (0–30 cm) C and the surface litter layer and (iii) to calculate a life cycle GHG budget using site‐specific measurements, enabling the GHG intensity ofMiscanthusused for electricity generation to be compared against coal and natural gas. Our results show that methane (CH4) and nitrous oxide (N2O) emissions contributed little to the overall GHG budget ofMiscanthus, while soil respiration offset 30% of the crop's net aboveground C uptake. Temperature sensitivity of soil respiration was highest during crop growth and lowest during winter months. We observed no significant change in topsoil C or nitrogen stocks following 7 years ofMiscanthuscultivation. The depth of litter did, however, increase significantly, stabilizing at approximately 7 tonnes dry biomass per hectare after 6 years. The cradle‐to‐farm gate GHG budget of this crop indicated a net removal of 24.5 t CO2‐eq ha−1yr−1from the atmosphere despite no detectable C sequestration in soils. When scaled up to consider the full life cycle,Miscanthusfared very well in comparison with coal and natural gas, suggesting considerable CO2offsetting per kWh generated. Although the comparison does not account for the land area requirements of the energy generated,Miscanthusused for electricity generation can make a significant contribution to climate change mitigation even when combusted in conventional steam turbine power plants.
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DOI:
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发表时间:
2011
期刊:
影响因子:
--
作者:
R. Rowe;J. Whitaker;P. Freer;J. Chapman;S. Ryder;K. Ludley;D. Howard;G. Taylor
通讯作者:
G. Taylor
DOI:
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发表时间:
2014
期刊:
影响因子:
--
作者:
P.;Pecivova;V.;Pavlinek;J.;Hrabe;S. Kracmar
通讯作者:
S. Kracmar
DOI:
--
发表时间:
2012
期刊:
影响因子:
--
作者:
J. Zimmermann;J. Dauber;Michael B. Jones
通讯作者:
Michael B. Jones
DOI:
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发表时间:
1997
期刊:
影响因子:
--
作者:
M. Sanderson;R. Egg;A. Wiselogel
通讯作者:
A. Wiselogel
影响因子:
5.6
作者:
Dondini, Marta;Hastings, Astley;Smith, Pete
通讯作者:
Smith, Pete