Abstract：
:Accurately capturing dynamic soil response to disturbance effects in agroecosystem models remains elusive, thereby limiting projections of climate change mitigation potential. Perennial grasses cultivated in zero-tillage management systems hold promise as sustainable agroecosystems. High-yielding tropical C grasses often have extensive rooting systems, and the belowground processes of root turnover, aggregate formation, and mineral stabilization drove rapid C accumulation after cultivation in a recent study. We sought (i) to understand and constrain the size and responsiveness of dynamic, intermediate-cycling C pools contributing to the observed C accrual rates, and (ii) to simulate C stocks over time under the disturbance of elevated temperature using soil incubation at multiple temperatures and physical fractionation via density and sonication. Three-pool transfer modeling of soil incubations revealed small pools of readily available (i.e., days to months) microbial substrate that were responsive to temperature, time since cultivation, and inputs. Larger, kinetically slow-cycling pools were more indicative of long-term (i.e., years to decades) changes in C stock and strongly connected to measured changes in physical fractions. Combining the sensitivity of readily available microbial substrate with three-pool transfer modeling of the physical fractions over time since cultivation revealed that dynamic transfers of inputs occurred between the free organic and aggregate-protected fractions, and from these fractions to the mineral-associated dense fraction. Under 5°C temperature elevation, increased transfer rates outweighed elevated decomposition losses to sustain soil C accrual into the future. To effectively plan managed landscapes and monitor sustainable agroecosystems for climate change mitigation, tools must incorporate the complexity of soil response to change.
journal_name
J Environ Qualjournal_title
Journal of environmental qualityauthors
Crow SE,Sierra CAdoi
10.2134/jeq2017.07.0280subject
Has Abstractpub_date
2018-07-01 00:00:00pages
607-616issue
4eissn
0047-2425issn
1537-2537journal_volume
47pub_type
杂志文章abstract：:Agricultural nutrient management is an issue due to P loss from fields and water quality degradation. This is especially true in watersheds where a history of P application in excess of crop needs has resulted in elevated soil P (legacy P). As practices and policy are implemented in such watersheds to reduce P loss, i...
journal_title：Journal of environmental quality
pub_type： 杂志文章
doi：10.2134/jeq2017.12.0481
更新日期：2018-05-01 00:00:00
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journal_title：Journal of environmental quality
pub_type： 杂志文章
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journal_title：Journal of environmental quality
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doi：10.2134/jeq2004.0433
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journal_title：Journal of environmental quality
pub_type： 杂志文章
doi：10.2134/jeq2007.0371
更新日期：2008-09-01 00:00:00
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journal_title：Journal of environmental quality
pub_type： 杂志文章
doi：10.2134/jeq2015.09.0458
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journal_title：Journal of environmental quality
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journal_title：Journal of environmental quality
pub_type： 杂志文章
doi：10.2134/jeq2014.11.0463
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journal_title：Journal of environmental quality
pub_type： 杂志文章
doi：10.2134/jeq2016.03.0076
更新日期：2016-11-01 00:00:00
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journal_title：Journal of environmental quality
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journal_title：Journal of environmental quality
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doi：10.2134/jeq2016.10.0403
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journal_title：Journal of environmental quality
pub_type： 杂志文章
doi：10.1002/jeq2.20080
更新日期：2020-07-01 00:00:00
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journal_title：Journal of environmental quality
pub_type： 杂志文章
doi：10.2134/jeq2017.10.0406
更新日期：2018-01-01 00:00:00
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journal_title：Journal of environmental quality
pub_type： 杂志文章
doi：10.1002/jeq2.20184
更新日期：2020-12-10 00:00:00
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journal_title：Journal of environmental quality
pub_type： 杂志文章
doi：10.2134/jeq2002.1809
更新日期：2002-11-01 00:00:00
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journal_title：Journal of environmental quality
pub_type： 杂志文章
doi：10.2134/jeq2004.0299
更新日期：2005-04-20 00:00:00
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journal_title：Journal of environmental quality
pub_type： 杂志文章
doi：10.2134/jeq2006.0502
更新日期：2007-07-17 00:00:00
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journal_title：Journal of environmental quality
pub_type： 杂志文章
doi：10.2134/jeq2004.0454
更新日期：2005-08-09 00:00:00
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journal_title：Journal of environmental quality
pub_type： 杂志文章
doi：10.2134/jeq2010.0524
更新日期：2011-07-01 00:00:00
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journal_title：Journal of environmental quality
pub_type： 杂志文章
doi：10.2134/jeq2011.0284
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journal_title：Journal of environmental quality
pub_type： 杂志文章
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journal_title：Journal of environmental quality
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journal_title：Journal of environmental quality
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更新日期：2002-11-01 00:00:00
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journal_title：Journal of environmental quality
pub_type： 杂志文章
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更新日期：2018-05-01 00:00:00
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journal_title：Journal of environmental quality
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journal_title：Journal of environmental quality
pub_type： 杂志文章
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journal_title：Journal of environmental quality
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journal_title：Journal of environmental quality
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journal_title：Journal of environmental quality
pub_type： 杂志文章
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更新日期：2010-11-01 00:00:00
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journal_title：Journal of environmental quality
pub_type： 杂志文章
doi：10.2134/jeq2003.9960
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