2016
DOI: 10.1073/pnas.1516157113
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Photodegradation alleviates the lignin bottleneck for carbon turnover in terrestrial ecosystems

Abstract: A mechanistic understanding of the controls on carbon storage and losses is essential for our capacity to predict and mitigate human impacts on the global carbon cycle. Plant litter decomposition is an important first step for carbon and nutrient turnover, and litter inputs and losses are essential in determining soil organic matter pools and the carbon balance in terrestrial ecosystems. Photodegradation, the photochemical mineralization of organic matter, has been recently identified as a mechanism for previo… Show more

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Cited by 165 publications
(234 citation statements)
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References 59 publications
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“…Consistently, the CC/MC, that is, ratios of carbohydrate to methoxyl C, also positively related to initial Rh. In contrast, lignin is relatively resistant against biodegradation, which can be undertaken only by a limited species of soil microbes (predominantly fungi) due to its recalcitrant polyphenolic structure (Austin et al, ). Therefore, it is traditionally believed to be not or rarely degraded in initial decomposition phases (Berg & Matzner, ).…”
Section: Discussionmentioning
confidence: 99%
“…Consistently, the CC/MC, that is, ratios of carbohydrate to methoxyl C, also positively related to initial Rh. In contrast, lignin is relatively resistant against biodegradation, which can be undertaken only by a limited species of soil microbes (predominantly fungi) due to its recalcitrant polyphenolic structure (Austin et al, ). Therefore, it is traditionally believed to be not or rarely degraded in initial decomposition phases (Berg & Matzner, ).…”
Section: Discussionmentioning
confidence: 99%
“…Studies on photodegradation historically examined the UV range only, but recent studies have found that blue-green (400-550 nm) range of photosynthetically active radiation is also involved (Brandt et al 2009, Austin and Ballare 2010, Day et al 2015, Austin et al 2016. Studies on photodegradation historically examined the UV range only, but recent studies have found that blue-green (400-550 nm) range of photosynthetically active radiation is also involved (Brandt et al 2009, Austin and Ballare 2010, Day et al 2015, Austin et al 2016.…”
Section: Daycent-uvmentioning
confidence: 99%
“…The second is that photodegradation directly inhibits microbes, increasing microbial turnover from UV radiation damaging microbial cells (Kielbassa et al 1997, Johnson 2003, Zenoff et al 2006, Caldwell et al 2007, and reducing microbial activity , Hughes et al 2003, Uselman et al 2011, Lin et al 2015, Adair et al 2017. These mechanisms counteract, as direct degradation produces compounds that are more susceptible to subsequent microbial decomposition (Gallo et al 2009, Liu et al 2014, Wang et al 2015, Austin et al 2016. The mechanisms were incorporated into DayCent-UV, and the model was validated against observations from Long-Term Intersite Decomposition Experiment (LIDET) at three semi-arid sites in the western United States (Chen et al 2016).…”
Section: Introductionmentioning
confidence: 99%
“…Future research could investigate the role of photodegradation vs. biotic decomposition in semiarid agroecosystems to determine the magnitude of these processes in the regulation of litter decomposition. Research has indicated that the structural and chemical bottleneck induced by lignin content in litter can be "photoprimed" by UV radiation to enhance microbial decomposition processes (Austin et al, 2016). Further understanding these processes could assist in appropriately timing the fall rye kill date and improving the synchrony between cover crop N supply and crop N demand.…”
Section: Spring Wheat Grain Yield and Nitrogen Uptakementioning
confidence: 99%