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Carbon sequestration and turnover in soil under the energy crop Miscanthus: Repeated <sup>13</sup>C natural abundance approach and literature synthesis

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dc.contributor.author Zang H.
dc.contributor.author Blagodatskaya E.
dc.contributor.author Wen Y.
dc.contributor.author Xu X.
dc.contributor.author Dyckmans J.
dc.contributor.author Kuzyakov Y.
dc.date.accessioned 2018-04-05T07:10:00Z
dc.date.available 2018-04-05T07:10:00Z
dc.date.issued 2017
dc.identifier.issn 1757-1693
dc.identifier.uri http://dspace.kpfu.ru/xmlui/handle/net/130128
dc.description.abstract © 2017 John Wiley & Sons Ltd. The stability and turnover of soil organic matter (SOM) are a very important but poorly understood part of carbon (C) cycling. Conversion of C 3 grassland to the C 4 energy crop Miscanthus provides an ideal opportunity to quantify medium-term SOM dynamics without disturbance (e.g., plowing), due to the natural shift in the δ 13 C signature of soil C. For the first time, we used a repeated 13 C natural abundance approach to measure C turnover in a loamy Gleyic Cambisol after 9 and 21 years of Miscanthus cultivation. This is the longest C 3 -C 4 vegetation change study on C turnover in soil under energy crops. SOM stocks under Miscanthus and reference grassland were similar down to 1 m depth. However, both increased between 9 and 21 years from 105 to 140 mg C ha -1 (P < 0.05), indicating nonsteady state of SOM. This calls for caution when estimating SOM turnover based on a single sampling. The mean residence time (MRT) of old C ( > 9 years) increased with depth from 19 years (0-10 cm) to 30-152 years (10-50 cm), and remained stable below 50 cm. From 41 literature observations, the average SOM increase after conversion from cropland or grassland to Miscanthus was 6.4 and 0.4 mg C ha -1 , respectively. The MRT of total C in topsoil under Miscanthus remained stable at ~60 years, independent of plantation age, corroborating the idea that C dynamics are dominated by recycling processes rather than by C stabilization. In conclusion, growing Miscanthus on C-poor arable soils caused immediate C sequestration because of higher C input and decreased SOM decomposition. However, after replacing grasslands with Miscanthus, SOM stocks remained stable and the MRT of old C 3 -C increased strongly with depth.
dc.relation.ispartofseries GCB Bioenergy
dc.subject 13 C natural abundance
dc.subject C -C vegetation change 3 4
dc.subject Carbon sequestration
dc.subject Energy crop
dc.subject Mean residence time
dc.subject Soil organic matter
dc.title Carbon sequestration and turnover in soil under the energy crop Miscanthus: Repeated <sup>13</sup>C natural abundance approach and literature synthesis
dc.type Article in Press
dc.collection Публикации сотрудников КФУ
dc.source.id SCOPUS17571693-2017-SID85033722767


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  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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