Biochar stability in soil: meta‐analysis of decomposition and priming effects

GCB Bioenergy - Tập 8 Số 3 - Trang 512-523 - 2016
Jinyang Wang1,2, Zhengqin Xiong1, Yakov Kuzyakov2,3
1College of Resources and Environmental Sciences, Nanjing Agricultural University, 210095 Nanjing, China
2Department of Soil Science of Temperate Ecosystems, Department of Agricultural Soil Science, University of Göttingen, 37077 Göttingen, Germany
3Institute of Environmental Sciences, Kazan Federal University, Kazan, Russia

Tóm tắt

Abstract

The stability and decomposition of biochar are fundamental to understand its persistence in soil, its contribution to carbon (C) sequestration, and thus its role in the global C cycle. Our current knowledge about the degradability of biochar, however, is limited. Using 128 observations of biochar‐derived CO2 from 24 studies with stable (13C) and radioactive (14C) carbon isotopes, we meta‐analyzed the biochar decomposition in soil and estimated its mean residence time (MRT). The decomposed amount of biochar increased logarithmically with experimental duration, and the decomposition rate decreased with time. The biochar decomposition rate varied significantly with experimental duration, feedstock, pyrolysis temperature, and soil clay content. The MRTs of labile and recalcitrant biochar C pools were estimated to be about 108 days and 556 years with pool sizes of 3% and 97%, respectively. These results show that only a small part of biochar is bioavailable and that the remaining 97% contribute directly to long‐term C sequestration in soil. The second database (116 observations from 21 studies) was used to evaluate the priming effects after biochar addition. Biochar slightly retarded the mineralization of soil organic matter (SOM; overall mean: −3.8%, 95% CI = −8.1–0.8%) compared to the soil without biochar addition. Significant negative priming was common for studies with a duration shorter than half a year (−8.6%), crop‐derived biochar (−20.3%), fast pyrolysis (−18.9%), the lowest pyrolysis temperature (−18.5%), and small application amounts (−11.9%). In contrast, biochar addition to sandy soils strongly stimulated SOM mineralization by 20.8%. This indicates that biochar stimulates microbial activities especially in soils with low fertility. Furthermore, abiotic and biotic processes, as well as the characteristics of biochar and soils, affecting biochar decomposition are discussed. We conclude that biochar can persist in soils on a centennial scale and that it has a positive effect on SOM dynamics and thus on C sequestration.

Từ khóa


Tài liệu tham khảo

10.1890/0012-9658(1997)078[1277:RTFMAO]2.0.CO;2

10.1016/j.chemosphere.2013.10.071

10.1111/ejss.12064

10.1016/j.soilbio.2010.10.014

10.1111/j.1574-4976.2005.00010.x

10.1111/gcbb.12037

10.1029/1999GB900067

10.1007/s00374-008-0334-y

10.1016/j.orggeochem.2005.03.011

10.1111/j.1365-2389.2006.00807.x

10.1016/j.orggeochem.2008.04.020

10.1016/j.soilbio.2011.11.019

10.1111/ejss.12073

10.1007/s00114-006-0083-4

10.1016/j.orggeochem.2006.06.022

10.1029/2007JG000642

10.1111/gcbb.12030

10.1016/j.soilbio.2011.06.016

10.1111/gcbb.12035

10.1007/s004420050381

10.1111/ejss.12094

10.1016/j.agee.2014.02.018

10.1016/j.scitotenv.2013.03.090

10.1007/s11104-011-0773-3

10.1016/j.scitotenv.2006.06.007

10.1002/rcm.3448

10.1016/S0146-6380(98)00194-6

10.1016/S0146-6380(00)00044-9

10.1007/s00374-002-0466-4

10.1890/0012-9658(1999)080[1142:SIIEMA]2.0.CO;2

10.1371/journal.pone.0075932

10.1016/j.orggeochem.2004.03.003

10.5194/bg-5-1339-2008

10.1890/0012-9658(1999)080[1150:TMAORR]2.0.CO;2

10.1111/gcbb.12183

10.1016/j.orggeochem.2010.10.005

10.1016/j.orggeochem.2008.12.004

10.1007/s11430-009-0006-2

10.1016/j.agee.2011.08.015

10.1016/j.soilbio.2011.04.018

10.1021/es1014423

10.1021/es202186j

10.1007/s10533-007-9104-4

10.1016/j.orggeochem.2010.04.007

10.1016/j.quaint.2011.02.037

10.1016/j.soilbio.2015.01.025

10.1016/j.soilbio.2008.10.016

10.1016/j.soilbio.2013.12.021

10.1038/447143a

10.1007/s11027-005-9006-5

Lehmann J, 2009, Biochar for Environmental Management: Science and Technology, 183

10.1016/j.soilbio.2011.04.022

10.5194/bg-4-425-2007

10.1016/j.gca.2008.09.028

10.1016/j.orggeochem.2009.09.007

10.1002/jpln.201400058

10.1111/j.1365-2389.2006.00809.x

10.5194/bg-11-5199-2014

10.1111/gcbb.12194

10.1111/j.1365-2486.2009.02044.x

10.1016/j.soilbio.2013.03.013

10.1002/jpln.200700049

10.1126/science.280.5371.1911

10.1016/j.orggeochem.2009.05.004

10.1021/es903016y

10.1038/ngeo617

10.5194/bg-3-397-2006

10.1016/j.geoderma.2005.01.007

10.1016/j.soilbio.2012.04.005

10.1038/427305a

10.1029/1999GB001208

10.1029/2002GB001939

10.1038/nature10386

10.1016/j.orggeochem.2011.01.003

10.1038/srep03687

10.1021/es302545b

10.5194/bg-9-2847-2012

10.1111/gcb.12459

10.1023/A:1016125726789

10.1080/00103629909370372

Smith P, 2014, Climate Change 2014: Mitigation of Climate Change. Contribution of Working Group III to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change, 829

10.4155/cmt.10.32

10.1016/j.chemosphere.2011.06.108

10.1021/ez500199t

10.1016/j.soilbio.2009.03.016

10.1111/gcbb.12001

10.1016/j.soilbio.2014.02.009

10.1201/b14585-4

10.1038/ncomms1053

10.1016/S2095-3119(13)60704-2

10.1080/17583004.2014.973684

10.1021/es903140c

10.1016/j.soilbio.2011.02.005

10.1111/j.1365-2486.2012.02796.x

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GCB Bioenergy

Tập 8 Số 3

512-523

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