Effects of straw carbon input on carbon dynamics in agricultural soils: a meta‐analysis

Straw return has been widely recommended as an environmentally friendly practice to manage carbon (C) sequestration in agricultural ecosystems. However, the overall trend and magnitude of changes in soil C in response to straw return remain uncertain. In this meta-analysis, we calculated the response ratios of soil organic C (SOC) concentrations, greenhouse gases (GHGs) emission, nutrient contents and other important soil properties to straw addition in 176 published field studies. Our results indicated that straw return significantly increased SOC concentration by 12.8 ± 0.4% on average, with a 27.4 ± 1.4% to 56.6 ± 1.8% increase in soil active C fraction. CO2 emission increased in both upland (27.8 ± 2.0%) and paddy systems (51.0 ± 2.0%), while CH4 emission increased by 110.7 ± 1.2% only in rice paddies. N2 O emission has declined by 15.2 ± 1.1% in paddy soils but increased by 8.3 ± 2.5% in upland soils. Responses of macro-aggregates and crop yield to straw return showed positively linear with increasing SOC concentration. Straw-C input rate and clay content significantly affected the response of SOC. A significant positive relationship was found between annual SOC sequestered and duration, suggesting that soil C saturation would occur after 12 years under straw return. Overall, straw return was an effective means to improve SOC accumulation, soil quality, and crop yield. Straw return-induced improvement of soil nutrient availability may favor crop growth, which can in turn increase ecosystem C input. Meanwhile, the analysis on net global warming potential (GWP) balance suggested that straw return increased C sink in upland soils but increased C source in paddy soils due to enhanced CH4 emission. Our meta-analysis suggested that future agro-ecosystem models and cropland management should differentiate the effects of straw return on ecosystem C budget in upland and paddy soils.

[1]  Peter S. Curtis,et al.  A meta-analysis of elevated CO2 effects on woody plant mass, form, and physiology , 1998, Oecologia.

[2]  Yao Huang,et al.  Modeling methane emissions from irrigated rice cultivation in China from 1960 to 2050 , 2011 .

[3]  R. Lal,et al.  Soil Carbon Sequestration Impacts on Global Climate Change and Food Security , 2004, Science.

[4]  E. Paul,et al.  DECOMPOSITION OF 14C-LABELLED PLANT MATERIAL UNDER FIELD CONDITIONS , 1973 .

[5]  Jessica Gurevitch,et al.  STATISTICAL ISSUES IN ECOLOGICAL META‐ANALYSES , 1999 .

[6]  E. Rastetter,et al.  PLANT CARBON–NUTRIENT INTERACTIONS CONTROL CO2 EXCHANGE IN ALASKAN WET SEDGE TUNDRA ECOSYSTEMS , 2000 .

[7]  Yuesi Wang,et al.  Direct emission factor for N2O from rice–winter wheat rotation systems in southeast China , 2005 .

[8]  Yiqi Luo,et al.  Dynamic disequilibrium of the terrestrial carbon cycle under global change. , 2011, Trends in ecology & evolution.

[9]  D. Angers,et al.  Full‐Inversion Tillage and Organic Carbon Distribution in Soil Profiles: A Meta‐Analysis , 2008 .

[10]  B. Mandal,et al.  Effect of organic inputs on aggregate associated organic carbon concentration under long-term rice–wheat cropping system , 2010 .

[11]  K. Yagi,et al.  Effect of water management on methane emission from a Japanese rice paddy field: Automated methane monitoring , 1996 .

[12]  Yiqi Luo,et al.  Elevated CO2 stimulates net accumulations of carbon and nitrogen in land ecosystems: a meta-analysis. , 2006, Ecology.

[13]  Hongwen Li,et al.  Effects of 11 years of conservation tillage on soil organic matter fractions in wheat monoculture in Loess Plateau of China , 2009 .

[14]  R. J. Haynes,et al.  Labile organic matter as an indicator of organic matter quality in arable and pastoral soils in New Zealand , 2000 .

[15]  Lin-zhang Yang,et al.  Long-term effects of fertilizer managements on crop yields and organic carbon storage of a typical rice–wheat agroecosystem of China , 2007, Biology and Fertility of Soils.

[16]  B. Chambers,et al.  Organic carbon additions: effects on soil bio‐physical and physico‐chemical properties , 2009 .

[17]  Robert W. Howarth,et al.  Nitrogen limitation on land and in the sea: How can it occur? , 1991 .

[18]  K. Paustian,et al.  Stabilization mechanisms of soil organic matter: Implications for C-saturation of soils , 2002, Plant and Soil.

[19]  Gang Liu,et al.  CO2 mitigation potential in farmland of China by altering current organic matter amendment pattern , 2010 .

[20]  J. Six,et al.  Considering the influence of sequestration duration and carbon saturation on estimates of soil carbon capacity , 2007 .

[21]  T. Greaver,et al.  A review of nitrogen enrichment effects on three biogenic GHGs: the CO2 sink may be largely offset by stimulated N2O and CH4 emission. , 2009, Ecology letters.

[22]  G. Pan,et al.  Topsoil organic carbon storage of China and its loss by cultivation , 2005 .

[23]  G. Baldoni,et al.  Can mineral and organic fertilization help sequestrate carbon dioxide in cropland , 2008 .

[24]  D. Benbi,et al.  Soil aggregation and carbon and nitrogen stabilization in relation to residue and manure application in rice–wheat systems in northwest India , 2010, Nutrient Cycling in Agroecosystems.

[25]  Julie D. Jastrow,et al.  Soil aggregate formation and the accrual of particulate and mineral-associated organic matter , 1996 .

[26]  R. Lal,et al.  EFFECTS OF WHEAT RESIDUE FERTILIZATION ON ACCUMULATION AND BIOCHEMICAL ATTRIBUTES OF ORGANIC CARBON IN A CENTRAL OHIO LUVISOL , 2002 .

[27]  F. Conen,et al.  Potential for detecting changes in soil organic carbon concentrations resulting from climate change , 2003 .

[28]  Bo Li,et al.  Responses of ecosystem nitrogen cycle to nitrogen addition: a meta-analysis. , 2011, The New phytologist.

[29]  Emanuele Lugato,et al.  Soil organic carbon (SOC) dynamics with and without residue incorporation in relation to different nitrogen fertilisation rates , 2006 .

[30]  Jinmin Hao,et al.  Influences of Long-Term Fertilizer and Tillage Management on Soil Fertility of the North China Plain , 2011 .

[31]  G. Pan,et al.  Storage and sequestration potential of topsoil organic carbon in China's paddy soils , 2004 .

[32]  Yongchao Liang,et al.  CO2 emissions from subtropical arable soils of China , 2004 .

[33]  E. Sparrow,et al.  Long-term tillage and crop residue management in the subarctic: fluxes of methane and nitrous oxide , 1997 .

[34]  R. Lal,et al.  Carbon budget study using CO2 flux measurements from a no till system in central Ohio , 2000 .

[35]  H. W. Hunt,et al.  Management options for reducing CO2 emissions from agricultural soils , 2000 .

[36]  J. Iqbal,et al.  CO2 emission in a subtropical red paddy soil (Ultisol) as affected by straw and N-fertilizer applications: a case study in Southern China. , 2009 .

[37]  N. Jain,et al.  Recycling of rice straw to improve wheat yield and soil fertility and reduce atmospheric pollution , 2006, Paddy and Water Environment.

[38]  S. Malhi,et al.  Long-term tillage, straw and N rate effects on some chemical properties in two contrasting soil types in Western Canada , 2011, Nutrient Cycling in Agroecosystems.

[39]  C. Campbell,et al.  Effect of crop management on C and N in long-term crop rotations after adopting no-tillage management: comparison of soil sampling strategies , 1998 .

[40]  R. Lal,et al.  The potential of world cropland soils to sequester C and mitigate the greenhouse effect , 1999 .

[41]  Pete Smith,et al.  Carbon cycle: A warm response by soils , 2010, Nature.

[42]  Shiwei Guo,et al.  Net annual global warming potential and greenhouse gas intensity in Chinese double rice‐cropping systems: a 3‐year field measurement in long‐term fertilizer experiments , 2011 .

[43]  D. Jenkinson.  STUDIES ON THE DECOMPOSITION OF C14 LABELLED ORGANIC MATTER IN SOIL , 1971 .

[44]  R. Lal,et al.  Offsetting China's CO2 Emissions by Soil Carbon Sequestration , 2004 .

[45]  R. Lal,et al.  Conservation tillage for carbon sequestration , 1997, Nutrient Cycling in Agroecosystems.

[46]  H. Neue,et al.  Effect of organic matter input on functional pools of soil organic carbon in a long‐term double rice crop experiment in China , 2011 .

[47]  Z. Cai,et al.  Dynamics of crop yields and soil organic carbon in a long-term fertilization experiment in the Huang-Huai-Hai Plain of China , 2006 .

[48]  Ming Liu,et al.  Effects of long-term chemical fertilization and organic amendments on dynamics of soil organic C and total N in paddy soil derived from barren land in subtropical China , 2010 .

[49]  K. Paustian,et al.  Soil carbon saturation: concept, evidence and evaluation , 2007 .

[50]  K. Yagi,et al.  Methane emission from paddy soils as affected by wheat straw returning mode , 2008, Plant and Soil.

[51]  R. Lal,et al.  Potential of mine land reclamation for soil organic carbon sequestration in Ohio. , 2000 .

[52]  Z. Ouyang,et al.  Soil carbon sequestrations by nitrogen fertilizer application, straw return and no‐tillage in China's cropland , 2009 .

[53]  M. Jetten,et al.  Nitrous oxide production by Alcaligenes faecalis under transient and dynamic aerobic and anaerobic conditions , 1996, Applied and environmental microbiology.

[54]  G. Marland,et al.  A synthesis of carbon sequestration, carbon emissions, and net carbon flux in agriculture: comparing tillage practices in the United States , 2002 .

[55]  R. G. Evans,et al.  Carbon dioxide flux as affected by tillage and irrigation in soil converted from perennial forages to annual crops. , 2008, Journal of environmental management.

[56]  Johan Six,et al.  The relationship between carbon input, aggregation, and soil organic carbon stabilization in sustainable cropping systems , 2005 .

[57]  Zhongkui Luo,et al.  Can no-tillage stimulate carbon sequestration in agricultural soils? A meta-analysis of paired experiments , 2010 .

[58]  J. Syers,et al.  Improving fertility and productivity of a highly-weathered upland soil in subtropical China by incorporating rice straw , 2010, Plant and Soil.

[59]  Jessica Gurevitch,et al.  THE META‐ANALYSIS OF RESPONSE RATIOS IN EXPERIMENTAL ECOLOGY , 1999 .

[60]  R. Lal,et al.  Crop Management for Soil Carbon Sequestration , 2003 .

[61]  Bruno Mary,et al.  Nitrous oxide production by nitrification and denitrification in soil aggregates as affected by O2 concentration , 2004 .

[62]  Y. Kuzyakov,et al.  Review of estimation of plant rhizodeposition and their contribution to soil organic matter formation , 2004 .

[63]  J. Diekmann,et al.  Effect of shallow tillage, moldboard plowing, straw management and compost addition on soil organic matter and nitrogen in a dryland barley/wheat-vetch rotation , 2011 .

[64]  C. Guerrero,et al.  Effects of agricultural management on surface soil properties and soil–water losses in eastern Spain , 2009 .

[65]  Corinne Le Quéré,et al.  Trends in the sources and sinks of carbon dioxide , 2009 .

[66]  Claire Chenu,et al.  Relationship of soil organic matter dynamics to physical protection and tillage , 2000 .

[67]  R. Conrad,et al.  Dynamics of the methanogenic archaeal community in anoxic rice soil upon addition of straw , 2006 .

[68]  Johan Six,et al.  The potential to mitigate global warming with no‐tillage management is only realized when practised in the long term , 2004 .

[69]  Yiqi Luo,et al.  inor stimulation of soil carbon storage by nitrogen addition : A meta-analysis , 2011 .

[70]  David S. Powlson,et al.  Meeting Europe's climate change commitments: quantitative estimates of the potential for carbon mitigation by agriculture , 2000 .

[71]  R. Hatano,et al.  Methane emissions from five paddy fields with different amounts of rice straw application in central Hokkaido, Japan , 2007 .

[72]  G. Pan,et al.  Combined inorganic/organic fertilization enhances N efficiency and increases rice productivity through organic carbon accumulation in a rice paddy from the Tai Lake region, China. , 2009 .

[73]  R. Lal,et al.  Crop residue and tillage effects on carbon sequestration in a Luvisol in central Ohio , 1999 .

[74]  Xiaoyuan Yan,et al.  Methane and nitrous oxide emissions from rice paddy fields , 2002 .