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| Titel |
Role of biochar in low carbon sustainable crop production of China: a synthesizing analysis of field studies |
| VerfasserIn |
Jufeng Zheng, Xiaoyu Liu, Afeng Zhang, Gang Wu, Bin Zhang, Kun Cheng, Lianqing Li, Yuming Liu, Jingjing Qu, Dengxiao Zhang, Grace Kubie, Siddie Muhanmud, Genxing Pan |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250072154
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| Zusammenfassung |
| Zheng Jufeng1, Liu Xiaoyu1¶, Zhang Afeng1¶, Wu Gang1¶, Zhang Bin1¶, Cheng Kun1¶,Li
Lianqing 1¶, Liu Yuming1¶, Qu Jingjing1, Zhang Dengxiao1, Kubie Grace 1, Muhanmud
Siddie 1, Pan Genxing1
1,Center of Climate Change and Agriculture, and Institute of Resource, Ecosystem and
Environment of Agriculture, Nanjing Agricultural University,1 Weigang, Nanjing 210095,
China
¶These authors made equal contribution with either performing field studies for single
sites or data collecting and analysis.
Corresponding author: Genxing Pan
Address: Institute of Resource, Ecosystem and Environment of Agriculture,
Nanjing
Agricultural University, 1 Weigang, Nanjing 210095, China
Abbreviations: BSA, BSA; LCA, low carbon agriculture; RP, rice paddy(ies); DC: dry
cropland(s); GHGs, greenhouse gases; GWP: global warming potential
Abstract
BSA (BSA) has been proposed as a measure to enhance soil organic C sequestration and
mitigate greenhouse gas emission from world croplands. In this study, results of BSA field
experiments with rice paddy and dry croplands in 7 sites over China were synthesized for
addressing an overall role of biochar in low carbon sustainable crop production. Soil
amendment at rates of 0, 20 t ha-1 and 40 t ha-1 of biochar via pyrolysis from wheat straw at
35o-550°was performed consistently across the sites with local conventional fertilization
and crop managements. Soil emission monitoring of non-CO2 greenhouse gases
(CH4 and N2O) was conducted at 1 week interval during crop growing season in
the year of BSA all sites and the subsequent year after BSA in some sites. Yield
and properties, greenhouse gases (CH4 and N2O) and C intensity were assessed.
The results from single experiments were synthesized for quantifying the relative
changes in yield and GWP with BSA as well as changes in soil properties. BSA
increased significantly soil pH, TN, SOC and decrease soil bulk density. On average,
crop yield was significantly increased (~6% for rice and 10%~18% for maize) at
an extent higher in croplands than in rice paddies. While BSA reduced slightly
CH4 uptake in dry cropland, increases in CH4 emission showed a large uncertainty
related to soil and climate condition as well as water regime from rice paddies.
However,N2O emission from treated croplands were significantly reduced with BSA by
37~48% across sites. As the integration effect, global warming potential (GWP) and C
intensity were decreased averagely by over 30% agriculture production (38% ~
44% in dry cropland and 22% ~ 42% in paddy soil) with BSA, which was a great
contribution to mitigation of CO2 in Chinese agriculture. The results further implicated
BSA to cropland may to develop sustainable low carbon agriculture as a feasible
measure.
Key words: Biochar soil application, soil properties, C sequestration, CH4 and N2O
mitigation, C intensity, synthesizing analysis |
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