Soil organic carbon associated with aggregate-size and density fractions in a Mollisol amended with charred and uncharred maize straw
Straw return has been strongly recommended in China, whereas applying biochar into soil is considered to provide more benefits for agriculture as well as the environment. In this study, a five-year (2011–2015) field experiment was conducted to evaluate the effects of uncharred maize straw amendment...
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KeAi Communications Co., Ltd.
2019-07-01
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| Serie: | Journal of Integrative Agriculture |
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| Länkar: | http://www.sciencedirect.com/science/article/pii/S2095311919626432 |
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| author | Song GUAN Si-jia LIU Ri-yue LIU Jin-jing ZHANG Jun REN Hong-guang CAI Xin-xin LIN |
| author_facet | Song GUAN Si-jia LIU Ri-yue LIU Jin-jing ZHANG Jun REN Hong-guang CAI Xin-xin LIN |
| author_sort | Song GUAN |
| collection | DOAJ |
| description | Straw return has been strongly recommended in China, whereas applying biochar into soil is considered to provide more benefits for agriculture as well as the environment. In this study, a five-year (2011–2015) field experiment was conducted to evaluate the effects of uncharred maize straw amendment (MS) and charred maize straw amendment (charred MS) on organic carbon (C) contents in bulk soil and in various soil aggregate-size and density fractions. Compared to no amendment (CK), the bulk soil organic C content significantly improved by 9.30% for MS and by 23.4% for charred MS. Uncharred and charred maize straw applied annually at a consistent equal-C dosage resulted in 19.7 and 58.2% organic C sequestration efficiency in soil, respectively, after the five years of the field experiment. The percentages of macroaggregates (>0.25 mm) and occluded microaggregates (0.25–0.053 mm) obviously increased by 7.73 and 18.1% for MS and by 10.7 and 19.6% for charred MS, respectively. Moreover, significant incremental increases of 19.4 and 35.0% in macroaggregate-associated organic C occurred in MS and charred MS, respectively. The occluded microaggregates associated organic C significantly increased by 21.7% for MS and 25.1% for charred MS. Mineral-associated organic C (<0.053 mm) inside the macroaggregates and the occluded microaggregates obviously improved by 24.7 and 33.3% for MS and by 18.4 and 44.9% for charred MS. Organic C associated with coarse particulate organic matter (POM) within the macroaggregates markedly increased by 65.1 and 41.2% for MS and charred MS, respectively. Charred MS resulted in a noteworthy increment of 50.4% for organic C associated with heavy POM inside the occluded microaggregates, whereas charred MS and MS observably improved organic C associated with heavy POM inside the free microaggregates by 36.3 and 20.0%, respectively. These results demonstrate that uncharred and charred maize straw amendments improve C sequestration by physically protecting more organic C in the macroaggregates and the occluded microaggregates. Compared to the feedstock straw amendment, charred maize straw amendment is more advantageous to C sequestration. |
| format | Article |
| id | doaj-art-e6942472666141dab4ad2eafb4434973 |
| institution | Matheson Library |
| issn | 2095-3119 |
| language | English |
| publishDate | 2019-07-01 |
| publisher | KeAi Communications Co., Ltd. |
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| series | Journal of Integrative Agriculture |
| spelling | doaj-art-e6942472666141dab4ad2eafb44349732025-08-02T22:06:45ZengKeAi Communications Co., Ltd.Journal of Integrative Agriculture2095-31192019-07-0118714961507Soil organic carbon associated with aggregate-size and density fractions in a Mollisol amended with charred and uncharred maize strawSong GUAN0Si-jia LIU1Ri-yue LIU2Jin-jing ZHANG3Jun REN4Hong-guang CAI5Xin-xin LIN6Key Laboratory of Soil Resource Sustainable Utilization for Commodity Grain Bases of Jilin Province, College of Resource and Environmental Science, Jilin Agricultural University, Changchun 130118, P.R.China; Correspondence GUAN Song, Mobile: +86-13504467990Key Laboratory of Soil Resource Sustainable Utilization for Commodity Grain Bases of Jilin Province, College of Resource and Environmental Science, Jilin Agricultural University, Changchun 130118, P.R.ChinaKey Laboratory of Soil Resource Sustainable Utilization for Commodity Grain Bases of Jilin Province, College of Resource and Environmental Science, Jilin Agricultural University, Changchun 130118, P.R.ChinaKey Laboratory of Soil Resource Sustainable Utilization for Commodity Grain Bases of Jilin Province, College of Resource and Environmental Science, Jilin Agricultural University, Changchun 130118, P.R.China; Correspondence ZHANG Jin-jing, Tel: +86-431-84532955, Fax: +86-431-84531264Jilin Academy of Agricultural Sciences, Changchun 130033, P.R.China; Correspondence REN Jun, Tel: +86-431-87063030, Fax: +86-431-87063028Jilin Academy of Agricultural Sciences, Changchun 130033, P.R.ChinaKey Laboratory of Soil Resource Sustainable Utilization for Commodity Grain Bases of Jilin Province, College of Resource and Environmental Science, Jilin Agricultural University, Changchun 130118, P.R.ChinaStraw return has been strongly recommended in China, whereas applying biochar into soil is considered to provide more benefits for agriculture as well as the environment. In this study, a five-year (2011–2015) field experiment was conducted to evaluate the effects of uncharred maize straw amendment (MS) and charred maize straw amendment (charred MS) on organic carbon (C) contents in bulk soil and in various soil aggregate-size and density fractions. Compared to no amendment (CK), the bulk soil organic C content significantly improved by 9.30% for MS and by 23.4% for charred MS. Uncharred and charred maize straw applied annually at a consistent equal-C dosage resulted in 19.7 and 58.2% organic C sequestration efficiency in soil, respectively, after the five years of the field experiment. The percentages of macroaggregates (>0.25 mm) and occluded microaggregates (0.25–0.053 mm) obviously increased by 7.73 and 18.1% for MS and by 10.7 and 19.6% for charred MS, respectively. Moreover, significant incremental increases of 19.4 and 35.0% in macroaggregate-associated organic C occurred in MS and charred MS, respectively. The occluded microaggregates associated organic C significantly increased by 21.7% for MS and 25.1% for charred MS. Mineral-associated organic C (<0.053 mm) inside the macroaggregates and the occluded microaggregates obviously improved by 24.7 and 33.3% for MS and by 18.4 and 44.9% for charred MS. Organic C associated with coarse particulate organic matter (POM) within the macroaggregates markedly increased by 65.1 and 41.2% for MS and charred MS, respectively. Charred MS resulted in a noteworthy increment of 50.4% for organic C associated with heavy POM inside the occluded microaggregates, whereas charred MS and MS observably improved organic C associated with heavy POM inside the free microaggregates by 36.3 and 20.0%, respectively. These results demonstrate that uncharred and charred maize straw amendments improve C sequestration by physically protecting more organic C in the macroaggregates and the occluded microaggregates. Compared to the feedstock straw amendment, charred maize straw amendment is more advantageous to C sequestration.http://www.sciencedirect.com/science/article/pii/S2095311919626432soil organic carbonsoil aggregatesdensity fractionationmaize strawbiochar |
| spellingShingle | Song GUAN Si-jia LIU Ri-yue LIU Jin-jing ZHANG Jun REN Hong-guang CAI Xin-xin LIN Soil organic carbon associated with aggregate-size and density fractions in a Mollisol amended with charred and uncharred maize straw Journal of Integrative Agriculture soil organic carbon soil aggregates density fractionation maize straw biochar |
| title | Soil organic carbon associated with aggregate-size and density fractions in a Mollisol amended with charred and uncharred maize straw |
| title_full | Soil organic carbon associated with aggregate-size and density fractions in a Mollisol amended with charred and uncharred maize straw |
| title_fullStr | Soil organic carbon associated with aggregate-size and density fractions in a Mollisol amended with charred and uncharred maize straw |
| title_full_unstemmed | Soil organic carbon associated with aggregate-size and density fractions in a Mollisol amended with charred and uncharred maize straw |
| title_short | Soil organic carbon associated with aggregate-size and density fractions in a Mollisol amended with charred and uncharred maize straw |
| title_sort | soil organic carbon associated with aggregate size and density fractions in a mollisol amended with charred and uncharred maize straw |
| topic | soil organic carbon soil aggregates density fractionation maize straw biochar |
| url | http://www.sciencedirect.com/science/article/pii/S2095311919626432 |
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