Water-Stable Aggregates and Associated Carbon in a Subtropical Rice Soil Under Variable Tillage
ABSTRACT Tillage systems can influence C sequestration by changing aggregate formation and C distribution within the aggregate. This study was undertaken to explore the impact of no-tillage without straw (NT-S) and with straw (NT+S), and moldboard plow without straw (MP-S) and with straw (MP+S), on...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Ciência do Solo
2016-01-01
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| Series: | Revista Brasileira de Ciência do Solo |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100514&lng=en&tlng=en |
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| author | Hui-Ping Ou Xi-Hui Liu Qiu-Shi Chen Yan-Fei Huang Ming-Ju He Hong-Wei Tan Fang-Long Xu Yang-Rui Li Ming-Hua Gu |
| author_facet | Hui-Ping Ou Xi-Hui Liu Qiu-Shi Chen Yan-Fei Huang Ming-Ju He Hong-Wei Tan Fang-Long Xu Yang-Rui Li Ming-Hua Gu |
| author_sort | Hui-Ping Ou |
| collection | DOAJ |
| description | ABSTRACT Tillage systems can influence C sequestration by changing aggregate formation and C distribution within the aggregate. This study was undertaken to explore the impact of no-tillage without straw (NT-S) and with straw (NT+S), and moldboard plow without straw (MP-S) and with straw (MP+S), on soil aggregation and aggregate-associated C after six years of double rice planting in a Hydragric Anthrosol in Guangxi, southwest of China. Soil samples of 0.00-0.05, 0.05-0.20 and 0.20-0.30 m layers were wet-sieved and divided into four aggregate-size classes, >2 mm, 2.00-0.25 mm, 0.25-0.053 and <0.053 mm, respectively, for measuring aggregate associated C and humic and fulvic acids. Results showed that the soil organic carbon (SOC) stock in bulk soil was 40.2-51.1 % higher in the 0.00-0.05 m layer and 11.3-17.0 % lower in the 0.05-0.20 m layer in NT system (NT+S and NT-S) compared to the MP system (MP+S and MP-S), respectively. However, no statistical difference was found across the whole 0.00-0.30 m layer. The NT system increased the proportion of >2 mm aggregate fraction and reduced the proportion of <0.053 mm aggregates in both 0.00-0.05 and 0.05-0.20 m layers. The SOC concentration, SOC stock and humic and fulvic acids within the >0.25 mm macroaggregate fraction also significantly increased in the 0.00-0.5 m layer in NT system. However, those within the 2.00-0.25 mm aggregate fraction were significantly reduced in the 0.05-0.200 m layer under NT system. Straw incorporation increased not only the SOC stock in bulk soil, but also the proportion of macroaggregate, aggregate associated with SOC and humic and fulvic acids concentration within the aggregate. The effect of straw on C sequestration might be dependent on the location of straw incorporation. In conclusion, the NT system increased the total SOC accumulation and humic and fulvic acids within macroaggregates, thus contributing to C sequestration in the 0.00-0.05 m layer. |
| first_indexed | 2024-12-16T11:29:06Z |
| format | Article |
| id | doaj.art-7f052727b54f4c21addbce3a330f69ae |
| institution | Directory Open Access Journal |
| issn | 1806-9657 |
| language | English |
| last_indexed | 2024-12-16T11:29:06Z |
| publishDate | 2016-01-01 |
| publisher | Sociedade Brasileira de Ciência do Solo |
| record_format | Article |
| series | Revista Brasileira de Ciência do Solo |
| spelling | doaj.art-7f052727b54f4c21addbce3a330f69ae2022-12-21T22:33:17ZengSociedade Brasileira de Ciência do SoloRevista Brasileira de Ciência do Solo1806-96572016-01-0140010.1590/18069657rbcs20150145S0100-06832016000100514Water-Stable Aggregates and Associated Carbon in a Subtropical Rice Soil Under Variable TillageHui-Ping OuXi-Hui LiuQiu-Shi ChenYan-Fei HuangMing-Ju HeHong-Wei TanFang-Long XuYang-Rui LiMing-Hua GuABSTRACT Tillage systems can influence C sequestration by changing aggregate formation and C distribution within the aggregate. This study was undertaken to explore the impact of no-tillage without straw (NT-S) and with straw (NT+S), and moldboard plow without straw (MP-S) and with straw (MP+S), on soil aggregation and aggregate-associated C after six years of double rice planting in a Hydragric Anthrosol in Guangxi, southwest of China. Soil samples of 0.00-0.05, 0.05-0.20 and 0.20-0.30 m layers were wet-sieved and divided into four aggregate-size classes, >2 mm, 2.00-0.25 mm, 0.25-0.053 and <0.053 mm, respectively, for measuring aggregate associated C and humic and fulvic acids. Results showed that the soil organic carbon (SOC) stock in bulk soil was 40.2-51.1 % higher in the 0.00-0.05 m layer and 11.3-17.0 % lower in the 0.05-0.20 m layer in NT system (NT+S and NT-S) compared to the MP system (MP+S and MP-S), respectively. However, no statistical difference was found across the whole 0.00-0.30 m layer. The NT system increased the proportion of >2 mm aggregate fraction and reduced the proportion of <0.053 mm aggregates in both 0.00-0.05 and 0.05-0.20 m layers. The SOC concentration, SOC stock and humic and fulvic acids within the >0.25 mm macroaggregate fraction also significantly increased in the 0.00-0.5 m layer in NT system. However, those within the 2.00-0.25 mm aggregate fraction were significantly reduced in the 0.05-0.200 m layer under NT system. Straw incorporation increased not only the SOC stock in bulk soil, but also the proportion of macroaggregate, aggregate associated with SOC and humic and fulvic acids concentration within the aggregate. The effect of straw on C sequestration might be dependent on the location of straw incorporation. In conclusion, the NT system increased the total SOC accumulation and humic and fulvic acids within macroaggregates, thus contributing to C sequestration in the 0.00-0.05 m layer.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100514&lng=en&tlng=enHydragric Anthrosolsoil organic carbonstraw incorporationtillage system |
| spellingShingle | Hui-Ping Ou Xi-Hui Liu Qiu-Shi Chen Yan-Fei Huang Ming-Ju He Hong-Wei Tan Fang-Long Xu Yang-Rui Li Ming-Hua Gu Water-Stable Aggregates and Associated Carbon in a Subtropical Rice Soil Under Variable Tillage Revista Brasileira de Ciência do Solo Hydragric Anthrosol soil organic carbon straw incorporation tillage system |
| title | Water-Stable Aggregates and Associated Carbon in a Subtropical Rice Soil Under Variable Tillage |
| title_full | Water-Stable Aggregates and Associated Carbon in a Subtropical Rice Soil Under Variable Tillage |
| title_fullStr | Water-Stable Aggregates and Associated Carbon in a Subtropical Rice Soil Under Variable Tillage |
| title_full_unstemmed | Water-Stable Aggregates and Associated Carbon in a Subtropical Rice Soil Under Variable Tillage |
| title_short | Water-Stable Aggregates and Associated Carbon in a Subtropical Rice Soil Under Variable Tillage |
| title_sort | water stable aggregates and associated carbon in a subtropical rice soil under variable tillage |
| topic | Hydragric Anthrosol soil organic carbon straw incorporation tillage system |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100514&lng=en&tlng=en |
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