Carbon Sequestration and Soil Aggregation in Center-Pivot Irrigated and Dryland Cultivated Farming Systems
Although irrigation is considered a beneficiary management for increasing soil organic C (SOC) stocks in (semi)arid environments, our understanding of the impact of irrigation on soil organic matter (SOM) dynamics in the field remains limited. We investigated the effect of irrigation on soil C stora...
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| Veröffentlicht in: | Soil Science Society of America journal 2007-05, Vol.71 (3), p.1020-1028 |
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| creator | Gillabel, J Denef, K Brenner, J Merckx, R Paustian, K |
| description | Although irrigation is considered a beneficiary management for increasing soil organic C (SOC) stocks in (semi)arid environments, our understanding of the impact of irrigation on soil organic matter (SOM) dynamics in the field remains limited. We investigated the effect of irrigation on soil C storage in relation to soil aggregation by measuring C stocks of bulk soil and different aggreagate fractions in the top 20-cm layer of center-pivot irrigated vs. dryland farming systems in semiarid southwestern Nebraska. The irrigated fields (IRR) showed increased C inputs and larger SOC stocks than the dryland cultivated fields (DRY). Fractionation of bulk soil samples into non-microaggregate-associated particulate organic matter (free POM) and microaggregate-associated POM, silt, and clay fractions indicated that the larger bulk SOC stock under IRR was explained solely by an increase in microaggregate-associated C storage Wet sieving of bulk soil showed that microaggregation was remarkably low under DRY and did not increase under IRR, suggesting that the protection of microaggregates inside macroaggregates was no prerequisite for C sequestration under IRR. The results of this study confirm the potential of irrigation to increase soil C stocks through preferential sequestration of C inside microaggregates, but question our understanding of the mechanisms underlying this preferential sequestration. |
| doi_str_mv | 10.2136/sssaj2006.0215 |
| format | Article |
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We investigated the effect of irrigation on soil C storage in relation to soil aggregation by measuring C stocks of bulk soil and different aggreagate fractions in the top 20-cm layer of center-pivot irrigated vs. dryland farming systems in semiarid southwestern Nebraska. The irrigated fields (IRR) showed increased C inputs and larger SOC stocks than the dryland cultivated fields (DRY). Fractionation of bulk soil samples into non-microaggregate-associated particulate organic matter (free POM) and microaggregate-associated POM, silt, and clay fractions indicated that the larger bulk SOC stock under IRR was explained solely by an increase in microaggregate-associated C storage Wet sieving of bulk soil showed that microaggregation was remarkably low under DRY and did not increase under IRR, suggesting that the protection of microaggregates inside macroaggregates was no prerequisite for C sequestration under IRR. The results of this study confirm the potential of irrigation to increase soil C stocks through preferential sequestration of C inside microaggregates, but question our understanding of the mechanisms underlying this preferential sequestration.</description><identifier>ISSN: 0361-5995</identifier><identifier>EISSN: 1435-0661</identifier><identifier>DOI: 10.2136/sssaj2006.0215</identifier><identifier>CODEN: SSSJD4</identifier><language>eng</language><publisher>Madison: Soil Science Society</publisher><subject>Aggregates ; Agricultural and farming systems ; Agricultural and forest climatology and meteorology. Irrigation. Drainage ; agricultural soils ; Agronomy. Soil science and plant productions ; Arid environments ; Arid zones ; Best management practices ; Biological and medical sciences ; Carbon ; Carbon sequestration ; center pivot irrigation ; Chemical, physicochemical, biochemical and biological properties ; Corn ; Dryland farming ; Farming systems ; Farmworkers ; Fractionation ; Fundamental and applied biological sciences. Psychology ; General agroecology. Agricultural and farming systems. Agricultural development. Rural area planning. Landscaping ; General agronomy. Plant production ; Generalities. Agricultural and farming systems. Agricultural development ; Irrigated farming ; Irrigation effects ; Irrigation systems ; Irrigation. Drainage ; microaggregates ; Moisture content ; Organic matter ; Particulate organic matter ; Physical properties ; Physics, chemistry, biochemistry and biology of agricultural and forest soils ; sampling ; semiarid soils ; soil aggregation ; soil organic carbon ; Soil organic matter ; Soil science ; soil separates ; soil water ; soil water regimes ; Soils ; Structure, texture, density, mechanical behavior. 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We investigated the effect of irrigation on soil C storage in relation to soil aggregation by measuring C stocks of bulk soil and different aggreagate fractions in the top 20-cm layer of center-pivot irrigated vs. dryland farming systems in semiarid southwestern Nebraska. The irrigated fields (IRR) showed increased C inputs and larger SOC stocks than the dryland cultivated fields (DRY). Fractionation of bulk soil samples into non-microaggregate-associated particulate organic matter (free POM) and microaggregate-associated POM, silt, and clay fractions indicated that the larger bulk SOC stock under IRR was explained solely by an increase in microaggregate-associated C storage Wet sieving of bulk soil showed that microaggregation was remarkably low under DRY and did not increase under IRR, suggesting that the protection of microaggregates inside macroaggregates was no prerequisite for C sequestration under IRR. The results of this study confirm the potential of irrigation to increase soil C stocks through preferential sequestration of C inside microaggregates, but question our understanding of the mechanisms underlying this preferential sequestration.</description><subject>Aggregates</subject><subject>Agricultural and farming systems</subject><subject>Agricultural and forest climatology and meteorology. Irrigation. Drainage</subject><subject>agricultural soils</subject><subject>Agronomy. Soil science and plant productions</subject><subject>Arid environments</subject><subject>Arid zones</subject><subject>Best management practices</subject><subject>Biological and medical sciences</subject><subject>Carbon</subject><subject>Carbon sequestration</subject><subject>center pivot irrigation</subject><subject>Chemical, physicochemical, biochemical and biological properties</subject><subject>Corn</subject><subject>Dryland farming</subject><subject>Farming systems</subject><subject>Farmworkers</subject><subject>Fractionation</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>General agroecology. Agricultural and farming systems. Agricultural development. Rural area planning. Landscaping</subject><subject>General agronomy. Plant production</subject><subject>Generalities. Agricultural and farming systems. Agricultural development</subject><subject>Irrigated farming</subject><subject>Irrigation effects</subject><subject>Irrigation systems</subject><subject>Irrigation. Drainage</subject><subject>microaggregates</subject><subject>Moisture content</subject><subject>Organic matter</subject><subject>Particulate organic matter</subject><subject>Physical properties</subject><subject>Physics, chemistry, biochemistry and biology of agricultural and forest soils</subject><subject>sampling</subject><subject>semiarid soils</subject><subject>soil aggregation</subject><subject>soil organic carbon</subject><subject>Soil organic matter</subject><subject>Soil science</subject><subject>soil separates</subject><subject>soil water</subject><subject>soil water regimes</subject><subject>Soils</subject><subject>Structure, texture, density, mechanical behavior. 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We investigated the effect of irrigation on soil C storage in relation to soil aggregation by measuring C stocks of bulk soil and different aggreagate fractions in the top 20-cm layer of center-pivot irrigated vs. dryland farming systems in semiarid southwestern Nebraska. The irrigated fields (IRR) showed increased C inputs and larger SOC stocks than the dryland cultivated fields (DRY). Fractionation of bulk soil samples into non-microaggregate-associated particulate organic matter (free POM) and microaggregate-associated POM, silt, and clay fractions indicated that the larger bulk SOC stock under IRR was explained solely by an increase in microaggregate-associated C storage Wet sieving of bulk soil showed that microaggregation was remarkably low under DRY and did not increase under IRR, suggesting that the protection of microaggregates inside macroaggregates was no prerequisite for C sequestration under IRR. The results of this study confirm the potential of irrigation to increase soil C stocks through preferential sequestration of C inside microaggregates, but question our understanding of the mechanisms underlying this preferential sequestration.</abstract><cop>Madison</cop><pub>Soil Science Society</pub><doi>10.2136/sssaj2006.0215</doi><tpages>9</tpages><oa>free_for_read</oa></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0361-5995 |
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| issn | 0361-5995 1435-0661 |
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| subjects | Aggregates Agricultural and farming systems Agricultural and forest climatology and meteorology. Irrigation. Drainage agricultural soils Agronomy. Soil science and plant productions Arid environments Arid zones Best management practices Biological and medical sciences Carbon Carbon sequestration center pivot irrigation Chemical, physicochemical, biochemical and biological properties Corn Dryland farming Farming systems Farmworkers Fractionation Fundamental and applied biological sciences. Psychology General agroecology. Agricultural and farming systems. Agricultural development. Rural area planning. Landscaping General agronomy. Plant production Generalities. Agricultural and farming systems. Agricultural development Irrigated farming Irrigation effects Irrigation systems Irrigation. Drainage microaggregates Moisture content Organic matter Particulate organic matter Physical properties Physics, chemistry, biochemistry and biology of agricultural and forest soils sampling semiarid soils soil aggregation soil organic carbon Soil organic matter Soil science soil separates soil water soil water regimes Soils Structure, texture, density, mechanical behavior. Heat and gas exchanges Studies |
| title | Carbon Sequestration and Soil Aggregation in Center-Pivot Irrigated and Dryland Cultivated Farming Systems |
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