Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/s10705-008-9211-1 |
Effects of tillage systems on soil organic carbon dynamics, structural stability and crop yields in irrigated wheat (Triticum aestivum L.)-cotton (Gossypium hirsutum L.) rotation in semi-arid Zimbabwe | |
Gwenzi, W.1,2; Gotosa, J.3; Chakanetsa, S.4; Mutema, Z.2 | |
通讯作者 | Gwenzi, W. |
来源期刊 | NUTRIENT CYCLING IN AGROECOSYSTEMS
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ISSN | 1385-1314 |
出版年 | 2009 |
卷号 | 83期号:3页码:211-221 |
英文摘要 | In southern Africa, tillage research has focused on rainfed smallholder cropping systems, while literature on high-input irrigated cropping systems is limited. We evaluated the effects of conventional (CT), minimum (MT) and no-till (NT) tillage systems on soil organic carbon (SOC), bulk density, water-stable aggregates (WSA), mean weighted diameter (MWD) and crop yields in an irrigated wheat-cotton rotation. Soil data were monitored in the first and final year, while yields were monitored seasonally. Average bulk densities (1.5-1.7 Mg m(-3)) were similar among tillage systems, but often exceeded the critical limit (1.60 Mg m(-3)) for optimum root growth. Conversion from CT to MT and NT failed to ameliorate the high bulk densities associated with the alluvial soil. SOC (g kg(-1)) at 0-15 cm was higher (P < 0.05) under MT (3.9-5.8) and NT (4.2-5.6) than CT (2.9-3.3). Corresponding horizon SOC stocks (Mg C ha(-1)) for the tillage treatments were; 9.3-13.9 (MT), 9.3-13.5 (NT) and 7.3-7.7 (CT). In the final year, significant (P < 0.05) tillage effects on SOC stocks were also observed at 15-30 cm. Cumulative SOC stocks (Mg C ha(-1)) in the 0-60 cm profile were higher (P < 0.05) under MT (32.8-39.9) and NT (32.9-41.6) than CT (27.8-30.9). On average, MT and NT sequestered between 0.55 and 0.78 Mg C ha(-1) year(-1) at 0-30 cm depth, but a net decline (0.13 Mg C ha(-1) year(-1)) was observed under CT. At 0-30 cm, MT and NT had higher (P < 0.05) MWD (0.19-0.23 mm) and WSA (2.3-3.5%) than CT (MWD: 0.1-0.12 mm, WSA: a parts per thousand 1.0%). Both MWD and WSA were significantly (P < 0.05) correlated to SOC. Seasonal yields showed significant (P < 0.05) tillage effects, but 6-year mean yields (t ha(-1)) were similar (CT: 4.49, MT: 4.33, NT: 4.32 for wheat; CT: 3.30, MT: 2.82, NT: 2.83 for cotton). Overall, MT and NT improved soil structural stability and carbon sequestration, while impacts on crop productivity were limited. Therefore, MT and NT are more sustainable tillage systems for the semi-arid regions than conventional tillage. |
英文关键词 | Aggregate stability Bulk density Soil organic carbon stocks Tillage systems |
类型 | Article |
语种 | 英语 |
国家 | Australia ; Zimbabwe |
收录类别 | SCI-E |
WOS记录号 | WOS:000263018600002 |
WOS关键词 | LONG-TERM IMPACT ; STRATIFICATION RATIO ; NO-TILLAGE ; SEQUESTRATION ; AFRICA ; MANAGEMENT ; COMPONENTS ; QUALITY ; MATTER |
WOS类目 | Soil Science |
WOS研究方向 | Agriculture |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/162063 |
作者单位 | 1.Sch Earth & Geog Sci, Perth, WA 6009, Australia; 2.Save Valley Expt Stn, Dept Agr Res & Extens Serv, Chipinge, Zimbabwe; 3.Chem & Soils Res Inst, Dept Agr Res & Extens, Harare, Zimbabwe; 4.Cotton Res Inst, Dept Agr Res & Extens Serv, Kadoma, Osaka, Zimbabwe |
推荐引用方式 GB/T 7714 | Gwenzi, W.,Gotosa, J.,Chakanetsa, S.,et al. Effects of tillage systems on soil organic carbon dynamics, structural stability and crop yields in irrigated wheat (Triticum aestivum L.)-cotton (Gossypium hirsutum L.) rotation in semi-arid Zimbabwe[J],2009,83(3):211-221. |
APA | Gwenzi, W.,Gotosa, J.,Chakanetsa, S.,&Mutema, Z..(2009).Effects of tillage systems on soil organic carbon dynamics, structural stability and crop yields in irrigated wheat (Triticum aestivum L.)-cotton (Gossypium hirsutum L.) rotation in semi-arid Zimbabwe.NUTRIENT CYCLING IN AGROECOSYSTEMS,83(3),211-221. |
MLA | Gwenzi, W.,et al."Effects of tillage systems on soil organic carbon dynamics, structural stability and crop yields in irrigated wheat (Triticum aestivum L.)-cotton (Gossypium hirsutum L.) rotation in semi-arid Zimbabwe".NUTRIENT CYCLING IN AGROECOSYSTEMS 83.3(2009):211-221. |
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