Arid
DOI10.1007/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
ISSN1385-1314
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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