耕作和覆盖作物系统改变了高床垄作农业生态系统中的土壤颗粒大小分布

IF 2.9 Q2 SOIL SCIENCE
Alayna A. Jacobs, Rachel Stout Evans, Jon K. Allison, W. Kingery, R. McCulley, K. Brye
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引用次数: 0

摘要

包括免耕(NT)和覆盖作物(CC)在内的水土保持替代方法可减少行作物农业生态系统中的土壤侵蚀。然而,关于这些替代方法如何影响土壤肥力的土壤质地特性的信息却很少。本研究评估了高床系统经过三年持续管理后的土壤颗粒大小分布和体积含水量。在淤泥质壤土(Oxyaquic Fraglossudalfs)上的旱地玉米/大豆轮作中,有四种处理系统,包括密西西比州西北部的旱地玉米/大豆轮作系统包括:NT + CCs、常规耕作 (CT) + CCs、CT + 冬季杂草以及 CT + 冬季裸土。与其他系统相比,NT + CC 系统在沟中保留的粗沙多 62%(2.1% 对 1.3%;p = 0.02)。无论位置如何,NT + CC 系统(2.5%)比 CT + CC 系统(1.8%;p = 0.01)多保留 39% 的细沙,这表明粗沙和细沙被截留在结合了 NT + CC 系统的犁沟中,最大程度地减少了它们的异地迁移。在沟中,与其他冬季覆盖物相比,CCs 使土壤容积含水量增加了 47%。在床面,与 CT + CC 相比,NT + CC 可使床面含水量增加 20%(17.1% 比 14.3%;p < 0.01)。实施保护性替代措施可促进淤泥质壤土中沙粒的保留,这对支持土壤肥力和作物的可持续性非常重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Tillage and Cover Crop Systems Alter Soil Particle Size Distribution in Raised-Bed-and-Furrow Row-Crop Agroecosystems
Conservation alternatives that include no-tillage (NT) and cover crops (CCs) reduce soil erosion in row-crop agroecosystems. However, little information is available about how these alternatives affect soil textural properties responsible for soil fertility. This study evaluated the soil particle size distribution and volumetric water content after three years of consistent management in a raised bed system. There were four treatment systems in a dryland maize/soybean rotation on a silt loam soil (Oxyaquic Fraglossudalfs) that included: NT + CCs, conventional tillage (CT) + CCs, CT + winter weeds, and CT + bare soil in winter in northwest Mississippi. The NT + CC system retained 62% more coarse sand in the furrow than the other systems (2.1% compared to 1.3%; p = 0.02). Regardless of the location, the NT + CC system (2.5%) retained 39% more fine sand than the CT + CC system (1.8%; p = 0.01), suggesting that coarse and fine sands were being trapped in furrows combining NT + CC systems, minimizing their off-site transport. In furrows, CCs increased soil volumetric water content by 47% compared to other winter covers. In beds, NT + CCs increased bed water contents by 20% compared to CT + CCs (17.1 to 14.3%; p < 0.01). Implementing conservation alternatives may promote the retention of sand fractions in silty loam soils that are important in supporting soil fertility and crop sustainability.
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来源期刊
Soil Systems
Soil Systems Earth and Planetary Sciences-Earth-Surface Processes
CiteScore
5.30
自引率
5.70%
发文量
80
审稿时长
11 weeks
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