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首页> 外文期刊>Soil Science Society of America Journal >Residue and Water Management Effects on Aggregate Stability and Aggregate-Associated Carbon and Nitrogen in a Wheat-Soybean, Double-Crop System
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Residue and Water Management Effects on Aggregate Stability and Aggregate-Associated Carbon and Nitrogen in a Wheat-Soybean, Double-Crop System

机译：残留量和水分管理对小麦-大豆双作系统总稳定性及总碳氮的影响

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Agricultural sustainability rests on the principle that the needs of the present population can be met while protecting the ability of future generations to meet their needs. Consequently, soil sustainability is paramount to assuring continued agricultural production. Soil structure and C storage can be influenced by producers' choices regarding residue and water management techniques. The objective of this study was to evaluate the long-term effects of alternative residue (i.e., tillage, residue burning, and fertility-residue level) and water management (irrigated and dryland) practices and soil depth after 10 yr of consistent management on total water-stable aggregate (TWSA; >0.25 mm) concentrations, size-separated aggregate concentrations, and corresponding C and N concentrations in a wheat (Triticum aestivum L.)-soybean [Glycine max (L.) Merr.] double-crop production system in the lower Mississippi River Delta region of eastern Arkansas. The TWSA concentration was unaffected by residue burning and not always negatively impacted by conventional tillage (CT). The TWSA concentrations were 19% greater (P < 0.05) under CT than no-tillage (NT) within the dryland low-fertility-residue treatment combination. High-fertility-residue resulted in 18% less (P < 0.05) TWSA than under low-fertility-residue within the irrigated-NT treatment combination. Under high-fertility-residue, TWSA concentrations were 13% less (P < 0.05) in the 5- to 10-cm depth under irrigation and were 10% less (P < 0.05) in the top 5 cm under dryland management compared to the low-fertility-residue treatment. The smallest two size classes (0.25-0.5 and 0.5-1.0 mm) comprised over 80% of the TWSA. Water-stable aggregate concentrations in the largest two size classes (1-2 and >2 mm) were unaffected by all treatments imposed. Results of this study indicate that interactions between long-term residue and water management practices can significantly impact soil aggregate stability, and thus are useful for aiding the determination of long-term agricultural management practices that improve soil quality in the Lower Mississippi River Delta region.
机译：农业的可持续性基于以下原则：既可以满足当前人口的需求，又可以保护子孙后代满足其需求的能力。因此，土壤的可持续性对于确保持续的农业生产至关重要。生产者在残留物和水管理技术方面的选择会影响土壤的结构和碳储量。这项研究的目的是评估持续管理10年后，替代性残留物（例如耕作，残留物燃烧和肥力残留水平）和水管理（灌溉和旱地）的做法以及土壤深度的长期影响。小麦[Glycine max（L.）Merr。]双作生产的水稳定骨料（TWSA;> 0.25 mm）浓度，大小分离的骨料浓度以及相应的C和N浓度在阿肯色州东部的密西西比河三角洲下游地区安装了该系统。 TWSA的浓度不受残渣燃烧的影响，并且并不总是受到常规耕作（CT）的不利影响。在旱地低肥力残留物处理组合中，CT下的TWSA浓度比免耕（NT）高19％（P <0.05）。在灌溉NT处理组合中，高肥力残留比低肥力残留减少了18％（P <0.05）TWSA。在高肥力残留条件下，相比于旱地管理，在5至10 cm深度处，TWSA浓度在5至10 cm深度处降低了13％（P <0.05），而在前5 cm处降低了10％（P <0.05）。低生育率残留治疗。最小的两个尺寸等级（0.25-0.5和0.5-1.0毫米）占TWSA的80％以上。最大的两个尺寸等级（1-2和> 2 mm）中水稳定的骨料浓度不受所施加的所有处理的影响。这项研究的结果表明，长期残留物与水管理实践之间的相互作用会显着影响土壤团聚体的稳定性，因此有助于确定改善密西西比河下游地区土壤质量的长期农业管理实践。

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