相关实验视频
Updated: Jul 1, 2025
13:23
A Protocol for Collecting and Constructing Soil Core Lysimeters
Published on: June 6, 2016
11.7K
春季应用的损失与覆盖作物在没有耕种的梯田田地
Harpreet Kaur1, Kelly A Nelson2, Gurbir Singh2
1Statistical Programs, University of Idaho, Moscow ID, 83843, USA.
Journal of environmental management
|March 8, 2024
概括
与没有覆盖作物相比,谷物玉米覆盖作物显著减少了流水中的损失. 混合覆盖作物的影响最小,突出了对土壤管理的特定物种益处.
科学领域:
- 农业科学 农业科学
- 土壤科学 土壤科学
- 环境科学 环境科学
背景情况:
- (P) 循环对于作物营养和环境健康至关重要,特别是在易受土的脆弱粘土土中,这些土壤受融周期的影响.
- 覆盖作物 (CC) 通过减少与水有关的P损失和提高土壤P可用性,为P管理提供潜在的好处.
- 了解不同CC物种和混合物对P平衡的影响对于可持续的农业实践至关重要.
研究的目的:
- 评估CC单种作物 (谷物麦) 和CC混合物 (小麦,卜,) 对损失和土壤P.平衡的影响.
- 为了在四年内比较CCs下的P动态与没有覆盖作物 (noCC) 条件.
- 为了确定CC物种对P吸收,残留物分解和地表水流量的影响.
主要方法:
- 在美国中西部进行了为期四年的 (2019-2022) 实地研究,比较了CC单种植和三种CC混合物 (3xCCmix) 与noCC.
- 监测表面流水中的总 (TP) 和溶解反应 (PO4-P) 度和负载.
- 计算土壤P平衡,考虑P吸收,残留物分解和P损失.
主要成果:
- 与noCC相比,谷物玉米单一栽培显著降低了TP和PO4-P负载,分别为70%和73%.
- 3xCCmix对TP或PO4-P度或负载没有显著影响.
- 谷物麦表现出更大的P吸收 (2.4公斤/ha-1),并影响了土壤的P状态,比3xCCmix.
结论:
- 谷物麦有效地减少了表面流失中的P损失,并增强了P吸收,为土壤的P平衡做出了积极贡献.
- 测试的3xCCmix对P损失和土壤P状态的影响最小,这表明物种组成至关重要.
- CC残留物分解速率的变化会影响整体的P-土壤动态,需要仔细选择物种以实现最佳的P管理.
相关概念视频
01:21The Phosphorus Cycle
36.8K
Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
36.8K
02:35Key Elements for Plant Nutrition
18.7K
Like all living organisms, plants require organic and inorganic nutrients to survive, reproduce, grow and maintain homeostasis. To identify nutrients that are essential for plant functioning, researchers have leveraged a technique called hydroponics. In hydroponic culture systems, plants are grown—without soil—in water-based solutions containing nutrients. At least 17 nutrients have been identified as essential elements required by plants. Plants acquire these elements from the...
18.7K
02:41Responses to Drought and Flooding
10.7K
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
10.7K