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出口系数的变化是特定的土地利用和值响应与流域特征的关系,在一个亚热带山区

Shaobo Yu¹, Cen Meng¹, Yuyuan Li¹

¹CAS Key Laboratory for Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Changsha 410125, China; University of Chinese Academy of sciences, Beijing 100049, China.

The Science of the total environment

|November 23, 2024

概括

土地使用 (P) 的出口在亚热带山区有很大差异,受流域特征和水文条件的影响. 了解这些动态是有效保护水质和土地利用规划的关键.

科学领域:

环境科学环境科学
水文学的水文学
生态系统科学生态系统科学

背景情况:

亚热带山地流域面临的挑战在管理 (P) 出口,由于复杂的土地利用相互作用.
流域特征的时空空间动态及其对P出口的影响尚未完全理解.
总出口系数 (TPEC) 对于量化不同土地使用类型的P贡献至关重要.

研究的目的:

在典型的亚热带山区量化TPEC的时空变化和不确定性.
在各种水文条件下确定影响TPEC的关键流域特征.
确定TPEC对有针对性的水质管理影响因素的值反应.

主要方法:

利用了来自中国老河流域的连续观测数据 (2012-2019).
采用了与贝叶斯统计方法集成的增强出口系数模型.
分析了不同流动模式下的森林,耕地和茶叶种植地的土地使用类型的TPEC.

主要成果:

在土地使用类型和水文条件之间观察到TPEC的显著时空差异.
流域特征解释了中 (68.5-74.1%) 和低 (33.3-50.4%) 流量模式下的大量TPEC变化,但在高流量 (1.9-3.8%) 下是最小的.
景观模式比地形和土壤因素对TPEC的影响更大;在中低流量下发现了突发TPEC变化的一致值.

结论:

研究结果强调了流域特征和水文条件在调节出口方面的关键作用.
识别的值反应为预测P出口变化和管理污染源提供了洞察力.
结果为确定关键的P污染区域和制定有效的盆地规模土地利用计划以保护水质提供了实际应用.

关键词:

贝叶斯统计学贝叶斯统计学出口系数模型中的出口系数.土地使用情况.的出口的出口.亚热带山区是一个亚热带山区.流域特征流域特征

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The Phosphorus Cycle

The Phosphorus Cycle

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.

Responses to Drought and Flooding

Responses to Drought and Flooding

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.

Factors Affecting Solubility

Factors Affecting Solubility

Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide: