Contrasting stream water temperature responses to global change in the Mid-Atlantic Region of the United States: A process-based modeling study
Contrasting stream water temperature responses to global change in the Mid-Atlantic Region of the United States: A process-based modeling study
复制标题
美国中大西洋地区溪流水温对全球变化的响应对比：基于过程的建模研究
DOI：
10.1016/j.jhydrol.2021.126633
复制
发表时间：
2021
影响因子：
6.4
通讯作者：
Li, Ya
中科院分区：
文献类型：
--
作者：
Yao, Yuanzhi;Tian, Hanqin;Kalin, Latif;Pan, Shufen;Friedrichs, Marjorie A.M.;Wang, Jing;Li, Ya
准确估计溪流水温对于了解环境对水生生态系统结构和功能的控制至关重要。很少有研究将土壤和溪流水温联系起来，以捕捉陆地和河流系统之间热平衡的协同作用。因此，人们对多种环境压力如何影响水温知之甚少，特别是对于不同的溪流而言。在这里，我们将一种新的水运输方案纳入动态陆地生态系统模型（DLEM）中，以预测一阶和高阶流（>一阶）中的水温。在多个环境因素的 4 公里地理参考数据集的驱动下，我们的新水温模型用于预测 1900 年至 2015 年美国中大西洋地区水温的时空变化。结果表明，1970-2015年水温显着升高（p<0.05），一级水流0.32°C∙decade−1的增长率高于高级水流0.28°C∙decade−1的增长率。在气候变暖的背景下，地下水对一级河流水温的缓冲作用减弱。因子分析表明，气候变化和变率解释了自 1900 年以来溪流水温的大部分变化 (~80%)。土地利用转变（主要是从农田到森林）、二氧化碳施肥和土地氮管理共同解释了一级溪流 (24%) 比高级溪流 (9%) 更大比例的水温变化，这意味着一级溪流特别容易受到人类活动的影响。
The accurate estimation of stream water temperature is essential for understanding environmental controls on the structure and functioning of aquatic ecosystems. Few studies have coupled soil and stream water temperatures to capture the synergy of thermal balances between terrestrial and riverine systems. As a result, little is known about how multiple environmental stresses have affected water temperature, particularly for different orders of streams. Here we incorporated a new water transport scheme into the Dynamic Land Ecosystem Model (DLEM) to predict water temperature in 1st order and higher-order streams (>1st order). Driven by a 4-km geo-referenced dataset of multiple environmental factors, our new water temperature model was utilized to predict the spatiotemporal variations of water temperature in the U.S. Mid-Atlantic Region during 1900–2015. Results revealed that water temperature during 1970–2015 increased significantly (p< 0.05), and the rate of increase of the 1st order streams 0.32 °C∙decade−1is higher than that of higher-order streams 0.28 °C ∙ decade−1. The buffering effect of groundwater on water temperature in 1st order streams diminished under the context of climate warming. Factorial analysis showed that climate change and variability explain most of the changes (~80%) in stream water temperature since 1900. Land-use conversions (mostly from cropland to forest), CO2fertilization, and land nitrogen management collectively explained a greater percent of change in water temperature in 1st order streams (24%) than higher-order streams (9%), implying that 1st order streams are particularly vulnerable to human activities.
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发表时间：
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