2000 - 2024年云贵高原湖泊颗粒物有机质比例的长期下降

IF 5 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies Pub Date : 2025-09-29 DOI:10.1016/j.ejrh.2025.102802

Fangfang Chen , Jie Xi , Shijiao Lu , Chenyang Wei , Huaiqing Liu , Heng Lyu , Yunmei Li , Wenyu Liu , Yuxin Zhu , Qingxia Miao , Yiling Zheng

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引用次数: 0

摘要

研究区域云黔高原湖泊（YGPL）颗粒组成是了解水下光场和初级生产力变化的关键。本研究基于中分辨率成像光谱辐射计（MODIS）大气校正表面反射率波段比（555 nm/645 nm），利用1215个原位样品估算颗粒物组成（有机悬浮物/总悬浮物，OSM/TSM），开发了一种经验算法。利用一般线性模型（GLM）和偏最小二乘结构方程模型（PLS-SEM）进一步探讨了OSM/TSM的年内和年际变化，并通过分析2000 - 2024年洱海OSM/TSM与淹没植被（SV）的协变来检验其相关性。OSM/TSM算法表现出令人满意的性能（R²=0.71，RMSE=0.14， UMAPE= 31.23 %）。结果表明：城市湖泊的年平均OSM/TSM是天然湖泊的1.3倍，且各湖泊在夏季和秋季均呈现一致的季节性高峰；除滇池和阳宗海外，大多数湖泊的OSM/TSM呈微弱但持续的长期下降趋势（-0.003 yr⁻¹）。GLM分析显示，风速是影响年内OSM/TSM变异的主要因素，占45.58 ± 15.94 %。PLS-SEM结果表明，气候因子是自然湖泊和半城市湖泊年际变化的主要驱动力，而城市湖泊年际变化的主要驱动力是湖泊扩张和夜间光照等人类活动。OSM/TSM是潜水植被生长的潜在影响因子。

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Long-term decline in the proportion of particulate organic matter in Yunnan-Guizhou plateau lakes from 2000 to 2024

Study region

Yunnan-Guizhou Plateau lakes(YGPL)

Study focus

Particulate composition is critical for understanding the changes in underwater light fields and primary productivity. In this study, an empirical algorithm was developed based on a band ratio (555 nm/645 nm) of atmospherically corrected surface reflectance of the Moderate Resolution Imaging Spectro-radiometer(MODIS), using 1215 in-situ samples to estimate particulate composition (Organic Suspended Matter/Total Suspended Matter, OSM/TSM). The study further explored the intra-annual and inter-annual variability of OSM/TSM using General Linear Model(GLM) and Partial Least Squares Structural Equation Modeling (PLS-SEM), and examined its linkages by analyzing the covariation between OSM/TSM and submerged vegetation (SV) in Erhai from 2000 to 2024.

New hydrological insights

The OSM/TSM algorithm demonstrated satisfactory performance (R²=0.71, RMSE=0.14, UMAPE= 31.23 %). Results showed that Urban lakes exhibited 1.3 times higher annual mean OSM/TSM than natural lakes, with all lakes exhibiting consistent seasonal peaks during the summer and autumn. A weak but consistent long-term declining trend in OSM/TSM (-0.003 yr⁻¹) was observed across most lakes, except for Dianchi and Yangzonghai. GLM analysis revealed that wind speed was the dominant factor driving intra-annual OSM/TSM variability, accounting for 45.58 ± 15.94 %. PLS-SEM results indicated that climate factors were the primary inter-annual driving in natural and semi-urban lakes, while human activity, such as lake expansion and nighttime light, dominated in urban lakes. OSM/TSM was shown to be a potential influencing factor for the growth of submerged vegetation.

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来源期刊

Journal of Hydrology-Regional Studies Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)

CiteScore

6.70

自引率

8.50%

发文量

284

审稿时长

60 days

期刊介绍： Journal of Hydrology: Regional Studies publishes original research papers enhancing the science of hydrology and aiming at region-specific problems, past and future conditions, analysis, review and solutions. The journal particularly welcomes research papers that deliver new insights into region-specific hydrological processes and responses to changing conditions, as well as contributions that incorporate interdisciplinarity and translational science.