Driving mechanisms of gross primary productivity geographical patterns for Qinghai-Tibet Plateau lake systems

作     者：Jia, Junjie Wang, Yafeng Lu, Yao Sun, Kun Lyu, Sidan Gao, Yang 

作者机构：Chinese Acad Sci Inst Geog Sci & Nat Resources Res Key Lab Ecosystem Network Observat & Modeling Beijing 100101 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China Chinese Acad Sci Inst Tibetan Plateau Res Key Lab Alpine Ecol Beijing 100101 Peoples R China 

出 版 物：《SCIENCE OF THE TOTAL ENVIRONMENT》 (整体环境科学)

年 卷 期：2021年第791卷

页      面：148286-148286页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：National Nature Science Foundation of China [31988102, 41971134, 41922003] Second Tibetan Plateau Scientific Expedition and Research Program [2019QZKK060602] 

主　　题：Gross primary productivity (GPP) Alpine lakes Altitude Salinity Climatic change Qinghai-Tibet Plateau (QTP) 

摘      要：Being a fundamental property of aquatic systems, gross primary productivity (GPP) is affected by complex environmental factors, such as salinity, nutrients, pH, and sunlight. Under conditions of intensified anthropogenic activity and climate change, it is critical to understand the driving mechanisms of GPP in alpine lakes. In this study, we investigated GPP and associated environmental factors of 23 lake systems in the Qinghai-Tibet Plateau (QTP) along an altitudinal range (from 2500 m to 4500 m). Results showed an increase in chlorophyll a (Chl a) content as altitude increased and a corresponding decrease as salinity increased. Furthermore, geographical patterns of GPP were higher at the mid-gradient and lower at the extreme gradient. Higher solar radiation and water temperatures, stronger evaporation and higher salinity levels, and lower pH and higher nutrient content were all driving mechanisms of GPP in low altitudinal lake systems within high latitudinal regions. Such conditions have collectively resulted in the current GPP pattern via the promotion or inhibition of phytoplankton growth and photosynthesis. Specifically, geographical features and climate change jointly drive algal growth and GPP of alpine lake systems via internal circulation processes;however, anthropogenic activities interfere with external circulation processes for most of lower-middle altitudinal lake systems, thus playing a certain role in regulating environmental factors and GPP alongside climate change. (c) 2021 Elsevier B.V. All rights reserved.