Spatial and seasonal variability of chlorophyll a in different-sized lakes across eastern China

IF 2.7 3区环境科学与生态学 Q1 LIMNOLOGY

Inland Waters Pub Date : 2021-11-11 DOI:10.1080/20442041.2021.1970462

Z. Cao, J. Melack, Miao Liu, H. Duan, R. Ma

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引用次数: 4

Abstract

ABSTRACT Chlorophyll a (Chl-a) in lakes is an indicator of phytoplankton biomass and widely employed in lake management. Here, we used Chl-a data from 586 lakes ≥1 km2 in eastern China from 2013 to 2018 derived from the Operational Land Imager (OLI) onboard the Landsat-8 satellite to examine influences of climatic and anthropogenic factors on Chl-a variations among these lakes, partitioned into groups of different sizes. The results indicate that Chl-a values in small lakes (1–50 km2) were higher than those in large lakes (>50 km2), and the mean Chl-a in summer and autumn was higher than in spring and winter. Air temperature was positively correlated with the seasonal mean Chl-a in all sizes of lakes. Small lakes had a larger cropland proportion in their watersheds than large lakes, suggesting that the higher cropland proportion of the land cover contributed to the high Chl-a of these lakes. This research highlights the merit of high spatial resolution remote sensing for monitoring lakes in a regional context and indicates that the management of lakes could benefit from controlling agricultural activities in their watersheds.

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中国东部不同大小湖泊叶绿素a的空间和季节变化

摘要湖泊中的叶绿素a（Chl-a）是浮游植物生物量的指标，在湖泊管理中得到了广泛应用。在这里，我们使用了586个≥1的湖泊的Chl-a数据 根据陆地卫星8号卫星上的陆地成像仪（OLI），研究气候和人为因素对这些湖泊中叶绿素a变化的影响，将这些湖泊划分为不同大小的组。结果表明，小型湖泊中的Chl-a值（1–50 km2）高于大湖（＞50 km2），夏季和秋季的平均Chl-a高于春季和冬季。在各种大小的湖泊中，气温与季节平均叶绿素a呈正相关。小型湖泊在其流域中的耕地比例高于大型湖泊，这表明耕地在土地覆盖中的比例越高，这些湖泊的叶绿素a含量越高。这项研究强调了高空间分辨率遥感在区域范围内监测湖泊的优点，并表明湖泊管理可以从控制流域内的农业活动中受益。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Inland Waters LIMNOLOGY-MARINE & FRESHWATER BIOLOGY

CiteScore

6.10

自引率

9.70%

发文量

审稿时长

>12 weeks

期刊介绍： Inland Waters is the peer-reviewed, scholarly outlet for original papers that advance science within the framework of the International Society of Limnology (SIL). The journal promotes understanding of inland aquatic ecosystems and their management. Subject matter parallels the content of SIL Congresses, and submissions based on presentations are encouraged. All aspects of physical, chemical, and biological limnology are appropriate, as are papers on applied and regional limnology. The journal also aims to publish articles resulting from plenary lectures presented at SIL Congresses and occasional synthesis articles, as well as issues dedicated to a particular theme, specific water body, or aquatic ecosystem in a geographical area. Publication in the journal is not restricted to SIL members.