Satellite solar-induced chlorophyll fluorescence and near-infrared reflectance capture complementary aspects of dryland vegetation productivity dynamics

环境科学 归一化差异植被指数 初级生产 中分辨率成像光谱仪 生态系统 光化学反射率指数 增强植被指数 大气科学 常绿 涡度相关法 叶面积指数 陆地生态系统 植被(病理学) 碳汇 碳循环 遥感 卫星 生态学 地理 地质学 植被指数 医学 病理 工程类 生物 航空航天工程
作者
Xian Wang,Joel A. Biederman,John F. Knowles,Russell L. Scott,Alexander J. Turner,Matthew P. Dannenberg,Philipp Köhler,Christian Frankenberg,M. E. Litvak,G. N. Flerchinger,B. E. Law,Hyojung Kwon,Sasha C. Reed,William J. Parton,G. Barron-Gafford,William K. Smith
出处
期刊:Remote Sensing of Environment [Elsevier]
卷期号:270: 112858-112858 被引量:58
标识
DOI:10.1016/j.rse.2021.112858
摘要

Mounting evidence indicates dryland ecosystems play an important role in driving the interannual variability and trend of the terrestrial carbon sink. Nevertheless, our understanding of the seasonal dynamics of dryland ecosystem carbon uptake through photosynthesis [gross primary productivity (GPP)] remains relatively limited due in part to the limited availability of long-term data and unique challenges associated with satellite remote sensing across dryland ecosystems. Here, we comprehensively evaluated longstanding and emerging satellite vegetation proxies in their ability to capture seasonal dryland GPP dynamics. Specifically, we evaluated: 1) reflectance-based proxies normalized difference vegetation index (NDVI), soil adjusted vegetation index (SAVI), near infrared reflectance index (NIRv), and kernel NDVI (kNDVI) from the MODerate resolution Imaging Spectroradiometer (MODIS); and 2) newly available physiologically-based proxy solar-induced chlorophyll fluorescence (SIF) from the TROPOspheric Monitoring Instrument (TROPOMI). As a performance benchmark, we used GPP estimates from a robust network of 21 western United States eddy covariance tower sites that span representative gradients in dryland ecosystem climate and functional composition. We found that NIRv and SIF were the best performing GPP proxies and captured complementary aspects of seasonal GPP dynamics across dryland ecosystem types. NIRv offered better performance than the other proxies across relatively low-productivity, sparsely non-evergreen vegetated sites (R2 = 0.59 ± 0.13); whereas SIF best captured seasonal dynamics across relatively high-productivity sites, including evergreen-dominated sites (R2 = 0.74 ± 0.07). Notably, across grass-dominated sites, all reflectance-based proxies (NDVI, SAVI, NIRv and kNDVI) showed significant seasonal bias (hysteresis) that strengthened with the total fraction of woody vegetation cover, likely due to seasonal patterns in woody vegetation reflectance that are unrelated to or decoupled from GPP. Future efforts to fully integrate the complementary strengths of NIRv and SIF could significantly improve our understanding and representation of dryland GPP dynamics in satellite-based models.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
大幅提高文件上传限制,最高150M (2024-4-1)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
我是老大应助Mr采纳,获得10
刚刚
刚刚
懒羊羊完成签到 ,获得积分10
1秒前
CHANG发布了新的文献求助10
1秒前
大方月亮完成签到,获得积分10
1秒前
JamesPei应助LYH采纳,获得10
1秒前
2秒前
BohanHou发布了新的文献求助10
2秒前
wanci应助怕黑的小蘑菇采纳,获得10
2秒前
3秒前
3秒前
小贱人完成签到,获得积分10
3秒前
Yee关注了科研通微信公众号
3秒前
wanci应助甜蜜雅彤采纳,获得10
3秒前
HongJiang完成签到,获得积分10
5秒前
surong发布了新的文献求助10
5秒前
6秒前
7秒前
肖兔兔完成签到,获得积分10
7秒前
周老八发布了新的文献求助10
8秒前
9秒前
BohanHou完成签到,获得积分10
11秒前
12秒前
X123完成签到,获得积分10
14秒前
热心市民小红花应助QhL采纳,获得10
14秒前
Paddi发布了新的文献求助10
15秒前
Hello应助Hulda采纳,获得30
15秒前
淡然天问完成签到 ,获得积分20
17秒前
17秒前
LYH发布了新的文献求助10
18秒前
夏清小山羊完成签到,获得积分10
19秒前
愉快天亦完成签到,获得积分10
19秒前
19秒前
共享精神应助科研通管家采纳,获得10
20秒前
20秒前
田様应助科研通管家采纳,获得10
20秒前
完美世界应助科研通管家采纳,获得30
20秒前
领导范儿应助科研通管家采纳,获得10
20秒前
20秒前
大模型应助科研通管家采纳,获得10
20秒前
高分求助中
Sustainability in Tides Chemistry 2000
The ACS Guide to Scholarly Communication 2000
Studien zur Ideengeschichte der Gesetzgebung 1000
TM 5-855-1(Fundamentals of protective design for conventional weapons) 1000
Threaded Harmony: A Sustainable Approach to Fashion 810
Pharmacogenomics: Applications to Patient Care, Third Edition 800
Gerard de Lairesse : an artist between stage and studio 500
热门求助领域 (近24小时)
化学 医学 生物 材料科学 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 基因 遗传学 催化作用 物理化学 免疫学 量子力学 细胞生物学
热门帖子
关注 科研通微信公众号,转发送积分 3076389
求助须知:如何正确求助?哪些是违规求助? 2729242
关于积分的说明 7508108
捐赠科研通 2377477
什么是DOI,文献DOI怎么找? 1260632
科研通“疑难数据库(出版商)”最低求助积分说明 611101
版权声明 597194