Outgoing Near-Infrared Radiation From Vegetation Scales With Canopy Photosynthesis Across a Spectrum of Function, Structure, Physiological Capacity, and Weather

被引：99

作者：

Baldocchi, Dennis D. ^{[1
]}

Ryu, Youngryel ^{[2
]}

Dechant, Benjamin ^{[2
]}

Eichelmann, Elke ^{[1
]}

Hemes, Kyle ^{[1
]}

Ma, Siyan ^{[1
]}

Sanchez, Camilo Rey ^{[1
]}

Shortt, Robert ^{[1
]}

Szutu, Daphne ^{[1
]}

Valach, Alex ^{[1
]}

Verfaillie, Joe ^{[1
]}

Badgley, Grayson ^{[3
]}

Zeng, Yelu ^{[3
]}

Berry, Joseph A. ^{[3
]}

机构：

[1] Univ Calif Berkeley, Dept Environm Sci Policy & Management, Berkeley, CA 94720 USA

[2] Seoul Natl Univ, Dept Landscape Architecture & Rural Syst Engn, Seoul, South Korea

[3] Carnegie Inst Sci, Dept Global Ecol, Stanford, CA USA

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES | 2020年 / 125卷 / 07期

基金：

新加坡国家研究基金会;

关键词：

remote sensing; eddy covariance; leaf area index; near-infrared radiation; Ameriflux; INDUCED CHLOROPHYLL FLUORESCENCE; GROSS PRIMARY PRODUCTION; CARBON-DIOXIDE EXCHANGE; NET ECOSYSTEM EXCHANGE; LIGHT USE EFFICIENCY; LEAF-AREA INDEX; TERRESTRIAL BIOSPHERE; STOMATAL CONDUCTANCE; FLUX MEASUREMENTS; SEASONAL TRENDS;

D O I：

10.1029/2019JG005534

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

We test the relationship between canopy photosynthesis and reflected near-infrared radiation from vegetation across a range of functional (photosynthetic pathway and capacity) and structural conditions (leaf area index, fraction of green and dead leaves, canopy height, reproductive stage, and leaf angle inclination), weather conditions, and years using a network of field sites from across central California. We based our analysis on direct measurements of canopy photosynthesis, with eddy covariance, and measurements of reflected near-infrared and red radiation from vegetation, with light-emitting diode sensors. And we interpreted the observed relationships between photosynthesis and reflected near-infrared radiation using simulations based on the multilayer, biophysical model, CanVeg. Measurements of reflected near-infrared radiation were highly correlated with measurements of canopy photosynthesis on half-hourly, daily, seasonal, annual, and decadal time scales across the wide range of function and structure and weather conditions. Slopes of the regression between canopy photosynthesis and reflected near-infrared radiation were greatest for the fertilized and irrigated C(4)corn crop, intermediate for the C(3)tules on nutrient-rich organic soil and nitrogen fixing alfalfa, and least for the native annual grasslands and oak savanna on nutrient-poor, mineral soils. Reflected near-infrared radiation from vegetation has several advantages over other remotely sensed vegetation indices that are used to infer canopy photosynthesis; it does not saturate at high leaf area indices, it is insensitive to the presence of dead legacy vegetation, the sensors are inexpensive, and the reflectance signal is strong. Hence, information on reflected near-infrared radiation from vegetation may have utility in monitoring carbon assimilation in carbon sequestration projects or on microsatellites orbiting Earth for precision agriculture applications.

引用

页数：17

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