Defining phenology events with digital repeat photography

Phenology is the study of the timing of natural events such as leaf-out, bud burst and senescence relative to climate change. It is important to understand how the climate change will affect the timing of these events as it in turn affects the carbon-, nutrient- and the hydrological cycles. Field ob...

Full description

Bibliographic Details
Main Author: Jonsson, Johannes
Format: Other/Unknown Material
Language:English
Published: Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap 2012
Subjects:
Online Access:http://lup.lub.lu.se/student-papers/record/2797262
id ftulundlupsp:oai:lup-student-papers.lub.lu.se:2797262
record_format openpolar
spelling ftulundlupsp:oai:lup-student-papers.lub.lu.se:2797262 2023-07-30T03:55:22+02:00 Defining phenology events with digital repeat photography Jonsson, Johannes 2012 application/pdf http://lup.lub.lu.se/student-papers/record/2797262 eng eng Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap http://lup.lub.lu.se/student-papers/record/2797262 geography physical geography digital repeat photography phenology mountain birch geografi naturgeografi fenologi fjällbjörk Earth and Environmental Sciences M2 2012 ftulundlupsp 2023-07-11T20:06:29Z Phenology is the study of the timing of natural events such as leaf-out, bud burst and senescence relative to climate change. It is important to understand how the climate change will affect the timing of these events as it in turn affects the carbon-, nutrient- and the hydrological cycles. Field observations is the most common way to gather phenology data but the result is dependent on the skill of the observer and is very time consuming. Remote sensing has under the last decades been used more in phenology studies. However the low spatial and temporal resolution from satellite photos makes it hard to study local phenology. Therefore new methods have emerged to complement this. Digital repeat photography is a method which uses regular digital cameras mounted to capture the same area over a longer time period. The captured red, green and blue color values in the photographs can then be used to calculate the appearance of certain phenology events. This study provides a method how to quantitatively define the start and end of the growing season which can be used to indicate climate change. Phenology phases for four different mountain birch stands including canopy and understory in Abisko, Sweden, were studied using data from 2011. The calculated start of the growing season varied with two days between the different stands and follows the field observed phenology. The calculated color values from the photographs had a peak when all leaves were fully developed. The end of the growing season varied by six days between all birch stands. The senescence period was harder to define than the leaf-out event as it includes both the decrease from the colorization of leaves and when leaves fall to the ground. Populärvetenskaplig sammanfattning Fenologi innebär studier av naturligt återkommande händelser som till exempel bladsprickning, knoppbristning och vissningen av blad. Det är viktigt att förstå hur klimatförändringen påverkar tidpunkten då dessa händelser sker eftersom det i sin tur påverkar kol-, närings- och den ... Other/Unknown Material Abisko Lund University Publications Student Papers (LUP-SP) Abisko ENVELOPE(18.829,18.829,68.349,68.349) Kol’ ENVELOPE(155.946,155.946,53.834,53.834)
institution Open Polar
collection Lund University Publications Student Papers (LUP-SP)
op_collection_id ftulundlupsp
language English
topic geography
physical geography
digital repeat photography
phenology
mountain birch
geografi
naturgeografi
fenologi
fjällbjörk
Earth and Environmental Sciences
spellingShingle geography
physical geography
digital repeat photography
phenology
mountain birch
geografi
naturgeografi
fenologi
fjällbjörk
Earth and Environmental Sciences
Jonsson, Johannes
Defining phenology events with digital repeat photography
topic_facet geography
physical geography
digital repeat photography
phenology
mountain birch
geografi
naturgeografi
fenologi
fjällbjörk
Earth and Environmental Sciences
description Phenology is the study of the timing of natural events such as leaf-out, bud burst and senescence relative to climate change. It is important to understand how the climate change will affect the timing of these events as it in turn affects the carbon-, nutrient- and the hydrological cycles. Field observations is the most common way to gather phenology data but the result is dependent on the skill of the observer and is very time consuming. Remote sensing has under the last decades been used more in phenology studies. However the low spatial and temporal resolution from satellite photos makes it hard to study local phenology. Therefore new methods have emerged to complement this. Digital repeat photography is a method which uses regular digital cameras mounted to capture the same area over a longer time period. The captured red, green and blue color values in the photographs can then be used to calculate the appearance of certain phenology events. This study provides a method how to quantitatively define the start and end of the growing season which can be used to indicate climate change. Phenology phases for four different mountain birch stands including canopy and understory in Abisko, Sweden, were studied using data from 2011. The calculated start of the growing season varied with two days between the different stands and follows the field observed phenology. The calculated color values from the photographs had a peak when all leaves were fully developed. The end of the growing season varied by six days between all birch stands. The senescence period was harder to define than the leaf-out event as it includes both the decrease from the colorization of leaves and when leaves fall to the ground. Populärvetenskaplig sammanfattning Fenologi innebär studier av naturligt återkommande händelser som till exempel bladsprickning, knoppbristning och vissningen av blad. Det är viktigt att förstå hur klimatförändringen påverkar tidpunkten då dessa händelser sker eftersom det i sin tur påverkar kol-, närings- och den ...
format Other/Unknown Material
author Jonsson, Johannes
author_facet Jonsson, Johannes
author_sort Jonsson, Johannes
title Defining phenology events with digital repeat photography
title_short Defining phenology events with digital repeat photography
title_full Defining phenology events with digital repeat photography
title_fullStr Defining phenology events with digital repeat photography
title_full_unstemmed Defining phenology events with digital repeat photography
title_sort defining phenology events with digital repeat photography
publisher Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap
publishDate 2012
url http://lup.lub.lu.se/student-papers/record/2797262
long_lat ENVELOPE(18.829,18.829,68.349,68.349)
ENVELOPE(155.946,155.946,53.834,53.834)
geographic Abisko
Kol’
geographic_facet Abisko
Kol’
genre Abisko
genre_facet Abisko
op_relation http://lup.lub.lu.se/student-papers/record/2797262
_version_ 1772819043593486336