Phenological mapping in a topographically complex landscape by
combining field survey with an irradiation model

J 1998

Phenological mapping in a topographically complex landscape by combining field survey with an irradiation model

CHYTRÝ, Milan a Lubomír TICHÝ

Základní údaje

Originální název

Phenological mapping in a topographically complex landscape by combining field survey with an irradiation model

Autoři

CHYTRÝ, Milan (203 Česká republika) a Lubomír TICHÝ (203 Česká republika)

Vydání

Applied Vegetation Science, Uppsala, Opulus Press, 1998, 1402-2001

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10600 1.6 Biological sciences

Stát vydavatele

Švédsko

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Kód RIV

RIV/00216224:14310/98:00000707

Organizační jednotka

Přírodovědecká fakulta

UT WoS

000208471900008

Změněno: 24. 9. 2004 18:36, prof. RNDr. Milan Chytrý, Ph.D.

Anotace

V originále

A phenological map has been prepared for the Podyjí/Thayatal National Park, located on the border between the Czech Republic and Austria. The area is characterized by V-shaped river valleys deeply incised into a gently undulating landscape. Five stages of phenological development were defined based upon phenological spectra of plant communities in late April, and 96 sites more or less regularly spaced over the area were assigned to one of these stages using field observations of the phenological spectra. Potential direct solar irradiation was calculated from a digital elevation model for a 25 x 25 m grid extending over the study area. A method was developed for interpolation of phenological observations by weighted regression of phenology on the irradiation model. This interpolation method makes it possible to predict the local stage of phenological development everywhere across the study area without levelling out phenological patterns dependent upon small-scale topographic variation. The mapping has shown that spring phenological events are more advanced in the valleys (except for steep north-facing slopes with low sunshine duration) than in the adjacent landscape. Possible climatic processes underlying this pattern are discussed with special emphasis on temperature inversions in the river valleys. The cold-air-drainage inversions reported from the valleys are probably too infrequent and short to delay phenological events in plants. The combined effects of advanced phenology and the increased risk of spring frost injury due to cold-air-drainage inversions in the valleys are suggested as a possible explanation for some local distributional patterns of flora and vegetation.

Návaznosti

GA206/96/0131, projekt VaV

Název: Diverzita vegetace a flóry říčních údolí: modelování vlivu abiotických faktorů

Investor: Grantová agentura ČR, Diverzita vegetace a flóry říčních údolí: modelování vlivu abiotických faktorů

Citovat

CHYTRÝ, Milan a Lubomír TICHÝ. Phenological mapping in a topographically complex landscape by combining field survey with an irradiation model. Applied Vegetation Science. Uppsala: Opulus Press, 1998, roč. 1, č. 2, s. 225-232. ISSN 1402-2001.

@article{198704,
   author = {Chytrý, Milan and Tichý, Lubomír},
   article_location = {Uppsala},
   article_number = {2},
   language = {eng},
   issn = {1402-2001},
   journal = {Applied Vegetation Science},
   title = {Phenological mapping in a topographically complex landscape by combining field survey with an irradiation model},
   url = {http://www.sci.muni.cz/botany/chytry/AVS1998b.pdf},
   volume = {1},
   year = {1998}
}

TY  - JOUR
ID  - 198704
AU  - Chytrý, Milan - Tichý, Lubomír
PY  - 1998
TI  - Phenological mapping in a topographically complex landscape by combining field survey with an irradiation model
JF  - Applied Vegetation Science
VL  - 1
IS  - 2
SP  - 225
EP  - 225
PB  - Opulus Press
SN  - 14022001
UR  - http://www.sci.muni.cz/botany/chytry/AVS1998b.pdf
N2  - A phenological map has been prepared for the Podyjí/Thayatal National Park, located on the border between the Czech Republic and Austria. The area is characterized by V-shaped river valleys deeply incised into a gently undulating landscape. Five stages of phenological development were defined based upon phenological spectra of plant communities in late April, and 96 sites more or less regularly spaced over the area were assigned to one of these stages using field observations of the phenological spectra. Potential direct solar irradiation was calculated from a digital elevation model for a 25 x 25 m grid extending over the study area. A method was developed for interpolation of phenological observations by weighted regression of phenology on the irradiation model. This interpolation method makes it possible to predict the local stage of phenological development everywhere across the study area without levelling out phenological patterns dependent upon small-scale topographic variation. The mapping has shown that spring phenological events are more advanced in the valleys (except for steep north-facing slopes with low sunshine duration) than in the adjacent landscape. Possible climatic processes underlying this pattern are discussed with special emphasis on temperature inversions in the river valleys. The cold-air-drainage inversions reported from the valleys are probably too infrequent and short to delay phenological events in plants. The combined effects of advanced phenology and the increased risk of spring frost injury due to cold-air-drainage inversions in the valleys are suggested as a possible explanation for some local distributional patterns of flora and vegetation.
ER  -

CHYTRÝ, Milan a Lubomír TICHÝ. Phenological mapping in a topographically complex landscape by combining field survey with an irradiation model. \textit{Applied Vegetation Science}. Uppsala: Opulus Press, 1998, roč.~1, č.~2, s.~225-232. ISSN~1402-2001.

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