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(Upload on January 11 2018) [ 日本語 | English ]

Introcution to global warming (地球温暖化総論)

Ozone depletion and the effects of UV radiation (オゾン層破壊と紫外線影響評価総論)




Mount Usu / Sarobetsu post-mined peatland
From left: Crater basin in 1986 and 2006. Cottongrass / Daylily

[ References / Link | Environmental earth science ]

Introcution to global warming (地球温暖化総論)


Objectives of this lecture (conducted duirng 2004 and 2010)

Large-scaled environmental fluctuations derive various effects on biosphere, including various-sized organisms from unicellular microorganisms to large animals and plants. To clarify the responses of ecosystems to environments, it is prerequisite to research and analyze various temporal and spatial scales. Based on the consideration of those scales, we focus on terrestrial and oceanic plant communities and learn the response of ecosystems to global warming and the feedback to the environments.
Related lectures
Global warming ecology ( 温暖化生態学特論 )
Advanced course in environmental conservation (環境保全特論)
Introduction to ozone depletion and the effect of UV (自然環境学総論)

ecosystem
biome: temperature and precipitation
(human) disturbance

scale-dependence on disturbances

greenhosue effect and refrigerator effect
interactions between environments and between environments and ecosystems
interactions between environments and between environments and ecosystems
taiga and forest fire

Regeneration after wildfire in Alaska P
multi-dimensional scaling (MDS)

Space and time
Small scale
Manipulation
experimental warming

field greenhouse
passive open-top chamber
active open-top chamber
active soil warming
electric infrared heat
reciprocal or one-way transplantation

Measurments of ecosystem changes by warming experiments

perennial plants
annual plants
and … belowground
negative feedbak

Topic: methane emissions from terrestrial plants under aerobic conditions

Large (global) scale
To understand the followings, read references
Distribution

single factor (Ex. temperature only)
two factors (Ex. temperature and precipitation)
multiple factors
application to ecosystem changes by global warming
there are many controversial subjects

remote sensing and GIS
general reflection patterns of plants, soil, and water
vegetation index
normalized difference vegetation index (NDVI)

seasonal changes in NDVI
temperal changes of NDVI on Mount Pinatubo
[Mudflows on the volcano Mount Pinatubo, Philippines]
seasonal changes in NDVI in the world
distribution of biome, evaluated by NDVI
geographic information system

photosynthesis

6CO2 + 12H2O → C6H12O6 + 6O2 + 6H2O
It may be no exaggeration to say that this equation tells all.

GPP and NPP: primary productivity (gross primary productivity and net primary productivity)
estimation of primary productivity by satellite data

absorbed photosynthetically active radiation, APAR
average light utilization efficiency, ε
NPP = (APAR)·ε

Productivity

Ozone depletion and the effects of UV radiation (オゾン層破壊と紫外線影響評価総論)


Effects of ultraviolet (紫外線影響)


UV, X-ray = 200-295 nm

260 nm – DNA, RNA
285 nm – Thymine, Cytosine, FT, C-C and T-C dimer

repair

UV exposure is utlized for making bacterial mutants - mutation rate is maximum when the survival is 1-2%

Two types of repairment

1) Photoreactivation
2) Dark repair
repair

Content of lecture


Introduction
plant community
flora

Ex. Mount Koma
flora list on Mount Koma

physiognomy

leaf colors in spring with reference to UV
life-form
Raunkiaer's life-form spectra

distribution correlated with environment
spatial and temporal changes in ecosystems

toposequence

photosynthesis

wavelengths that are used for photosynthesis

ecosystem
biome
environment

temperature
precipitation
scale-dependent environmental factor

food web and trophic levels

Arctic
Antarctic

ultraviolet (UV) and terrestrial plants

responses of plants to UV

flavon - UV-absorbing substances
avoidance
protection
repair

secondary metabolites

Ex. nicotine
functions of secondary metabolites
for field trainings: Aconitum yezoense, Rhus ambigua and Urtica platyphylla)

lab-experiments: advantages and disadvantages
Spring extrapolation - risky
repairment by visible light
mycorrhizal fungi and plants
the way to understand ecosystem responses to UV
effects of UV on mycorrhizal fungi
interactions between mychorrhizal fungi and plants
responses of plants changed by UV
litter decomposition and UV: photodegradation and microbial decomposition
field experiment
Responses of Grimmia antarctici Card on UV
meta-analysis
principles of meta-analysis
meta-analysis of the effects of UV on plant responses
meta-analysis of the responses of plants to UV in the Arctic
the schema of ecosystem chanegs induced by climate changes, including UV - no numerals now
the present status of UV in Australia
people living closer to the Antarctic have stronger crisis awareness. Therefore, the researches on the effects of UV on ecosystems and lives are conducted well in Australia, South Africa and countries of South America.

recognizing differences between ocean and land
prediction of temporal UV changes in Australia
system of UV surveillance in South Australia
ultraviolet forecast
TV commercial (skin cancer)
Slip! Slop! Slap!No hat, No play
However, …, as it is, one scene in Western Australia

Cooperation
Relationships between scientists, officials, mass media and people expressed by a trigonal pyramid

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