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| Evaluating Vegetation Health Condition Using
MODIS Data in the Three Gorges Area, China |
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韩贵锋1, 谢雨丝2, 蔡 智2
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1.Associate Professor , Key
Laboratory of New Technology for Construction
of Cities in Mountain Area of Education
Ministry, College of Architecture and Urban
Planning, Chongqing University, hangf@cqu.
edu.cn;2.Postgraduate, College of Architecture
and Urban Planning, Chongqing University
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| 摘要: |
| The satellite-based vegetation condition index (VCI) and temperature condition
index (TCI) have been used extensively for drought detection and tracking, the assessment of
weather impacts on vegetation and evaluation of the health and productivity of vegetation. In
this study, in order to detect and monitor the growth condition of vegetation, we have collected
data on vegetation indices and land surface temperature derived from MODIS (2001-2012)
and defined a vegetation health index (VHI) based on VCI and TCI for assessing vegetation
health condition in the Three Gorges Area, China (TGA). The results of the study show that
temporal and spatial characteristics of vegetation health condition can be detected, tracked and
mapped by the VHI index. In most parts of the TGA, the vegetation health condition showed
an overall increasing trend during the study period, especially in Wulong, Fengdu, Shizhu and
other regions located in the midstream sections of the Three Gorges Reservoir. In addition,
the four studied vegetation types all showed clear increasing trends during the study period.
The increasing trend in the vegetation health condition shows a strong positive correlation
with topographical slope and altitude (below 500 m). Over the seasons, this trend is strongest
in autumn, followed by spring. However, the correlations between vegetation health condition
and climatic factors are more frequently significant in summer and winter than in autumn
and spring. The vegetation health condition has been low in 2006 and 2011. This finding
is consistent with the extreme weather conditions in those two years. However, only in the
summer is vegetation health condition significantly correlated with three climatic factors in
most of the study area. This result implies that vegetation growth may show a lagged response
to climatic factors and may also be affected by human activities, including agricultural
activities, industrial activities and other economic activities. |
| 关键词: Vegetation Health Condition Vegetation Condition Index Temperature Condition
Index Time Series Images Three Gorges Area |
| DOI：10.13791/j.cnki.hsfwest.20150223 |
| 分类号: |
| 基金项目:Natural Science Foundation Project of CQ
CSTC (CSTC2011jjA00025) |
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| Evaluating Vegetation Health Condition UsingMODIS Data in the Three Gorges Area, China |
|
HAN Guifeng,XIE Yusi,CAI Zhi
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| Abstract: |
| The satellite-based vegetation condition index (VCI) and temperature condition
index (TCI) have been used extensively for drought detection and tracking, the assessment of
weather impacts on vegetation and evaluation of the health and productivity of vegetation. In
this study, in order to detect and monitor the growth condition of vegetation, we have collected
data on vegetation indices and land surface temperature derived from MODIS (2001-2012)
and defined a vegetation health index (VHI) based on VCI and TCI for assessing vegetation
health condition in the Three Gorges Area, China (TGA). The results of the study show that
temporal and spatial characteristics of vegetation health condition can be detected, tracked and
mapped by the VHI index. In most parts of the TGA, the vegetation health condition showed
an overall increasing trend during the study period, especially in Wulong, Fengdu, Shizhu and
other regions located in the midstream sections of the Three Gorges Reservoir. In addition,
the four studied vegetation types all showed clear increasing trends during the study period.
The increasing trend in the vegetation health condition shows a strong positive correlation
with topographical slope and altitude (below 500 m). Over the seasons, this trend is strongest
in autumn, followed by spring. However, the correlations between vegetation health condition
and climatic factors are more frequently significant in summer and winter than in autumn
and spring. The vegetation health condition has been low in 2006 and 2011. This finding
is consistent with the extreme weather conditions in those two years. However, only in the
summer is vegetation health condition significantly correlated with three climatic factors in
most of the study area. This result implies that vegetation growth may show a lagged response
to climatic factors and may also be affected by human activities, including agricultural
activities, industrial activities and other economic activities. |
| Key words: Vegetation Health Condition Vegetation Condition Index Temperature Condition
Index Time Series Images Three Gorges Area |
