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Spatio-temporal Patterns of the Net Primary Productivity in Southern Himalayas During 2001-2015
Nan Xi1; Li Ainong1; Zhao Wei1; Bian Jinhu1,3; Jin Huaan1; Deng Wei2; Koirala Hriday Lal4
EditorLi A ; Deng W ; Zhao W
Publication PlaceSingapore
KeywordNPP Time-series analysis 4.25 earthquake Nepal Remote sensing
Indexed ByBKCI-S
AbstractVegetation in southern Himalayas is susceptible to both extrinsic (e.g., climate change) and intrinsic (e.g., earthquakes) factors. Analysis of spatio-temporal patterns and variability of net primary productivity (NPP) help to understand ecological functioning in this area. Based on MODIS net primary productivity data (MOD17A3H), we investigated the spatial distribution of NPP values and its spatio-temporal variation in southern Himalayas during 2001-2015 with the methods of gross statistics, correlation analysis and spatial statistics. The impacts of the Nepal Ms8.1 earthquake in April 2015 were also analyzed. The results indicate that: (1) in the past 15 years, NPP in southern Himalayas maintains a growth trend in general, with an average amount of 1.60 g Cm-2 a(-1), while the tendency appears negative at lower altitudes below 1000 m, and positive in the mid-altitude areas and above; (2) NPP in southern Himalayas is characterized by vertical altitudinal belts, among which, NPP reaches to a maximum at the altitude of 1200-2700 m with an average of about 800 g Cm-2 a(-1); (3) The average NPP values of evergreen broad-leaved forest, deciduous forest, coniferous forest, grassland, sparse vegetation in southern Himalayas were 835.0, 711.6, 623.9, 144.8, 25.5 g Cm-2 a(-1), respectively, and their average growth rates are 5.08, 2.17, 1.135, 0.7086, 0.22 g Cm-2 a(-1); (4) Along the major axis of high seismic intensive region, anomalous decreases of NPP could be found in a period of five years before earthquake (from 2010 to 2014). There is a positive correlation between these anomalous areas and average temperatures, but negative correlation with rainfall, which suggests that anomalous decrease of NPP may correlate with tectonic activity before the earthquake occurs.
ISBN978-981-10-2890-8; 978-981-10-2889-2
WOS IDWOS:000432241500009
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type专著章节文集论文
Corresponding AuthorLi Ainong
Affiliation1.Research Center for Digital Mountain and Remote Sensing Application, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, China;
2.Research Center for Mountain Development, Institute of Mountain Hazards and EnvironmentChinese Academy of Sciences, Chengdu, China;
3.Department of Geographical SciencesUniversity of Maryland, College Park, USA;
4.Central Department of Geography, Tribhuvan University, Kirtipur, Kathmandu, Nepal
Recommended Citation
GB/T 7714
Nan Xi,Li Ainong,Zhao Wei,et al. Spatio-temporal Patterns of the Net Primary Productivity in Southern Himalayas During 2001-2015. LAND COVER CHANGE AND ITS ECO-ENVIRONMENTAL RESPONSES IN NEPAL. Singapore:SPRINGER,2017:185-201.
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