Dr. Lin Chu Profile

Dr. Lin Chu

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Proceedings Article | 8 November 2014 Paper

Analysis on vegetation changes of Maqu alpine wetlands in the Yellow River source region

Lin Chu, Chong Huang, Gaohuan Liu, Qingsheng Liu, Jun Zhao

Proceedings Volume 9260, 92602O (2014) https://doi.org/10.1117/12.2068521

KEYWORDS: Vegetation, Climatology, Climate change, Soil science, Meteorology, Temperature metrology, Landsat, Ecosystems, Statistical analysis, Earth observing sensors

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The Maqu alpine wetlands have irreplaceable function in maintaining ecological balance and conserving biodiversity to the upriver regions of the Yellow River. In last 30 years, Global warming causes significant changes in vegetation. However, the Maqu alpine wetland is undergoing a degradation caused by warming and drying climate. Aim of this study is to investigate the vegetation changes for a better understanding the consequence of climate variations to the wetland degradation. Based on the Landsat TM images of 2000 and 2010, the landscape pattern changes were analyzed by classification statistics, dynamic transfer matrix and landscape pattern indices. Based on the MOD11A2 and MOD13A2 data from 2000 to 2010, NDVI and land surface temperature (LST) dataset were extracted. NDVI time-series data processed with S-G filtering method was used to find temporal and spatial variation characteristics, and linear trend was analyzed by ordinary least squares regression method. NDVI and LST were used to construct Ts-NDVI feature space, and then TVDI was obtained to explore changes of soil moisture. Relationship between climate variations and wetland degradation were found by ordinary least squares regression method. Results indicated that both wetland area and landscape heterogeneity decreased. Annual NDVI presented fluctuated decreasing trend and there was strong spatial heterogeneity in patterns of NDVI change. Annual TVDI proved to have an increasing trend which showed the drought gradually intensified. “Warming and drought” climate appear to be critical factors contributing to wetland degradation. Precipitation has a stronger correlation rather than temperature.

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