RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2015, Vol. 24 >> Issue (08): 1305-1314.doi: 10.11870/cjlyzyyhj201508007

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GROWING SEASON NDVI VARIATION IN THE DONGTING LAKE WATERSHED FROM 1982 TO 2010 AND THE CLIMATIC AND ANTHROPOGENIC INFLUENCES

GUO Jing1, GUAN Hua-de1,2, ZHANG Xin-ping1   

  1. 1. College of Resources and Environmental Science, Hunan Normal University, Changsha 410081, China;
    2. School of the Environment, Flinders University, Adelaide 5001, Australia
  • Received:2014-10-22 Revised:2015-01-03 Online:2015-08-20
  • Contact: 关华德 E-mail:huade.guan@flinders.edu.au E-mail:huade.guan@flinders.edu.au

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Abstract: Trend and interannual variability of growing season vegetation cover were examined for the Dongting Lake Watershed over the period of 1982-2010, using GIMMS 3g together with other AVHRR NDVI products and MODIS vegetation index products. The four datasets of AVHRR showed a great similarity in spatial distribution of NDVI trends from 1982 to 1999, while comparison of MODIS EVI/NDVI and GIMMS 3 g during 2000-2010 showed a significant difference in NDVI trends between MODIS NDVI and GIMMS 3g. This is likely owing to MODIS NDVI saturation in the study area. Spatial distribution of trends resulting from GIMMS 3 g and MODIS EVI had some consistency. Thus GIMMS 3 g was selected for detailed analysis because of its long temporal coverage and consistency with other products. Possible influencing factors (precipitation, temperature, sunshine hours and vegetation cover) leading to interannual variations of growing season NDVI were explored using multiple linear regression and correlation analysis. The results indicate that an increasing NDVI trend occurred in the study area during the past 29 years, only 9.5% pixels in the Dongting Lake Watershed showed some NDVI reduction. The eastern, western and southern parts of the region covered by mountain forests experienced a large decreased in NDVI during 1998-2000. De-trended NDVI monthly anomaly was significantly correlated with de-trended concurrent precipitation anomaly, concurrent sunshine duration and cumulative three-month temperature anomaly. The three climate factors explained 37% temporal variability of de-trended growing season monthly NDVI of the study watershed, while these factors failed to explain the overall NDVI increase during 1982-2010. This suggests that the increase in NDVI is more likely associated with an increase in vegetation cover over the period likely owing to the improvement of social-economic condition in the study area. This is supported by good correlation between the NDVI trend and the government reported forest cover change, and consistent spatial distribution of growing season NDVI with that of actual forest cover in this watershed. Therefore, growing season NDVI can be used as an indicator for forest coverage changes in the Dongting Lake Watershed.

Key words: MVC, linear regression analysis, vegetation index, temporal and spatial variation, climate factors

CLC Number: 

  • TP79
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