Temporal dynamics of vegetation NDVI and its response to drought in Songnen grassland
Qiyun Ma, Jiquan Zhang, Siqin Tong, Zhenhua Dong, Xuehai Nie, Yanan Chen
Available Online November 2016.
- https://doi.org/10.2991/rac-16.2016.116How to use a DOI?
- NDVI; Drought; Standardized precipitation evapotranspiration index; Regional Response; Songnen grassland
- Based on daily data recorded in 13 weather stations in Songnen grassland over the period 1982 - 2013, temporal variations in drought were investigated using the standardized precipitation evapotranspiration index (SPEI) and characteristics in NDVI were also analyzed using a time series data set of GIMMS NDVI3g during growing season (from April to October). In addition, for exploring the effects of climate change on vegetation, the correlation relationships between SPEI and NDVI were studied at different time scales. The results shown that the spatial distribution of NDVI presented a gradually reducing characteristic from the northeastern to southwestern. The NDVI shown an increasing trend with a slope of 0.0004. Monthly NDVI exhibited the same pattern, with higher mainly ranged from July to September. The SPEI index experienced a downward trend and the drought often occurs in every month except in April. As a whole, this paper found that the correlation relationship between NDVI and SPEI was weak besides June and September. The lagging effect that existed in the impact on vegetation of drought was no significant. However, the lagging effect of one month lag was better than two month lag.
- Open Access
- This is an open access article distributed under the CC BY-NC license.
Cite this article
TY - CONF AU - Qiyun Ma AU - Jiquan Zhang AU - Siqin Tong AU - Zhenhua Dong AU - Xuehai Nie AU - Yanan Chen PY - 2016/11 DA - 2016/11 TI - Temporal dynamics of vegetation NDVI and its response to drought in Songnen grassland BT - 7th Annual Meeting of Risk Analysis Council of China Association for Disaster Prevention (RAC-2016) PB - Atlantis Press SP - 721 EP - 726 SN - 1951-6851 UR - https://doi.org/10.2991/rac-16.2016.116 DO - https://doi.org/10.2991/rac-16.2016.116 ID - Ma2016/11 ER -