Research on vegetation phenological changes in the Otindag sandy land Based on MODIS NDVI and EVI
YUAN Zhi-hui1,2,3, SA Chu-la1, YIN Shan1
1. College of Geographical Science, Inner Mongolia Normal University, Hohhot 010022, China; 2. Inner Mongolian Key Laboratory of Remote Sensing and Geographic Information System, Inner Mongolia Normal University, Hohhot 010022, China; 3. The Department of Natural Resources, Wulanchabu 010022, China
Abstract：Based on the MODIS NDVI and EVI data in recent 20 years, the vegetation phenology in Otindag sandy land was extracted by using the extreme curvature method of logistic curve and dynamic threshold method, and its temporal and spatial changes were analyzed. The response of vegetation phenology to elevation and meteorological factors was analyzed by using the research result data. The results indicated that the vegetation phenology in the study area showed a slight fluctuation trend from 2000 to 2019. The start of growth season (SOS) was concentrated in 110~140 Julian day, while the end of growth season (EOS) was in 250~280 Julian day and was delayed (0.28d/a). The length of growth season (LOS) was in 120~170 Julian day and was lengthened (0.23d/a). For the trend, SOS was showed a decreasing trend which occupied 51.51% of the total study area. EOS was showed an increasing trend in 32.98% of the study area while the rest decreased. LOS of the area accounted for 62.71% of the study area was showed a prolonged trend. In the altitude range of 900~1500m, SOS was significantly delayed, EOS was not significantly advanced, and LOS was significantly shortened as the altitude increased. The precipitation had an advance effect on SOS in January, February, April and November, December of the previous year. The temperature and precipitation had an obvious effect on the delay of EOS from June to September. On the whole, the responses of phenology to meteorological factors in Otindag sandy land were complex, showing obvious seasonal differences and topographical variability.
元志辉, 萨楚拉, 银山. 基于MODIS植被指数的浑善达克沙地植被物候变化[J]. 中国环境科学, 2021, 41(11): 5254-5263.
YUAN Zhi-hui, SA Chu-la, YIN Shan. Research on vegetation phenological changes in the Otindag sandy land Based on MODIS NDVI and EVI. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(11): 5254-5263.
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