Welcome to Chinese Journal of Applied Ecology! Today is Share:

Chinese Journal of Applied Ecology ›› 2020, Vol. 31 ›› Issue (6): 1898-1908.doi: 10.13287/j.1001-9332.202006.019

• Original Articles • Previous Articles     Next Articles

Variation in the vegetation fade stage and its relationships with climate and vegetation productivity in Inner Mongolia, China

SA Ri-gai1,2, BAO Gang1,2*, BAO Yu-hai1,2, HU Ri-cha3, JIANG Kang1   

  1. 1College of Geographical Science, Inner Mongolia Normal University, Hohhot 010022, China;
    2Inner Mongolia Key Laboratory of Remote Sensing & Geography Information System, Inner Mongolia Normal University, Hohhot 010022, China;
    3Meteorologic Bureau of Zheng-xiangbai Banner in Inner Mongolia, Xilinguole 013800, Inner Mongolia, China
  • Received:2020-03-02 Online:2020-06-15 Published:2020-06-15
  • Contact: * E-mail: baogang@imnu.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (61631011, 41861021) and the Innovative Project of Young “Grasslands Talents” in Inner Mongolia Autonomous Region.

Abstract: Based on the MODIS NDVI data from 2001 to 2018, we extracted the fade stage of vegetation in Inner Mongolia and the characteristics of its temporal and spatial changes using the Logistic curve maximum curvature method of the cumulative normalized difference vegetation index (NDVI). We analyzed the responses of fade stage to climatic factors and NDVI at the ecological zone level. The results showed that the fade stage in Inner Mongolia occurred between the day of year (DOY) 260 and 280 during the study period. It was DOY 270-280 in the forest ecological zone, and was delayed from the south to north. The fade stage in the grassland ecological zone was the earliest and ranged between DOY 257 and 273, and was delayed from the northeast to southwest. The fade stage in the desert ecological zone ranged between DOY 270 and 283, which was delayed from the northeast to southwest. From 2001 to 2018, the fade stage in three ecological zones showed an insignificant delaying trend. Spatially, vegetation productivity decreased from the northeast to southwest, with a larger area of an increasing temporal trend than that of a decreasing trend. The fade stage in the entire Inner Mongolia and three ecological zones was greatly affected by precipitation during the two or three months before the fade stage and was positively correlated with the pre-season average temperature, maximum temperature, and minimum temperature, respectively. The increases/decreases in vegetation productivity in August and September delayed/advanced the fade stage in entire Inner Mongolia and three ecological zones. In contrast, the increases/decreases in vegetation productivity in June and July advanced/delayed the fade stage in the grassland and desert ecological zone.