Journal of Geographical Sciences ›› 2017, Vol. 27 ›› Issue (5): 565-578.doi: 10.1007/s11442-017-1393-5

• Research Articles • Previous Articles     Next Articles

The dynamic response of forest vegetation to hydrothermal conditions in the Funiu Mountains of western Henan Province

Wenbo ZHU(), Shuangcheng LI()   

  1. College of Urban and Environmental Sciences, Peking University, Laboratory for Earth Surface Processes of the Ministry of Education, Beijing 100871, China
  • Received:2016-10-22 Accepted:2016-12-21 Online:2017-05-10 Published:2017-09-22
  • About author:

    Author: Zhu Wenbo (1989-), PhD Candidate, specialized in the mountain ecosystem service, development and utilization of regional natural resources. E-mail: zhuwb517@163.com

  • Supported by:
    National Natural Science Foundation of China, No.41671090;National Basic Research Program (973 Program), No.2015CB452702

Abstract:

This paper uses HJ-1 satellite multi-spectral and multi-temporal data to extract forest vegetation information in the Funiu Mountain region. The S-G filtering algorithm was employed to reconstruct the MODIS EVI (Enhanced Vegetation Index) time-series data for the period of 2000-2013, and these data were correlated with air temperature and precipitation data to explore the responses of forest vegetation to hydrothermal conditions. The results showed that: (1) the Funiu Mountain region has relatively high and increasing forest coverage with an average EVI of 0.48 over the study period, and the EVI first shows a decreasing trend with increased elevation below 200 m, then an increasing trend from 200-1700 m, and finally a decreasing trend above 1700 m. However, obvious differences could be identified in the responses of different forest vegetation types to climate change. Broad-leaf deciduous forest, being the dominant forest type in the region, had the most significant EVI increase. (2) Temperature in the region showed an increasing trend over the 14 years of the study with an anomaly increasing rate of 0.27℃/10a; a fluctuating yet increasing trend could be identified for the precipitation anomaly percentage. (3) Among all vegetation types, the evergreen broad-leaf forest has the closest EVI-temperature correlation, whereas the mixed evergreen and deciduous forest has the weakest. Almost all forest types showed a weak negative EVI-precipitation correlation, except the mixed evergreen and deciduous forest with a weak positive correlation. (4) There is a slight delay in forest vegetation responses to air temperature and precipitation, with half a month only for limited areas of the mixed evergreen and deciduous forest.

Key words: forest vegetation, hydro-thermal condition, response time lag, EVI, Funiu Mountains, China