Spatiotemporal Variation of Vegetation Phenology and Its Affecting Factors in the Mu Us Sandy Land

Wang Jingpu; Liu Lianyou; Jia Kai; Tian Lihui

doi:10.7522/j.issn.1000-694X.2015.00021

Journal of Desert Research >

2015 , Vol. 35 >Issue 3: 624 - 631

DOI: https://doi.org/10.7522/j.issn.1000-694X.2015.00021

Spatiotemporal Variation of Vegetation Phenology and Its Affecting Factors in the Mu Us Sandy Land

Wang Jingpu ,
Liu Lianyou ,
Jia Kai ,
Tian Lihui

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1. Key Laboratory of Environmental Change and Natural Disaster, Beijing Normal University, Beijing 100875, China;
2. Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China

Received date: 2014-11-20

Revised date: 2015-01-06

Online published: 2015-05-20

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Abstract

Based on NDVI from MODIS, this paper analyzed the spatiotemporal changes in vegetation phenology in the Mu Su Sandy Land from 2001 to 2013, and the response of the phenology and elevation, climatic factors. The results are enumerated as follows: (1) From 2001 to 2013, the start of growth season (SOG) was concentrated in 90-156 Julian day, the end of growth season (EOG) was in 245-323 Julian day, and the length of growth season (LOG) was in 118-200 Julian day. Elevation played an important role in the regional differentiation of phenology, with the increase of altitude, SOG significantly delayed, EOG advanced, and LOG significantly shortened. (2) From 2001 to 2013, SOG of vegetation came obviously earlier by nine days per decade (R=-0.46, p=0.06), EOG was early and LOG lengthened, but with no significance. (3) Vegetation phenology in the study area was mainly affected by precipitation, but with no apparent correlation with temperature. The correlation coefficient of SOG and spring precipitation was -0.58 (p=0.02), the correlation coefficient of EOG and autumn precipitation was 0.42 (p=0.07), and the correlation coefficient of LOG and autumn precipitation was 0.48 (p=0.05).

Key words： phenology; elevation; climatic factors; Mu Us Sandy Land; spatiotemporal variation

Cite this article

Wang Jingpu , Liu Lianyou , Jia Kai , Tian Lihui . Spatiotemporal Variation of Vegetation Phenology and Its Affecting Factors in the Mu Us Sandy Land[J]. Journal of Desert Research, 2015 , 35(3) : 624 -631 . DOI: 10.7522/j.issn.1000-694X.2015.00021

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