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Remote Sensing for Land & Resources    2021, Vol. 33 Issue (1) : 214-220     DOI: 10.6046/gtzyyg.2020178
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Research on spatial change of the boreal forest cover in Siberia over the past 30 years based on TM images
TIAN Lei1,2(), FU Wenxue1(), SUN Yanwu1, JING Linhai1, QIU Yubao1, LI Xinwu1
1. Key Laboratory of Digital Earth, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
2. School of Geomatics, Anhui University of Science and Technology, Huainan 232001, China
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Abstract  

In the context of global warming, the study of the long-term spatial change characteristics of the boreal forest cover not only is important for global climate change and sustainable development research but also can provide the support for the further research on the response of the boreal forest changes to climate change. The data sources were Landsat TM/OLI images with 2 temporal series in summer season from 1985 and 2015, respectively. The Krasnoyarsk region in Russia was selected as the typical research area of the boreal forest in Siberia. The forest cover in 1985 and 2015 was classified based on the decision tree method and verification with random sample points of GF-2 satellite images, and the classification accuracy was 94.53%. The information of the dynamic spatial distribution of forest cover was quantified through latitude zones with 2° interval in the range of N51°~69° and the spatial overlay analysis for the dynamic forest cover maps of the two periods. The results show that, in the past 30 years, the boreal forest cover in Siberia changed significantly, and the overall forest cover changed from 75.42% in 1985 to 80.53% in 2015, increasing by 5.11 percentage points. Simultaneously, the changes of forest land area were different with each latitude zones: the highest change rate occurred in the latitude zone N65°~67°, followed by the latitude zone N67°~69° and the lowest was in N57°~59°. Overall, the forest cover increased in all latitude zones, the most significant increase was in N63°~67°; the change of forest cover was relatively stable in N57°~63° and the increase of forest cover decreased with the latitude zone in N51°~57°.
Keywords TM images      boreal forest      forest coverage      Siberia      spatial change     
ZTFLH:  TP79  
Corresponding Authors: FU Wenxue     E-mail: richard_dada@outlook.com;fuwx@aircas.ac.cn
Issue Date: 18 March 2021
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Lei TIAN
Wenxue FU
Yanwu SUN
Linhai JING
Yubao QIU
Xinwu LI
Cite this article:   
Lei TIAN,Wenxue FU,Yanwu SUN, et al. Research on spatial change of the boreal forest cover in Siberia over the past 30 years based on TM images[J]. Remote Sensing for Land & Resources, 2021, 33(1): 214-220.
URL:  
https://www.gtzyyg.com/EN/10.6046/gtzyyg.2020178     OR     https://www.gtzyyg.com/EN/Y2021/V33/I1/214
Fig.1  Location of the study area
Fig.2  Preprocessing flowchart of TM/OLI scenes
Fig.3  TM/OLI scenes classification based on decision tree classification model
Fig.4  Forest cover in 1985 and 2015
纬度 总面积/km2 1985年 2015年 1985—2015年
面积/km2 覆盖度/% 面积/km2 覆盖度/% 面积增加
量/km2		 面积变
化率/%		 覆盖度变
化百分点
N 67°~69° 19 596.45 5 838.93 29.80 6 731.24 34.35 892.31 15.28 4.55
N 65°~67° 58 813.18 32 255.77 54.84 40 192.99 68.34 7 937.23 24.61 13.50
N 63°~65° 58 364.09 40 083.99 68.68 45 243.34 77.52 5 159.35 12.87 8.84
N 61°~63° 66 364.15 55 911.37 84.25 56 952.28 85.82 1 040.92 1.86 1.57
N 59°~61° 130 507.24 106 668.66 81.73 110 896.36 84.97 4 227.70 3.96 3.24
N 57°~59° 155 232.73 139 694.20 89.99 141 250.67 90.99 1 556.47 1.11 1.00
N 55°~57° 114 456.67 79 057.51 69.07 88 167.88 77.03 9 110.38 11.52 7.96
N 53°~55° 77 579.58 53 261.04 68.65 58 131.19 74.93 4 870.15 9.14 6.28
N 51°~53° 33 564.27 26 059.58 77.64 27 744.80 82.66 1 685.21 6.47 5.02
总计 714 478.36 538 831.05 75.42 575 310.77 80.53 36 479.72 6.77 5.11
Tab.1  Statistics of forest cover information in 1985 and 2015
Fig.5  Monitoring results of dynamic changes of forest cover based on classification results
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