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Remote Sensing Technology and Application  2022, Vol. 37 Issue (4): 1012-1020    DOI: 10.11873/j.issn.1004-0323.2022.4.1012
    
Approach to Remote Sensing Assessment of Ecological Changes of Land Creation in Lanzhou City
Xiaolong Gao1,2,3,4(),Haowen Yan1,2,3(),Guigang Wang1,2,3,Jianrong Bai4
1.Faculty of Geomatics,Lanzhou Jiaotong University,Lanzhou 730070,China
2.National-Local Joint Engineering Research Center of Technologies and Applications for National Geographic State Monitoring,Lanzhou 730070,China
3.Gansu Provincial Engineering Laboratory for National Geographic State Monitoring,Lanzhou 730070,China
4.Mapping Institutiion of Gansu province,Lanzhou 730000,China
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Abstract  

To solve the problem that the existing methods cannot accurately extract the land creation region and quantitatively assess the ecological change of the land creation region, This paper proposed a method to extract the land creation region based 3D terrain change. Based on the remote sensing images of 1991,2001,2009 and 2016,the Remote Sensing Ecological Index(RSEI) was established based on the indexes of greenness, humidity, heat and dryness. The results showed that RSEI can not only quantitatively reflect the quality of ecological environment, but also can be spatially visualized. From 1991 to 2016,the area of land creation region continued to increase. The RSEI increased from 0.297 in 1991 to 0.406 in 2016.The overall ecological environmental quality of Lanzhou was an upward trend, but it had obvious spatial difference. The ecological deterioration areas were concentrated in land creation region of the northern mountainous area of Lanzhou and the southeast of Lanzhou New Area. The land creation project resulted in the expansion of built-up land and bare land, and the decrease of vegetation coverage. It indicated that the land creation project has a certain impact on the regional quality of ecological environment. Therefore, we should control the scale of land creation project,and protect the environment of fragile ecological region.

Key words:  Remote sensing ecological index      Land creation      Land cover     
Received:  24 January 2021      Published:  28 September 2022
P237  
Corresponding Authors:  Haowen Yan     E-mail:  381940392@qq.com;58391794@qq.com
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Xiaolong Gao
Haowen Yan
Guigang Wang
Jianrong Bai

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Xiaolong Gao,Haowen Yan,Guigang Wang,Jianrong Bai. Approach to Remote Sensing Assessment of Ecological Changes of Land Creation in Lanzhou City. Remote Sensing Technology and Application, 2022, 37(4): 1012-1020.

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http://www.rsta.ac.cn/EN/10.11873/j.issn.1004-0323.2022.4.1012     OR     http://www.rsta.ac.cn/EN/Y2022/V37/I4/1012

Fig.1  Location of study area
Fig.2  Remote sensing image in the surrounding area of Lanzhou
Fig.3  Diagram of work flow
Fig.4  Scope distribution of land creation project in Lanzhou surrounding area
Fig.5  Standard deviation elliptical and Meancenter
年份指标PC1PC2PC3PC4
1991绿度0.460.430.190.75
湿度0.52-0.630.56-0.10
热度-0.570.230.790.02
干度-0.44-0.60-0.150.65
特征值0.06030.01240.00680.0002
贡献率75.66%15.56%8.53%0.25%
2001绿度0.540.330.29-0.72
湿度0.46-0.700.500.22
热度-0.550.220.810.02
干度-0.45-0.59-0.13-0.66
特征值0.04930.01290.00700.0003
贡献率70.94%18.56%10.07%0.43%
2009绿度0.400.460.31-0.73
湿度0.49-0.530.660.21
热度-0.720.160.67-0.01
干度-0.28-0.69-0.14-0.65
特征值0.03660.01290.00550.0003
贡献率66.18%23.33%9.95%0.54%
2016绿度0.550.28-0.03-0.79
湿度0.39-0.450.800.08
热度-0.410.690.60-0.06
干度-0.61-0.500.08-0.61
特征值0.03810.00790.00440.0007
贡献率74.56%15.46%8.61%1.37%
Table 1  Principal component analysis of four indicators
Fig.6  The images of RSEI index in 1991,2001,2009,2016
年份绿度/NDVI湿度/WETNESS热度/LST干度/BCIRSEI指数
均值标准差均值标准差均值标准差均值标准差均值标准差
19910.4280.1250.3070.1540.6820.1560.5170.1270.2970.187
20010.3440.1290.2680.1360.6540.1420.5230.1200.2720.181
20090.4350.0970.2760.1210.6950.1480.4820.0960.3090.160
20160.5180.1120.5240.1000.4750.2050.4630.1290.4060.168
Table 2  Mean change of RSEI
RSEI分级1991年2001年2009年2016年
面积/km2比例/%面积/km2比例/%面积/km2比例/%面积/km2比例/%
差(0—0.2)3 700.6451.763 765.6452.672 934.7341.051 408.3019.70
较差(0.2—0.4)2 284.6231.962 306.4632.262 817.1239.413 175.5644.42
中(0.4—0.6)626.568.76582.548.15873.6412.221 727.4824.16
良(0.6—0.8)302.314.23272.943.82356.264.98584.168.17
优(0.8—1)235.313.29221.853.10167.682.35253.933.55
Table 3  The changes of ecological grade area and proportion
Fig.7  Chang map of RSEI between 1991 and 2016
类别级差级面积/km2类面积/km2比例/%
变差-410.81565.797.91
-341.30
-2106.01
-1407.68
不变02 599.562 599.5636.36
变好13 273.163 984.0855.73
2624.92
367.33
418.67
Table 4  Change detection
RSEI分级1991年2016年
面积/km2比例/%面积/km2比例/%
差 (0.0—0.2)1.700.84167.2482.47
较差(0.2—0.4)153.5375.7130.1814.88
中等(0.4—0.6)37.3618.424.712.32
良 (0.6—0.8)8.073.980.670.33
优 (0.8—1.0)2.141.060.000.00
Table 5  Ecological grade area and proportion of Land creation area
区域植被覆盖度/%地表温度/oCRSEI
2009年2016年2009年2016年2009年2016年
2009—2016年削山造地范围23.114.535.935.90.2470.121
2009—2016年削山造地范围缓冲区25.023.034.735.30.2910.219
Table 6  Change of FVC, LST and RSEI of Lanzhou Cut-off area from 2009 to 2016
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