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Remote Sensing for Natural Resources    2025, Vol. 37 Issue (2) : 246-255     DOI: 10.6046/zrzyyg.2023325
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Spatiotemporal trajectory of Spartina alterniflora expansion and its impact on landscape patterns in the Yancheng coastal wetland since the 1980s
XU Ya(), ZHANG Huabing()
North Jiangsu Institute of Agricultural and Rural Modernization, Yancheng Teachers University, Yancheng 224007, China
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Abstract  

This study investigated the core area of the Jiangsu Yancheng Wetland National Reserve of Rare Birds based on 12 remote sensing images from 1983 to 2021 as data sources. Specifically, this study explored the spatiotemporal trajectory of Spartina alterniflora expansion and its impact on landscape patterns by combining landscape ecology methods with geographical information system (GIS) technology. The results show that from 1983 to 2021, Spartina alterniflora expanded significantly, leading to a 12.365 fold area increase. It experienced initial expansion, accelerated growth, and stagnation stages, which would be succeeded by the control and elimination stage. Its distribution area manifested a significant linear relationship with time. Its spatiotemporal trajectory was characterized by the migration of the western, eastern, and central clusters. In 1983, 1988, 1992, and 1997, the western clusters migrated primarily toward the southeast. In 2000, 2002, 2006, and 2009, the eastern clusters migrated principally toward the northeast. Both the western and eastern clusters showed a seaward trend. In 2011, 2014, 2017, and 2021, the central clusters displayed a significant landward trend despite disorderly migration. Spartina alterniflora expansion resulted in a cumulative contribution rate of 43.352% to regional landscape structure changes. Its contribution was consistent with its expansion stages, showing a low-high-low pattern. The area of Spartina alterniflora was significantly correlated with the regional landscape pattern index. The landscape pattern of Spartina alterniflora was significantly correlated with the regional landscape pattern, with significant correlations between type-scale indices, including largest patch index (LPI), total edge (TE), edge density (ED), and fractal dimension index of area-weighted mean (FRAC_ AM), and the regional landscape pattern index at the significance level of 0.01. However, the area of Spartina alterniflora was significantly negatively correlated with habitat quality. Overall, the results of this study suggest that the expansion of Spartina alterniflora profoundly affects landscape patterns and functions, warranting control according to local conditions.
Keywords Spartina alterniflora      spatiotemporal trajectory      landscape pattern      rate of contribution to landscape change      Yancheng coastal wetland     
ZTFLH:  TP79  
  K903  
Issue Date: 09 May 2025
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Ya XU
Huabing ZHANG
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Ya XU,Huabing ZHANG. Spatiotemporal trajectory of Spartina alterniflora expansion and its impact on landscape patterns in the Yancheng coastal wetland since the 1980s[J]. Remote Sensing for Natural Resources, 2025, 37(2): 246-255.
URL:  
https://www.gtzyyg.com/EN/10.6046/zrzyyg.2023325     OR     https://www.gtzyyg.com/EN/Y2025/V37/I2/246
Fig.1  The location of the study area
Fig.2  Decision tree classification
Fig.3  Landscape changes of the study area
Fig.4  Linear relationship between area of Spartina alterniflora and year
年份 LPI TE ED AI FRAC_AM LSI
1983年 1.462 20 592.047 1.821 90.995 1.062 3.393
1988年 1.011 34 792.460 3.092 85.837 1.114 5.066
1992年 1.087 33 159.686 2.934 87.507 1.104 4.810
1997年 6.560 40 596.982 3.641 94.256 1.109 3.832
2000年 10.874 113 108.751 10.000 92.480 1.138 6.596
2002年 11.499 57 881.943 5.117 96.978 1.103 3.359
2006年 25.626 86 203.383 7.621 96.463 1.155 4.201
2009年 27.190 93 283.743 8.247 96.316 1.173 4.426
2011年 33.466 123 198.264 10.892 96.048 1.157 5.137
2014年 30.570 91 104.741 8.192 96.743 1.157 4.209
2017年 31.674 74 166.771 6.557 97.676 1.137 3.335
2021年 31.414 151 121.920 13.325 94.422 1.202 6.480
Tab.1  Pattern index changes of Spartina alterniflora
r LPI TE ED AI FRAC_AM LSI
互花
米草		 0.982**① 0.834** 0.836** 0.821** 0.814** 0.145
Tab.2  Correlation between the area and landscape pattern of Spartina alterniflora
Fig.5  Spatiotemporal trajectory of Spartina alterniflora
时段 互花米草扩
张面积/hm2		 区域景观变
化面积/hm2		 贡献率/%
1983—1997年 644.604 2 461.286 26.190
1997—2006年 2 017.240 4 807.768 41.968
2006—2021年 661.478 3 019.392 21.908
1983—2021年 3 323.321 7 665.844 43.352
Tab.3  Contribution rate of Spartina alterniflora expansion to landscape structure change
r LPI TE ED AI FRAC_AM LSI SHDI
互花米草 -0.914**① 0.741** 0.742** -0.706* 0.709** 0.741** 0.915**
Tab.4  Correlation between Spartina alterniflora area and region landscape pattern
类型 区域景观
LPI TE ED AI FRAC_AM LSI SHDI
LPI -0.874**① 0.740** 0.742** -0.709** 0.734** 0.741** 0.880**
TE -0.806** 0.927** 0.926** -0.909** 0.852** 0.926** 0.824**
ED -0.808** 0.927** 0.926** -0.909** 0.853** 0.926** 0.827**
AI -0.856** 0.413 0.416 -0.367 0.345 0.414 0.854**
FRAC_AM -0.811** 0.871** 0.871** -0.855** 0.880** 0.871** 0.815**
LSI -0.165 0.641* 0.638* -0.659* 0.625* 0.640* 0.185
Tab.5  Correlation between Spartina alterniflora landscape pattern and region landscape pattern
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