Changing features and influencing factors of small and micro wetlands in Wuxi City

doi:10.12302/j.issn.1000-2006.202204038

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2024, Vol. 48 ›› Issue (2): 27-36.doi: 10.12302/j.issn.1000-2006.202204038

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Changing features and influencing factors of small and micro wetlands in Wuxi City

ZHANG Jiamin¹(), LIU Xiaoyan¹, DENG Yi², FENG Yao², ZHU Bin¹, CHU Lei¹, ZHANG Zengxin¹^,^*()

1. Co-Innovation Center for Sustainable Forestry in Southern China, Jiangsu Province Key Laboratory of Soil and Water Conservation and Ecological Restoration, College of Forestry and Grassland, College of Soil and Water Conservation, Nanjing Forestry University, Nanjing 210037, China
2. Wuxi Natural Resources and Planning Bureau, Wuxi 214023,China

Received:2022-04-15 Revised:2022-06-13 Online:2024-03-30 Published:2024-04-08

Abstract

Abstract:

【Objective】 Small and micro wetlands provide several important ecological functions, such as habitat support for key species, biological transfer, hydrological regulation and water purification, education and rest. Wuxi City in China contains numerous wetlands, of which most over 8 hm² have been protected in recent years. However, not all small and micro wetlands have been protected in Wuxi City, and research regarding spatiotemporal changes in these habitats under various factors is lacking. Thus, analyzing the temporal and spatial characteristics and driving forces of small and micro wetlands can provide a theoretical basis for wetland ecological restoration and protection construction.【Method】 Based on Landsat satellite images in 2000, 2010 and 2020, patch information of small and micro wetlands in Wuxi City were extracted using support vector machine classification and other methods. Combined with meteorological and land use data, the spatiotemporal evolution of small and micro wetlands in Wuxi City and its influencing factors were analyzed.【Result】 (1) Within the past two decades, the total wetland area in Wuxi City has decreased from 178 000 hm² in 2000 to 104 000 hm² in 2020. Among them, the total area of small and micro wetlands has decreased from 19 000 hm² in 2000 to 15 000 hm² in 2020. (2) In terms of spatial distribution, small and micro wetlands in Wuxi were mainly distributed in the county-level city Yixing, which accounted for 40.0% of the area of Wuxi City. Small and micro wetlands in Wuxi City predominantly consisted of natural wetlands, accounting for up to 61.0% and displayed marked seasonal variation characteristics. In 2020, the proportion of seasonal small and micro wetlands in the total area of small and micro wetlands was as high as 73.8%. (3) The dynamic of small and micro wetlands in Wuxi City were positively correlated with temperature and precipitation due to natural factors and human activities. Specifically, human activities had a significant impact on the decline of small and micro wetland areas, and the transformation between wetland and other land types accelerated the decline of wetlands.【Conclusion】 Wuxi City is rich in small and micro wetland resources, which are in rapid decline due to seasonal and land use changes. Thus, the protection and restoration of small and micro wetlands must be enhanced to mitigate the negative impacts imposed by different factors.

Key words: small and micro wetland, land use, spatial and temporal distribution, Wuxi City

CLC Number:

P962

ZHANG Jiamin, LIU Xiaoyan, DENG Yi, FENG Yao, ZHU Bin, CHU Lei, ZHANG Zengxin. Changing features and influencing factors of small and micro wetlands in Wuxi City[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2024, 48(2): 27-36.

Figures/Tables 7

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Table 2

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References 40

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年份 year	类型 sensor type	分辨率/ (m×m) spatial resolution	月份 month	波段数 band
2000	Landsat 4/5 TM	30×30	4、6、9	7
2010	Landsat 4/5 TM	30×30	5、10、12	7
2020	Landsat 8 OLI	30×30	3、5、9	9

序号 serial No.	地点 location	纬度(N) latitude	经度(E) longitude	类型 type	实地调查面积/hm² field survey area	Landsat 8 面积/hm² Landsat 8 area	差值/hm² difference	误差/% error
1	宜兴市横山村 Hengshan Village, Yixing City	31°15'	119°31'	坑塘swag	1.17	1.15	0.02	1.70
2	宜兴市桂芳村 Guifang Village, Yixing City	31°27'	119°42'	养殖坑塘 breeding pits	6.30	5.97	0.33	5.50
3	锡山区中东村 Xishan District Middle East Village	31°33'	120°30'	坑塘swag	1.21	1.23	-0.02	-1.60
4	江阴市西石桥社区 Xishiqiao Community, Jiangyin City	31°51'	120°04'	水稻田paddy	4.14	3.81	0.33	8.70
5	江阴市北湖西村 Beihu West Village, Jiangyin City	31°53'	120°01'	坑塘swag	2.61	2.57	0.04	1.60

Changing features and influencing factors of small and micro wetlands in Wuxi City

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