Dynamic change of wetland landscape in Changsha based on JRC global surface water data

doi:10.12302/j.issn.1000-2006.202303019

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2024, Vol. 48 ›› Issue (2): 9-18.doi: 10.12302/j.issn.1000-2006.202303019

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Dynamic change of wetland landscape in Changsha based on JRC global surface water data

ZENG Zheli¹(), SHE Jiyun¹^,^*(), TANG Zichao², LUO Chuying¹

1. College of Forestry, Central South University of Forestry and Technology, Changsha 410004, China
2. Hunan Prospecting Designing and Research General Institute for Agriculture and Forestry Industry, Changsha 410007, China

Received:2023-03-14 Revised:2023-06-16 Online:2024-03-30 Published:2024-04-08

Abstract

Abstract:

【Objective】 The objectives of this study were to explore the temporal and spatial evolutions of wetland landscape in Changsha from 1999 to 2019, to comprehensively analyze the dynamic-change characteristics of wetland-landscape patterns in Changsha in the same period, and to explore the influence mechanism of natural and human factors on wetland-landscape patterns, so as to provide an important theoretical basis for the protection and rational utilization of wetlands in Changsha. 【Method】 Based on global surface water data (GSWD), combined with meteorological and hydrological data, this paper adopted the methods of wetland distribution information extraction, wetland type classification and landscape pattern index, aiming to achieve long-term and continuous monitoring of the dynamic evolution of annual wetland-landscape patterns in Changsha City from 1999 to 2019 based on the seasonal and fluctuating characteristics of wetlands. In addition, we analyzed the evolution trend of its long time scale, as well as the short-term fluctuation change characteristics. 【Result】 (1) Since 1999, the wetland area in Changsha has been overall increase, with permanent river being the main wetland type. From 2007 to 2009, there was a large fluctuation in wetland landscape, as represented by the transformation of permanent rivers and lakes to seasonal rivers and lakes, respectively, in the early stage, and by the reversal of fragmentation after 2008. The fragmentation degree of wetland-landscape pattern in Changsha continuously intensified until 2017 and later began to gradually recover. (2) The wetland-landscape pattern in Changsha was greatly affected by the natural factors such as precipitation and runoff from the Xiangjiang River and extreme freezing disasters that led to large fluctuations of the wetland-landscape pattern. The wetland landscape pattern in Changsha was also affected by human factors such as growing population and urban expansion that may lead to the intensification, but government policies and measures had a positive effect on wetland restoration. 【Conclusion】 It was feasible to use GSWD to extract wetland information. The wetland area in Changsha had continued to grow, among which permanent river was the main wetland type. The results from this study could provide important scientific references for the protection and rational utilization of wetlands in Changsha.

Key words: wetland, landscape pattern, global surface water data (GSWD), Changsha City

CLC Number:

S759
X87

ZENG Zheli, SHE Jiyun, TANG Zichao, LUO Chuying. Dynamic change of wetland landscape in Changsha based on JRC global surface water data[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2024, 48(2): 9-18.

Figures/Tables 11

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湿地类型 wetland type	判读标志 interpretation sign	湿地类型 wetland type	判读标志 interpretation sign
季节性河流 seasonal river	位于季节性湿地水面范围内,整体呈深蓝色或蓝绿色,条带状,纹理光滑	永久性湖泊 permanent lake	位于永久性湿地水面范围内,整体呈深蓝色或蓝黑色,纹理较光滑,形状规则,面积大于8 hm²
永久性河流 permanent river	位于永久性湿地水面范围内,整体呈深蓝色或蓝绿色,条带状,纹理光滑	滩涂 tidal	位于湖泊和河流中间或边缘,且在季节性湿地水面范围内,呈浅蓝色、淡黄色或蓝色黄色交界处,纹理光滑
季节性湖泊 seasonal lake	位于季节性湿地水面范围内,整体呈深蓝色或蓝黑色,纹理较光滑,形状规则,面积大于8 hm²	坑塘水田及其他小型湿地other small wetlands	面积小于8 hm²,形状较为规整,或有田埂状纹理
非湿地 non-wetlands	湿地水面范围以外的部分

2007年	2008年
2007年	季节性河流 seasonal river	永久性河流 permanent river	季节性湖泊 seasonal lake	永久性湖泊 permanent lake	坑塘水田及其他小型湿地 other wetlands	滩涂 tidal	非湿地 non- wetlands	转出面积 transferred out area
季节性河流seasonal river	—	0.45	0.01		0.02	0.17	2.58	3.23
永久性河流permanent river	8.31	—	0.01			2.59	0.20	11.10
季节性湖泊seasonal lake			—	1.81			1.27	3.08
永久性湖泊permanent lake			7.39	—			0.04	7.43
坑塘水田及其他小型湿地 other small wetlands	0.03		0.08		—		3.81	3.92
滩涂tidal	0.37	0.86	0.05			—	2.33	3.62
非湿地non-wetlands	5.93	0.01	6.59	0.07	14.83	1.55	—	28.99
转入面积transferred in area	14.64	1.33	14.13	1.88	14.86	4.30	10.23	—

2008年	2009年
2008年	季节性河流 seasonal river	永久性河流 permanent river	季节性湖泊 seasonal lake	永久性湖泊 permanent lake	坑塘水田及其他小型湿地 other wetlands	滩涂 tidal	非湿地 non- wetlands	转出面积 transferred out area
季节性河流seasonal river	—	10.87			0.01	0.18	4.58	15.64
永久性河流permanent river	0.36	—				0.94	0.01	1.31
季节性湖泊seasonal lake	0.01	0.01	—	11.54	0.04	0.04	2.28	13.92
永久性湖泊permanent lake			1.08	—				1.08
坑塘水田及其他小型湿地 other small wetlands	0.03				—		9.71	9.74
滩涂tidal	0.43	2.78			0.01	—	2.27	5.49
非湿地non-wetlands	2.86	0.11	3.72	0.19	6.62	0.71	—	14.21
转入面积transferred in area	3.69	13.77	4.80	11.73	6.68	1.87	18.85	—

景观格局指标 landscape pattern index	年均气温 annual average temperature	年均降水量 annual precipitation	湘江年径流量 annual runoff of Xiangjiang River	常住人口 permanent population	生产总值 total output	第一产业 primary industry	第二产业 secondary industry	第三产业 tertiary industry
湿地总面积total wetland area	0.16	0.49^*	0.56^**	0.72^**	0.74^**	0.69^**	0.68^**	0.76^**
季节性河流面积area of seasonal river	0.28	0.50^*	0.08	-0.01	-0.03	0.01	-0.05	-0.02
永久性河流面积area of permanent river	-0.04	0.15	0.49^*	0.79^**	0.82^**	0.77^**	0.80^**	0.81^**
季节性湖泊面积area of seasonal lake	0.18	0.50^*	0.12	0.05	0.05	0.10	0.05	0.04
永久性湖泊面积area of permanent lake	-0.02	0.13	0.48^*	0.76^**	0.80^**	0.76^**	0.79^**	0.77^**
滩涂面积area of tidal	-0.06	-0.17	0.07	-0.71^**	-0.75^**	-0.77^**	-0.81^**	-0.66^**
坑塘水田及其他小型湿地面积 area of other small wetlands	0.18	0.46^*	0.39	0.62^**	0.64^**	0.57^**	0.58^**	0.68^**
景观分割度指数LD	0.28	0.48^*	0.28	0.28	0.29	0.27	0.25	0.31
聚集度指数AI	-0.16	-0.33	-0.33	-0.76^**	-0.80^**	-0.71^**	-0.741^**	-0.82^**
景观形状指数LSI	0.17	0.45^*	0.45^*	0.76^**	0.80^**	0.71^**	0.73^**	0.82^**
最大斑块指数LPI	-0.26	-0.47^*	-0.29	-0.26	-0.26	-0.24	-0.23	-0.29

Dynamic change of wetland landscape in Changsha based on JRC global surface water data

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