Landscape pattern changes and ecological risk in the Padam River Basin under the background of the

doi:10.3969/j.issn.1004-9479.2021.04.2020082

Abstract

Abstract:

This paper took the Padam River Basin in Bangladesh as the research object, constructing the landscape ecological risk assessment model based on landscape pattern index. Autocorrelation analysis, geo-statistical analysis and center of gravity transfer model were used to study the landscape change and the temporal and spatial characteristics of the basin based on 5 remote sensing images from 1980 to 2017.The results show that: (1)From 1980 to 2017,forest land and cultivated land are Main landscape types in the basin. There were clear changes in the landscape types, in which the areas of cultivated land and wet land decline substantially, and the forest land, building land, unused land increase; (2) During the period of 1980-2017, the overall ecological risk declines continuously and various types of risks transform significantly. Except for the reduction in the area of low-risk areas, the remaining risk areas increased to varying degrees. The ecological risk gravity center in each period of the basin in located in Sirajganj District, mainly transfers along the north-south direction; (3) The global Moran's index of each period indicates the ecological risk in the study area showing positive spatial correlation characteristics. The HH accumulation is basically stable, which mainly distributes on the Padam River and its coasts. The low value aggregation region changes significantly, and it finallygathers in the west and south of the basin. The result of study could provide a scientific theoretical basis and reliable technical support for constructing regional ecological security patterns and establishing the early warning mechanism.

Key words: ecological risk, landscape pattern index, center of gravity transfer, Padam River Basin, "Belt and Road" Initiative

摘要：

“一带一路”沿线国家的生态风险研究有利于区域可持续发展，充分发挥对外辐射的作用，促进国家间经济流动、贸易畅通，实现共同繁荣。以孟加拉国博多河流域为例，选取1980—2017年期间的5期遥感影像，基于景观格局指数建立生态风险模型，综合运用空间自相关分析法、地统计学分析法、重心转移法等方法，研究流域景观格局变化特征以及生态风险演变规律。结果表明：（1）1980—2017年流域内景观类型主要是林地和耕地，且景观格局变化显著，耕地和湿地面积减少，林地、建设用地和未利用地面积增加；（2）1980年以来，流域生态风险整体呈下降趋势，但各类风险转化显著，除低风险区面积减少之外，其余风险区均存在不同程度的增加，各期流域生态风险重心均位于锡拉杰甘杰县，主要在流域中部沿南北方向发生偏移；（3）流域内各期的生态风险在空间上呈显著正相关关系，“高-高”集聚基本稳定，主要分布在博多河及其沿岸；“低-低”集聚变化显著，由博多河下游先向上游及流域西南部变化，后逐渐向流域西部和南部聚拢。研究结果为构建流域生态安全格局及进行生态风险预警工作等提供科学依据和理论支撑。

关键词: 生态风险, 景观格局指数, 重心转移, 博多河流域, “一带一路”

Qifa YUE, Xiaoqing ZHAO, Sinan LI, Kun TAN, Junwei PU, Qian WANG. Landscape pattern changes and ecological risk in the Padam River Basin under the background of the "Belt and Road" Initiative[J]. World Regional Studies, 2021, 30(4): 839-850.

岳启发, 赵筱青, 李思楠, 谭琨, 普军伟, 王茜. “一带一路”背景下博多河流域景观格局变化及生态风险评价研究[J]. 世界地理研究, 2021, 30(4): 839-850.

Figures/Tables 10

Fig.1 Location and ecological evaluation unit division in Padam River Basin

Tab.1 Calculation of landscape pattern index

指数	公式	意义
破碎度指数(C_i)	$C i = n i A i$	表示景观类型的一定时间和性质下的破碎程度。C_i越大，则景观内的稳定性越差^[21]
分离度指数(F_i)	$F i = A 2 A i n i A$	表示景观类型中不同斑块间的分离程度，F_i越大，则景观中不同板块间越分散，景观分布越复杂^[22]
优势度指数(D_i)	$D i = M i + L i 4 + P i 2$	表示整个景观中某些版块的重要性，D_i的大小直接反映了斑块对景观格局形成和变化的影响程度^[23]
脆弱度指数(S_i)	由专家打分并归一化	表示不同生态系统的易损程度，借鉴前人研究^[24]并结合博多河流域实际情况，对其赋值如下：未利用地为7，湿地为6，水域为5，耕地为4，草地为3，林地为2，建设用地为1，对赋值进行归一化处理，得到各自的脆弱度指数

Tab.1 Calculation of landscape pattern index

指数	公式	意义
破碎度指数(C_i)	$C i = n i A i$	表示景观类型的一定时间和性质下的破碎程度。C_i越大，则景观内的稳定性越差^[21]
分离度指数(F_i)	$F i = A 2 A i n i A$	表示景观类型中不同斑块间的分离程度，F_i越大，则景观中不同板块间越分散，景观分布越复杂^[22]
优势度指数(D_i)	$D i = M i + L i 4 + P i 2$	表示整个景观中某些版块的重要性，D_i的大小直接反映了斑块对景观格局形成和变化的影响程度^[23]
脆弱度指数(S_i)	由专家打分并归一化	表示不同生态系统的易损程度，借鉴前人研究^[24]并结合博多河流域实际情况，对其赋值如下：未利用地为7，湿地为6，水域为5，耕地为4，草地为3，林地为2，建设用地为1，对赋值进行归一化处理，得到各自的脆弱度指数

Tab.2 Patterns of landscape patterns of Padam River Basin from 1980 to 2017

景观类型	时间	面积/km²	斑块数目/个	破碎度	分离度	优势度	干扰度	脆弱度	损失度
草地	1980	1982	15587	0.0786	0.5544	0.2708	0.2598	0.1071	0.0278
	1990	1504	21721	0.1444	0.8625	0.2918	0.3893	0.1071	0.0417
	2000	1689	17802	0.1054	0.6953	0.2845	0.3182	0.1071	0.0341
	2010	1839	21930	0.1192	0.7088	0.3228	0.3368	0.1071	0.0361
	2017	2311	20988	0.0908	0.5518	0.3187	0.2747	0.1071	0.0294
耕地	1980	15194	22015	0.0145	0.0860	0.5552	0.1441	0.1429	0.0206
	1990	13305	40245	0.0302	0.1327	0.5482	0.1646	0.1429	0.0235
	2000	12455	33715	0.0271	0.1298	0.5311	0.1587	0.1429	0.0227
	2010	9760	37502	0.0384	0.1747	0.5012	0.1718	0.1429	0.0245
	2017	7304	39390	0.0539	0.2392	0.4729	0.1933	0.1429	0.0276
林地	1980	10517	35058	0.0333	0.1567	0.5055	0.1648	0.0714	0.0118
	1990	12372	32792	0.0265	0.1288	0.5153	0.1550	0.0714	0.0111
	2000	12104	28102	0.0232	0.1219	0.5115	0.1505	0.0714	0.0107
	2010	15628	16875	0.0108	0.0732	0.5441	0.1362	0.0714	0.0097
	2017	18218	17146	0.0094	0.0633	0.5903	0.1417	0.0714	0.0101
水域	1980	1866	4417	0.0237	0.3135	0.2507	0.1560	0.1786	0.0279
	1990	2115	12890	0.0609	0.4725	0.2698	0.2262	0.1786	0.0404
	2000	2318	12394	0.0535	0.4228	0.2920	0.2120	0.1786	0.0379
	2010	1901	14424	0.0759	0.5560	0.2909	0.2629	0.1786	0.0469
	2017	1359	5475	0.0403	0.4791	0.2594	0.2158	0.1786	0.0385
建设用地	1980	82	330	0.0401	1.9419	0.0115	0.6049	0.0357	0.0216
	1990	112	450	0.0400	1.6601	0.0190	0.5218	0.0357	0.0186
	2000	204	1288	0.0630	1.5453	0.0316	0.5014	0.0357	0.0179
	2010	263	1408	0.0535	1.2539	0.0327	0.4094	0.0357	0.0146
	2017	443	1404	0.0317	0.7450	0.0465	0.2487	0.0357	0.0089
湿地	1980	760	11134	0.1466	1.2227	0.2489	0.4899	0.2143	0.1050
	1990	774	9696	0.1253	1.1200	0.1543	0.4295	0.2143	0.0920
	2000	747	8457	0.1132	1.0835	0.1545	0.4125	0.2143	0.0884
	2010	425	3956	0.0931	1.3023	0.1223	0.4617	0.2143	0.0989
	2017	257	4122	0.1602	2.1968	0.0993	0.7590	0.2143	0.1626
未利用地	1980	594	2977	0.0501	0.8082	0.1135	0.2902	0.2500	0.0726
	1990	812	2639	0.0325	0.5566	0.0915	0.2015	0.2500	0.0504
	2000	1478	3314	0.0224	0.3430	0.1418	0.1425	0.2500	0.0356
	2010	1177	2903	0.0247	0.4031	0.1049	0.1543	0.2500	0.0386
	2017	1103	2592	0.0235	0.4064	0.1161	0.1569	0.2500	0.0392

Tab.2 Patterns of landscape patterns of Padam River Basin from 1980 to 2017

景观类型	时间	面积/km²	斑块数目/个	破碎度	分离度	优势度	干扰度	脆弱度	损失度
草地	1980	1982	15587	0.0786	0.5544	0.2708	0.2598	0.1071	0.0278
	1990	1504	21721	0.1444	0.8625	0.2918	0.3893	0.1071	0.0417
	2000	1689	17802	0.1054	0.6953	0.2845	0.3182	0.1071	0.0341
	2010	1839	21930	0.1192	0.7088	0.3228	0.3368	0.1071	0.0361
	2017	2311	20988	0.0908	0.5518	0.3187	0.2747	0.1071	0.0294
耕地	1980	15194	22015	0.0145	0.0860	0.5552	0.1441	0.1429	0.0206
	1990	13305	40245	0.0302	0.1327	0.5482	0.1646	0.1429	0.0235
	2000	12455	33715	0.0271	0.1298	0.5311	0.1587	0.1429	0.0227
	2010	9760	37502	0.0384	0.1747	0.5012	0.1718	0.1429	0.0245
	2017	7304	39390	0.0539	0.2392	0.4729	0.1933	0.1429	0.0276
林地	1980	10517	35058	0.0333	0.1567	0.5055	0.1648	0.0714	0.0118
	1990	12372	32792	0.0265	0.1288	0.5153	0.1550	0.0714	0.0111
	2000	12104	28102	0.0232	0.1219	0.5115	0.1505	0.0714	0.0107
	2010	15628	16875	0.0108	0.0732	0.5441	0.1362	0.0714	0.0097
	2017	18218	17146	0.0094	0.0633	0.5903	0.1417	0.0714	0.0101
水域	1980	1866	4417	0.0237	0.3135	0.2507	0.1560	0.1786	0.0279
	1990	2115	12890	0.0609	0.4725	0.2698	0.2262	0.1786	0.0404
	2000	2318	12394	0.0535	0.4228	0.2920	0.2120	0.1786	0.0379
	2010	1901	14424	0.0759	0.5560	0.2909	0.2629	0.1786	0.0469
	2017	1359	5475	0.0403	0.4791	0.2594	0.2158	0.1786	0.0385
建设用地	1980	82	330	0.0401	1.9419	0.0115	0.6049	0.0357	0.0216
	1990	112	450	0.0400	1.6601	0.0190	0.5218	0.0357	0.0186
	2000	204	1288	0.0630	1.5453	0.0316	0.5014	0.0357	0.0179
	2010	263	1408	0.0535	1.2539	0.0327	0.4094	0.0357	0.0146
	2017	443	1404	0.0317	0.7450	0.0465	0.2487	0.0357	0.0089
湿地	1980	760	11134	0.1466	1.2227	0.2489	0.4899	0.2143	0.1050
	1990	774	9696	0.1253	1.1200	0.1543	0.4295	0.2143	0.0920
	2000	747	8457	0.1132	1.0835	0.1545	0.4125	0.2143	0.0884
	2010	425	3956	0.0931	1.3023	0.1223	0.4617	0.2143	0.0989
	2017	257	4122	0.1602	2.1968	0.0993	0.7590	0.2143	0.1626
未利用地	1980	594	2977	0.0501	0.8082	0.1135	0.2902	0.2500	0.0726
	1990	812	2639	0.0325	0.5566	0.0915	0.2015	0.2500	0.0504
	2000	1478	3314	0.0224	0.3430	0.1418	0.1425	0.2500	0.0356
	2010	1177	2903	0.0247	0.4031	0.1049	0.1543	0.2500	0.0386
	2017	1103	2592	0.0235	0.4064	0.1161	0.1569	0.2500	0.0392

Tab.3 Average ecological risk index of each landscape in Padam River Basin

年份	草地	耕地	林地	水域	建设用地	湿地	未利用地
1980	0.001788	0.013897	0.002488	0.001585	0.000018	0.002577	0.001392
1990	0.002024	0.010092	0.004418	0.002756	0.000068	0.002298	0.001321
2000	0.001858	0.009110	0.004197	0.002831	0.000118	0.002131	0.001698
2010	0.002141	0.007730	0.004904	0.002880	0.000124	0.001357	0.001464
2017	0.002194	0.006507	0.005951	0.001690	0.000127	0.001350	0.001395

Tab.4 Fitting model parameters of variation function of landscape ecological risk index in Padam River Basin

年份	模型	块金值	基台值	块金基台比	变程	R²	RSS
1980	高斯模型	0.018	0.0512	35.2%	28925	0.895	7.003×10^-5
1990	指数模型	0.0023	0.1036	2.2%	56100	0.918	4.522×10^-4
2000	指数模型	0.0097	0.0801	12.1%	54300	0.896	2.36×10^-4
2010	指数模型	0.0102	0.09	11.3%	43200	0.917	1.936×10^-4
2017	指数模型	0.0049	0.1198	4.1%	25400	0.987	4.431×10^-5

Fig.2 Spatial distribution of ecological risk in Padam River Basin

Tab.5 Distribution and area changes of the ecological risk grades in Padam River Basin(km2)

时间	低风险	较低风险	中风险	较高风险	高风险
1980	14782.87	7754.88	4210.81	2764.15	1482.04
1990	7193.11	14303.49	4877.34	3080.59	1540.22
2000	9988.49	12189.18	4775.73	3102.7	938.65
2010	10798.94	11052.04	4084.58	3566.54	1492.66
2017	10169.65	10143.56	6127.57	2898.71	1655.26
1980—1990	—7589.76	6548.61	666.53	316.44	58.18
1990—2000	2795.38	—2114.31	—101.61	22.11	—601.57
2000—2010	810.45	—1137.14	—691.15	463.84	554.01
2010—2017	—629.29	—908.48	2042.99	—667.83	162.6
1980—2017	—4613.22	2388.68	1916.76	134.56	173.22

Fig.3 Ecological risk of gravity trajectory in Padam River Basin

Fig.4 Moran scatter of landscape ecological risk in Padam River Basin

Fig.5 Local autocorrelation of ecological risk in Padam River Basin

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