梨园河流域景观格局对地表水质的影响

doi:10.13866/j.azr.2024.11.04

Abstract

Abstract:

Studying the degree and mechanism of landscape pattern’s influence on inland river water quality is of great significance for the water environment protection of inland river basins in arid areas. This study was based on the Liyuan River in Linze County. We studied landscape pattern data and measured water quality, using redundancy and correlation analyses to investigate the relationship between landscape patterns and water quality in different buffer zones. The water bodies in the study area generally met the Class II water quality standard, except for the average value of the chemical oxygen demand (COD_Cr) concentration, which fell into Class III. Additionally, the average dissolved oxygen (DO), total phosphorus (TP), permanganate index (COD_Mn), and ammonia nitrogen (NH₃-N) concentration values met the Class II water quality standard. The buffer zone’s landscape composition was dominated by arable land, and construction land was the second largest type. Analyzing the landscape index revealed that the strength of human activities was not evenly distributed in the buffer zone, and the degree of human interference was the greatest in the 100 m buffer zone. The human interference degree in the 100 m buffer zone was the greatest. The proportion of cultivated land was significantly and positively correlated with DO, TP, electrical conductivity (EC), dissolved solids (TDS), and salinity, while constructed land was significantly and positively correlated with TP and NH₃-N. The largest patch index (LPI) and contagion index (CONTAG) were positively correlated with the water quality indicators, whereas patch density (PD), edge density (ED), landscape shape index (LSI), and Shannon’s diversity index (SHDI) were negatively correlated. Redundancy analysis indicated that the explanatory rate of the changes in the water quality indicators by the composition of the landscape and landscape indices was the highest in the 300 m buffer zone. The analysis indicated that the explanatory rate of landscape composition and index on water quality index changes were the highest in the 300 m buffer zone, and the 300 m buffer zone was determined to be the optimal buffer scale for landscape pattern’s influence on the water quality index. Therefore, optimizing the landscape structure within the 300 m buffer zone to enhance the retention and adsorption capacity of pollutants can improve the water quality of the Liyuan River.

Key words: correlation analysis, landscape pattern, water quality, Liyuan River

WANG Yu, LI Neng’an, LUO Tianfeng, ZHANG Ying, YUAN Xingpeng, TIAN Miao, XIN Yaling, HU Feiyan. Impacts of landscape patterns on surface water quality in the Liyuan River Basin[J].Arid Zone Research, 2024, 41(11): 1831-1841.

Figures/Tables 10

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References 35

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编号	指标	分析方法	最低检出率 /（mg·L^-1）	方法出处
1	TP	钼酸铵分光光度法	0.01	HJ636-2012
2	NH₃-N	纳氏试剂分光光度法	0.05	HJ535-2009
3	COD_Cr	重铬酸钾法	10	HJ828-2017
4	COD_Mn	滴定法	0.5	GB11892-89

景观指数	生态含义
斑块密度（PD）	单位面积上的斑块数，反映景观破碎化程度
边缘密度（ED）	反映单位面积上各斑块类型边界长度或总边界长度
最大斑块指数（LPI）	反映景观的优势类型，也可间接反映人类活动的干扰程度，LPI值越大，人类干扰程度越高
景观形状指数（LSI）	LSI值越大，表示景观斑块不规则化程度越高，空间异质特征越高
蔓延度指数（CONTAG）	反映景观不同斑块类型的团聚程度和延展趋势，表征景观类型的聚散性程度
香农多样性指数（SHDI）	SHDI值越大，景观类型越丰富，空间异质特征越强

缓冲区/m	景观指数	EC	DO	TDS	盐度	COD_Mn	NH₃-N	COD_Cr
100	PD	-0.144	-0.522	-0.144	-0.159	-0.024	-0.605^*	0.311
	LPI	0.055	-0.080	0.055	0.063	0.265	0.138	-0.023
	ED	-0.201	-0.318	-0.201	-0.204	-0.099	-0.523	-0.013
	LSI	-0.124	-0.249	-0.124	-0.130	-0.002	-0.513	-0.041
	CONTAG	0.178	0.077	0.178	0.194	0.177	0.135	-0.013
	SHDI	-0.059	0.118	-0.059	-0.052	-0.374	-0.196	-0.114
200	PD	-0.377	-0.561^*	-0.377	-0.381	0.013	-0.359	-0.292
	LPI	0.424	0.543^*	0.424	0.452	0.526	0.352	0.564^*
	ED	-0.495	-0.712^**	-0.495	-0.509	-0.155	-0.700^**	-0.326
	LSI	-0.528	-0.767^**	-0.528	-0.522	-0.162	-0.667^**	-0.351
	CONTAG	0.257	0.341	0.257	0.278	0.533^*	0.429	0.322
	SHDI	-0.451	-0.568^*	-0.451	-0.463	-0.347	-0.476	-0.643^*
300	PD	-0.446	-0.634^*	-0.446	-0.449	0.053	-0.502	-0.030
	LPI	0.711^**	0.659^*	0.711^**	0.724^**	0.294	0.366	0.668^**
	ED	-0.801^**	-0.723^**	-0.801^**	-0.805^**	-0.290	-0.700^**	-0.321
	LSI	-0.792^**	-0.700^**	-0.792^**	-0.796^**	-0.261	-0.702^**	-0.300
	CONTAG	0.563^*	0.139	0.563^*	0.569^*	0.666^**	0.266	0.606^*
	SHDI	-0.648^*	-0.438	-0.648^*	-0.650^*	-0.293	-0.455	-0.730^**
400	PD	-0.275	-0.475	-0.275	-0.286	-0.007	-0.355	0.019
	LPI	0.604^*	0.664^**	0.604^*	0.623^*	0.193	0.292	0.380
	ED	-0.626^*	-0.620^*	-0.626^*	-0.634^*	-0.216	-0.660^*	-0.311
	LSI	-0.688^**	-0.594^*	-0.688^**	-0.692^**	-0.191	-0.628^*	-0.291
	CONTAG	0.538^*	0.042	0.538^*	0.542^*	0.353	0.183	0.520
	SHDI	-0.486	-0.284	-0.486	-0.489	-0.180	-0.431	-0.404

景观格局	缓冲区/m	解释率%
景观格局	缓冲区/m	轴一	轴二	所有轴
景观构成	100	10.2	8.2	19.5
	200	9.9	7.9	18.8
	300	14.4	5.7	26.7
	400	7.4	6.5	16.1
	600	8.1	6.6	17.1
	800	10.6	5.8	17.6
	1000	10.7	4.4	17.9
景观指数	100	20.2	10.6	38.4
	200	26.2	21	54.6
	300	41.1	11.7	60.9
	400	31.7	14.1	53.4
	600	32.4	10.1	47.7
	800	31.6	9.5	47.4
	1000	30.8	8.6	47.1

研究区	类型	优势地类	设置缓冲区尺度/m	特征尺度/m	参考文献
艾比湖区域	湖泊	耕地、未利用地	100、200、300、400	300	[22]
东南山丘区	水库	林地	100、300、500、800、1000	800	[32]
苏南地区	坑塘	耕地、水域	100、200、300、400、500	100	[28]
青弋江流域	河流	林地	100、200、500、1000、2000	500	[35]
本研究区	河流	耕地、建设用地	100、200、300、400、800、1000	300	-

Impacts of landscape patterns on surface water quality in the Liyuan River Basin

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