Analysis of the influence of farmland pattern on landscape diversity in artificial oasis along the Yellow River in Ningxia： a case study in Zhongwei-Zhongning Plain Irrigation District

doi:10.7522/j.issn.1000-694X.2022.00101

Journal of Desert Research ›› 2023, Vol. 43 ›› Issue (2): 21-27.DOI: 10.7522/j.issn.1000-694X.2022.00101

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Analysis of the influence of farmland pattern on landscape diversity in artificial oasis along the Yellow River in Ningxia： a case study in Zhongwei-Zhongning Plain Irrigation District

Rongrong Qiao¹(), Haitao Huang², Chunyuan Dong³, Lihui Luo⁴, Xueli Chang³()

^1.School of Life Sciences，Nanjing University，Nanjing 210023，China
^2.Yantai No. 5 Middle School，Yantai 264001，Shandong，China
^3.School of Resources and Environmental Engineering，Ludong University，Yantai 264025，China
^4.Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China

Received:2022-04-19 Revised:2022-07-07 Online:2023-03-20 Published:2023-04-12
Contact: Xueli Chang

Abstract

Abstract:

Landscape diversity is an integrated index to measure the type and area proportion of land use / cover in regional ecosystems and the most frequently used index in the research of landscape ecology. As the main landscape component of artificial oases in arid and semi-arid， farmland has been one of the focus of research on the spatial structure of oasis in the past half a century. Based on the land use/cover data with a spatial resolution of 30 m in 2020， this study used the spatial differentiation factor explanatory power （q-statistic） of the geodetector model and method of the moving window to analyze the influence of farmland pattern on landscape diversity in Weining plain irrigation district of artificial oasis along the Yellow River in Ningxia. The results showed that the change of landscape diversity （LDI） in plains along the Yellow River in Ningxia was significantly affected by farmland total area （CA） and largest patch index （LPI）， and their interaction with patch euclidean nearest neighbor distance （Enn_mn） and perimeter-area fractal dimension （Pafrac） was more significant than that alone. The grading study of different farmland pattern index showed that CA and LPI at different grade had a significant effects on LDI， Enn_mn and Pafrac between 67-801 m （q > 0.05） and 0.142-1.060， respectively， which do not differ significantly in their effect on LDI， while those not within this threshold had a significant effect on LDI.

Key words: geodetector, moving window, landscape diversity, farmland pattern, oasis

CLC Number:

P901

Rongrong Qiao, Haitao Huang, Chunyuan Dong, Lihui Luo, Xueli Chang. Analysis of the influence of farmland pattern on landscape diversity in artificial oasis along the Yellow River in Ningxia： a case study in Zhongwei-Zhongning Plain Irrigation District[J]. Journal of Desert Research, 2023, 43(2): 21-27.

Figures/Tables 9

Fig.1 Location of the study area

Table 1 Grading of pattern factors in farmland

指数	级别	分级范围	指数	级别	分级范围
CA/hm²	Ⅰ	0~254	LPI/%	Ⅰ	0~25
	Ⅱ	254~474		Ⅱ	25~46
	Ⅲ	474~631		Ⅲ	46~65
	Ⅳ	631~771		Ⅳ	65~83
	Ⅴ	771~918		Ⅴ	83~100
Enn_mn/m	Ⅰ	0~67	Pafrac	Ⅰ	0.000~0.124
	Ⅱ	67~188		Ⅱ	0.124~0.412
	Ⅲ	188~401		Ⅲ	0.412~0.750
	Ⅳ	401~801		Ⅳ	0.750~1.060
	Ⅴ	801~1 931		Ⅴ	1.060~1.497

Fig.2 Distribution of LDI and farmland pattern factors in the study area （CA， Class Area； Enn_mn， Euclidean nearest neighbor distance_mean； LPI， Largest Patch Index； Pafrac，Perimeter-Area Fractal Dimension）

Table 2 Types of interaction between two independent variables in Geodetector Model

交互作用类型	判断准则
非线性增强	$q x 1 ? x 2 > q x 1 + q (x 2)$
双因子增强	$q x 1 ? x 2 > q x 1 和 q (x 2)$
单因子非线性减弱	$q x 1 ? x 2 < ? q x 1 或 q (x 2)$
非线性减弱	$q x 1 ? x 2 < ? q x 1 和 q (x 2)$
独立	$q x 1 ? x 2 = ? q x 1 + q (x 2)$

Table 2 Types of interaction between two independent variables in Geodetector Model

交互作用类型	判断准则
非线性增强	$q x 1 ? x 2 > q x 1 + q (x 2)$
双因子增强	$q x 1 ? x 2 > q x 1 和 q (x 2)$
单因子非线性减弱	$q x 1 ? x 2 < ? q x 1 或 q (x 2)$
非线性减弱	$q x 1 ? x 2 < ? q x 1 和 q (x 2)$
独立	$q x 1 ? x 2 = ? q x 1 + q (x 2)$

Table 3 The explanatory power （ q-statistic） of different farmland pattern factors on LDI

	Enn_mn	LPI	Pafrac	CA
q	0.344	0.631	0.063	0.692
P	0.000	0.000	0.000	0.000

Table 4 The explanatory power （ q-statistic） of interactive detection between different farmland pattern factors on LDI

	Enn_mn	LPI	Pafrac	CA
Enn_mn	0.344
LPI	0.701*	0.631
Pafrac	0.376	0.644	0.063
CA	0.751*	0.704*	0.709*	0.692

Fig.3 Grading detector of different farmland pattern factors

Fig.4 Distribution of non-significant effects of factor interaction and grading on LDI in Zhongwei-Zhongning irrigation area

Table 5 Statistics of regional space with no significant influence on LDI in factor interaction and factor classification

类别	面积/km²	平均斑块面积/km²	最大斑块比例/%	斑块间距离/m
Pafrac分级不显著区	14.94	2.13	0.30	1 116
Enn_mn分级不显著区	249.39	2.24	15.10	851.9
因子交互作用不显著区	122.44	2.61	24.80	717.5

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Analysis of the influence of farmland pattern on landscape diversity in artificial oasis along the Yellow River in Ningxia： a case study in Zhongwei-Zhongning Plain Irrigation District

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