Unraveling the driving mechanisms of landscape connectivity dynamics in the Mu Us Sandy Land, northern China
JIN Xiaoze1,2,3, HE Zhaoquan1,2,3,4,*(), SHANG Xue1,2,3, WANG Xiukang1,2,3, XING Yingying1,2,3
1School of Life Sciences, Yan'an University, Yan'an 716000, China 2Key Laboratory of Applied Ecology of Universities in Shaanxi Province on the Loess Plateau, College of Life Sciences, Yan'an University, Yan'an 716000, China 3Shaanxi Key Laboratory of Research and Utilization of Resource Plants on the Loess Plateau, College of Life Sciences, Yan'an University, Yan'an 716000, China 4Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
The Mu Us Sandy Land, a critical agro-pastoral ecotone in northern China, served as a key region for understanding landscape connectivity dynamics under coupled climate-human pressures. This study used landscape pattern indices and the Geodetector model to systematically quantify the spatiotemporal dynamics of structural landscape connectivity in the Mu Us Sandy Land from 1990 to 2020 by integrating multi-temporal land use and meteorological data. The driving mechanisms of the landscape connectivity dynamics and present status of regional ecological restoration were analyzed. The results showed an overall decline in structural landscape connectivity over the past three decades, marked by a distinct spatial pattern of "decreasing in the east and increasing in the west". Fragmentation in the east was driven by intensive human expansion, while aggregation in the west resulted from long-term ecological restoration. Factor analysis revealed that structural landscape connectivity was jointly influenced by climatic and anthropogenic factors, with wide-ranging synergistic interactions. The dominant drivers changed temporally, i.e., in the early phases (1990-2000), natural factors (e.g., wind speed and temperature) and agricultural activities were the main drivers; in the transitional phase (2000-2010), precipitation played an important role; and in the later phases (2010-2020), the human-land synergy regime characterized by human activity factors, particularly residential density, gained predominant explanatory power. This study revealed the multifactor synergistic driving mechanisms and their temporal evolution, providing a scientific basis for adaptive ecological restoration and spatial planning in semi-arid regions.
Received: 21 March 2026
Published: 31 October 2026
Conceptualization: HE Zhaoquan, SHANG Xue, JIN Xiaoze; Data curation: XING Yingying; Formal analysis: HE Zhaoquan, WANG Xiukang; Funding acquisition: HE Zhaoquan; Investigation: XING Yingying; Methodology: SHANG Xue; Project administration: WANG Xiukang; Resources: WANG Xiukang; Software: WANG Xiukang; Supervision: JIN Xiaoze, XING Yingying; Validation: XING Yingying; Visualization: SHANG Xue, JIN Xiaoze; Writing - original draft preparation: JIN Xiaoze; Writing - review and editing: HE Zhaoquan, SHANG Xue, XING Yingying, WANG Xiukang. All authors approved the manuscript.
JIN Xiaoze, HE Zhaoquan, SHANG Xue, WANG Xiukang, XING Yingying. Unraveling the driving mechanisms of landscape connectivity dynamics in the Mu Us Sandy Land, northern China. Journal of Arid Land, 2026, 18(10): 1720-1738.
Table 2 Trend and persistence characteristic of meteorological factors
Fig. 4Spatial distribution and area proportion of land use types in the Mu Us Sandy Land from 1990 to 2020. (a), 1990; (b), 1995; (c), 2000; (d), 2005; (e), 2010; (f), 2015; (g), 2020.
Fig. 5String diagram of land use type transition in the Mu Us Sandy Land in different periods. (a), 1990-1995; (b), 1995-2000; (c), 2000-2005; (d), 2005-2010; (e), 2010-2015; (f), 2015-2020; (g), 1990-2020; (h), 2000-2020.
Type
Grassland
Cropland
Construction land
Woodland
Water body
Unused land
Loss
(km2)
Grassland
15,978.070
260.277
222.630
205.957
25.526
1235.679
1950.069
Cropland
251.084
2615.525
65.247
51.768
17.575
50.446
2800.561
Construction land
2.092
4.743
124.228
0.232
0.482
1.184
130.869
Woodland
71.108
36.449
26.727
698.905
2.409
26.906
791.396
Water body
31.461
16.072
6.079
0.726
471.536
50.688
545.101
Unused land
1687.359
178.737
238.697
61.018
43.315
13,589.940
14,111.710
Gain
2043.104
2851.526
460.978
812.649
535.317
13,719.164
-
Table 3 Land use conversion matrix in the Mu Us Sandy Land from 1990 to 2020
Fig. 6Landscape indices in the Mu Us Sandy Land from 1990 to 2020. H', Shannon's diversity index; DIVISION, landscape division index; CONTAG, contagion index; LSI, landscape shape index; ED, edge density.
Fig. 7Spatial variation of structural landscape connectivity in the Mu Us Sandy Land from 1990 to 2020. (a), ED; (b), LSI; (c), CONTAG; (d), DIVISION; (e), H'.
Region
ED
LSI
CONTAG
DIVISION
H'
Trend direction
East
25.736→29.681
4.083→4.562
56.149→55.773
0.669→0.698
0.892→0.973
Fragmentation
West
17.261→18.492
3.124→3.284
55.451→57.695
0.565→0.554
0.727→0.740
Aggregation
Note: ED, edge density; LSI, landscape shape index; CONTAG, contagion index; DIVISION, landscape division index; H', Shannon's diversity index. All inter-regional differences were statistically significant at P<0.050 level.
Table 4 Comparison of structural landscape connectivity indices between eastern and western Mu Us Sandy Land from 1990 to 2020
Fig. 9Interaction result of the Geodetector (GD). (a), 1990; (b), 1995; (c), 2000; (d), 2005; (e), 2010; (f), 2015; (g), 2020. NL, nighttime light; RD, residential density; CLR, cropland ratio; LUCC, land use/cover change; DEM, digital elevation model.
Fig. 10Conceptual diagram of the driving mechanisms of structural landscape connectivity in the Mu Us Sandy Land from 1990 to 2020. Arrows indicate causal relationships and bidirectional arrows indicate synergistic interaction.
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