Journal of Geographical Sciences, Volume. 30, Issue 9, 1419(2020)
Exploring the spatio-temporal impacts of farmland reforestation on ecological connectivity using circuit theory: A case study in the agro-pastoral ecotone of North China
Fig. 1. Analysis framework for evaluating the effect of farmland reforestation on ecological connectivity
Fig. 3. A diagram showing circuit theory for landscape connectivity
Fig. 4. Reforested farmland during the period 2000-2015 (a. spatial pattern; b. reforested area and reforestation rate in each county)
Fig. 5. Spatial distribution of ecological sources and key conservation areas (a and b. sources in 2000 and 2015; c and d. key areas in 2000 and 2015)
Fig. 6. Spatial pattern of ecological corridors and obstacles (a and b. corridors in 2000 and 2015; c and d. obstacles and the occupation of land use types in 2015)
Fig. 8. Correlations of farmland reforestation and ecological connectivity
Fig. 9. Comparison of the actual and counterfactual scenarios in terms of ecological sources, corridors, pinch points and patch importance (Type I: unchanged importance; Type II: upgraded importance; Type III: downgraded importance; Type IV: gain of important patches; and Type V: loss of important patches)
Table 1.
Ecological threat factors
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Ecological threat factors
Threats Max distance/km Weight Decay function Cultivated land 8 0.7 Linear Water 7 0.5 Exponential Built-up land 12 1.0 Exponential Unused land 8 0.8 Linear
Table 2.
Sensitivity of land use types to threat factors
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Sensitivity of land use types to threat factors
Land use type Habitat Cultivated land Water Built-up land Unused land Cultivated land No 0 0 0 0 Forestland Yes 0.70 0.30 0.80 0.70 Shrubland Yes 0.60 0.40 0.70 0.65 Open forestland* Yes 0.60 0.40 0.60 0.70 Grass land No 0 0 0 0 Water areas No 0 0 0 0 Built-up land No 0 0 0 0 Barren areas No 0 0 0 0
Table 3.
Changes in ecological connectivity after reforestation in different counties (km2)
View tableView in ArticleTable 3.
Changes in ecological connectivity after reforestation in different counties (km2)
Counties Reforested area Source increase Corridor increase Pinch increase Aohan 320.98 23.91 29.71 1.65 Horqin-Zuoyizhong 225.45 0.00 0.64 0.00 Naiman 187.31 5.36 4.09 0.14 Horqin-Zuoyihou 157.29 0.01 0.66 0.09 Kulun 153.14 0.00 4.43 0.72 Zhalute 141.31 72.13 1.05 0.14 Keshiketeng 132.20 70.88 8.50 0.01 Wengniute 131.33 18.84 17.02 0.46 Songshan 117.12 28.49 16.04 1.17 Balinzuo 83.49 30.20 1.61 0.00 Kailu 78.92 4.12 0.27 0.26 Horqin 72.94 0.00 0.36 0.00 Alukerqin 68.38 18.32 2.30 0.01 Kalaqin 59.64 27.59 1.56 0.06 Ning County 57.91 6.00 1.01 0.07 Linxi 41.29 20.58 7.02 0.02 Balinyou 40.44 13.66 1.44 0.00 Yuanbaoshan 17.66 1.46 1.59 0.21 Hongshan 7.46 0.00 0.13 0.00 Holingol 0.14 0.00 0.00 0.00
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Xiaojing LIU, Dianfeng LIU, Hongzhuo ZHAO, Jianhua HE, Yaolin LIU. Exploring the spatio-temporal impacts of farmland reforestation on ecological connectivity using circuit theory: A case study in the agro-pastoral ecotone of North China[J]. Journal of Geographical Sciences, 2020, 30(9): 1419
Category: Research Articles
Received: Mar. 15, 2020
Accepted: Jun. 18, 2020
Published Online: Apr. 21, 2021
The Author Email: Dianfeng LIU (liudianfeng@whu.edu.cn)
