Arid Land Geography ›› 2023, Vol. 46 ›› Issue (11): 1768-1777.doi: 10.12118/j.issn.1000-6060.2023.027
• Ecology and Environment • Previous Articles Next Articles
ZHUO Jing1,2(),HU Hao1,HE Huijuan3,WANG Zhi1,YANG Chengrui1
Received:
2023-01-13
Revised:
2023-03-13
Online:
2023-11-25
Published:
2023-12-05
ZHUO Jing,HU Hao,HE Huijuan,WANG Zhi,YANG Chengrui. Spatiotemporal variation and driving factors of ecological vulnerability in the Loess Plateau of northern Shaanxi[J].Arid Land Geography, 2023, 46(11): 1768-1777.
Tab. 1
Grading standard and weight of ecological vulnerability assessment index of Loess Plateau in northern Shaanxi Province"
因素(权重) | 指标 | 微弱影响 | 轻度影响 | 中度影响 | 高度影响 | 极严重影响 | 指标权重 |
---|---|---|---|---|---|---|---|
生态敏感性(0.35) | 坡度/(°) | ≤2 | 2~5 | 5~10 | >25 | 10~25 | 0.25 |
植被覆盖度/% | 0~20 | 20~40 | 40~60 | 80~100 | 60~80 | 0.30 | |
土地利用 | 林木 | 草地、水体 | 耕地 | 未利用地 | 居民地、工矿用地 | 0.45 | |
分级赋值 | 10 | 30 | 50 | 90 | 70 | - | |
生态恢复力(0.50) | 年降水量/mm | 0~200 | 200~370 | 370~400 | 550~1500 | 400~550 | 0.25 |
植被覆盖度/% | 0~20 | 20~40 | 40~60 | 80~100 | 60~80 | 0.25 | |
土地利用 | 林木 | 草地、水体 | 耕地 | 未利用地 | 居民地、工矿用地 | 0.50 | |
分级赋值 | 10 | 30 | 50 | 90 | 70 | - | |
生态压力 | 暴雨日数/d | <20 | 20~28 | 29~35 | 42~60 | 35~42 | 0.15 |
(0.15) | 分级赋值 | 10 | 30 | 50 | 90 | 70 | - |
Tab. 2
Classification of ecological vulnerability of Loess Plateau in northern Shaanxi Province"
脆弱性指数 | 脆弱性分级 | 生态特征 |
---|---|---|
70~100 | 高度脆弱 | 生态系统不完善,系统不稳定,自我修复抗干扰能力弱,生态问题十分明显 |
50~70 | 中度脆弱 | 生态系统尚可维持,系统较为不稳定,自我修复抗和干扰能力较弱,生态问题明显 |
25~50 | 低度脆弱 | 生态系统比较完整,系统较为稳定,自我修复和抗干扰能力较强,生态环境脆弱性较低,生态问题较明显 |
0~25 | 一般脆弱 | 生态系统结构完整,系统稳定,自我修复能力和抗干扰能力强,生态环境脆弱性低,无明显生态问题 |
Tab. 3
Change of ecological vulnerability grade area in Loess Plateau of northern Shaanxi Province"
生态脆弱性 | 1997年 | 2021年 | 面积变化/km2 | 变化幅度/% | |||
---|---|---|---|---|---|---|---|
面积/km2 | 占比/% | 面积/km2 | 占比/% | ||||
一般脆弱 | 7015.40 | 8.4 | 13398.51 | 16.0 | 6383.11 | 91.0 | |
低脆弱 | 37410.98 | 44.7 | 64588.60 | 77.1 | 27177.62 | 72.7 | |
中脆弱 | 37077.68 | 44.3 | 5674.41 | 6.8 | -31403.28 | -84.7 | |
高脆弱 | 2269.73 | 2.7 | 112.28 | 0.1 | -2157.45 | -95.1 |
Tab. 4
Change of ecological vulnerability grade in Loess Plateau of northern Shaanxi"
生态脆弱性变化 | 生态脆弱性等级变化 | 占对应变化面积的比例/% |
---|---|---|
生态脆弱性降低 | 低脆弱改善到一般脆弱 | 16.9 |
中脆弱改善到一般脆弱 | 2.6 | |
中脆弱改善到低脆弱 | 75.3 | |
高脆弱改善到一般脆弱 | 0.1 | |
高脆弱改善到低脆弱 | 4.1 | |
高脆弱改善到中脆弱 | 1.0 | |
合计 | 100.0 | |
生态脆弱性增加 | 一般脆弱增加至低脆弱 | 52.9 |
一般脆弱增加至中脆弱 | 0.1 | |
低脆弱增加至中脆弱 | 45.6 | |
低脆弱增加至高脆弱 | 0.4 | |
中脆弱增加至高脆弱 | 1.0 | |
合计 | 100.0 |
Tab. 5
Statistics of ecological vulnerability grade area in each administrative region"
区域 | 年份 | 面积变化 | 一般脆弱 | 低脆弱 | 中脆弱 | 高脆弱 |
---|---|---|---|---|---|---|
铜川市 | 1997 | 面积/km2 | 800.96 | 2982.87 | 102.74 | 0.00 |
占比/% | 20.6 | 76.7 | 2.7 | 0.0 | ||
2021 | 面积/km2 | 1655.68 | 2155.72 | 75.17 | 0.00 | |
占比/% | 42.6 | 55.5 | 1.9 | 0.0 | ||
延安市 | 1997 | 面积/km2 | 6160.05 | 20689.20 | 9899.02 | 142.92 |
占比/% | 16.7 | 56.1 | 26.8 | 0.4 | ||
2021 | 面积/km2 | 10798.75 | 25692.80 | 342.37 | 0.02 | |
占比/% | 29.3 | 69.8 | 0.9 | 0.0 | ||
榆林市 | 1997 | 面积/km2 | 54.40 | 13738.91 | 27075.92 | 2126.80 |
占比/% | 0.1 | 32.0 | 63.0 | 4.9 | ||
2021 | 面积/km2 | 944.08 | 36740.08 | 5256.86 | 112.26 | |
占比/% | 2.2 | 85.3 | 12.2 | 0.3 |
Tab. 6
Statistics of ecological vulnerability grade area in each ecological function area"
区域 | 年份 | 面积变化 | 一般脆弱 | 低脆弱 | 中脆弱 | 高脆弱 |
---|---|---|---|---|---|---|
风沙区 | 1997 | 面积/km2 | 18.54 | 5500.66 | 7434.29 | 866.64 |
占比/% | 0.1 | 39.8 | 53.8 | 6.3 | ||
2021 | 面积/km2 | 115.59 | 11439.82 | 2059.91 | 52.72 | |
占比/% | 0.8 | 83.7 | 15.1 | 0.4 | ||
黄桥林区 | 1997 | 面积/km2 | 3374.42 | 5940.84 | 154.77 | 0.00 |
占比/% | 35.6 | 62.7 | 1.6 | 0.0 | ||
2021 | 面积/km2 | 5495.91 | 4416.93 | 14.51 | 0.00 | |
占比/% | 55.4 | 44.5 | 0.1 | 0.0 | ||
退耕还林区 | 1997 | 面积/km2 | 3622.45 | 25969.48 | 29488.63 | 1403.09 |
占比/% | 6.0 | 42.9 | 48.8 | 2.3 | ||
2021 | 面积/km2 | 7787.01 | 48731.85 | 3599.98 | 59.56 | |
占比/% | 12.9 | 81.0 | 6.0 | 0.1 |
Tab. 7
Statistics of ecological vulnerability grade area at different slope"
坡度 | 年份 | 面积变化 | 一般脆弱 | 低脆弱 | 中脆弱 | 高脆弱 |
---|---|---|---|---|---|---|
<2° | 1997 | 面积/km2 | 144.65 | 5753.43 | 4660.24 | 27.97 |
占比/% | 1.4 | 54.3 | 44.0 | 0.3 | ||
2021 | 面积/km2 | 545.32 | 8368.21 | 1657.81 | 14.95 | |
占比/% | 5.2 | 79.0 | 15.7 | 0.1 | ||
变化幅度/% | 277.0 | 45.4 | -64.4 | -46.5 | ||
2°~6° | 1997 | 面积/km2 | 402.92 | 4648.04 | 2997.13 | 924.63 |
占比/% | 4.5 | 51.8 | 33.4 | 10.3 | ||
2021 | 面积/km2 | 1113.91 | 6875.96 | 941.85 | 40.99 | |
占比/% | 12.4 | 76.6 | 10.5 | 0.5 | ||
变化幅度/% | 176.5 | 47.9 | -68.6 | -95.6 | ||
6°~15° | 1997 | 面积/km2 | 1273.20 | 7049.72 | 7658.53 | 843.00 |
占比/% | 7.6 | 41.9 | 45.5 | 5.0 | ||
2021 | 面积/km2 | 3292.88 | 12309.25 | 1182.01 | 40.32 | |
占比/% | 19.6 | 73.2 | 7.0 | 0.2 | ||
变化幅度/% | 158.6 | 74.6 | -84.6 | -95.2 | ||
15°~25° | 1997 | 面积/km2 | 2680.94 | 10125.26 | 11336.66 | 267.78 |
占比/% | 11.0 | 41.5 | 46.4 | 1.1 | ||
2021 | 面积/km2 | 5494.37 | 17919.39 | 990.46 | 6.42 | |
占比/% | 22.5 | 73.4 | 4.1 | 0.0 | ||
变化幅度/% | 104.9 | 77.0 | -91.3 | -97.6 | ||
25°~35° | 1997 | 面积/km2 | 2117.36 | 7826.34 | 8281.02 | 155.90 |
占比/% | 11.5 | 42.6 | 45.1 | 0.8 | ||
2021 | 面积/km2 | 2639.64 | 15038.90 | 697.56 | 4.52 | |
占比/% | 14.4 | 81.8 | 3.8 | 0.0 | ||
变化幅度/% | 24.7 | 92.2 | -91.6 | -97.1 | ||
>35° | 1997 | 面积/km2 | 485.93 | 1975.48 | 2143.57 | 50.39 |
占比/% | 10.4 | 42.4 | 46.0 | 1.1 | ||
2021 | 面积/km2 | 396.42 | 4050.07 | 203.80 | 5.03 | |
占比/% | 8.5 | 87.0 | 4.4 | 0.1 | ||
变化幅度/% | -18.4 | 105.0 | -90.5 | -90.0 |
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