| 引用本文: | 寇杰锋,杨 超,张莹莹,等.黄河中下游伊洛河流域2002—2021年植被覆盖度时空变化及影响因素分析[J].灌溉排水学报,2024,43(1):89-96. |
| KOU Jiefeng,YANG Chao,ZHANG Yingying,et al.黄河中下游伊洛河流域2002—2021年植被覆盖度时空变化及影响因素分析[J].灌溉排水学报,2024,43(1):89-96. |
|
| 摘要: |
| 【目的】探究黄河中下游伊洛河流域2002—2021年植被覆盖度的时空变化规律及影响因素。【方法】基于2002、2007、2011、2016、2021年Landsat卫星数据，结合像元二分模型提取该流域植被覆盖度，利用变异系数和线性回归分析揭示植被覆盖度的时空变化规律，从自然因素和人类活动因素2个方面分析流域植被覆盖度时空变化的影响因素。【结果】2002—2021年，流域西部、南部源头山区为高植被覆盖度地区，自西向东沿河道区域及中北部地区的植被覆盖度较低，东部为低植被覆盖度区域。流域高和较高覆盖度面积占比合计为65.29%，中等植被覆盖度占比为17.66%，较低、低覆盖度占比为17.05%。流域整体植被覆盖度较高，且呈先降低后升高的趋势。2002—2021年，植被覆盖度较为稳定的区域占比为44.14%，植被覆盖度有所改善的区域占比为32.25%，轻度退化区域占比为17.27%，明显退化区域占比为6.34%。自然因素对植被覆盖度的影响程度由高到低依次为高程、气温、降水和坡度。植被覆盖度随高程、降水和坡度的增加而增加，随温度的增加而降低。人类活动的正向影响大于负面影响，是导致植被覆盖度逐渐增长的重要因素。【结论】伊洛河流域2002—2021年植被覆盖度较高，且呈逐渐增加趋势，高程、气温和降水是影响其空间分布的主要因素，人类活动对其增加有促进作用。 |
| 关键词: 伊洛河流域；植被覆盖度；时空变化；影响因素 |
| DOI：10.13522/j.cnki.ggps.2023239 |
| 分类号: |
| 基金项目: |
|
| Spatio-temporal variation of fractional vegetation cover and its influencing factors in the Yiluo River basin of the middle and lower reaches of the Yellow River from 2002 to 2021 |
|
KOU Jiefeng, YANG Chao, ZHANG Yingying, ZHI Lu, ZHANG Xiang, PENG Dinghua, LIU Zhe
|
|
1. Ecological and Environmental Monitoring and Scientific Research Center, Yellow River Basin Ecological and Environmental Administration Ministry of Ecology and Environment, Zhengzhou 450004, China; 2. Ecological and Environmental Monitoring and Scientific Research Center, Yangtze River Basin Ecological and Environmental Administration Ministry of Ecology and Environment, Wuhan 430010, China; 3.Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430077, China; 4. School of Geography and Tourism, Zhengzhou Normal University, Zhengzhou 450044, China
|
| Abstract: |
| 【Objective】To explore the spatio-temporal variation of fractional vegetation coverage (FVC) and its influencing factors in the Yiluo River basin from 2002 to 2021, middle and lower reaches of the Yellow River.【Method】 In this research, the data of Landsat series satellites in 2002, 2007, 2011, 2016 and 2021 were selected and combined with pixel binary model to extract the vegetation coverage of this basin. The coefficient of variation and linear regression analysis method were used to reveal the spatial-temporal variation of vegetation coverage in this basin. The influence of natural factors and human activity factors on the temporal and spatial changes is analyzed. 【Result】From 2002 to 2021, the source mountains in the Western and Southern parts of the basin are high FVC areas, while the FVC is low along the river course from West to East and in the central and Northern parts of the basin. The Eastern part is low FVC area. The proportion of high and relatively high FVC area was 65.29%. Medium FVC accounted for 17.66%, low and relatively low coverage accounted for 17.05%. The overall vegetation coverage was high, and the average FVC shows a decreasing trend, and then gradually increases. The FVC of the basin was basically stable in 44.14%, improved area in 32.25%, and slightly degraded area in 17.27%. The proportion of obvious degradation area was 6.34%. The influence degree of natural factors on FVC from high to low is elevation, temperature, precipitation and slope.The FVC increases with the increase of elevation, precipitation and slope, and decreases with the increase of temperature. The positive effect of human activities on FVC was slightly greater than the negative effect, which became an important factor promoting its growth trend. 【Conclusion】From 2002 to 2021, the vegetation coverage in the Yiluo River Basin was relatively high and gradually increased. Elevation, temperature and precipitation were the main factors affecting its spatial distribution, and human activities promoted its increase. |
| Key words: Yiluo River basin; fractional vegetation cover; spatial and temporal change; influencing factors |
