赤峰市植被覆盖度时空变化及其与气候因子的关系
张迎杰 , 樊雪丰 , 王海梅 , 孙琳丽
内蒙古师范大学学报(自然科学版) ›› 2024, Vol. 53 ›› Issue (05) : 471 -477.
赤峰市植被覆盖度时空变化及其与气候因子的关系
Spatiotemporal Variations of Vegetation Coverage and Its Relationships with Climate Factors in Chifeng City
基于MODIS ENVI数据,利用像元二分模型计算赤峰市植被覆盖度,并通过Theil-Sen 趋势分析法、Mann-Kendall显著性检验法、变异系数及偏相关性分析法,研究2000—2022年赤峰市植被覆盖度的时空变化特征及其与气候因子的相关性,结果显示:(1)赤峰市多年平均植被覆盖度为59.4%,年均增长率为0.4%。研究时段内,不同等级植被覆盖度的时序差异明显,中低、中植被覆盖度的面积占比显著下降,高植被覆盖度的面积占比显著增加。在空间上,赤峰市植被覆盖度呈增加趋势的面积占比为71.9%,其中33.6%的区域呈显著增加趋势。(2)赤峰市中等覆盖度的面积最大(占28.2%),主要分布在中部及西北部地区;中高及高覆盖度区主要分布在沿山地区;中低、低覆盖度和裸地主要集中在浑善达克沙地和科尔沁沙地。植被覆盖度低的地区,波动性强。(3)近23年,赤峰市降水呈显著增加趋势,变化率为5.0 mm/a,年平均气温增加不显著。(4)植被覆盖度与降水、气温整体上均呈正偏相关关系,且降水对植被覆盖度的影响强于气温,说明降水是影响赤峰市植被生长的主导气候因子。
Fractional vegetation cover (FVC) is an important indicator for reflecting the ecological environment quality. The pixel dichotomy model was used to calculate the FVC data set in Chifeng City based on the data collected by MODIS ENVI products. The Theil-Sen trend analysis, Mann-Kendall significance test, coefficient of variation method and partial correlation analysis were implemented to analyze the temporal and spatial variation characteristics of FVC and its correlation with climatic factors in Chifeng City from 2000 to 2022. The results showed that (1) the multi-year average FVC value in Chifeng City was 59.4%, and the average annual growth rate was 0.4%, different level of FVC presented significant differences in time series, and the proportions of medium-low level and medium level FVC significantly decreased, while the proportion of high level FVC significantly increased, and in term of the space, the area in increasing trend for FVC in Chifeng City accounted for 71.9%, of which 33.6 % showed a significantly increasing trend; that (2) the medium level FVC area was the largest proportion, accounted for 28.2%, mainly located in the central and northwestern regions of Chifeng City, the medium-high level and high level FVC areas were mainly located in the mountain areas, the medium-low level, low level FVC and bare land were mainly located in Hunshandake Sandy Land and Horqin Sandy Land, and the lower FVC areas presented high instability; that (3) in the past 23 years, the precipitation in Chifeng City increased significantly, with a changing rate of 5.0 mm/a, while the increase in annual average temperature was not significant; that (4) the FVC had the positive partial correlation with precipitation and temperature on the whole, and the influence of precipitation on FVC was stronger than that of temperature, indicating that the precipitation was the dominant climate factor for vegetation growth in Chifeng City.
植被覆盖度 / 像元二分模型 / 时空变化 / 趋势分析 / 相关性分析
fractional vegetation cover / pixel dichotomy model / spatiotemporal variation / trend analysis / correlation analysis
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