延邊朝鮮族自治州NDVI時空變化特征及其與氣候因子的關系

摘要 為明確延邊朝鮮族自治州（以下簡稱延邊州）植被指數變化規律及其對氣候因子的響應機制，利用2000—2022年的MOD13Q1數據，結合降水量、氣溫等資料，通過一元線性回歸法、Theil-Sen Median 趨勢分析、Mann-Kendall檢驗法和相關系數分析法等，從時間和空間2個尺度分析延邊州NDVI變化特征及其與氣溫和降水量的響應程度。結果表明：時間變化上來看，2000—2022年延邊州植被NDVI多年平均值為0.539，呈波動上升趨勢，上升斜率為0.003 6/年。各縣（市）植被NDVI存在差異，但總體均呈現相似的波動上升趨勢。其中，和龍市年均NDVI最高，為0.560，延吉市最低，為0.515。圖們市NDVI年均值上升趨勢最為明顯，為0.004 3/年，和龍市NDVI年均值上升趨勢最慢，為0.003 1/年?？臻g分布上來看，延邊州植被整體覆蓋狀況較好，植被NDVI年均值大于0.6的區域面積占總面積的22.93%，NDVI年均值在0.4～0.6的占67.16%；植被NDVI年均值小于0.4的面積僅占9.91%，主要分布在各縣（市）中心及周邊區域。植被NDVI呈上升趨勢的面積占研究區總面積的94.23%，其中，呈極顯著上升趨勢的面積占71.80%，呈下降趨勢的面積僅占研究區面積的2.48%，零星分布在部分耕地區域。植被NDVI對氣候因子響應方面，延邊州大部分地區NDVI與氣溫、降水量呈正相關，約有67.23%的地區與降水量呈顯著正相關，大于與氣溫呈顯著正相關區域（59.49%），表明全州范圍內NDVI與降水量和氣溫均以正向促進為主，且與降水量的相關性強于氣溫。

關鍵詞 NDVI；時空變化特征；氣候因子；響應程度；延邊州

中圖分類號 Q948.112 文獻標識碼 A 文章編號 0517-6611（2024）21-0187-05

doi：10.3969/j.issn.0517-6611.2024.21.039

開放科學（資源服務）標識碼（OSID）：

The Spatiotemporal Variation Characteristics of NDVI in Yanbian Korean Autonomous Prefecture and Its Relationship with Climate Factors

WANG Jing-jie，ZHAO Jing，LIU Yan-bin et al

（Meteorological Bureau of Yanbian Korean Autonomous Prefecture，Yanji，Jilin 133001）

Abstract In order to clarify the variation law of vegetation index in Yanbian Korean Autonomous Prefecture and its response mechanism to climate factors，MOD13Q1 data from 2000 to 2022 were used，combined with precipitation，temperature and other data.Through univariate linear regression，Theil Sen Median trend analysis，Mann-Kendall test and correlation coefficient analysis，the NDVI variation characteristics of Yanbian Prefecture and their response degree to temperature and precipitation were analyzed from two scales of time and space.The results showed that in terms of temporal variation，the average NDVI of vegetation in Yanbian Prefecture from 2000 to 2022 was 0.539，showing a fluctuating upward trend with an upward slope of 0.003 6 per year.There were differences in vegetation NDVI among various counties and cities，but overall they showed a similar fluctuating upward trend.Among them，Helong City had the highest annual NDVI value at 0.560，while Yanji City had the lowest at 0.515.The annual average increase trend of NDVI in Tumen City was the most obvious，at 0.004 3/year，while the annual average increase trend of NDVI in Helong City was the slowest，at 0.003 1/year.In terms of spatial distribution，the overall vegetation coverage in Yanbian area was good，with 22.93% of the total area having an annual average NDVI greater than 0.6，ranging from 0.4 to 0.6，accounting for 67.16%;the area with vegetation NDVI less than 0.4 accounted for only 9.91%，mainly distributed in the centers and surrounding areas of various counties and cities.The area with vegetation NDVI showing an upward trend accounted for 94.23% of the total area of the study area，of which 71.8% showed a highly significant upward trend，and only 2.48% showed a downward trend，sporadically distributed in some cultivated land areas.In terms of the response of vegetation NDVI to climate factors，in most areas of Yanbian Prefecture，NDVI was positively correlated with temperature and precipitation，with about 67.23% of areas showing a significant positive correlation with precipitation，which was greater than the significant positive correlation with temperature （59.49%）.This indicated that NDVI was mainly positively promoted with precipitation and temperature throughout the state，and the correlation with precipitation was stronger than that with temperature.

Key words NDVI;Spatiotemporal variation characteristics;Climate factors;Response level;Yanbian Prefecture

作者簡介 王警潔（1983—），女，內蒙古寧城人，工程師，從事氣象服務工作與研究?！?br>