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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第46卷

期数:

2024年第03期

页码:

321-333

栏目:

环境与可持续发展

出版日期:

2024-05-15

文章信息/Info

Title:

Changing Trend of NDVI and Its Influencing Factors in the Permafrost Regions of the Northern Hemisphere from 2000 to 2021

文章编号:

1672-6561(2024)03-0321-13

作者:

李羽莹¹; 2; 3; 刘桂民^1*; 吴晓东²; 3; 王耀新¹; 康国慧¹; 赵俊¹; 董云霞¹; 王琳¹

(1. 兰州交通大学 环境与市政工程学院,甘肃 兰州 730070; 2. 中国科学院西北生态环境资源研究院 冰冻圈科学国家重点实验室,甘肃 兰州 730000; 3. 中国科学院西北生态环境资源研究院 藏北高原冰冻圈特殊环境与灾害国家野外科学观测研究站,甘肃 兰州 730000)

Author(s):

LI Yu-ying¹; 2; 3;  LIU Gui-min^1*;  WU Xiao-dong²; 3;  WANG Yao-xin¹;  KANG Guo-hui¹; ZHAO Jun¹;  DONG Yun-xia¹;  WANG Lin¹

(1. School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China; 2. State Key Laboratory of Cryosphere Science, Northwest Institute of Eco-environment and Resources, ChineseAcademy of Sciences, Lanzhou 730000, Gansu, China; 3.Cryosphere Research Station on the Qinghai-Tibet Plateau, Northwest Institute ofEco-environmentandResources, Chinese Academy of Sciences,Lanzhou 730000, Gansu, China)

关键词:

归一化植被指数;  气温;  降水;  积雪;  活动层厚度;  时空变化;  皮尔逊相关性分析;  多年冻土区

Keywords:

NDVI;  temperature;  precipitation;  snow cover;  active layer thickness;  spatial-temporal change;  Pearson correlation analysis;  permafrost region

分类号:

P95

DOI:

10.19814/j.jese.2023.12054

文献标志码:

A

摘要:

气候变暖正在导致北半球多年冻土区的土地覆被类型和植被生物量发生快速变化,而不同冻土类型区和不同土地覆被类型区对气候变化的响应程度尚不清楚。基于Slope趋势分析和皮尔逊相关性分析,量化了2000～2021年北半球多年冻土区归一化植被指数(NDVI)的时空变化及其对气候变化的响应。结果表明:约21.43%的多年冻土区NDVI值表现出显著增长趋势,其中连续和不连续多年冻土区的NDVI值增长速率是零星多年冻土区的2～3倍。在月尺度上,约33.75%多年冻土区的NDVI值在6月呈显著增长趋势,其中连续多年冻土区和灌丛植被类型区的增长速率最快。气温、降水量和活动层厚度均呈显著上升趋势,积雪覆盖率呈下降趋势。气温升高对俄罗斯等低纬度冻土区的植被生长起到了促进作用; 降水在蒙古高原等一些特定干旱区对植被生长具有促进作用,但在俄罗斯中部和加拿大南部存在不利影响; 积雪对于俄罗斯南部等积雪覆盖较低地区的植被生长有促进作用,而对于北极等积雪覆盖较高的地区存在不利影响; 活动层厚度的增加有助于俄罗斯北部等冻土区的植被加速生长。总之,北半球多年冻土区植被整体呈增长趋势,气温升高仍然是北半球多年冻土区植被生长的主控因素,但不同多年冻土类型区的NDVI值增长有着明显的月份差异,因此在以后植被模型的发展和改进时需要考虑月份的差异。

Abstract:

Climate warming is leading to rapid changes in land cover types and vegetation biomass in the permafrost regions of the Northern Hemisphere. However, to what extent of the vegetation growth responding to climate change in different permafrost regions and different land cover types regions is still unknown. The spatial-temporal change of normalized difference vegetation index(NDVI)and its response to climate variables from 2000 to 2021 were analyzed based on Slope trend analysis and Pearsoncorrelation analysis. The results show that about 21.43% of the NDVI in the permafrostregionsshows a significant increasing trend, in which the increasing rates of NDVI in the continuous and discontinuous permafrost regionsare 2-3 times higher than that in the sporadic permafrostregion.On the monthly scale, about 33.75% of the NDVI in the permafrostregionsshows a significant increasing trend in June, with the fastest increasing rates in continuous permafrostregionsand scrub vegetation typeregions.Temperature, precipitation, and active layer thickness exhibit a significant increasing trend, while snow cover shows a decreasing trend. Warmer temperatures promote vegetation growth in low-latitude permafrost regions such as Russia. Precipitation promotes vegetation growth in some specific arid zones such as Mongolian Plateau, but has a negative effect in the central Russia and the southern Canada. Snowpack promotes vegetation growth in areas with low snow cover, such as the southern Russia, but has a negative effect in areas with high snow cover, such as the Arctic. In general, the vegetation within the permafrost region of the Northern Hemisphere is experiencing an overall growth trend, and that warmer temperatures are still the main controlling factor for vegetation growth in the permafrost region of the Northern Hemisphere. The increase in theactive layerthicknesscontributes to the accelerated growth of vegetation in permafrost regions such as the northern Russia. In addition, the growth of NDVI in different permafrost types exhibits noticeable monthly variations, highlighting the need to consider these differences in future developments and improvements of vegetation models.

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相似文献/References:

[1]潘金金,任宗萍*,胥世斌,等.宁夏不同植被类型NDVI变化特征及其对气候的响应[J].地球科学与环境学报,2023,45(04):819.
　PAN Jin-jin,REN Zong-ping*,XU Shi-bin,et al.Variation Characteristics of NDVI of Different Vegetation Types in Ningxia, China and Their Responses to Climate[J].Journal of Earth Sciences and Environment,2023,45(03):819.

备注/Memo

备注/Memo:

收稿日期:2023-12-28; 修回日期:2024-03-27
基金项目:国家自然科学基金项目(41941015,32061143032); 中国科学院“西部之光”人才培养计划项目
*通信作者:刘桂民(1977-),女,甘肃靖远人,教授,博士研究生导师,理学博士,E-mail:liuguimin@lzjtu.edu.cn。

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