[1]刘洋洋,任涵玉,呼天明,等.中国草地NDVI时空动态对多尺度干旱的响应[J].水土保持研究,2022,29(01):153-161+168.
　LIU Yangyang,REN Hanyu,Hu Tianming,et al.Spatiotemporal Dynamics of NDVI of Grassland and Its Response to Multi-Scale Drought in China[J].Research of Soil and Water Conservation,2022,29(01):153-161+168.
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中国草地NDVI时空动态对多尺度干旱的响应

《水土保持研究》[ISSN:1005-3409/CN:61-1272/P] 卷: 29 期数: 2022年01期 页码: 153-161+168 栏目: 出版日期: 2022-02-20
Title:
Spatiotemporal Dynamics of NDVI of Grassland and Its Response to Multi-Scale Drought in China
文章编号:
1005-3409(2022)01-0153-09
作者:
刘洋洋1, 任涵玉1, 呼天明1, 杨培志1, 巴桑参木决1, 张 伟1, 张志新1, 温仲明1, 章钊颖2
(1.西北农林科技大学 草业与草原学院, 陕西 杨凌 712100; 2.南京大学 国际地球系统科学研究所, 南京 210023)
Author(s):
LIU Yangyang1, REN Hanyu1, Hu Tianming1, Yang Peizhi1, BASANG Canmujue1, ZHANG Wei1, ZHANG Zhixin1, WEN Zhongming1, ZHANG Zhaoying2
(1.College of Grassland Agriculture, Northwest A&F University, Yangling, Shaanxi 712100, China; 2.International Institute for Earth System Sciences, Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, Nanjing University, Nanjing 210023, China)
关键词:
多时间尺度;  SPEI指数;  最大相关系数;  干旱响应尺度
Keywords:
multi time scale;  SPEI index;  maximum correlation coefficient;  drought response scale
分类号:
K903
文献标志码:
A
摘要:
草地对干旱的响应较其他植被类型更为敏感,且不同草地类型在不同气候区干旱的响应具有较大差异,因此分气候区探究不同草地类型对干旱的响应机制对草地资源保护具有重大意义。基于植被Normalized Difference Vegetation Index(NDVI)、草地覆被及标准化蒸散指数(SPEI)数据,分析1982—2015年中国不同气候区不同草地类型植被NDVI的时空动态及其与SPEI的关系,并确定NDVI与SPEI指标最大相关系数所对应的干旱时间尺度,结合气象数据探究气温、降水及水平衡因素对草地干旱响应的影响状况。结果表明:中国草地NDVI呈现出极显著增加趋势(0.004/a)。草地NDVI呈显著增加的比例为15.62%,集中在华北平原地区、四川、云南、广西及西藏的东南部地区。草地SPEI值呈不显著增加趋势(0.05/10 a),其中显著变干的区域集中在内蒙古中部和宁夏地区。草地NDVI与SPEI指数呈显著正相关的区域集中在内蒙古、青海省南部及新疆北部地带。内蒙古、新疆、青海省北部及西藏南部地区的草地NDVI对干旱响应的时间尺度较短,而青海东南部及西藏中部草地NDVI对干旱响应的时间尺度较长。高山亚高山草甸和草甸区域植被NDVI与SPEI的相关性最强,且对干旱的响应时间尺度较长,而荒漠草地对干旱的响应时间尺度较短; 与湿润区域相比,干旱区域草地NDVI与SPEI的相关性更强,且对干旱响应的时间尺度更短。降水是草地响应干旱的最主要因素,水平衡次之,而气温的影响较小。
Abstract:
The response of grassland to drought is more sensitive than other vegetation types, and the responses of different grassland types to drought in different climate regions are quite different. Therefore, it is of great significance to explore the response mechanism of different grassland types to drought in different climate regions for grassland resource protection. Based on vegetation NDVI data, grassland cover data and multi-scale SPEI index, the temporal and spatial dynamic trend of vegetation NDVI and its relationship with SPEI in different climatic regions(arid, semi-arid, semi humid and humid)and different grassland types from 1982 to 2015 were analyzed, and the drought time corresponding to the maximum correlation coefficient between NDVI and SPEI index in different climatic regions and grassland types was determined by combining with meteorological data, the effects of temperature, precipitation and water balance on grassland drought response mechanism were explored. The results show that NDVI of grassland in China increased significantly(0.004/a). The average value of NDVI in humid area was the highest(0.37), and the average value of NDVI in arid area was the lowest(0.24). Grassland NDVI in each climate region showed a very significant upward trend, and the increase rate in humid area was higher than that in arid area. Grassland NDVI mainly significantly increased in the North China Plain, Sichuan, Yunnan, Guangxi and the southeast of Tibet. During this period, SPEI value of grassland area showed no significant increase trend(0.05/10 a), in which 26.67% of grassland area dried significantly, and concentrated in central Inner Mongolia and Ningxia. The areas with significant positive correlation between NDVI and SPEI index concentrated in Inner Mongolia, southern Qinghai Province and northern Xinjiang. The time scales of NDVI response to drought in Inner Mongolia, Xinjiang, northern Qinghai Province and southern Tibet were shorter, while those in southeastern Qinghai and central Tibet were longer. The correlation between NDVI and SPEI was the strongest in alpine and subalpine meadows and meadow regions, and the response time scale to drought was longer, while the response time scale of desert grassland to drought was shorter. Compared with the humid area, the correlation between NDVI and SPEI was stronger in arid area, and the response time scale to drought was shorter. Precipitation was the most important factor on grassland response to drought, followed by water balance and temperature.

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备注/Memo

收稿日期:2021-01-11 修回日期:2021-01-28
资助项目:西北农林科技大学博士科研启动项目(2452020186); 陕西省林业科学院科技创新计划专项(SXLK2020-0204); 中国博士后科学基金(2020M683594)
第一作者:刘洋洋(1991—),男,河南洛阳人,博士,副教授,主要从事草地遥感及陆地生态系统碳循环等研究。E-mail:hnlylcbtks@163.com
任涵玉(1996—),女,甘肃白银人,博士,研究方向为草地遥感。E-mail:1805223632@nwafu.edu.cn
通信作者:温仲明(1968—),男,陕西定边人,博士,研究员,主要从事黄土高原植被恢复与重建、草地生态恢复等有关研究工作。E-mail:zmwen@ms.iswc.ac.cn

更新日期/Last Update: 2022-02-20