基于遥感数据的若尔盖地区2001-2015年植被生育期特征及其对气候变化的响应分析

	基于遥感数据的若尔盖地区2001-2015年植被生育期特征及其对气候变化的响应分析
其他题名	Characteristics of Vegetation Growth Period and Its Response to Climate Change in Zoige Area from 2001 to 2015 Based on Remote Sensing Data
	李丹利 1; 李龙国 2; 贺宇欣 3; 苟思 4; 赵娜娜 5
	2019
发表期刊	工程科学与技术
ISSN	2096-3246
卷号	51 期号:1 页码:165-172
摘要	NDVI (normalized difference vegetation index) can reflect the changes of vegetation growth.It has been widely used to monitor multiscale vegetation growth conditions.Based on MODIS remote sensing data,the time series of NDVI from 2001 to 2015 in Zoige area were reconstructed by filtering software TIMESAT,and three key vegetation growth properties were extracted:The start of vegetation growth period,the length of vegetation growth period and the maximum NDVI value.The key climatic factors affecting the vegetation growth period were analyzed.The results showed that:1) The average start time of vegetation growth period increased,and the average length of vegetation growth period prolonged,while and the maximum NDVI values had no significant changes from 2001 to 2015.2) The average vegetation growth properties had no obvious regular pattern of change in spatial distribution.As the elevation increased,the start of vegetation growth period postponed,the length of vegetation growth period shortened visibly,and the maximum of NDVI did not change obviously.3) Temperature is the main factor that impacted vegetation growth period in Zoige area.Increasing accumulated temperature in April and May could advance the start time of vegetation growth period.The average length of vegetation growth period would be longer with the higher accumulated temperature in September and October.The increase of accumulated temperature from the start time of growth period to the time of the maximum NDVI also increased the maximum value of NDVI.4) The correlation between NDVI and SPI was not significant.Therefore,the vegetation in Zoige area had low dependence on precipitation.The findings showed the changes of vegetation growth period in Zoige area and their response to climate over the past 15 years.The methods used in this paper can provided a useful tool for remote sensing monitoring of vegetation characteristics at large scales.
其他摘要	遥感NDVI(归一化植被指数)数据能较好地反映植被生长变化情况,已广泛应用于多尺度植被物候监测。基于MODIS卫星每16 d的NDVI遥感数据,通过时间序列滤波软件TIMESAT重建了若尔盖地区2001-2015年 NDVI时间序列,提取出植被3个关键生育期信息-植被生育期起始时间、植被生育期长度和生育期内NDVI峰值;分析了影响植被生育期的关键气候因子。结果表明:1)2001-2015若尔盖地区植被平均生育期起始时间提前,生育期长度延长,NDVI峰值无明显变化。2)植被平均生育期在空间分布上无明显递变规律;随海拔梯度升高,植被生育期起始时间推迟,生育期长度缩短,NDVI峰值减小。3)温度是影响若尔盖地区植被生育期的主要气候因素,4、5月积温升高促进植被生育期起始时间提前(相关系数\|R\|=0.79);9、10月积温升高有利于植被生育期结束时间推后,使得生植被育期长度延长(相关系数\|R\|=0.73);从植被生育期起始至NDVI峰值出现时间段内积温的升高也使得植被NDVI峰值升高(相关系数\|R\|=0.68)。4)植被NDVI与SPI(标准化降水指数)相关性不高,若尔盖地区植被生长对降水变化不敏感。研究结果较为真实地反映了2001-2015年若尔盖区域植被的生育期特征及其对气候变化的响应,其方法可应用于遥感监测区域范围内植被变化特征。
关键词	遥感归一化植被指数(NDVI) 生育期积温标准化降水指数(SPI) remote sensing normalized difference vegetation index(NDVI) vegetation growth period accumulated temperature standardized precipitation index(SPI)
收录类别	CSCD
语种	中文
WOS关键词	Agriculture
WOS研究方向	Science & Technology
WOS类目	AGRICULTURE MULTIDISCIPLINARY
CSCD记录号	CSCD:6429202
引用统计	被引频次：2[CSCD] [CSCD记录]
文献类型	期刊论文
专题	任务一_子任务一循证社会科学证据集成任务一
作者单位	1.四川大学水利水电学院, 水力学与山区河流开发保护国家重点实验室, 成都, 四川 610065, 中国 2.四川大学水利水电学院, 水力学与山区河流开发保护国家重点实验室, 成都, 四川 610065, 中国 3.四川大学水利水电学院, 水力学与山区河流开发保护国家重点实验室, 成都, 四川 610065, 中国 4.四川大学水利水电学院, 水力学与山区河流开发保护国家重点实验室, 成都, 四川 610065, 中国 5.中国林业科学研究院湿地研究所;;中国水利水电科学研究院, ;;流域水循环模拟与调控国家重点实验室, ;;, 北京;;北京 100091;;100038, 中国
推荐引用方式 GB/T 7714	李丹利,李龙国,贺宇欣,等. 基于遥感数据的若尔盖地区2001-2015年植被生育期特征及其对气候变化的响应分析[J]. 工程科学与技术,2019,51(1):165-172.
APA	李丹利,李龙国,贺宇欣,苟思,&赵娜娜.(2019).基于遥感数据的若尔盖地区2001-2015年植被生育期特征及其对气候变化的响应分析.工程科学与技术,51(1),165-172.
MLA	李丹利,et al."基于遥感数据的若尔盖地区2001-2015年植被生育期特征及其对气候变化的响应分析".工程科学与技术 51.1(2019):165-172.