干旱区生态环境知识资源中心(Arid): 藏北高原植被物候时空动态变化的遥感监测研究

Arid

	藏北高原植被物候时空动态变化的遥感监测研究
其他题名	Spatio-temporal variation of vegetation phenology in the Northern Tibetan Plateau as detected by MODIS remote sensing
	宋春桥 1; 游松财 2; 柯灵红 1; 刘高焕 1; 钟新科 1
来源期刊	植物生态学报
ISSN	1005-264X
出版年	2011
卷号	35 期号:8 页码:853-863
中文摘要	利用遥感数据提取的植被物候格局及时空变化特征能很好地反映区域尺度上植被对全球变化的响应。目前关于青藏高原地区植被物候的少量报道基本上是基于物候站点的观测记录展开分析的。该文基于非对称高斯拟合算法重建了藏北高原2001-2010年的MODISEVI(增强型植被指数)时间序列影像,然后利用动态阈值法提取整个藏北高原2001-2010年植被覆盖的重要物候信息,包括植被返青期、枯黄期与生长季长度,分析了植被物候10年间平均状况的空间分异特征以及年际变化情况,并结合站点观测记录分析了气温和降水对植被物候变化的影响,结果表明:(1)藏北高原植被返青期在空间上表现出从东南到西北逐渐推迟的水平地带性与东南高山峡谷区的垂直地带性相结合的特征,近60%区域的植被返青期提前,特别是高山地区;(2)植被枯黄期的年际变化不太明显,大部分地区都表现为自然的年际波动;(3)生长季长度的时空变化特征由植被返青期和枯黄期二者决定,但主要受返青期提前影响,大部分地区生长季长度延长;(4)研究区内不同气候区划植被物候的年际变化以那曲高山谷地亚寒带半湿润区和青南高原亚寒带半干旱区的植被返青期提前和生长季延长程度最为明显;(5)基于气象台站数据分析气候变化对物候的影响发现,返青期提前及生长季延长主要受气温升高的影响,与降水的关系尚不明确。
英文摘要	Aim Estimating regional variation in vegetation phenology from time-series remote sensing data is important in global climate change studies.However,there are few studies on vegetation phenology for the Qinghai-Tibet Pla-teau and most are based on field records of stations.Methods We utilized the dynamic threshold method to explore vegetation phenological metrics (greenup date,length of season and senescence date)of typical grassland in the Northern Tibetan Plateau.We used time-series TERRA/MODIS EVI data for 2001-2010 reconstructed by the asymmetric Gaussian function fitting method to analyze spatial pattern and differentiation of vegetation phenology and its inter-annual variation and to examine the relationship between phenological variation and climate changes.Important findings The spatial pattern of date of vegetation greenup was embodied by transition from southeast to northwest and vertical zonation in the mountainous topography of the southeast.The vegetation greenup date in approximately sixty percent of the northern Tibetan Plateau had advanced,especially in high mountains.Inter-annual variation of vegetation senescence date was not obvious,and most of the region had natural inter-annual fluctuations.The variation of growing season length is influenced by greenup and senescence dates,but was chiefly affected by advanced greenup date lengthening the growing season.Among the four different climatic zones in the study area,the mountain and valley Nagqu sub-arctic and sub-humid zone and the southern Qinghai sub-arctic and semi-arid zone had the most apparent advanced greenup date and prolonged growing season.Based on measured data from weather stations,increased temperature appears to be a critical factor contributing to earlier greenup and prolonged growing season;however,the relationship between precipitation fluctuations and phenological variation was unclear.
中文关键词	动态阈值 ; 藏北高原 ; 物候 ; 时空变化
英文关键词	MODIS dynamic threshold MODIS Northern Tibetan Plateau phenology spatio-temporal change
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:4265621
来源机构	中国科学院地理科学与资源研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/227377
作者单位	1.中国科学院地理科学与资源研究所, 资源与环境信息系统国家重点实验室, 北京 100101, 中国; 2.中国农业科学院农业环境与可持续发展研究所, 北京 100081, 中国
推荐引用方式 GB/T 7714	宋春桥,游松财,柯灵红,等. 藏北高原植被物候时空动态变化的遥感监测研究[J]. 中国科学院地理科学与资源研究所,2011,35(8):853-863.
APA	宋春桥,游松财,柯灵红,刘高焕,&钟新科.(2011).藏北高原植被物候时空动态变化的遥感监测研究.植物生态学报,35(8),853-863.
MLA	宋春桥,et al."藏北高原植被物候时空动态变化的遥感监测研究".植物生态学报 35.8(2011):853-863.