西藏雅鲁藏布江流域植物物候变化及其海拔效应

doi:10.11934/j.issn.1673-4831.2017.12.006

生态与农村环境学报 ›› 2017, Vol. 33 ›› Issue (12): 1102-1108.doi: 10.11934/j.issn.1673-4831.2017.12.006

西藏雅鲁藏布江流域植物物候变化及其海拔效应

李海东¹, 陈斌^1,2, 叶尔纳尔·胡马尔汗², 曹学章¹

1. 环境保护部南京环境科学研究所, 江苏南京 210042;
2. 南京信息工程大学遥感学院, 江苏南京 210044

收稿日期:2017-06-12 出版日期:2017-12-25 发布日期:2017-12-19
作者简介:李海东(1984-),男,安徽毫州人,副研究员,博士,主要从事生态环境遥感研究。E-mail:Lihd2020@163.com
基金资助:
中央级公益性科研院所基本科研业务专项（GYZX170201）；西藏山南生态监测站2017年度监测任务项目；国家自然科学基金（41301611）

Changes in Vegetation Phenology and Its Elevation-Dependent Effects in the Yarlung Zangbo River Valley of Tibet, China

LI Hai-dong¹, CHEN Bin^1,2, YERNAER·Humaerhan², CAO Xue-zhang¹

1. Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection, Nanjing 210042, China;
2. School of Remote Sensing, Nanjing University of Information Science & Technology, Nanjing 210044, China

Received:2017-06-12 Online:2017-12-25 Published:2017-12-19

摘要/Abstract

摘要：

雅鲁藏布江流域位于青藏高原南部，海拔跨度较大，平均海拔4 600 m，是研究高海拔大流域气候变化生态响应的代表性区域。以雅鲁藏布江流域为例，综合运用1999-2013年的SPOT-VGT NDVI旬数据集和SRTM数字高程模型（DEM），利用阈值法提取物候特征，研究雅鲁藏布江流域植物物候变化及其海拔效应。结果表明，流域植物返青期提前的区域占流域总面积的61.3%，推迟的区域占38.7%；植物枯黄期提前的区域占45.3%，推迟的区域占54.7%。雅鲁藏布江流域植物生长季长度存在缩短现象，年变化率的像元平均值为-0.47 d·a^-1。自下游至上游，流域植物返青期逐渐推迟，枯黄期逐渐提前，植物生长季长度总体上呈缩短趋势。随着海拔的增加，雅鲁藏布江流域植物生长季长度和年变化率总体上呈减小趋势。

关键词: 植物物候, 海拔效应, 遥感技术, 高海拔地区, 青藏高原

Abstract:

The Yarlung Zangbo River Valley (YZR), stretching across the southern part of the Tibetan Plateau from west to east over a wide range of elevation from 147 m to over 7 000 m above sea level (a.s.l.) with an average elevation of 4 600 m, has been regarded as one of the ideal regions for the study on ecological response to climate change in alpine watershed. Based on the datasets of SPOT-VGT normalized difference vegetation index (NDVI) and SRTM digital elevation model (DEM), phonological features of the valley were extracted and elevation-dependent phenological change of the vegetation of the YZR during 1999-2013 was analyzed. The SPOT-VGT NDVI was first preprocessed with the non-symmetrical Gaussian function (AG) fitting method, and then the start date of growing season (SOG), the end date of the growing season (EOG) and the length of the growing season (LOG) of the vegetation was extracted, separately, through the threshold value method. Results show:(1) The SOG exhibited an advancing trend in 61.3% of the YZR, and a delaying trend in 38.8%, while the EOG did an advancing trend in 45.3% and a delaying trend in 54.7%. As a consequence, the LOG in the YZR was shortening, with the annual changing rate per pixel being -0.47 d·a^-1; (2) The SOG was gradually delaying, the EOG gradually advancing and the LOG gradually shortening along the river from the downstream up to the upstream. Besides, LOG and its annual changing rate is generally on a declining trend with rising elevation.

Key words: vegetation phenology, elevation-dependent effects, remote sensing technology, alpine regions, Tibetan Plateau

中图分类号:

李海东, 陈斌, 叶尔纳尔·胡马尔汗, 曹学章. 西藏雅鲁藏布江流域植物物候变化及其海拔效应[J]. 生态与农村环境学报, 2017, 33(12): 1102-1108.

LI Hai-dong, CHEN Bin, YERNAER·Humaerhan, CAO Xue-zhang. Changes in Vegetation Phenology and Its Elevation-Dependent Effects in the Yarlung Zangbo River Valley of Tibet, China[J]. Journal of Ecology and Rural Environment, 2017, 33(12): 1102-1108.

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西藏雅鲁藏布江流域植物物候变化及其海拔效应

Changes in Vegetation Phenology and Its Elevation-Dependent Effects in the Yarlung Zangbo River Valley of Tibet, China

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