2001-2013年华北地区植被覆盖度与干旱条件的相关分析

doi:10.11821/dlxb201505004

地理学报 ›› 2015, Vol. 70 ›› Issue (5): 717-729.doi: 10.11821/dlxb201505004

2001-2013年华北地区植被覆盖度与干旱条件的相关分析

赵舒怡^1,^2,^3,⁴(), 宫兆宁^1,^2,^3,⁴(), 刘旭颖⁵

1. 首都师范大学资源环境与旅游学院,北京 100048
2. 水资源安全北京实验室,北京 100048
3. 三维信息获取与应用教育部重点实验室,北京 100048
4. 资源环境与地理信息系统北京市重点实验室,北京 100048
5. 中国科学院遥感与数字地球研究所,北京 100101

收稿日期:2015-01-14 修回日期:2015-04-01 出版日期:2015-05-20 发布日期:2015-05-20
作者简介:
作者简介：赵舒怡(1990-), 女, 湖北人, 在读硕士, 从事内陆湿地遥感方面的研究。E-mail: syzhao90@foxmail.com
基金资助:
国家国际科技合作专项资助(2014DFA21620);国家留学基金项目

Correlation analysis between vegetation coverage and climate drought conditions in North China during 2001-2013

ZHAO Shuyi^1,^2,^3,⁴(), GONG Zhaoning^1,^2,^3,⁴(), LIU Xuying⁵

1. College of Resource Environment & Tourism, Capital Normal University, Beijing 100048, China
2. Beijing Laboratory of Water Resources Security, Beijing 100048, China
3. Key Laboratory of 3D Information Acquisition and Application of Ministry, Beijing 100048, China
4. Beijing Municipal Key Lab of Resources Environment and GIS, Beijing 100048, China
5. Institute of Remote Sensing and Digital Earth, CAS, Beijing 100101, China

Received:2015-01-14 Revised:2015-04-01 Published:2015-05-20 Online:2015-05-20
Supported by:
International Science & Technology Cooperation Program of China, No.2014DFA21620;China Scholarship Foundation

摘要/Abstract

摘要：

基于MODIS-NDVI遥感数据以及地表气象数据,计算了2001-2013年华北地区的修正Palmer干旱指数（Palmer Drought Severity Index,PDSI）和植被覆盖度,总结出植被覆盖度以及PDSI的年际变化规律,从华北地区生态分区的角度分析了二者的相关关系。结果表明：① 华北平原的植被覆盖度呈南高北低、中部高四周低的分布特点,最低为内蒙古高原草原生态区的0.61,最高为淮阳丘陵地区的0.84;② 2001-2013年,华北平原整体植被覆盖度主要呈上升趋势,其中华北的北部、西部、南部山区及丘陵地带植被覆盖度主要呈上升趋势,而华北平原农业区以及京津唐城郊地带植被覆盖度呈下降趋势;③ 华北地区的东北部有变潮湿的趋势,南部则有变干旱的趋势,其他地区干旱条件变化不明显;④ 华北地区植被覆盖度与气候干旱程度的平均相关系数为0.20,73.37%的地区相关系数为正,正相关关系最为明显的地区为华北地区的西北部,而北京、天津、以及河北省与河南省一级、二级城市的城郊地区相关系数多为负值。⑤ 在华北大部分地区,夏季和秋季的气候干旱条件对植被覆盖度的影响最为明显。

关键词: 华北地区, 植被覆盖度, PDSI, 生态区, 相关分析

Abstract:

Based on previous studies, the climate drought index can be used to assess the evolution trend of ecological environment under various arid climatic conditions. It is necessary for us to further explore the relationship between vegetation coverage (index) and climate drought conditions. Therefore, in this study, based on MODIS-NDVI products and meteorological observation data, the Palmer Drought Severity Index (PDSI) and vegetation coverage in North China were first calculated. Then the interannual variation of PDSI and vegetation coverage over 2001-2013 was analyzed by using a Theil-Sen slope estimator. Finally in an ecoregion perspective the correlation between them was discussed. The experimental results demonstrated that PDSI index and vegetation coverage value varied over different ecoregions. During the period 2001-2013, vegetation coverage increased in southern and northern mountains in North China, while it showed a decreasing trend in Beijing-Tianjin-Tangshan City Circle area and suburban agricultural zone. During the 13 years, the climate of the northeastern part of North China became more humid, while in the southern part of North China, it tended to be dry. According to the correlation analysis results, 73.37% of North China had a positive correlation between the vegetation coverage and climate drought index. A negative correlation was observed mainly in urban and periurban areas of Beijing, Tianjin, Hebei Province and Henan Province. In most parts of North China, drought conditions in summer and autumn had more influence on vegetation coverage.

Key words: North China, vegetation coverage, PDSI, ecoregion, correlation analysis

赵舒怡, 宫兆宁, 刘旭颖. 2001-2013年华北地区植被覆盖度与干旱条件的相关分析[J]. 地理学报, 2015, 70(5): 717-729.

ZHAO Shuyi, GONG Zhaoning, LIU Xuying. Correlation analysis between vegetation coverage and climate drought conditions in North China during 2001-2013[J]. Acta Geographica Sinica, 2015, 70(5): 717-729.

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干旱指数值	等级	干旱指数值	等级
≥ 4.00	极端湿润	-1.99~-1.00	轻微干旱
3.00~3.99	严重湿润	-2.99~-2.00	中等
2.00~2.99	中等湿润	-3.99~-3.00	严重干旱
1.00~1.99	轻微湿润	≤-4.00	极端干旱
-0.99~0.99	正常

2001-2013年华北地区植被覆盖度与干旱条件的相关分析

Correlation analysis between vegetation coverage and climate drought conditions in North China during 2001-2013

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