地球信息科学学报 ›› 2018, Vol. 20 ›› Issue (7): 967-977.doi: 10.12082/dqxxkx.2018.170597

• 地理空间分析综合应用 • 上一篇    下一篇

秦巴山区植被覆盖与土壤湿度时空变化特征及其相互关系

翟雅倩1,2(), 张翀1,*(), 周旗1, 常宵移3   

  1. 1. 宝鸡文理学院 陕西省灾害监测与机理模拟重点实验室,宝鸡 721013
    2. 中国地质大学(武汉)信息工程学院,武汉 430074
    3. 苍穹数码技术股份有限公司武汉分公司, 武汉 430073
  • 收稿日期:2017-12-11 修回日期:2018-03-08 出版日期:2018-07-20 发布日期:2018-07-13
  • 通讯作者: 张翀 E-mail:zhaiyaqian2009@163.com;zhangch3348@126.com
  • 作者简介:

    作者简介:翟雅倩(1993-),女,博士生,主要从事地理空间分析应用研究。E-mail: zhaiyaqian2009@163.com

  • 基金资助:
    陕西省社会科学基金项目(2016G013);宝鸡文理学院校级重点项目(ZK16064);陕西省自然科学基础研究计划项目(2018JQ4039)

Spatio-temporal Variation and Interrelationship of Vegetation Cover and Soil Moisture in Qinling-Daba Mountains

ZHAI Yaqian1,2(), ZHANG Chong1,*(), ZHOU Qi1, CHANG Xiaoyi3   

  1. 1. Shannxi Key Laboratory of Disaster Monitoring and Mechanism Simulation, Baoji University of Arts and Sciences, Baoji 721013, China
    2. Faculty of Information Engineering, China University of Geoscience, Wuhan 430074, China
    3. KQ GEO Technologies Company Limited, Wuhan 430073, China
  • Received:2017-12-11 Revised:2018-03-08 Online:2018-07-20 Published:2018-07-13
  • Contact: ZHANG Chong E-mail:zhaiyaqian2009@163.com;zhangch3348@126.com
  • Supported by:
    Shannxi Social Sciences Fund Project, No.2016G013;Key Project of Baoji University of Arts and Sciences, No.ZK16064;The Natural Science Basic Research Plan of Shaanxi Province under Grant, No.2018JQ4039

摘要:

基于2001-2014年MODIS-NDVI和MODIS-LST数据,利用温度植被干旱指数对土壤湿度进行遥感反演,分析了秦巴山区植被覆盖与土壤湿度时空变化特征及其相互关系。研究发现:① 秦巴山区植被覆盖与土壤湿度均呈增加趋势;② 植被覆盖整体水平较高且表现出“四周低,中间高”的空间分布特征,土壤湿度整体表现出“北低南高”的空间分布特征,大体上二者呈现出空间分布正相关性;③ 植被改善趋势表现明显,显著改善区分布分散,无明显集中区域,退化区域主要集中于北部渭河沿岸及东部边缘少量地区;土壤湿度增长态势明显,增大区分布于除西北边缘及东北边缘外的几乎整个研究区中,减小区域面积小且大部分表现不显著;④ 秦巴山区植被覆盖与土壤湿度时空变化上呈现出明显的正相关性,其中69.71%的区域表现出土壤湿度增大-植被覆盖改善的特征,分布于研究区除四周边缘地带外的大部分地区。

关键词: 秦巴山区, 植被覆盖, 土壤湿度, 时空变化, 相互关系

Abstract:

Qinling-Daba Mountains, as the geographical dividing line in central China, is the main water source area of the middle line project of transferring water from south to north, and also a sensitive area of the regional response to the global climate change. The spatio-temporal variation of vegetation, as a main component of terrestrial ecology system, represents the comprehensive response to climate change and human activities. Based on the MODIS data during 2001-2014, this study estimated the soil moisture using temperature vegetation dryness index, dynamically monitored the distribution characters and spatiotemporal variations of vegetation cover and soil moisture, analyzed its change trend, forecasted its future trend, and explored the interrelationship between vegetation cover and soil moisture in Qinling-Daba Mountains. The main conclusions are as follows: (1) Vegetation showed an increasing trend in Qinling-Daba Mountains during 2001-2014 years, as well as soil moisture, which respectively represented the best in 2010 and 2011, then both showed declining trends. (2) Vegetation distribution had a feature of “higher overall and lower in the middle”, while soil moisture with “lower in the north and higher in the south”, which showed a positive spatial correlation. (3) Vegetation had an obvious improving trend, and the significantly improved areas are dispersionally distributed, with no obvious concentration areas, and degraded areas were mainly concentrated in the north of Weihe River and a few areas along the eastern edge. Soil moisture increased significantly, and the increased areas distributed almost over the entire area except the northwest and northeast edge, and the reduced areas were small and not noticeable. The reverse variation of vegetation cover was stronger than continuous change, but soil moisture was just the opposite. In predicted future, in 44.36% of the study area, dispersed in entire area, the vegetation cover will undergo a process from increase to reduction, while soil moisture will continue to grow in 43.98% of the study area, including Qinling mountain in Shaanxi Province, Daba mountain in Sichuan province, and some parts of Jialing River basin and Han River. (4) The correlation between vegetation cover and soil moisture is positive. Nearly 69.71% of the study area showed an increasing tendency in both vegetation cover and soil moisture content, which was distributed in almost all parts of the study area except for the edges.

Key words: Qinling-Daba Mountains, vegetation cover, soil moisture, spatio-temporal variation, interrelationship