摘要
分析雅鲁藏布江山南宽谷流域NDVI对气候、地形的响应机制并识别出生态敏感区,为区域土地利用、生态保护提供科学参考。采用趋势分析法、相关性分析法、空间叠加法分析响应与敏感区。结果表明:(1)山南宽谷植被NDVI呈缓慢波动上升趋势,部分地区植被退化现象明显;(2)NDVI对气温和降水表现为负相关关系,且气温影响大于降水;(3)NDVI随高程变化先增加后减少,相对低高程和低坡度区域下降明显,坡向影响不显著;(4)生态敏感区主要分布在雅鲁藏布江河谷及两岸、乃东区及雅砻河附近、北部高山分布区。自然要素仍然是土地植被变化的不可忽略的因素,在生态敏感区应科学合理开发利用土地,适当控制人类活动干扰,减少生态压力。
The purpose of this study was to analyze how vegetation NDVI responded to climate and topography in the Shannan Broad Valley area of Yarlung Zangbo River,and recognize ecologically sensitive regions,so as to provide scientific advice for regional land use and ecosystem protection in the future. Trend analysis method,correlation analysis method and spatial superposition were employed in this paper to analyze response and sensitive areas. The results were shown as follows:(1) The annual average NDVI showed a slowly fluctuating upward trend;however,the vegetation coverage in some regions was degenerating obviously.(2) The negative correlation between air temperature and NDVI was stronger than that of precipitation.(3) The vegetation NDVI first increased and then decreased with the change of altitude,and descended significantly in the relatively low altitude and slope zone,but it had no direct relationship with terrain orientation.(4) The ecologically sensitive regions were distributed along both banks of Yarlung Zangbo River,Naidong District,Yalong river,and northern alpine regions. In conclusion,nature factors including temperature,precipitation and topography were still non-negligible factors of land use type vegetation NDVI change. Land resources should be utilized and developed properly,and disturbance from human activities should be controlled legitimately to reduce ecological pressure.
作者
李洪庆
张俊红
杨瑀
LI Hong-qing;ZHANG Jun-hong;YANG Yu(School of Public Administration,Hohai University,Nanjing 21l100,Jiangsu,China)
出处
《国土资源科技管理》
2022年第5期15-28,共14页
Scientific and Technological Management of Land and Resources
基金
国家自然科学基金(41801216)。
关键词
相关关系
生态敏感区
NDVI
气候变化
山南宽谷
co-relationship
ecologically sensitive regions
NDVI
climate change
Shannan Broad Valley
