摘要
砒砂岩区地形破碎,生态环境恶劣,降水量少且以暴雨为主,研究该区植被覆盖变化及环境驱动因子作用机制对区域植被建设具有重要的理论意义。基于1999—2018年的NDVI数据分析了砒砂岩区近20年植被覆盖度时空变化特征,利用了地理探测器方法量化分析了不同环境因子对植被覆盖度的影响。结果表明:1)近20年砒砂岩区平均植被覆盖度为42.3%,时间尺度上1999—2018年区域植被覆盖度呈增加趋势,平均上升幅度为0.086/10 a,空间尺度上植被覆盖度呈现从东南向西北递减的空间分布特征;2)近20年区域植被覆盖整体得到改善要比退化的区域面积大,45.5%的区域面积植被覆盖度极显著增加,主要分布在砒砂岩区东部区域,该区植被覆盖度未来变化趋势将以持续性改善为主,但仍有约41.6%的植被将由改善向退化方向变化;3)降水、土壤水分和气温是影响砒砂岩区植被覆盖空间分布的主导环境因子,且降水同其他环境因子的交互作用对植被覆盖影响最大。
The Pisha sandstone area is broken in topography, with little precipitation and mainly rainstorm, the ecological environment in the area is harsh. It is of great theoretical significance for regional vegetation construction to study the dynamic change of vegetation and explore the response characteristics of vegetation coverage to environmental factors. Based on the normalized difference vegetation index(NDVI) from 1999 to 2018, this study analyzed the spatio-temporal change characteristics of vegetation coverage in the Pisha sandstone area. In addition, the geodetector was used to analyze the influence of different environmental factors on the change of vegetation coverage, then we determined the most suitable range and type of each factor to promote vegetation growth. The results show that: 1) In the past 20 years, the average vegetation coverage in the Pisha sandstone area was 42.3%. On the time scale, the regional vegetation coverage had an increasing trend from 1999 to 2018, with an average increase of 0.086/10 a. On the spatial scale, the vegetation coverage presents a distribution characteristic of decreasing from southeast to northwest. The vegetation coverage of the three areas changes from large to small in order of soil-covered Pisha sandstone area, sand-covered Pisha sandstone area, and bare Pisha sandstone area. 2) In the past 20 years, the overall improvement of vegetation coverage in the Pisha sandstone area is greater than the degraded area. About 45.5% vegetation coverage of the regional area has increased obviously, mainly in the eastern part of the Pisha sandstone area whereas the significantly reduced areas were scattered in the middle of the bare area. The future trend of vegetation coverage in the Pisha sandstone area will be dominated by continuous improvement, accounting for 50.5% of the total area, mainly distributed in the southern soil-covered Pisha sandstone area. Although the vegetation in this area is showing an overall trend of improvement, it still faces greater challenges. About 4
作者
马晓妮
任宗萍
谢梦瑶
李占斌
李鹏
张星
MA Xiaoni;REN Zongping;XIE Mengyao;LI Zhanbin;LI Peng;ZHANG Xing(State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China,Xi′an University of Technology,Xi′an 710048,China;Key Laboratory of National Forestry Administration on Ecological Hydrology and Disaster Prevention in Arid Regions,Xi′an University of Technology,Xi′an 710048,China)
出处
《生态学报》
CAS
CSCD
北大核心
2022年第8期3389-3399,共11页
Acta Ecologica Sinica
基金
国家自然科学基金项目(42077074)
国家重点研发计划(2017YFC0504501)。
关键词
砒砂岩区
植被覆盖度
环境因子
地理探测器
Pisha sandstone area
vegetation coverage
environmental factors
geodetector
