SHI Xiaoliang,WANG Xinshuang.Spatial and Temporal Variation of Vegetation Coverage and Its Response to Climate Change in the Loess Plateau[J].Research of Soil and Water Conservation,2018,25(04):189-194.
黄土高原草地覆盖度时空变化及其对气候变化的响应
- Title:
- Spatial and Temporal Variation of Vegetation Coverage and Its Response to Climate Change in the Loess Plateau
- Keywords:
- the Loess Plateau; grassland coverage; dimidiate pixel model; spatial and temporal variation; climate factors
- 分类号:
- TP79;P461+.7
- 摘要:
- 利用AVHRR GIMMS和MODIS两种NDVI数据源，基于像元二分模型对1982—2014年黄土高原草地覆盖度进行了模拟，并分析了时空变化特征及其与气候因子的关系。结果表明：黄土高原平均草地覆盖度为42.5%，1982—2014年总体呈增加趋势，且低覆盖度草地面积明显减少，而高覆盖度草地面积显著增加。黄土高原草地覆盖度空间分布差异显著，表现出东南高、西北低的特点。从草地覆盖度年际变化的空间分布来看，在退耕还草生态工程实施之前（1982—1998年），黄土高原大部分区域草地覆盖度无显著变化。自1999年后该区草地覆盖度增加趋势显著，增速达到1.76%，尤其是在陕北高原、山西中西部的吕梁—太行山等地，草地覆盖度增加趋势明显。通过退耕还草等生态工程的实施，该区植被状况得到改善。黄土高原草地覆盖度与降水气温相关性不明显，但空间差异明显，草地生长对降水因子的响应更为敏感。
- Abstract:
- Based on AVHRR GIMMS NDVI and MODIS NDVI data, spatial-temporal variations of the grassland coverage in the Loess Plateau from 1982 to 2014 were simulated using dimidiate pixel model, and the relationship between grassland coverage and climate factors was analyzed at grid scale. The results showed that average annual grassland coverage from 1982 to 2014 was 42.5% in the Loess Plateau, and the grassland coverage had increased over the past three decades. Besides, the area of low coverage grassland rapidly declined, and high coverage grassland developed fast. There was significant spatial difference of grassland coverage, and the grassland coverage of the southeast of the study area was higher than that of the northwest. Before the project of returning farmland to grassland (1982—1998), there was no significant change of grassland coverage in most regions of the study area. However, since the implementation of large-scale vegetation construction from 1999, the annual mean grassland coverage of the study area has increased significantly at a rate of 1.76%, especially in northern Shaanxi Plateau, Taihang-Lvliang Mountains, where significant increase in grassland coverage has been seen. The green for grain project has greatly improved the vegetation. As a whole, there was no significant correlation between grassland coverage and annual precipitation and temperature, but significant spatial difference was significant. The grass growths were sensitive to precipitation.
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备注/Memo
收稿日期:2017-09-07;改回日期:2017-09-25。
基金项目:国家自然科学基金（51409204）；西安科技大学科研培育资助项目（201605）
作者简介:史晓亮(1985-),男,陕西宝鸡人,讲师,主要从事资源环境遥感研究。E-mail:s_xiaoliang@126.com