欢迎访问《中国农学通报》,

中国农学通报 ›› 2017, Vol. 33 ›› Issue (26): 70-77.doi: 10.11924/j.issn.1000-6850.casb17060017

• 资源 环境 生态 土壤 气象 • 上一篇    下一篇

基于MODIS EVI的陇南山地植被覆盖时空变化特征研究

张波,牟建新,徐璐,马兴刚   

  1. 甘肃省陇南市气象局,西北师范大学,甘肃省陇南市气象局,西北师范大学
  • 收稿日期:2017-06-03 修回日期:2017-08-10 接受日期:2017-08-10 出版日期:2017-09-19 发布日期:2017-09-19
  • 通讯作者: 张波
  • 基金资助:
    甘肃省气象局项目“陇南山区特色农业气象灾害风险区划与气候区划研究”(2013-20)。

Spatial and Temporal Variation of Vegetation Coverage in Mountain Area of Longnan: Based on MODIS EVI

牟建新,徐璐 and 马兴刚   

  • Received:2017-06-03 Revised:2017-08-10 Accepted:2017-08-10 Online:2017-09-19 Published:2017-09-19

摘要: 为了分析2000以来的退耕还林还草工程对高植被覆盖区甘肃省陇南市的影响,本研究基于2000—2010年MODIS EVI数据,通过均值分析、植被覆盖度分析和线性回归分析,对陇南山地连续11年以来的植被覆盖时空变化特征进行研究。结果表明:2000—2010年陇南山地植被覆盖变化总体以0.2%/10 a的增速缓慢上升,低于同期甘肃河东地区、甘肃全省、秦巴山区以及西北地区的植被增长率。受气温、降水等地带性要素分布的影响,其内部存在明显的区域差异性,植被覆盖大体上存在由东南向西北递减的趋势。整个山区植被类型以覆盖度在45%以上的中覆盖、中高覆盖及高覆盖植被为主体,林地所占比例较大。尽管研究时段内植被改善区域显著增加,但高植被覆盖区却存在退化趋势,考虑到陇南市相对脆弱的生态环境,加强植被保护仍将是今后生态建设中不容忽视的内容。

关键词: 水稻, 水稻, 基蘖穗肥配比, 氮素吸收, 氮肥利用

Abstract: The paper aims to analyze the influence of the strategy of returning the grain plots to forestry and grass since 2000 to Longnan City of Gansu Province,a high coverage area.Based on the MODIS EVI data during the period from 2000 to 2010, the spatial and temporal variation of vegetation coverage in the Mountain Area of Longnan was studied by using the EVI average analysis, method of vegetation coverage and linear regression trend analysis. The results showed that: The change of vegetation cover the Mountain Area of Longnan increased slowly with the increase of 0.2%/10 From 2000 to 2010, which was lower than that of He-dong region of Gansu Province, Gansu Province, Qinba mountain area and northwest China. Influenced by the distribution of regional elements such as temperature and precipitation, there was a obvious regional difference in vegetation coverage, which had a trend of decreasing from southeast to northwest. The vegetation types in the whole mountain area with vegetation coverage above 45% accounts for the majority part, which were the type of middle and high coverage, and high coverage vegetation., the proportion of forest land is larger than others in Gansu Province. [Conclusion]Although the area of vegetation improvement is larger than that of the degraded area, However, there was a trend of degradation in high vegetation coverage area, Considering the relatively fragile ecological environment, its not be ignored for the Mountain Area of Longnan to strengthen vegetation protection in the future ecological construction.