| 摘要: |
| 三江源区位居我国重要的生态安全屏障区域，生态环境脆弱其生态系统功能与状况对源区及其下游水土资源及生态环境具有显著的影响。因此，基于NPP的植被生产力的估算及评价分析对区域水土生态环境治理，碳中和、碳达峰方案的制定与实施具有重要意义。本文基于MODIS 250m空间分辨率的归一化植被指数（NDVI）数据（MODIS13Q1），利用改进的CASA模型，估算并分析了三江源地区2000-2015年植被生产力（NPPP）空间分布格局、年际波动趋势、稳定性。结果表明：1）2000年以来，三江源植被NPP多年平均值267.83gC?m-2yr-1，呈西北向东南递增的趋势；2）三江源区植被生产力呈基本稳定或好转的态势，青藏高原气候的暖湿化，加之重大生态工程的实施促进了三江源区植被生态系统总体的好转。；3）2000-2015年，植被NPP变异系数以较低、低、中等等级为主，稳定性较高。 |
| 关键词: 三江源地区；植被生产力；时空格局；水土生态环境 |
| DOI： |
| 分类号:S19 |
| 基金项目: |
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| Spatiotemporal pattern and change characteristics of vegetation productivity in the Three River headwaters |
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cai xiaoqing
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Water Bureau of Pingan District, Haidong
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| Abstract: |
| The source region of the three rivers is fragile in ecological environment and an important ecological security barrier area in China. Its ecosystem function and status have a significant impact on the source region and its downstream ecological environment. Therefore, NPP based estimation and evaluation of vegetation productivity is of great significance. Based on MODIS 250m spatial resolution Normalized Vegetation Index (NDVI) data (MODIS12Q1), this paper estimates and analyzes the spatial distribution pattern, interannual fluctuation trend and stability of vegetation productivity (NPP) in the source region of the three rivers from 2000 to 2015 by using the improved CASA model. The results indicated that: 1) since 2000, the annual average NPP value of vegetation in the three river source area was 267.83 GC ? m-2yr-1, showing an increasing trend from northwest to Southeast; 2) the vegetation productivity in the three river source area was basically stable or improved, and the vegetation was generally improved; 3) from 2000 to 2015, |
| Key words: Three river headwaters；Vegetation productivity; Spatial and temporal pattern；Water and soil ecological environment |
