Spatio-temporal analysis about the primary productivity of Mentougou District in Beijing from 2003 to 2014
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摘要: 采用CASA模型和30m分辨率Landsat数据生成了门头沟区2003-2014年的植被净初级生产力（NPP）产品，分析了门头沟区NPP的空间分异特征，基于MODIS年NPP产品分析了门头沟区2003-2014年NPP的年际变化特征，基于MODIS植被总初级生产力（GPP）时间序列数据分析了门头沟区典型年份的年内GPP变化特征.结果表明：2003-2014年门头沟区NPP受地形及人为因素影响，低值区主要沿河流谷地及东部河流出山口处分布，在整体区域上呈现四周高、中间低的特征；自2005年以来年际NPP总体平稳，没有明显的增加或减少趋势；GPP年内波动明显，5-9月GPP/NPP的差异对不同年份间GPP/NPP差异的贡献最大.Abstract: Ten years NPP products of Mentougou District from 2003 to 2014 are generated using CASA model and Landsat remote sensing data. It is used to show the spatial distribution characteristic about Mentougou District' NPP. Inter-annual variability characteristic about Mentougou District' annual amount NPP is analyzed using MODIS17A3 products from 2003 to 2014. The intra-annual variability characteristic about Mentougou District' GPP was analyzed based on MODIS17A2 product in some typical years (namely 2004, 2007, 2008, 2009, 2011, 2012). The results show that the NPP of Mentougou District has a significant spatial differentiation characteristic that the value of NPP is low on median and it is high on other region. The NPP value is very low distributed along the river valleys. The annual amount NPP has no significant increasing or decreasing trend from 2005. GPP fluctuated significantly during the year. The differences in GPP/NPP between May and September contributed the most to the differences in GPP/NPP among different years.
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Key words:
- NPP /
- CASA model /
- landsat /
- MODIS /
- EVI
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图 1 门头沟区Landsat NPP空间分布(单位gC $\cdot$ m-2·d-1)
Fig. 1 Spatial distribution of Landsat NPP in Mentougou region (unit gC $\cdot$ m-2·d-1)
图 2 2003—2014年门头沟区年NPP变化趋势(MODIS17A3产品)
Fig. 2 Variation trend of NPP in Mentougou region from 2003 to 2014(MODIS17A3 production)
表 1 选用Landsat数据的获取日期以及传感器类型
Tab. 1 The date and the sensor type of Landsat data
序号 影像获取日期 传感器类型 序号 影像获取日期 传感器类型 1 2003-05-24 TM 6 2008-09-10 TM 2 2004-06-11 TM 7 2009-08-12 TM 3 2005-06-30 TM 8 2010-08-15 TM 4 2006-06-17 TM 9 2013-08-23 OLI 5 2007-09-24 TM 10 2014-08-26 OLI 
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