河北省2005-2014年植被NPP时空演变及其与气候因子的关系

在GIS软件的支持下，利用2005—2014年MOD17A3H与MCD12Q1数据集，结合河北省2005—2012年的142个气象站点资料，利用一元线性回归法分析了河北省10年间NPP的时空演变特征，利用相关系数法分析了NPP与气候因子的相关关系。结果表明:河北省年NPP主要集中在200～400 g/（m²·a），其中NPP高值区分布在燕山北部区域和太行山东侧一带。2005—2014年河北省年NPP均值与最大值均在波动中微弱上升，年NPP均值在2012年最大为337.63 g/（m²·a）。2005—2014年NPP增长率大于10%的地区分布在冀西北区域和东南边界，其面积占比为43.03%。河北省5种植被覆盖类型按NPP年均值从大到小排列依次为:阔叶林、灌丛、草地、针叶林、农用地。河北省NPP与气温主要呈负相关，与降水主要呈正相关。

Spatiotemporal Distribution of Vegetation Net Primary Productivity and Its Relationship with Climate Factors in Hebei Province from 2005 to 2014

Based on MOD17A3H and MCD12Q1 products of MODIS and meteorological data, spatiotemporal changes of net primary productivity (NPP) in Hebei Province during 2005—2014 were quantitatively analyzed by the method of linear regression. The correlations between NPP and climate factors were analyzed by using the method of correlation coefficient. The results showed that the annual NPP value in Hebei Province mostly ranged from 200 g/(m²·a) to 400 g/(m²·a), among which the high NPP values distributed in the north of Yanshan Mountain and the east of Taihangshan Mountain. The annual average NPP and maximum NPP value in Hebei Province from 2005 to 2014 presented the same fluctuation change and slightly upward trend. The annual average NPP peaked at 337.63 g/(m²·a) in 2012. The areas with the growth rate more than 10% occupied 43.03% of the area of Hebei Province, and mainly distributed in the northwest and southeast of the Hebei Province. The annual average NPP of the five vegetation cover types decreased in the order: broadleaf forest > shrublands > grasslands > needleleaf forest > croplands during 2005—2014. Correlation between NPP and air temperature was mainly negative，while the correlation between NPP and precipitation was mainly positive.