2000-2010年贵州湿地植被净初级生产力时空变化研究

Study on Wetland Spatial and Temporal Patterns of Net Primary Productivity in the Duration of 2000-2010 in Guizhou

为了探明贵州省湿地净初级生产力(NPP)在2000-2010年的变化状况,以2000年、2005年和2010年湿地NPP数据为基础,运用ArcGIS和统计学的方法进行综合分析。结果表明:(1)11 a间贵州省湿地面积增加了134.1 km^2,人工湿地面积增加幅度明显;(2)湿地年均NPP值缓慢下降,2002年年均NPP值最大(764 g/(m^2·a)),2010年年均NPP值最小(647 g/(m^2·a));(3)湿地NPP空间分布规律呈自东向西南逐渐递减的趋势,低生产力湿地植被主要出现在湖泊湿地,且面积不断增加;(4)综合分析各市湿地NPP值得出,黔东南州NPP值最高(835 g/(m^2·a)),毕节地区(526 g/(m^2·a))和贵阳市(587 g/(m^2·a))较低;(5)2000-2010年间NPP变异面积呈增加趋势,NPP年均变异系数也逐年上升,说明湿地生态系统近10年间变化范围逐渐扩大。

Based on the data of wetland net primary productivity（NPP）,ArcGIS and statistical methods were used for comprehensive analysis to find out the changing situation of wetland NPP from 2000 to 2010 in Guizhou Province. Results showed that the area of wetland increased 134.1 km-2 during 11 years,and area of artificial wetland increased significantly.The wetland annual NPP value decreased slowly,with the maximum value 764 g/（m^2·a in 2002 and the minimum value647 g/（m^2·ain 2010. The spatial distribution of wetland NPP was gradually decreasing from east to south-west,and the low productivity area of wetland vegetation mainly appeared in the lake wetland which was increasing. Comprehensive analysis of the wetland NPP of cities indicated that the highest NPP value 835 g/（m^2·a appears in Qianxinan City,while lower NPP value 526 g/（m^2·aand 587 g/（m^2·aappears in Bijie City and Guiyang City respectively. During 2000-2010,NPP variation area appeared an increasing trend and annual NPP variation coefficient was rising year by year,which illuminated wetland ecological system change range was expanding in recent ten years.