2000～2013年三江平原北部NPP变化特征分析

应用最小二乘法和逐像元相关分析方法,结合三江平原土地利用变化数据,分析2000～2013年三江平原北部地区年均植被NPP变化情况,获得研究区NPP趋势变化数据及水田扩张与NPP空间相关数据.结果表明,三江平原北部在水田快速扩张驱动下,NPP值先缓慢减少后波动上升,整体为线性增加趋势.NPP具有明显年际增加趋势,基本规律为年均NPP值相对较低区域,增加趋势较弱,反之亦然.水田扩张与NPP值相关性分析表明,由旱地转为水田区域,水田扩张与NPP值变化具有正向相关性;由沼泽湿地和林地转为水田区域,水田扩张与NPP值变化具有负向相关性.研究表明,农田耕作方式是NPP变化重要影响因素之一.

Spatial-temporal variation characteristics of vegetation NPP of northern Sanjiang plain from 2000 to 2013

Using the least square method and pixel by pixel correlation analysis method,combined with the Sanjiang plain land use change data,this paper analysed the change of annual vegetation NPP in north of Sanjiang plain from 2000 to 2013,obtaining data about the change of NPP's trend,the paddy field expansion and the spatial correlation of NPP in the study area.The results showed that,being driven by rapid expansion of the paddy field in the northem area of Sanjiang plain,the value of NPP showed slow decline then rising volatility,and the overall trend of NPP showed a linear increase trend.The inter annual variation trend of NPP was obviously increasing,the basic rule for the annual NPP value of relatively low area,the increasing trend was weak,and vice verse.The expansion of paddy field and NPP value of the correlation analysis showed that from the dry land to paddy field area,expansion and change of paddy field NPP values have a positive correlation;the marsh and forest land tum into paddy field area,paddy field expansion and NPP had negative correlation.The study preliminary proved that ~e method of farming was one of the most important factors influencing the change of NPP.