摘要
植被净初级生产力NPP是陆地植被碳储备、碳循环的指示因子,文中提出基于MODIS的NPP数据产品,结合实地植被生物量转换为植被净初级生产力实测数据,构建适用于浑善达克沙地的NPP遥感光学模型,研究2006-2018年3-11月间NPP的时空分布特性,分析不同植被类型NPP值,及研究区气候响应对NPP的变化影响,得出以下结论:1) NPP分布特征呈现东高西低的分布特点,变化范围为200.1-225.0g C/m^2/yr,多年平均NPP为213.3g C/m^2/yr,基本呈现增长趋势但近年略有所下降,但增长趋势并不显著(p=0.10)。2) 2006-2018年期间浑善达克沙地各类植被类型的单位面积NPP有逐年增加趋势,NPP贡献率主要受草原地带的沙地植被和丛生禾草、根茎禾草典型草原影像较大约为30-39%。3) 15年间NPP增长的变化趋势受气候因素降水影响更为突出。
Vegetation net primary productivity(NPP) is an indicator of carbon storage and carbon cycle in terrestrial vegetation. Based on MODIS and the measured data, vegetation biomasses were conversed into NPP, the NPP remote sensing optical model suitable for Hunshandake sandy land was constructed to analyze the spatial and temporal distribution characteristics of vegetation net primary productivity(NPP), and the effect of climate changes on NPP from 2006 to 2018. The conclusions are as follows: 1) The annual NPP was higher in the eastern region than in the western region;the average annual NPP was 213.3 g C/m^2/yr, and the maximum value of total NPP was increasing year by year from 200.1-225.0 g C/m^2/yr in 2006 to 2018, in spite the NPP growth trend decreased slightly in recent years. The growth trend was not significant(p=0.10). 2) The NPP of various vegetation types in Hunshandake sandy land were increasing year by year from 2006 to 2018, and were mainly affected by the sandy land vegetation, herbaceous grasses and rhizomatous grasses, they contributed to 30-39% of the increase. 3) The climate factors of precipitation was more prominent contribution to the change trend of NPP in the past 15 years.
作者
安妮
宁小莉
海全胜
丁蕾
AN Ni;NING Xiaoli;HAI Quansheng;DING Lei(Baotou Teachers’Collage,Baotou 014030,China;Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences,Beijing 100081,China)
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2020年第4期168-175,共8页
Journal of Arid Land Resources and Environment
基金
内蒙古科技计划项目(201605052)资助。
