摘要
为揭示黑河源区2000~2018年草地NPP的时空变化特点以及影响因素,基于MODIS数据,运用趋势分析法进行研究,以期为黑河源区草地生态系统碳储量的估算提供数据支撑。结果显示:黑河源区草地月平均NPP变化特征呈现“单峰型”曲线,年平均NPP整体呈现波动上升的特点。黑河源区草地年均NPP空间分布呈现自西北向东南逐渐增加的特点,表明海拔及水热组合条件是影响牧草生长的主导因素。黑河源区草地NPP随着高程的增加呈现先增加后降低的特点,在高程2757~3257 m时达到最大值,为262.38 gC/(m^2·a),且阴坡的NPP值高于阳坡的NPP值,表明阴坡草地的生产能力要强于阳坡草地的生产能力。
In order to reveal the temporal and spatial variation characteristics and influencing factors of grassland NPP in Heihe source area from 2000 to 2018,the paper based on MODIS data and used the method of trend analysis to provide data foundation for the estimation of carbon storage in grassland ecosystems of Heihe source area.The results showed that the average NPP showed a‘single-peak’curve monthly and an overall rise in fluctuation annually in grassland of Heihe source area.The spatial distribution of annual average NPP was gradually increasing from northwest to southeast in grassland of Heihe source area,which indicated that the elevation and hydrothermal combination conditions were the dominant factors affecting forage growth.With the increase of elevation,the NPP showed the characteristics of increasing first and then decreasing in the grassland of Heihe source area,and the NPP value of the shady slope was higher than sunny slope,which indicated that the productivity of grassland in shady slope was stronger than that of sunny slope.
作者
杨荣荣
曹广超
曹生奎
陈治荣
张卓
刁二龙
YANG Rong-rong;CAO Guang-chao;CAO Sheng-kui;CHEN Zhi-rong;ZHANG Zhuo;DIAOErlong(College of Geographical Science,Qinghai Normal University,Xining 810008,China;MOE Key Laboratory of Tibetan Plateau Land Surface Processes and Ecological Conservation,Xining 810008,China;Key Laboratory of Qinghai Province Physical Geography and Environmental Processes,Xining 810008,China)
出处
《草原与草坪》
CAS
CSCD
2020年第2期79-86,共8页
Grassland and Turf
基金
青海省自然科学基金项目(2018-ZJ-903)
青海省科技厅重大专项项目(2019-SF-A12)
国家重点研发计划项目(2017YFC0404304)
国家自然科学基金项目(41361005)资助。
关键词
黑河源区
草地NPP
时空变化
影响因素
Heihe source area
grassland NPP
temporal and spatial variation
influencing factors
作者简介
杨荣荣(1992-),女,陕西定边人,硕士研究生,E-mail:1370532120@qq.com;通讯作者:曹广超,E-mail:caoguangchao@126.com。
