2001-2015年青藏高原草地碳源/汇时空变化及其与气候因子的关系  

Spatiotemporal Features of Carbon Source-Sink and Its Relationship with Climate Factors in Qinghai-Tibet Plateau Grassland Ecosystem During 2001-2015

作　　者：周夏飞[1] 於方[1] 曹国志[1] 杨威杉[1,2] 周颖 ZHOU Xiafei;YU Fang;CAO Guozhi;YANG Weishan;ZHOU Ying(Chinese Academy for Environmental Planning,Beijing 100012,China;Institute of Scientific and Technological Development,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]环境保护部环境规划院,北京100012 [2]中国科学院科技战略咨询研究院,北京100190

出　　处：《水土保持研究》2019年第1期76-81,共6页Research of Soil and Water Conservation

基　　金：国家重点研发计划重点专项(2016YFC0208800);国家自然科学基金(41371533);国家科技支撑计划课题(2015BAK12B02)

摘　　要：净生态系统生产力(NEP)是估算区域植被碳源/汇的重要指标。以青藏高原为研究区,基于光能利用率模型,利用遥感数据、气象数据和基础地理数据测算了2001—2015年草地生态系统净初级生产力(NPP),同时,应用土壤呼吸模型估算了逐月平均土壤呼吸量(Rs),进而估算青藏高原草地净生态系统生产力(NEP)。研究揭示了2001—2015年青藏高原草地生态系统NPP,NEP时空格局及其与气候因子的关系。结果表明:(1)2001—2015年,青藏高原草地生态系统整体表现为碳汇,平均净碳汇总量为1.82×1014 gC/a;(2)2001—2015年青藏高原草地生态系统NEP呈波动增加趋势,年平均值为120.8gC/(m2·a),年平均增长率为0.7gC/(m2·a);(3)研究区草地NPP与温度、降水相关性不显著,NEP与降水、温度均呈负相关。Net ecosystem productivity(NEP)is an important factor for the regional estimation of carbon sources and carbon sinks.We adopted remote sensing data,meteorological data and basic geographic data to estimate the net primary productivity(NPP)in Qinghai-Tibet Plateau grassland ecosystem in the period from 2001 to 2015 based on a light use efficiency model.We analyzed the spatiotemporal distribution of NEP in grassland ecosystem in Qinghai-Tibet Plateau based on the estimation of the NPP and soil respiration in the period from^2001 to 2015.We also analyzed the relationship between NPP/NEP and main meteorological factors.The results showed that:(1)grassland ecosystem in Qinghai-Tibet Plateau overall had the function of carbon sink during the period from 2001 to 2015,and the amount of average net carbon sequestration was 1.82×10 14 gC/a;(2)average NEP of grassland increased during the period from 2001 to 2015,with the average annual NEP of 120.8 gC/(m^2·a)and the growth rate of annual NEP of 0.7 gC/(m^2·a);(3)NPP of grassland had no significant correlation with precipitation and temperature;NEP of grassland was negatively correlated with precipitation and temperature.

关 键 词：青藏高原 草地 净生态系统生产力 净初级生产力 

分 类 号：S812.29[农业科学—草业科学]