摘要
干旱半干旱区主导着全球植被净初级生产力(net primary productivity,NPP)的年际变化(inter-annual variability,IAV),但该区域NPP-IAV及其驱动机制并不清楚。本文以河西走廊为研究区,使用CASA模型估算2002-2017年的NPP,基于距平通量公式计算了该地区NPP-IAV,并定量估算了时间、空间以及气候因子对NPP-IAV的贡献。结果表明:2002-2017年河西走廊NPP呈上升趋势,植被生长状况良好;NPP-IAV呈现先负后正的变化规律;河西走廊NPP-IAV受暖干和冷湿气候影响,前者控制的面积最大(51.01%),但对NPP-IAV的贡献仅占15.38%;后者对NPP-IAV的贡献率最大(48.68%),但面积仅占23.67%;暖干气候主导着河西走廊NPP的分布格局,冷湿气候主导着NPP年际变化;7月NPP对IAV贡献最大,3月最小;草地主导着河西走廊NPP-IAV;荒漠NPP总量最低,但贡献率却高于森林。据此预测,随着中国西北干旱区气候变暖,该地区植被NPP-IAV将进一步加剧。
Net primary productivity(NPP)in arid and semi-arid areas dominates the inter-annual variation(IAV)of global NPP.However,the NPP-IAV and its driving mechanisms in these areas remain unknown.Here,we estimated NPP in Hexi Corridor during 2002-2017 using the CASA model,calculated the change of NPP-IAV based on the formula of anomaly flux,and quantitatively estimated the contributions of spatial-temporal and climate factors to NPP-IAV.The results showed that NPP in Hexi Corridor increased from 2002 to 2017,and vegetation was growing well.During the study period,NPP-IAV showed a variation pattern from negative to positive.The NPP-IAV of Hexi Corridor was affected by warm-dry and cold-wet climate.The former climate condition controlled the largest area(51.01%)and contributed only 15.38%to NPP-IAV.In contrast,the cold-wet condition contributed the most to NPP-IAV(48.68%),though only accounted for 23.67%of the area.The warm-dry climate dominated the distribution pattern of NPP in the Hexi Corridor,with the cold-wet climate dominating the NPP-IAV.NPP in July contributed the most and that in March contributed the least to IAV.Grasslands dominated the NPP-IAV in the Hexi Corridor.The total NPP in desert was the lowest,but its contribution to NPP-IAV was more than that of forests.Therefore,it is predicted that the vegetation NPP-IAV will be further intensified with climate warming in the arid region of northwest China in the future.
作者
李传华
周敏
王玉涛
朱同斌
孙皓
殷欢欢
曹红娟
韩海燕
LI Chuan-hua;ZHOU Min;WANG Yu-tao;ZHU Tong-bin;SUN Hao;YIN Huan-huan;CAO Hong-juan;HAN Hai-yan(College of Geography and Environmental Science,Northwest Normal University,Lanzhou 730070,Gansu,China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2020年第10期3265-3275,共11页
Chinese Journal of Ecology
基金
国家自然科学基金项目(41761083和41861040)资助。
关键词
净初级生产力
年际变化
时空贡献
气候驱动
河西走廊
net primary productivity
inter-annual variation
spatial-temporal contribution
climate driving
Hexi Corridor
