摘要
根据西北地区139个气象观测站1980-2009年降水及温度资料,基于Z指数干旱指标,研究西北地区干旱时空特征;利用Miami模型估算该地区生态系统净初级生产力,分析干旱对净初级生产力的影响。结果表明:西北地区30年来,西部干旱有所降低,东部则出现加重趋势。生态系统净初级生产力年变化不规则,平均为524.5543g/(m2.a);空间特征明显,自东南向西北递减,新疆西北部又有所增加。该地区净初级生产力与Z指数线性相关极显著,随着干旱的发生,净初级生产力出现下降。出现轻旱及中旱的地区,净初级生产力较低;相对湿润的地区净初级生产力较高。
The characteristics of drought in northwestern China were analyzed by using Z- index, with precipitation and temperature data from 1980 to 2009 provided by the 139 meteorological stations there. The affection of drought on net primary productivity （NPP） was discussed with NPP determined by Miami model. It was found that the extent of drought in the northwest of this district was rising in recent 30 years, while in the southeast dropping. Changes in annual NPP were irregular, average in 524. 5543g/ （m^2 · a）. Spatial characteristics of NPP were significant, decreasing from southeast to northwest and growing when it came to northwest of Xingjiang. The correlation of NPP and Z - index in Northwest China was significant too. With drought forming, NPP was decreased. In some districts that in light and medium drought, NPP was lower than tha! in districts relatively humid.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2012年第6期1-7,共7页
Journal of Arid Land Resources and Environment
基金
中国气象局干旱气象科学研究基金(IAM201001)
中科院知识创新工程重大项目(KSCX-YW-09)
国家973项目(2006CB705809)
国家科技支撑计划(2006BAD26B0902)资助
关键词
干旱
净初级生产力
Z指数
drought
net primary productivity
Z - index
