摘要
收集位于渭干河—库车河三角洲绿洲区的库车气象站和沙雅气象站1961-2000年的气温和降水实测资料,应用Tharnthwaite Memorial模型计算渭干河—库车河三角洲绿洲区近40 a来自然植被净第一性气候生产力,并以回归分析和趋势线分析方法分析了其年际变化特征。结果表明：①近40 a来渭干河—库车河三角洲绿洲区自然植被净第一性气候生产力呈现出明显的增长趋势,其变化倾向率为28.21 g/（m^2·10a）,在40 a中增加约为112.84 g/m^2,近40 a来研究区自然植被净第一性气候生产力的变化趋势为自北向南显著增加。②由于研究区水热条件的不同,自然植被净第一性气候生产力有明显的区域差异,整个研究区近40 a的自然植被净第一性气候生产力平均值为123.35 g/（m^2·a）,北部库车县137.10 g/（m^2·a）,南部沙雅县110.16 g/（m^2·a）,即自然植被净第一性气候生产力的空间分布是北高南低。③研究区自然植被净第一性气候生产力与年降水量的相关性优于自然植被净第一性气候生产力与年均气温之间的相关性,因为渭干河—库车河三角洲绿洲是个干旱区绿洲,气候干燥,水资源短缺,降水是自然植被净第一性气候生产力的主要限制因子。
Based on the measured data of temperature and precipitation at Kuqa and Shayar meteorological stations from 1961～2000,it calculated the four-decade natural vegetation net primary climatic productivity of Weigan River-Kuqa River delta oasis used the Tharnthwaite Memorial Model,and analyzed its annual variability by the methods of regression and trend line analysis.The results show that ① there was an obvious increase in natural vegetation net primary climatic productivity of Weigan River-Kuqa River delta oasis between 1961 and 2000 by a changing rate of 28.21 g/（m^2·10a）.The changing rate rose by 112.84 g/m^2 in this time period,and it showed an increase trend from north to south in this region;② There are clear regional differences of natural vegetation net primary climatic productivity in this delta oasis because of the varied hydrothermal conditions.The average value of natural vegetation net primary climatic productivity during the four decades in this region is 123.35 g/（m^2·a）,but Kuqa County on the north and Shayar County on the south have a value of 137.10 g/（m^2·a） an 110.16 g/（m^2·a） respectively.③ The correlation between natural vegetation net primary climatic productivity and precipitation is superior to that between natural vegetation net primary climatic productivity and the average annual temperature due to the main restricting factors such as dry climate,water shortage and limited precipitation.
出处
《干旱地区农业研究》
CSCD
北大核心
2008年第5期212-216,共5页
Agricultural Research in the Arid Areas
基金
国家自然科学基金资助项目(40661015)
关键词
渭干河—库车河三角洲绿洲
自然植被
气候生产力
年际变化
Weigan River-Kuqar River delta oasis
natural vegetation
climatic productivity
annual variability
