| The Analysis on the characteristics of plant climatic productivity variations on Weigan River-Kuqa River delta oases |
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| DOI：10.7606/j.issn.1000-7601.2008.05.43 |
| Key Words: Weigan River-Kuqar River delta oasis natural vegetation climatic productivity annual variability |
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| Abstract: |
| 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. |
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