以种群波动及谱分析理论为基础,分析古尔班通古特沙漠不同生境梭梭种群波动特征。结果表明: 梭梭种群的存活曲线基本接近于Deevey Ⅲ型,死亡率前期较高,后期相对较小,出现2~4次死亡高峰期。谱分析结果显示梭梭种群自然更新过程是通过不同径级的株数分布波动来表现的,种群波动不仅有大周期,而且呈现2个以上的小周期; 梭梭种群的基波主要受生物学特性和环境因素的影响,更多地受环境条件的左右,这与沙漠地区水分等非生物性因素制约有关。不同生境下的谱分析推绎显示,小尺度变化较大,大尺度变化逐渐趋于平稳,表明古尔班通古特沙漠在相对较好的环境条件下,梭梭种群的周期性波动可在较小的取样面积实现稳定(即样地面积为4 400~5 600 m2),在相对较差的环境条件下需要较大的取样面积才能实现稳定(即样地面积为4 400~9 200 m2)。因此,在进行谱分析时,应针对不同的环境条件确定取样面积,才能分析最佳尺度的周期性波动。
The population dynamic and quantitative characteristics of Haloxylon ammodendron in Gurbantunggut desert was analyzed based on a theory of population dynamics and spectral analysis. The results showed that the survival curve of H. ammodendron populations tended to be the type of Deevey-Ⅲ. The mortality rate of H. ammodendron was high at early stage and low at late stage. There existed 2-4 death peaks in the population life process. Spectral analysis showed the natural regeneration process of H . ammodendron population was expressed in fluctuation of the number distribution of trees in different age grades. The quantitative fluctuation of H . ammodendron population exhibited in large cycles within each which there were at least two small cycles. The influences of these cycles dropped with the diminishment of cycle length, and the effect of fundamental wave was more distinct. The fundamental wave was mainly affected by environmental factors, to a less degree by its biological characteristics. Upscaling process of spectrograph in different habitat showed that the small scale changed prominently, while the large scale was relative steady. Therefore, the sampling area of H. ammodendron population fluctuation in Gurbantunggut desert was 4 400-5 600 m2 in relative environmental condition, and 4 400-9 200 m2 in otherwise condition.
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