阿拉善高原珍珠猪毛菜(Salsola passerina)种群空间分布格局

为探究阿拉善高原珍珠猪毛菜(Salsola passerina)种群生长习性和空间格局分布机制,采用体积划分龄级方法和Ripley’s K函数对具有代表性的珍珠猪毛菜种群年龄结构、空间分布格局及不同龄级间的空间关联性进行研究。结果表明:珍珠猪毛菜种群结构以稳定型为主,其次是增长型,成年个体占比高,种群整体趋于稳定。随干旱程度增加,珍珠猪毛菜种群及各龄级空间分布格局由复杂向单一转变,即由聚集分布或均匀分布向随机分布转变。在降水较多的种群内,各龄级间的空间关联性相对复杂,随尺度增大由正关联转变为无关联,再转变为负关联。在较干旱地区,整体上表现为无关联。在阿拉善高原,珍珠猪毛菜种群空间分布特性由其本身生物学特性与环境因素共同作用,在生态建设中应遵循种群与生境间相互关系,发挥其饲用及防风固沙价值。

Spatial distribution pattern of Salsola passerina population in Alashan Plateau

In order to reveal the growth habits and spatial pattern distribution mechanism of Salsola passerina population in the Alashan Plateau,Method of dividing age class by volume and Ripley's K function were used to study the population structure,spatial distribution pattern and spatial correlation of representative S.passerina population.The results showed that the population of S.passerina was dominated by stable population,followed by expanding population.There are many adult individuals,and the overall population tends to be stable;As the degree of drought increases,the spatial distribution pattern of S.passerina population and age class changes from complex to single form,that is,from aggregation distribution or uniform distribution to random distribution.In populations with more precipitation,the spatial correlations between age classes are relatively complex.with the increase of scale,it changes from positive association to no correlation,and then to negative correlation.In the more arid regions,there is generally no correlation.In summary,In the Alashan Plateau,the spatial distribution of the S.passerina population is influenced by its biological characteristics and environmental factors.In the ecological construction,the mutual relationship between populations and habitats should be followed to give play to its value for feed and sand fixation.