摘要:采用摄影定位法测定了宁夏荒漠草原3种不同土壤条件下猪毛蒿（Artemisia scoparia）幼苗种群的空间格局，并应用完全空间随机模型、泊松聚块模型和嵌套双聚块模型对其分布格局进行了分析。结果表明：（1）在灰钙土生境下，猪毛蒿幼苗种群在小尺度上（0-2.85m）表现为聚集分布，随着尺度的增大先呈现为随机分布（2.85-3.75 m），然后又呈现为均匀分布（3.75-5m）；在风沙土生境下，猪毛蒿幼苗种群在0-1.85 m之间表现为聚集分布，在1.85-2.35 m之间表现为随机分布，当尺度大于2.35 m时表现为均匀分布；而基岩风化残积土上的猪毛蒿幼苗种群在整个尺度上均呈现随机分布。（2）猪毛蒿种群幼苗在基岩风化残积土上符合泊松聚块模型，即猪毛蒿种群空间格局的聚块中不存在较高密度的小聚块；而在风沙土和灰钙土上则符合嵌套双聚块模型，即在大聚块中分布较高密度的小聚块。猪毛蒿幼苗种群空间格局的形成与土壤异质性存在着密切的联系，种群在空间中分布格局的形成机制可以通过种群空间格局的分析加以解释。



Abstract:The spatial pattern of an Artemisia scoparia seedling population under three different soil conditions in the Ningxia desert steppe was determined by a photography positioning method. Its distribution pattern was analysed by using a complete spatial random model, a Poisson block model and a nested bipartite block model. The results show that (1) in the calcareous soil, the population of A. scoparia seedlings occurred on a small scale (0-2.85 m) while A. scoparia seedlings in the calcareous soil and sandy soil showed an aggregated distribution, with the increase in the size of the first presenting a random distribution (2.85-3.75 m), and then presenting a uniform distribution (3.75-5 m).In the aeolian sandy soil, the A. scoparia seedling population showed an aggregated distribution between 0-1.85 m, a random distribution between 1.85-2.35 m, and a uniform distribution when the scale was larger than 2.35 m. However, the population of A. scoparia seedlings in the weathered residual soil of bedrock showed a random distribution on nearly the entire scale and, (2) the seedlings of A. scoparia fit a Poisson cluster on weathered residual soil of bedrock meaning that there were no high-density small aggregations in the aggregation of the spatial pattern of the A. scoparia population. However, the seedlings of A. scoparia in aeolian sandy soil and calcareous soil fit the nested double-cluster, meaning that the small clumps with higher density were distributed in the large clumps. The formation of the spatial pattern of A. scoparia seedlings is closely related to soil heterogeneity and the formation mechanism of the spatial distribution pattern of A. scoparia seedlings can be explained by the analysis of the spatial pattern of the population.





PDF全文下载地址:

https://www.ecologica.cn/stxb/article/pdf/stxb201804230924