A new digital method of data collection for spatial point pattern analysis in grassland communities

文献类型： 外文期刊

第一作者： Wang, Xinting

作者： Wang, Xinting;Hou, Yali;Zhang, Weihua;Jiang, Chao;Jia, Chengzhen;Tai, Yang;Zhang, Weihua

作者机构：

关键词： digital photographs; geographical information system; point pattern; sampling technique; stress gradient hypothesis

期刊名称：ECOLOGY AND EVOLUTION （ 影响因子：2.912； 五年影响因子：3.271 ）

ISSN： 2045-7758

年卷期： 2020 年 10 卷 14 期

页码：

收录情况： SCI

摘要： A major objective of plant ecology research is to determine the underlying processes responsible for the observed spatial distribution patterns of plant species. Plants can be approximated as points in space for this purpose, and thus, spatial point pattern analysis has become increasingly popular in ecological research. The basic piece of data for point pattern analysis is a point location of an ecological object in some study region. Therefore, point pattern analysis can only be performed if data can be collected. However, due to the lack of a convenient sampling method, a few previous studies have used point pattern analysis to examine the spatial patterns of grassland species. This is unfortunate because being able to explore point patterns in grassland systems has widespread implications for population dynamics, community-level patterns, and ecological processes. In this study, we developed a new method to measure individual coordinates of species in grassland communities. This method records plant growing positions via digital picture samples that have been sub-blocked within a geographical information system (GIS). Here, we tested out the new method by measuring the individual coordinates ofStipa grandisin grazed and ungrazedS. grandiscommunities in a temperate steppe ecosystem in China. Furthermore, we analyzed the pattern ofS. grandisby using the pair correlation functiong(r) with both a homogeneous Poisson process and a heterogeneous Poisson process. Our results showed that individuals ofS. grandiswere overdispersed according to the homogeneous Poisson process at 0-0.16 m in the ungrazed community, while they were clustered at 0.19 m according to the homogeneous and heterogeneous Poisson processes in the grazed community. These results suggest that competitive interactions dominated the ungrazed community, while facilitative interactions dominated the grazed community. In sum, we successfully executed a new sampling method, using digital photography and a geographical information system, to collect experimental data on the spatial point patterns for the populations in this grassland community.

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