PJB-2017-213
RESPONSE OF SPATIAL POINT PATTERN OF HALOSTACHYS CASPICA POPULATION TO GROUND WATER DEPTH
PANXIN NIU, MEI WANG, PING JIANG, MINGYAN LI AND GUANGMING CHU
Abstract
We subjected Halostachys caspica populations to three groundwater depths: shallow (< 2.5 m), middle (2.5–4.5 m), and deep (> 4.5 m) in the sample plots, at the diluvial fan of the South Junggar Basin. Both the spatial pattern and spatial association of the population among all three groundwater depths and four growth stages were studied to investigate the impact of groundwater depth on the formation and persistence mechanism of the spatial pattern of Halostachys caspica populations. In this study, Ripley’s K function was utilized to characterize spatial patterns and intraspecific associations of H. caspica in three 1-ha plots, as well as to study their relationship with groundwater depth. The seedling supplement severely decreased with increasing groundwater depth, and the population structure changed noticeably due to increased amount of dead standing plants. Different growth stagesof the H. caspica population all had aggregated distributions at small scale in the three groundwater depth areas. With increasing scales, the aggregation intensity weakened in all growth stages. Distribution was aggregated at 50 m scales in both the shallow and middle groundwater depth areas, while the deep groundwater depth area followed a random distribution.
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