Spatial association of natural regeneration of Picea crassifolia in Pailugou wa-tershed,Qilian Mountains
Picea crassifolia is a constructive species in the forest ecology of Qilian Mountains,the spatial association and agglomeration pattern of natural regeneration of P.crassifolia are of great significance for population regeneration.In August 2022,P.crassifolia plots in a stand at an altitude of 2800-3300m in the Pailuogou watershed of the Qilian Mountains were measured by measuring every tree size.P.crassifolia with diameter at breast height(DBH)less than 50mm were classified as new seedlings,and two biological indicators,DBH and plant height,were selected to explore the spatial association and cluster pattern through spatial autocorrelation analysis.The results show that:1)The DBH and plant height of young seedlings at different altitudes showed positive spatial autocorrelation,and the spatial correlation of DBH was 2800m＞3100m＞3000m＞2900m＞3300m.The spatial correlation of plant height was 2800m＞2900m＞3100m＞3000m＞3300m,and only at 3200m where it showed an insignificant negative autocorrelation between DBH and plant height,indicating that the spatial correlation between DBH and plant height of younger seedlings gradually decreased with the increase of altitude.2)The number of positive spatial autocorrelation was much more than negative spatial autocorrelation in DBH and height of different regenerated seedlings,indicating that the growth of individuals was beneficial to the growth of adjacent diameter classes.3)The DBH and plant height of the new seedlings were more concentrated in low-low agglomeration than in high-high agglomeration,and the boundary between them was obvious,indicating that the relationship between plants with adjacent diameter classes was more coordinated,and the exclusion effect between plants with large diameter classes was more obvious.4)The DBH and height of the new seedlings showed an alternate distribution of high-high agglomeration and low-low agglomeration,and the high-high agglomeration phenomenon gradually disappeared with the increases of altitude.
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