Abstract:
Objective Four 1-hectare plots of natural mixed spruce-fir coniferous and broadleaf forests located in Jin'gouling Forest Farm of Jilin Province were investigated to explore the spatial heterogeneity of standing crop and water content in semi-decomposition litter layer and forest canopy density under different cutting intensities21.21% of volume removed (heavy cutting), 11.22% (medium cutting), 6.29% (light cutting) and the control (no thinning).
Method An ordinary Kriging interpolation was performed on the data of the standing crop and water content in semi-decomposition litter layer and forest canopy density, and then their spatial distribution pattern was obtained using geostatistical methods.
Result At the scale of 10XC~.TIF100 m, cutting resulted in the standing crop of litter from a discrete distribution to aggregated distribution but with little effect on the spatial heterogeneity of water content. The canopy density of all plots showed an aggregated distribution and cutting affected the spatial heterogeneity of medium and heavy cutting plots to some extent. There was no correlation between the standing crop and canopy density. However, there was a significant negative correlation between the standing crop and water content in the control and the moderate cutting stands, but to a lesser degree (r < 0.3).
Conclusion Cutting has little effect on the spatial heterogeneity of water content in semi-decomposition litter layer. The heterogeneity of forest canopy density in the plots under medium cutting and heavy cutting may result from uneven cutting. Cutting reduces the degree of spatial heterogeneity in the standing crop of the semi-decomposition layer.
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