Krummholz island soil bulk density data for East of Tvan, 1994 and 1996.

Previous work has shown that bulk density is lower in the A horizon of soils directly under tree islands (Engelmann spruce (Picea engelmannii) and subalpine fir (Abies lasiocarpa)) than in adjacent tundra soil. We compiled a dataset of bulk densities from soils that had been previously collected at several dates in 1994 and 1996. The results from this large dataset confirmed those of Pauker and Seastedt (1996): soils within tree islands had lower bulk densities than those of other sites.既往研究表明，由恩氏云杉（Picea engelmannii）和亚高山冷杉（Abies lasiocarpa）构成的树岛下方土壤的A层（A horizon）土壤容重（bulk density），低于邻近的苔原土壤。我们整合了1994年与1996年多次野外采样获取的土壤容重数据集。本大型数据集的分析结果验证了Pauker与Seastedt（1996）的研究结论：树岛下方土壤的容重低于其他样点的土壤。