Earth hummocks are widely distributed in arctic, sub-Arctic and alpine regions and have important roles in determining plant diversity and the nutrient content of soils. We investigated the impact of the spatial heterogeneity on soil properties and plant communities caused by the hummocks on the Tibetan Plateau. The results indicated alpine hummocks created higher plant diversity and soil fertile island patterns under Kobresia Genus communities. Vegetation height, cover, above-ground and underground biomass, species richness and diversity at the top of well-developed hummocks were the significantly higher than those in the inter-hummocks and surrounding flat ground. The soil organic carbon content in surface soil layer (0-50 cm) at the hummock top was 154.6% and 172.3% higher than those in inter-hummock area and the flat ground, respectively. From the developing to well-developed stage, K. littledalei became the dominant population at hummock top instead of K. humilis, and fertile islands gradually formed with higher soil organic carbon and total nitrogen, lower soil moisture and wider soil temperature variation. RDA analysis further indicated the interactions of plant community succession and soil fertile island could create positive feedbacks to nutrient-rich patches.

土丘在北极，亚北极和高山地区广泛分布，在确定植物多样性和土壤养分方面具有重要作用。我们调查了空间异质性对青藏高原山岗造成的土壤特性和植物群落的影响。结果表明，高山嵩草在嵩草属下创造了更高的植物多样性和土壤肥沃的岛屿格局。社区。高度发达的草场顶部的植被高度，覆盖度，地上和地下生物量，物种丰富度和多样性均显着高于草场间和周围平坦地面的植被高度。沙丘顶部表土层（0-50 cm）的土壤有机碳含量分别比沙丘间区域和平坦地面高出154.6％和172.3％。从发育到发达阶段，小达勒幼虫（K. littledalei）逐渐成为山毛榉顶端的主要种群，而不是光合杆菌（K. humilis），逐渐形成了肥沃的岛屿，土壤有机碳和总氮含量较高，土壤水分较低，土壤温度变化较大。 RDA分析进一步表明，植物群落演替和土壤肥沃的岛屿之间的相互作用可以为营养丰富的斑块产生积极的反馈。