亚高山森林地表苔藓的氮、磷利用效率——以四川省黑水县为例

Nitrogen and phosphorus use efficiencies of understory mosses in a subalpine forest-A case study from Heishui County,Sichuan Province

苔藓是青藏高原东部亚高山森林的重要组成部分,在生态系统的净初级生产、养分循环和能量流动中发挥重要作用。本研究以亚高山冷杉林地表两种优势度最高的藓类为对象,通过标记并测量锦丝藓和塔藓的生长量和氮磷含量,初步探究了它们的氮磷利用效率。结果显示:锦丝藓的氮磷利用效率均略低于塔藓,但种间并无显著差异。锦丝藓和塔藓的氮利用效率分别为90.25 g g^(-1)和102.34 g g^(-1),磷利用效率分别为837.73 g g^(-1)和941.47 g g^(-1)。此外,两种苔藓表现出不同的养分利用策略,塔藓的氮磷生产力更高;而锦丝藓的氮磷滞留时间更长,具有较保守的养分利用策略。

Bryophytes are important components of subalpine forests in the eastern Tibetan Plateau,playing crucial roles in net primary production,nutrient cycling,and energy flow in the ecosystems.In this study,I focused on two dominant moss species on the forest floor of a subalpine fir forest and investigated their nitrogen and phosphorus use efficiencies by measuring their growth and nutrient content.The results showed that both Actinothuidium hookeri and Hylocomium splendens had similar nitrogen and phosphorus use efficiencies.The nitrogen use efficiency for A.hookeri was 90.25 g g^(-1),and the phosphorus use efficiency was 837.73 g g^(-1).For H.splendens,the nitrogen use efficiency was 102.34 g g^(-1),and the phosphorus use efficiency was 941.47 g g^(-1).The studied mosses presented different nutrient utilization strategies.Hylocomium splendens showed higher nitrogen and phosphorus productivity,while A.hookeri had a longer nitrogen and phosphorus residence time,indicating a more conservative nutrient utilization strategy.Overall,this study provides insights into the nitrogen and phosphorus use efficiencies of these dominant moss species in subalpine forests,contributing to our understanding of nutrient dynamics in these ecosystems.