高寒草甸氮素循环研究进展

A Review on Nitrogen Cycle in Alpine Meadow

高寒草甸氮素循环过程中的物理过程、化学过程和生物过程与土壤、植物的发生、发育紧密联系，因此对物理、化学、生物三个不同过程高寒草甸氮素循环的研究现状进行了分析。

Nitrogen, one of the important components of alpine meadow soils, is an ecological factor of alpine meadow ecosystem that greatly influences the productivities of alpine meadow ecosystems. Nitrogen cycle includes physical, chemical and biological process, which are closely linked to soil formation and plant growth. It＇s a considerable threaten for nitrogen leaching to water quality safety of ground water in alpine meadow, and may acidify the alpine soil. Alpine meadow acts as sink or source of nitrogen, which is controlled by such environmental factors as soil characteristics or water properties. Ammonia volatilization may cause the nitrogen loss of alpine meadow soil. Nitrogen mineralization, nitrification and denitrification are main chemical transformation processes that are the main mechanism of mineral nutrients supply and N2O emissions. The present paper aimed to provide a critical review on nitrogen cycle in alpine meadow ecosystems.