刈割高度对高寒沼泽湿地植被再生影响的研究

EFFECTS OF MOWING HEIGHT ON VEGETATION REGROWTH IN ALPINE MIRE WETLAND

湿地是水域和陆地系统交互接壤地带中天然或人工形成的长久或暂时性的沼泽、泥炭等带有静止或流动水体的成片浅水区，对调节气候、涵养水源、蓄洪防旱、保护生物多样性、调节生态平衡等方面发挥着重要作用。因祁连高寒沼泽湿地地处内陆腹地、青藏高原北部边缘，远离海洋且受高山阻隔，降水稀少。气候干燥。山地周围被干旱荒漠、半荒漠、沙漠、盐碱荒地等包围，自然干扰强烈，是一个基础相当脆弱的生态环境。加之近年人类对湿地资源的破坏性攫取，祁连山高寒沼泽湿地生态系统平衡遭到破坏。高寒沼泽湿地植被的再生性对湿地保护和恢复建设及其重要。因此，本文通过控制试验研究最适留茬高度对高寒沼泽湿地植被再生长的影响。研究结果显示：刈割中1～2cm的留茬高度对植被的地上生物量和盖度具有显著的积极作用。即1～2cm的留茬高度有益于植被的再生长，可以在湿地植被的可持续利用中作为参考。

Wetland is a kind of long-term or temporary marsh, peat and other shallow water areas with stationa- ry or flowing water bodies in natural and artificial borders of water and land system. Biodiversity, ecological hal- ance and other aspects play an important role. Because of the terland, the northern edge of the Qinghai Qilian alpine swamp wetland is located in the bin- -Tibet Plateau, away from the ocean and by the mountain barrier, precipitation scarce, dry climate. Surrounded by arid desert, semi-desert, desert, saline-alkali wasteland sur- rounded by natural interference strong, is a very fragile ecological environment. In addition, the destructive grab of wetland resources in recent years, the Qilian Mountains alpine swamp wetland ecosystem balance has been destroyed. Regeneration of alpine swamp wetland vegetation and its importance to wetland protection and restoration. Therefore, the effect of optimum stubble height on the re-growth of alpine swamp wetland was stud- ied by controlling the experiment. The results showed that the stubble height of 1 - 2 cm had significant positive effects on the aboveground biomass and cover of the vegetation, that is, 1 - 2 cm of stubble height was beneficial to vegetation re-growth, and could be used in wetland vegetation as a reference.