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凋落物分解过程中水溶性碳是高山森林溪流生态系统碳的重要来源,其在溪流中的流动转移不仅会影响下游水质环境,而且其含量动态受冬季季节性雪被形成及消融过程的深刻影响,但缺乏必要关注.因此,采用凋落叶分解袋法,以川西高山森林典型乔木(四川红杉Larix mastersiana、方枝柏Sabina saltuaria)和灌木(高山杜鹃Rhododendron lapponicum、康定柳Salix paraplesia)凋落叶为研究对象,根据凋落叶自然分解规律,研究冬季不同时期(冻结初期、冻结期、融化期)河流、溪流、河岸带以及林下凋落叶水溶性碳以及可溶性组分含量格局的动态变化特征.结果表明:在冬季的分解过程中,冻结初期河流与溪流中凋落叶水溶性碳与可溶性组分含量显著降低,而至冻结期与融化期含量均无明显变化.各时期,林下凋落叶水溶性碳和可溶性组分含量显著高于其他生境,表现为从河流、溪流、河岸带至林下逐渐增加的变化趋势.相关分析表明,高山森林凋落叶分解过程中水溶性碳和可溶性组分含量与平均温度、正积温、负积温以及流速均呈极显著负相关关系,同样也受到PO3-4和p H等水环境因子的影响.可见,高山森林凋落叶冬季水溶性碳和可溶性组分在分解过程中易随水体的流动而向下游生态系统输出,这为深入认识高山森林-流域水体间的生态联系提供了一定的科学依据.
During the litter decomposition, water-soluble carbon is an important source of carbon in the alpine forest stream ecosystem. The flow transfer in the stream will not only affect the downstream water quality and environment, but also its content is deeply affected by the formation of winter seasonal snow and the ablation process , But the lack of necessary attention.Therefore, using litter leaf decomposition bag method, the typical trees in the western Sichuan alpine forest (Larix mastersiana, Sabina saltuaria) and shrub (Rhododendron lapponicum, Salix paraplesia) According to the law of natural decomposition of litter, the dynamic characteristics of water-soluble carbon and soluble components in different stages of winter (freezing, freezing and thawing) were studied. Results The results showed that during winter decomposition, the contents of water-soluble carbon and soluble components of litter in rivers and streams decreased significantly in winter but no significant changes were found in freezing and thawing periods. The contents of carbon and soluble components were significantly higher than those of other habitats. The contents of carbon and soluble components were from rivers, streams and riparian zones The correlation analysis showed that the content of water-soluble carbon and soluble components in litter decomposition process of alpine forest had extremely significant negative correlation with average temperature, positive accumulated temperature, negative accumulated temperature and flow rate, and was also affected by PO3 -4 and p H etc .. It can be seen that the water-soluble carbon and soluble components in winter litter during the decomposition process of winter littoral are likely to be exported to the downstream ecosystems in the process of decomposition, which is of great significance for understanding the alpine forest-watershed The ecological connection between water provides a scientific basis.