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西藏森林是中国甚至是世界宝贵的绿色财富,具有丰富的动植物资源,对整个东南亚生态环境具有明显影响。为了有效保护和经营现有森林资源,足够的养分是维护森林生态系统健康与稳定的前提条件,凋落物养分含量高,在养分循环中具有重要的作用。2001年5月13日到8月19日在西藏色季拉山森林生态系统定位站急尖长苞冷杉(Abies georgei var smithii)原始林,6次采用标准地取样与实验室分析法,测定了冷杉地上、地下及林下倒木、枯立木养分含量及其变化,目的是揭示高山森林生态系统养分动态变化规律,为制定森林经营管理决策提供科学依据。研究表明:西藏色季拉山冷杉原始森林生态系统凋落物是养分循环的重要贮藏库,主要由地上凋落物、地下凋落物及倒木组成。不同月份、不同层次的地上凋落物分解速度有很大差异,其养分归还量、富集程度也有很大不同。与地上凋落物相比,地下凋落物中除Fe元素外,各元素的年归还量均较高,尤其是N、P、Mn元素。倒木养分元素总含量较少,以未腐倒木含量较高。
Tibet is a valuable green wealth of China and even the world. It has abundant animal and plant resources and has a significant impact on the ecological environment of Southeast Asia. In order to effectively protect and manage the existing forest resources, adequate nutrients are the preconditions for maintaining the health and stability of forest ecosystems. Litter has high nutrient content and plays an important role in the nutrient cycle. From May 13 to August 19, 2001, six sampling and laboratory analyzes of abies georgei var smithii (Abies georgei var smithii) native forest in Sejila Mountain Forest Ecosystem Positioning Station in Tibet were used to determine The purpose is to reveal the dynamic changes of nutrients in alpine forest ecosystem and to provide a scientific basis for making decisions on forest management. The results showed that the litter of fir forest ecosystem in Sejila Mountain in Tibet is an important reservoir for nutrient cycling, which is mainly composed of litter, underground litter and fallen wood. Different months, different levels of litter litter decomposition rate is very different, the return of their nutrients, the degree of enrichment is also very different. Compared with the litter on the ground, the annual litterfalls had higher annual return of all elements, especially N, P and Mn, except Fe. The total content of fallen wood elements less, not rotten wood content higher.