By taking the main forest type of the stands in Manhan Mountain of Inner Mongolia as the research object, the main forest's ecological functions, including water-holding, soil conservation, carbon fixation were quantitatively evaluated and calculated. The estimated results are as follows (1) about water-holding: the amount of water-holding of Pinus plantation was 617 963.2 m3; the amount of water-holding of north China Larix gmelinii was 467 782.5 m3; the amount of water-holding of natural white Birch was 5 562 380 m3. (2) about soil conservation: the solid conservation of Pirns plantation was -175.8291 · a-1, the amount of fertilizer was GD = -15.559 11 · a-1, Gp = - 8.265 71 · a-1, Gk = -183.118 91 · a-1; the solid conservation of north China Larix gmelinii solid conversation was 18.192 11 · a-1, the amount of fertilizer is G n = 3.2387t · a-1, Gp = 0.805 21 · a-1, Gk = 2.05221 · a-1; The solid conservation of natural white Birch is 109.666 91 · a-1, the amount of fertilizer is Gn = 9.250 41 · a-1, Gp = 4.977 81 · a-1, Gd = 108.534 t·a-1. (3) about carbon fixation and oxygen release: the amount of oxygen release of Pirns plantation was 8 381.71, the carbon fixation was 11 384.1 t; the amount of oxygen release of north China Larix gmelinii was 15 379.271, the oxygen release was 20 886.714; the amount of oxygen release of natural white birch was 83 685.51, and the carbon fixation was 113 672.81.%以内蒙古蛮汉山林区的主要林分类型为研究对象,对主要林型的涵养水源、保育土壤和固碳释氧效益等主要森林生态功能进行定量的评估计算.估算结果:(1)涵养水源方面:油松Pinus tabulaeformis人工林的水源涵养量为617 963.2 m3;华北落叶松Larix principis-rupprechtii人工林的水源涵养量为467 782.5 m3;白桦Betula platyphylla天然林的水源涵养量为5 562 380 m3; (2)保育土壤方面:油松人工林的固土量为-175.829 t·a-1,保肥量为G氮=-15.5591 t·a-1、G磷=-8.265 7 t·a-1、G钾=-183.1189 t·a-1;华北落叶松人工林的固土量为18.1921 t·a-1,保肥量为G氮=3.2387t·a-1、G 磷=0.805 2 t·a-1、G钾=2.052 2 t·a-1;白桦天然林的固土量为109.666 9 t·a-1,保肥量为G氮=9.2504 t·a-1、G磷=4.9778t·a-1、G钾=108.534 t·a-1；(3)固碳释氧方面:油松人工林的释氧量为8 381.7 t,固碳量为11 384.1 t；华北落叶松人工林释氧量为15 379.27 t,固碳量为20 886.714 t；白桦天然林释氧量为83685.5 t,固碳量为113672.8 t.
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