With the data of four 40 m ×40 m sample plots from primary larch forest and conifer-hardwood mixed forest in the Huzhong National Nature Reserve in Daxing’an mountain, we studied the water conservation of the litterfall in larch forest, and white birch (Betula platyphylla) and Larch (Larix gmelini) mixed forest with different tree composition.We meas-ured the accumulation and water holding capacity for different litterfall component for each plot.The accumulation and wa-ter holding capacity of forest litter of different forest type are 17.46 t/hm2-22.48 t/hm2 and 60.30 t/hm2-81.48 t/hm2 , respectively .They both have significant difference among different forest types and both decrease with the reduction of larch ratio, i.e., 10 Larch>8 Larch 2 White birch>6 Larch 4 white birch>4 Larch 6 White birch.The sequence of the ef-fective to the rainfall of the different forest litterfall in the various tree compositions is 4 Larch 6 White birch>6 Larch 4 white birch>10 Larch>8 Larch 2 White birch.There is the highest correlation between the effective interception of the semi-decomposed and the rainfall with the correlation coefficient of 0.820.%以大兴安岭地区呼中国家自然保护区针阔混交的原始林为研究对象，在不同树种组成的林分中设置4块40 m×40 m标准地，通过枯落物不同组分累积量以及持水量的测定、计算和分析，对落叶松林和白桦-落叶松混交林枯落物水源涵养功能进行了研究。结果表明：各类型林分的枯落物干物质累积量为17．46～22．48 t/hm2，枯落物最大持水量为60．30～81．48 t/hm2，两者均在各林分间差异显著，都随着落叶松所占比例的减小而减小，由大到小顺序为：10落、8落2白、6落4白、4落6白。不同树种组成的林分枯落物对降雨的有效拦蓄量由高到低的顺序是4落6白、6落4白、10落、8落2白，且与半分解有效拦蓄量相关性最高，相关系数达到0．820。
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