Litter is an important constituent part in forestry ecosystem cycle ,with vital hydrological function ,which is determined primarily by litter amount .In this work ,litter amount under dominant tree species of Heihe district was surveyed .The result manifested litter amount of unit area was highest under Larix gmelinii ,up to 5 .46 t · hm -2 , while it was lowest under Pinus sylvestris ,only with 1 .08 t · hm -2 .Under A lnus japonica ,Populus davidiana , Quercus mongolica ,Betula platyphylla ,Betula dahurica ,it was from 2 .93 to 4 .9 t · hm -2 .%枯落物是森林生态系统物质循环的一个重要组成部分，具有极为重要的水文功能，枯落物水文生态功能的发挥首先取决于枯落物的量。通过对黑河地区不同优势树种林下枯落量的调查与测定，结果表明：黑河地区各种优势树种中，落叶松的单位面积上枯落物总干质量最大，达到5．46 t 灋hm -2，而樟子松的单位面积上枯落物总干质量最小，只有1．08t 灋hm -2，赤杨、山杨、柞树、白桦、黑桦单位面积上枯落物总干质量为2．93～4．9t 灋hm -2。
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