不同林分类型凋落物的蓄水功能

Hydrological Effects of Litters in Different Forest Types

采用野外实地观测与室内分析相结合的方法 ,对 5种不同林分林型下凋落物的水文效应进行的研究表明 :凋落物的存储量动态变化幅度为 4 .1 54 9～ 1 0 .1 86 3t/hm2 ,其排列顺序为 :樟子松林 >落叶松林 >蒙古栎林>水曲柳林 >白桦林 ;凋落物持水率动态变化幅度为 31 1 .49%～ 682 .60 % ,排列顺序为 :水曲柳林 >蒙古栎林 >白桦林 >落叶松林 >樟子松林 ;同一林型不同郁闭度条件下 ,凋落物的数量及持水量随着郁闭度的增加相应增大 ,但持水率降低 ;阔叶林的持水量及持水率以半分解层为最大 。

Based on field observation combined with analysis in experiment, the hydrological effects of litters in five kinds of forest types were studied in Maoershan Experimental Forest Farm. Results are as follows: the storage of litters in different forests ranges from 4.154 9 to 10.186 3 t/hm 2, which is in the order of Scots pine, Dahurian larch, Mongolian oak, Manchurian ash birch and. The dynamics of water content ratio of litters in different forests range from 311.49% to 682.60% which is in the order of Manchurian ash, Mongolian oak, birch, Dahurian larch and Scots pine. The storage of litters and the water content get increasing with the increase of the closure, but decreasing for the water content ratio in the same stand. The water capacity and its ratio of semi-decompound litter layer are the highest in broadleaved forests, but the water capacity is the highest in the full-decompound layer for the conifer plantation.