论文部分内容阅读
对大兴安岭经过1987年“5.6”大火重度火烧后恢复的4种林分类型的枯落物和土壤持水能力进行了研究。结果表明:4种林分型林地枯落层和土壤层的持水量存在差异,枯落物现存量变化范围在8.65 t hm-2~37.84 t hm-2之间,枯落物最大持水量为兴安落叶松林>樟子松林>白桦林>山杨林,人工恢复下林地的枯落物持水量要好于天然恢复下林地的枯落物持水能力。土壤总孔隙度的变化范围在51.46%~66.59%之间,土壤最大持水量分别为白桦林665.9 t hm-2、兴安落叶松林597.5 t hm-2、山杨林559.5 t hm-2、樟子松林514.6 t hm-2。依据林地最大蓄水量来判定,4种林分类型林地水源涵养能力为兴安落叶松林(721.28 t hm-2)>白桦林(715.8 t hm-2)>山杨林(598.1 t hm-2)>樟子松林(573.35t hm-2)。因此,兴安落叶松林和白桦林的林地持水能力要好于樟子松林和山杨林。
The litter and soil water holding capacity of four forest types recovered in Daxing’anling after heavy fire in 1987 and “5.6” fire were studied. The results showed that the water holding capacity of litter and soil layers in four forest types differed from each other, with the existing stock of litter ranging from 8.65 t hm-2 to 37.84 t hm-2. The maximum litter holding capacity was Larix gmelinii forest> Pinus sylvestris> Betula platyphylla forest> Populus euphratica forest, the water holding capacity of litter under the artificial restoration was better than that of the litter under natural restoration. The total soil porosity ranged from 51.46% to 66.59%. The maximum soil water holding capacity was 665.9 t hm-2 for birch forest, 597.5 t hm-2 for Larix gmelinii forest, 559.5 t hm-2 for Populus davidiana forest, Pine forest 514.6 t hm-2. According to the maximum storage capacity of forestland, the water conservation capacity of four forest types was Larix gmelinii forest (721.28 t hm-2)> birch forest (715.8 t hm-2)> Aspen forest (598.1 t hm-2) > Pinus sylvestris (573.35t hm-2). Therefore, Larix gmelinii and Betula platyphylla forest water holding capacity is better than Pinus sylvestris and Aspen forest.