百花山5种典型林分枯落物蓄积量及持水特征

The Litter Storage Capacity and Water-holding Characteristics of 5 Typical Forests in Baihua Mountain

以北京百花山国家级自然保护区5种典型林分类型为研究对象,对其枯落物层的蓄积量及持水特性进行定量分析。结果表明:5种林分枯落物蓄积量中华北落叶松林(15.75t/hm^2)>核桃楸林(9.99t/hm^2)和白杄林(10.27t/hm^2)>蒙古栎林(7.34t/hm^2)>黑桦(7.04t/hm^2),针叶林枯落物层中未分解层蓄积量占比明显高于阔叶林分;枯落物蓄积量总持水量中华北落叶松林(2.91mm)>核桃楸林(2.77mm)>黑桦(1.90mm)与蒙古栎林(1.83mm)>白杄林(1.29mm),针叶林枯落物层中未分解层持水量大于半分解层,而阔叶林枯落物层则表现为半分解层大于未分解层。针叶林未分解层枯落物的蓄积及水文效应高于半分解层,而阔叶林半分解层枯落物的蓄积及水文效应高于未分解层。

Taking five typical forest types in the Baihuashan National Nature Reserve as the research object,the litter accumulation and water holding characteristics of the five forest types in Baihuashan were quantitatively analyzed.And the results show that,among the litter accumulations of 5 types of forests in Baihua Mountain,Larix gmelinii(15.75 t/hm^2)>Juglans mandshurica(9.99t/hm^2)>Picea meyeri(10.27t/hm^2)>Mongolia oak(7.34t/hm^2)>Betula nigra(7.04t/hm^2),the proportion of undissolved layer in litter layer of coniferous forest was significantly higher than that of broad-leaved forest;among the total water holding capacity of 5 forests in Baihua Mountain,Larix gmelinii(2.91mm)>Juglans mandshurica(2.77mm)>Betula nigra(1.90mm)>and Mongolia oak(1.83mm)>Picea meyeri(1.29mm);in the litter layer of coniferous forest,the water holding capacity of undissolved layer is greater than that of semi-decomposed layer,while in the litter layer of broad-leaved forest,the water holding capacity of semi-decomposed layer is greater than that of non-decomposed layer.The accumulation and hydrological effects of litter in the undissolved layer of coniferous forest were higher than those in the semi-decomposed layer,while those in the semi-decomposed layer of broad-leaved forest were higher than those in the undissolved layer.