朝阳地区不同植被类型枯落物持水特性研究

Study on Litter Water-holding Characteristics of Different Vegetation Types in Chaoyang Area

以朝阳地区典型的针叶、阔叶天然次生混交林和荆条及其他天然次生混交灌丛为研究对象,探讨该区不同植被类型枯落物层的持水效应,结果表明:不同植被类型枯落物半分解部分的体积比和质量不同程度高于未分解部分。天然次生混交林的枯落物厚度及储量明显高于天然次生混交灌丛,阔叶与针叶天然次生混交林之间、荆条与其他天然次生混交灌丛之间差异不显著。针叶天然次生混交林枯落物最大持水率最高,阔叶天然次生混交林枯落物持水量最大。枯落物层越厚,持水性能越强,枯落物半分解层对整体持水效果的影响比未分解层更大。不同植被类型枯落物层持水效应为阔叶天然次生混交林>针叶天然次生混交林>其他天然次生混交灌丛>荆条天然次生混交灌丛。

Water holding effect of litter layers of coniferous forests,broad-leaved natural secondary mixed forests,vitex and other natural secondary mixed shrubs in Chaoyang area had been researched in this paper.The results showed that volume ratio and weight of the litter semi-decomposed parts were higher than those of the undecomposed parts.Thickness and storage of litters in the natural secondary mixed forests were significantly higher than those in the natural secondary mixed forests,but there were no significant differences between the broad-leaved and coniferous forests,neither between vitex and other natural secondary mixed shrubs.The maximum water holding rate of litters in coniferous natural secondary mixed forests was the highest,while the litter water holding capacity of broad-leaved natural secondary mixed forests was the largest.The thicker litter layer,the stronger water-holding capacity had.Semi-decomposed parts of litters had a greater effect on the overall water holding effect than the undecomposed parts.Water holding effect of litter layers in different vegetation types is that broad-leaved natural secondary mixed forests>coniferous natural secondary mixed forests>other natural secondary mixed shrubs>vitex natural secondary mixed shrubs.