Experimental analysis of moisture dynamics of litter layers - the effects of rainfall conditions and leaf shapes
Experimental analysis of moisture dynamics of litter layers - the effects of rainfall conditions and leaf shapes
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DOI：
10.1002/hyp.5746
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发表时间：
2004-11-01
影响因子：
3.2
通讯作者：
Ogawa, S
中科院分区：
文献类型：
--
作者：
Sato, Y;Kumagai, T;Ogawa, S
研究了降雨条件和叶片形态特征对凋落物层水分动态的影响。评估了两种对比凋落物类型在不同降雨条件下的最大蓄水能力和截留蓄水能力：以柳杉叶为代表的针叶型和以紫檀叶为代表的阔叶型。采用人工降雨模拟器测量不同降雨强度下每种凋落物类型的拦截蓄水能力。我们的结果表明：（1）无论层厚如何，每个凋落物层的最大储水能力与凋落物质量（kg/m（2））成正比；（2）在实际降雨条件范围内（50毫米/小时以下），凋落物截留存储能力随着降雨强度的增加而增加； (3) 榛子阔叶凋落物比粳稻针叶凋落物截留更多的雨水； (4)雨水在珍珠菜枯落物层中横向移动，而在粳稻枯落物层中则直接向下移动。这些结果表明，不仅凋落物质量，降雨条件和树叶形状对于评估凋落物层的水分动态也很重要。版权所有 (C) 2004 John Wiley Sons, Ltd.
The effects of rainfall conditions and the morphological characteristics of leaves on the moisture dynamics of litter layers were investigated. Maximum water storage capacity and interception storage capacity under various rainfall conditions were evaluated for two contrasting litter :types: a needle-leaf type, represented by Cryptomeria japonica leaves: and a broad-leaf type, represented by Lithocarpus edulis leaves. An artificial rainfall simulator was applied to measure each litter type's interception storage capacity under various rainfall intensities. Our results indicated that (1) the maximum water storage capacity of each litter layer was proportional to the litter mass (kg/m(2)) regardless of layer thickness, (2) the litter interception storage capacity increased with rainfall intensity in the range of realistic rainfall conditions (under 50 mm/h); (3) the broad-leaf litter of L. edulis intercepted more rainwater than the needle-leaf litter of C. japonica; and (4) the rainwater moved laterally in the litter layer of L. edulis whereas it moved directly down in the litter layer of C. japonica. These results show that not only the litter mass but also the rainfall conditions and leaf shapes are important in evaluating the moisture dynamics of litter layers. Copyright (C) 2004 John Wiley Sons, Ltd.