元阳梯田水源区优势树种枯落物水文特性

发布时间：2018-07-03 02:53

本文选题：元阳梯田 + 枯落物　；参考：《水土保持研究》2017年01期

【摘要】：对元阳梯田水源区优势树种枯落物水文特性的研究,有利于进一步揭示森林的水源涵养功能。通过野外调查采样与室内试验分析,对元阳梯田优势树种枯落物储量、持水能力、拦蓄能力以及持水过程进行了研究。结果表明:枯落物总储量为6.06~8.2t/hm~2,半分解层的枯落物储量绝大多数要大于未分解层;枯落物总厚度为6.1~8.8cm,半分解层厚度大于未分解层;枯落物半分解层自然含水率要明显高于未分解层;枯落物半分解层最大持水量要大于未分解层最大持水量,但是优势不明显,总枯落物层最大持水率为132.1%~247.3%;枯落物总的有效拦蓄量为2.07~8.01t/hm~2,其中未分解层的有效拦蓄量要大于半分解层;枯落物层持水量与吸水速率随时间变化过程中,在0~2h时间段内变化较大,浸水8h后,持水量与吸水速率两者的变化曲线均比较平缓,变化幅度较小;枯落物层持水量与浸水时间存在显著的对数关系,枯落物吸水速率与时间存在显著的幂函数关系。
[Abstract]:The study on the hydrological characteristics of litter of dominant tree species in Yuanyang terrace is helpful to reveal the water conservation function of forest. Through field investigation and laboratory test analysis, the storage of litter, water holding capacity, water holding capacity and water holding process of dominant tree species in Yuanyang terrace were studied. The results show that the total litter reserves are 6.06 ~ 8.2t / hm ~ (-2), most of the litter reserves in the semi-decomposable layer are larger than those in the undecomposed layer, the total thickness of the litter is 6.1 ~ 8.8cm, and the thickness of the semi-decomposable layer is larger than that of the undecomposed layer. The natural moisture content of the litter semi-decomposition layer is obviously higher than that of the undecomposed layer, the maximum water holding capacity of the litter semi-decomposition layer is larger than that of the undecomposed layer, but the advantage is not obvious. The maximum water holding capacity of the total litter layer is 132.1 / 247.3.The total effective storage capacity of the litter layer is 2.07 / 8.01 t / hm ~ (-2), in which the effective storage capacity of the undecomposed layer is larger than that of the semi-decomposed layer, while the water holding capacity and the water absorption rate of the litter layer vary greatly in the period of 02h. After 8 h of soaking, the curves of water holding capacity and water absorption rate were both gentle and the variation range was small, and there was a significant logarithmic relationship between the water holding capacity of litter layer and soaking time, and there was a significant power function relationship between water retention rate and water absorption time of litter.
【作者单位】：西南林业大学环境科学与工程学院;
【基金】：国家自然科学基金“基于氢氧同位素技术的哈尼梯田水源区土壤水分运移规律研究”(41371066)
【分类号】：S714

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