森林枯落物和土壤持水特性原位测定方法及其变化规律对水分传输影响机理研究

开展森林枯落物层和土壤层持水特性研究，不仅有助于深入理解森林生态系统涵养水源的机理，也有利于森林经营管理的可持续性发展。现有观测方法难以实现枯落物和土壤持水特性的原位在线测定，故无法对冻融、降雨、枯落物分解、人类营林活动等引起的持水特性变化进行动态监测。因此，本项目拟通过创新性地实现森林枯落物和土壤持水特性关键指标的原位测定为突破口，综合考虑枯落物和土壤垂直剖面的时空变异性以及自然事件或人为事件对两者持水特性的影响，以实现枯落物和土壤持水特性动态变化的原位长期监测，并进一步揭示持水特性变化对水分传输过程的影响机理，为客观评价森林水文效应以及合理开展森林资源管理与生态环境建设提供重要的理论依据和科技支撑。

To study the water-holding characteristics of forest floor andmineralsoil is not only helpful to understand the mechanism of water conservation in forest ecosystem, but also conducive to the sustainable development of forest management. The existing detection methods can’t measure the water-holding characteristics of forest floor and mineral soil, so it is impossible to dynamically monitor the changes of water-holding characteristics caused by freeze-thaw, rainfall, litter decomposition or human forest activities. Therefore, this project intends to innovatively develop the in-situmeasuring methods to obtain the key parameters ofwater-holding characteristics of forest floor and mineral soil. Furthermore, comprehensively considering the temporal and spatial variability ofthe vertical profiles of forest floor and mineral soil, as well as the effects of natural or man-made events on the water-holding characteristics, this project would long-term monitor thedynamic changes of water-holding characteristics of forest floor and mineral soil in-situ. On this basis, we would further reveal theinfluence mechanism of water-holding characteristics on thewater transfer process between forest floor and mineral soil. The research findings can provideimportant theoretical basisand technological support for objective evaluation of forest hydrological effect and rational development of forest resource management and ecological environment construction.