| 祁连山地区林下地被物持水量与采样方法的关系研究 |
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| 引用本文： | 杨军军,何志斌,蔺鹏飞.祁连山地区林下地被物持水量与采样方法的关系研究[J].冰川冻土,2021,43(2):610-617. |
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| 作者姓名： | 杨军军 何志斌 蔺鹏飞 |
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| 作者单位： | 咸阳师范学院,陕西咸阳712000;中国科学院西北生态环境资源研究院中国生态系统研究网络临泽内陆河流域研究站/内陆河流域生态水文重点实验室,甘肃兰州730000 |
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| 基金项目： | 国家自然科学基金项目(41901050);咸阳师范学院专项科研基金项目(XSYK18055) |
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| 摘 要： | 林下地被物持水量的准确计算对生态环境脆弱的寒区水文功能的模拟和预测尤为关键。本研究以青藏高原北麓的祁连山典型流域为研究区，对原状和散状两种采样方法下，青海云杉林下苔枯层（苔藓与枯落物形成的层状结构）持水特征参数的差异进行分析，探讨不同采样方法在林下苔枯层水文特征研究时的影响。本研究中原状样本采用PVC管取样，散状样本采用尼龙网袋取样，获得2 596个实验数据。研究发现平均厚度为14.3 cm的原状苔藓与苔枯样本最大持水量分别为2.29 kg·m-2与5.42 kg·m-2，最大持水率分别为2 071%与890%，散状苔藓最大持水率为610%。苔枯层与苔藓层的最大持水量差异显著，苔枯层相比苔藓层具有更好的保水功能，林下地被物水文特征量化时应区别对待；相比于原状样本，散状采样方法下苔藓层的最大持水率被低估近70.5%，即在散状采样方法下，林下苔藓层的最大持水率会被严重低估；地被物脱湿曲线为幂函数，蒸发时长为4.8~5.6 h，关键参数的估算对于地被物水分蒸发过程的模拟和预测具有重要参考价值。不同采样方法对地被物持水量的估算差异显著，实践中应根据实验目的和研究对象，选择合适的采样方法。
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| 关 键 词： | 寒区水文 最大持水量 地被物 苔藓 祁连山 |
| 收稿时间： | 2019-10-31 |
| 修稿时间： | 2020-05-12 |
Study on the relationship between water holding capacity and sampling methods of forest understory in the Qilian Mountains |
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| YANG Junjun,HE Zhibin,LIN Pengfei.Study on the relationship between water holding capacity and sampling methods of forest understory in the Qilian Mountains[J].Journal of Glaciology and Geocryology,2021,43(2):610-617. |
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| Authors: | YANG Junjun HE Zhibin LIN Pengfei |
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| Institution: | 1.Xianyang Normal University，Xianyang 712000，Shaanxi，China;2.Linze Inland River Basin Research Station，Chinese Ecosystem Research Network / Key Laboratory of Inland River Basin Ecohydrology，Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China |
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| Abstract: | The accurate calculation of the water holding capacity of forest understory is especially critical for the simulation and prediction of the hydrological functions in the cold region with fragile ecological environment. In this study， the typical watershed of the Qilian Mountains in the northern foot of the Qinghai-Tibet Plateau was taken as the study area， the hydrological characteristics parameter differences of the original and scattered moss sampling methods were used to find out the effect of the sampling methods of the moss-litter hydrological parameters quantification， the undistributed moss sampled with PVC tubes， the scattered moss sampled with nylon bags and 2 596 data was obtained. The main results and conclusions were obtained as follows， the maximum water holding capacity of the undisturbed moss with an average thickness of 14.3 cm and moss-litter were 2.29 kg?m-2 and 5.42 kg?m-2， the water holding rate was 2 071% and 890%， and the water holding rate of the scattered moss was 610%. The moss-litter layer showed a significantly better water retention function than the moss layer， so it should be treated differently when we calculating the hydrological characteristic parameters. Compared with the undisturbed sample， the maximum water holding capacity of the moss layer was underestimated as much as 70.5% with a scattered sampling， that is， under the scattered sampling method， the maximum water holding capacity of the moss layer under the forest will be seriously underestimated. The soil water characteristic curve of drying conformed to a power function and the evaporation duration was 4.8~5.6 h， these key parameters will be important reference value for the modelling and forecasting of the moisture evaporation process of the forest understory. In summary， different sampling methods have significant differences in the estimation of ground cover water holding capacity. In practice， the sampling methods should be determined according to the experimental purpose and research object. |
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| Keywords: | cold region hydrology maximum water holding capacity understory moss Qilian Mountains |
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