Runoff responses to forest thinning at plot and catchment scales in a headwater catchment draining Japanese cypress forest
Runoff responses to forest thinning at plot and catchment scales in a headwater catchment draining Japanese cypress forest
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DOI：
10.1016/j.jhydrol.2012.03.040
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发表时间：
2012-06
影响因子：
6.4
通讯作者：
B. Dũng;T. Gomi;S. Miyata;R. Sidle;K. Kosugi;Y. Onda
中科院分区：
文献类型：
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作者：
B. Dũng;T. Gomi;S. Miyata;R. Sidle;K. Kosugi;Y. Onda
我们研究了森林间伐对径流产生的影响，在小区和集水区尺度上，在源头流域排水的日本柏树（Chamaaparis obtusa）森林。我们在处理过的水源流域（集水区M5）中去除了58.3%的茎（相当于断面积的43.2%），并使对照集水区（M4）未经处理。在这两个集水区，我们监测坡面流从山坡地块和流域出口的径流超过2年的预疏期和2年后疏期。对流域分析表明，间伐后，年径流量增加了240.7mm。延迟径流显着增加，而快速径流遵循类似的模式在前和后间伐期。在集水区M5的短暂通道的流量持续时间增加了56.9%，在间伐前的73.3%，在后间伐期。尽管在集水区尺度的水文响应的变化，增加了地表径流并不显着。土壤基质中水分的有效性增加，减少截留损失和蒸散量，增加间伐后的基流。根据以往研究的总结数据，与本研究一起，森林间伐对径流量增加的影响小于部分采伐，其中管理区集中在一个流域内。我们表明，森林间伐的影响是强烈的规模依赖，优化森林流域的水和森林管理的一个重要发现。
We examined the effect of forest thinning on runoff generation at plot and catchment scales in headwater basins draining a Japanese cypress (Chamaecyparis obtusa) forest. We removed 58.3% of the stems (corresponding to 43.2% of the basal area) in the treated headwater basin (catchment M5), and left the control catchment (M4) untreated. In both catchments, we monitored overland flow from hillslope plots and stream runoff from catchments at basin outlets over a 2-year pre-thinning period and a 2-year post-thinning period. Paired catchment analysis revealed that annual catchment runoff increased 240.7mm after thinning. Delayed runoff increased significantly, while quick runoff followed similar patterns in the pre- and post-thinning periods. Flow duration in the ephemeral channel in catchment M5 increased from 56.9% in the pre-thinning period to 73.3% in the post-thinning period. Despite the changes in hydrological responses at the catchment scale, increases in overland flow were not significant. The increased availability of water in the soil matrix, caused by decreased interception loss and evapotranspiration, increased base flow after thinning. Based on the summarized data of previous studies together with this study, the effects of forest thinning on increases in runoff were less than partial harvesting in which the managed areas were concentrated within a watershed. We demonstrated that the effect of forest thinning was strongly scale dependent, an important finding for optimizing water and forest management in forested watersheds.