Suspended-sediment responses after strip thinning in headwater catchments
Suspended-sediment responses after strip thinning in headwater catchments
复制标题
源头流域带状减薄后悬浮泥沙的响应
DOI：
10.1007/s11355-015-0284-0
复制
发表时间：
2016
影响因子：
2
通讯作者：
H.
中科院分区：
文献类型：
--
作者：
Nam;S.;Hiraoka;M.;Gomi;T.;Dung;B. X.;Onda;Y.;Kato;H.
我们研究了排干日本雪松和柏树人工林的源头溪流经过50%的带状稀疏后悬浮泥沙产量(SSY)的变化。我们对处理(KT：17.1公顷)和对照(KC：8.9公顷)流域进行了成对流域分析。KT和KC流域稀疏期年悬沙产沙量分别为110.0和142.1 kg/hm2。疏伐后，KT集水区SSYan值为5055.6 kg/hm2，KC集水区SSYan值为893.2 kg.ha/hm2。成对集水区分析表明，KT集水区的SSY比疏伐前增加了17.0倍。然而，在稀疏前后，主要的磁滞模式仍然是顺时针方向。稀疏期后的大风暴事件序列使两个流域的SSY升高。KT集水区悬浮泥沙的增加与间伐作业期间的间歇和风暴事件的综合影响有关。
We examined changes in suspended-sediment yields (SSY) after a 50 % strip thinning in headwater streams draining a Japanese cedar (Cryptomeria japonica) and cypress (Chamaecyparis obtusa) plantation forest. We applied a paired-catchment analysis to treated (KT: 17.1 ha) and control (KC: 8.9 ha) catchments. Annual suspended-sediment yield (SSYan) in the prethinning period in theKTandKCcatchments was 110.0 and 142.1 kg/ha per year. For the postthinning period, SSYanin theKTcatchment became 5055.6 kg/ha per year, whereas that in theKCcatchment increased 893.2 kg/ha per year. The paired-catchment analysis revealed that SSY in theKTcatchment increased 17.0-fold compared with the prethinning period. However, the dominant hysteresis pattern remained clockwise in both pre- and postthinning periods. Sequences of large storm events in the postthinning period elevated SSY in both catchments. Increase in suspended sediment in theKTcatchment was associated with the combined impacts of thinning and sequences of storm events during the period of thinning operation.