抚育管理对米槠人工幼林地水土流失的影响

Effects of Tending on Water and Soil Erosion in Castanopsis carlesii Young Forest

于2012年4月至2015年3月期间分别对米槠人工幼林进行6次抚育管理,同时对幼林地抚育前后径流量和泥沙量进行观测,并与米槠次生林内的自然流失量（对照）进行比较。结果表明：除第1次抚育（2012年7月18日）外,其余5次抚育显著增加了幼林地径流和泥沙量,抚育后的径流量是抚育前的1.7-2.5倍,平均为2.1倍;抚育后的泥沙量是抚育前的2.2-9.8倍,平均为4.7倍;抚育前米槠人工幼林的径流量和泥沙量分别是米槠次生林自然产流量的2.4-6.0倍和2.3-4.7倍,抚育后人工幼林产流量和泥沙量分别是次生林的4.4-14.7倍和3.2-24.8倍;幼林抚育极大地增加了米槠幼林地和次生林之间的水土流失差异。

Forest tending was carried out six times in Castanopsis carlesii young forest during April 2012 and arch 2015. Water and soil erosion of pre-and-post tending were investigated in the forest and compared with the natural erosion occurred in Castanopsis carlesii secondary forest. The results indica- ted that forest tending contribute to increases in both runoff and sediment yield, with the first tending （July 18th, 2012） being an exception; the pre-tending yield of runoff and sediment was respectively 1.7 -2.5 times and 2.2 -9. 8 times as much as post-tending yield, with 2. 1 times and 4.7 times be- ing an average correspondingly; runoff and sediment yield in Castanopsis carlesii young forest was re- spectively 2.4 - 6. 0 and 2.3 - 4.7 times as high as in secondary forest before tending, and 4.4 14.7 times and 3.2 -24. 8 times after tending; water and erosion gap between Castanopsis carlesii young forest and Castanopsis carlesii secondary forest were aggravated because of tending.