摘要
为探索香椿林林冠截留机理以及评估其水土保持功能提供理论依据,以贵州省镇宁县香椿林为对象,于2010年8月、10月、11月定位监测不同林龄林冠层共17次降雨截留分配效应。结果表明:1)在一定的降雨量范围内,随着降雨量的增加,穿透雨量、树干径流量和林冠截留量均增加,林冠截留率降低。2)8～13a、15～20a、25a以上香椿林林内降雨量分别为43.36mm、39.01mm和34.01mm,平均穿透降水率分别为64.95%、54.19%和44.48%;树干径流量分别为0.29mm、0.23mm和0.17mm,平均树干径流率分别为0.15%、0.11%、0.08%;林冠截留量分别为26.41mm、35.36mm和44.55mm,平均截留率分别为40.09%、51.77%、61.65%。3)在同一降雨量条件下,8～13a香椿林林冠截留量最小,而穿透雨量最大;15～20a香椿林林冠截留量居中,穿透雨量也居中;25a以上香椿林林冠截留量最大,而穿透雨量最小。
A total of 17 precipitation events were positioning monitored in Zhenning County of Guizhou Province in August, October and November of 2010 to explore its mechanism and provide a theoretical basis for evaluating its water holding capacity. The results showed that.. 1） When the precipitation increased within a certain range, the throughfall, stem flow and canopy interciption all increased, but the canopy interception rate decreased. 2） The throughfall were 43. 36 ram, 39. 01 mm and 34. 01 mm respectively of 8~13, 15~20 and 25 years old T. sinensis forest. The average precipitation rates were 64. 950/oo, 54.19~/00 and 44.48~/00 respectively; The stem flow were 0.29 ram, 0.23 mm and 0.17 ram, the average stem flow＂ rates were 0.15 ~, 0.11 ~//00 and 0. 080//00 separately; The canopy interception were 26.41 mm, 35.36 mm and 44. 55 mm, with the average canopy interception rates of 40. 09~/00, 51. 77~//oo and 61.65~. 3） Under the same condition of precipitation, the canopy interciption was the smallest,and the throughfall was the greatest of 8 ~ 13 years old T. sinensis forest; The canopy interciption and the throughfall were all intermediate of 15~20 years old T. sinensis forest; The canopy interciption was the greatest and the throughfall was the smallest of 25 years old T. sinensis forest.
出处
《贵州农业科学》
CAS
北大核心
2013年第1期153-157,共5页
Guizhou Agricultural Sciences
基金
贵州省林业科学技术研究项目"香椿多用途效益研究"(2006-15)
关键词
香椿
降雨量
树干径流量
林冠截留量
穿透雨量
Toona sinensis
precipitation
stem flow
canopy interception
throughfall
