甘肃泾川3种径级刺槐林的冠层截留降雨作用

doi:10.11707/j.1001-7488.20140303

摘要/Abstract

摘要：

2010年生长季（6—10月）研究甘肃泾川县中沟小流域6.1~10.0，14.1~18.0和22.1~26.0 cm 3种径级刺槐林的冠层截留降雨作用。结果表明：研究期间的降雨总量为221.1 mm，6.1~10.0，14.1~18.0和22.1~26.0 cm这3种径级刺槐林的冠层截留总量占同期降雨量的比率分别为13.16%，15.11%和18.44%，树干茎流率分别为6.15%，5.49%和0.85%，林内穿透雨率分别为80.69%，79.40%和80.79%，表现为随着树木径级增大，冠层截留增大、树干茎流减小、穿透雨相差不大；对于次降雨事件，随着降雨量增大，林冠截留量呈对数函数增大，林冠截留率呈对数函数减小；树干茎流量呈线性增大，树干茎流率呈对数形式增大；穿透雨量呈线性增大，穿透雨率呈指数形式增大；20 mm的次降雨量是增减速度变化的一个阈值。

关键词: 黄土高原, 刺槐林, 径级, 冠层截留, 穿透雨, 树干茎流

Abstract:

The hydrological effects of canopy interception of three stands of black locust (Robinia pseudoacacia) with different DBH ranges were studied at the Zhonggou small watershed, Jingchuan County, Gansu Province of China, during the growing season (June-October) in 2010. The total rainfall during the study period amounted to 221.1 mm. The ratio of total canopy interception to total rainfall for the stands with the DBH range of 6.1-10.0, 14.1-18.0, 22.1-26.0 cm were 13.16%, 15.11% and 18.44%, respectively. The corresponding stem flow ratio was 6.15%, 5.49% and 0.85% and the throughfall ratio was 80.69%, 79.40% and 80.79%. There was a trend that the canopy interception increased with increasing DBH of forest stands, and the stem flow decreased, with unchanged in throughfall ratio. During single rainfall events, with increasing rainfall strength, the canopy interception increased in logarithmic form and the canopy interception ratio decreased in logarithmic form; the stem flow increased in lineal form and the stem flow ratio increased in logarithmic form; the throughfall increased in lineal form and the throughfall ratio increased in exponential form. The rainfall of 20 mm is a threshold for the change rate of interception.

Key words: Loess Plateau, black locust plantation, DBH ranges, canopy interception, throughfall, stemflow

中图分类号:

S715.2

王安民, 任烨, 王彦辉, 韩芬, 张俊明. 甘肃泾川3种径级刺槐林的冠层截留降雨作用[J]. 林业科学, 2014, 50(3): 16-21.

Wang Anmin, Ren Ye, Wang Yanhui, Han Fen, Zhang Junming. Canopy Interception Effects of Three Stands of Black Locust with Different DBH Ranges at Jingchuan, Gansu, China[J]. Scientia Silvae Sinicae, 2014, 50(3): 16-21.

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