晋西黄土区林下地表随机糙度的特征

Surface random roughness of forestland in the Loess area of Shanxi Province

为查明黄土区林下地表随机糙度的特征及地表随机糙度随植物生长季的变化规律,以晋西黄土区蔡家川流域13个径流小区为研究对象,利用针状糙度计对其地表随机糙度进行测量,分析不同林分密度的地表随机糙度。结果表明:地表随机糙度与林分密度呈较好的正相关;13个径流小区在3个生长时期地表随机糙度不同,具体表现为生长旺盛期>生长初期>生长末期,呈现倒"V"型;同一地块,荒草坡地表随机糙度大于灌木林地表随机糙度;天然林的地表随机糙度变化幅度小于人工林的地表随机糙度。

Based on the investigation of 13 plots of the Loess area in Shanxi Province, The changes of the surface random roughness with stand density and growth season were studied by the needle roughness instrument. The results show that the surface random roughness is significantly and positively correlated to stand density, y = 0.001 5x ＋ 0.314 9, R^2= 0.935 3. Every plot is different from surface random roughness. On the same area, surface random roughness of barren grass slope 〉 shrubbery＇ s. And The surface random roughness varied with growth season, August 〉 April 〉 October, and appear inverted ＂V＂ form. The change extent of surface random roughness under natural forest is smaller than the artificial forest.