论文部分内容阅读
本文对不同整地方式的水土保持作用和杉木幼林生长效果,进行了5年的连续定位观测。整地方式的水保作用与降雨量、降雨强度、前期降雨以及地形和抚育措施等均有密切关系。水保能力以穴垦最大,其次为水平带垦,再次为撩壕,全垦最小。平均每年每ha的固体迳流分别为0.023t,0.06t、0.454t、3.144t,液体迳流分别为0.92mm、1.76mm、4.68mm、9.68mm。全垦坡度超过25°,流失量急剧增加。但杉木幼林高生长,以撩壕的为最好,分别比全垦、水平带垦和穴垦高10.8％、35.5％、65.5％。单位面积以撩壕投工量最多,分别比全垦、水平带垦和穴垦多37.5％、53.8％、76.3％。
In this paper, the effect of different site-preparation methods on soil and water conservation and the growth of young Chinese fir plantations have been studied continuously for 5 years. The soil conservation effect of site preparation is closely related to rainfall, rainfall intensity, pre-rainfall, topography and tending measures. Water conservation ability to acreage the largest, followed by the level of reclamation, once again for the trench, the whole Ken minimum. The average annual solid hank current per ha was 0.023t, 0.06t, 0.454t and 3.144t respectively, and the liquid bleed was 0.92mm, 1.76mm, 4.68mm and 9.68mm respectively. Land reclamation of more than 25 °, the loss of a sharp increase. However, the growth of young stands of Chinese fir was the best, with the trenches being the best, being 10.8%, 35.5% and 65.5% higher than those of Quanken, Hedong reclamation and acreage respectively. The unit area to pull the trench to vote the most volume, respectively, than the full reclamation, horizontal reclamation and acreage 37.5%, 53.8%, 76.3%.