摘要
采用径流小区定位观测法,对尤溪粉砂岩发育的山地红壤炼山后植杉至幼林郁闭的连续4年的研究表明,炼山后第一年24°和32°杉木幼林地的土壤侵蚀量分别达43.21t/ha和31.09t/ha,均属中度侵蚀,随着杉木生长,林地盖度增加,水土流失急剧下降。杉木幼林地水土流失主要发生在幼林郁闭前3年,不合理的幼林抚育措施加剧幼林地水土流失。逐步回归分析结果表明,降雨量和坡度是影响炼山后第一年杉木幼林地水土流失的主要因子,所建立的预测预报方程对类似地区水土流失预测预报有一定的指导意义。
The method of the fixed position observation of the runoff plots was utilized to study water, soil and fertility loss for continuous 4-year from controlled burning to young growth closing in the areas of red soil. The results showed that the soil erosion amounts of 24° and 32° for Chinese fir young growth land were 43.21t/ha and 31.09t/ha respectively in the first year after controlled burning, they all belong to medium erosion. Along with growth of Chinese fir and increase of woodland cover degree, soil and water loss suddenly decrease. The soil and water loss of Chinese fir young growth land major occur in the third year before closing of Chinese fir young growth, soil and water loss is aggravated by irrational manage measures of Chinese fir young growth land. The multiple regression analysis results showed that the main factors influencing soil and water loss of Chinese fir young growth land were amounts of precipitation and slope degree in the first year after contrllled burning, the forecasting equation have a certain significance for forecasting soil and water loss of similar areas.
出处
《水土保持学报》
CSCD
北大核心
1993年第3期32-36,共5页
Journal of Soil and Water Conservation
基金
国家"七五"攻关课题"杉木人工林集约栽培技术的研究"的部分成果
关键词
杉木
幼林地
径流量
水肥流失量
Chinese fir young growth land amount of runoff amonut of soil loss forecasting equation
