摘要
于2005年4月,对不同地类、不同土层垂直深度、不同季节的土壤含水率进行了连续3 a的定位测定,并探讨了影响土壤含水率的相关因子。结果表明,红松郁闭林分土壤含水率为22.52%,均超过未郁闭的红松纯林和红松-白桦混交林。表层(0～10 cm)土壤含水率最高,为22.62%,并呈现出随土壤深度的加深而含水率逐渐减小。在水热同季的生长季节中,土壤含水率随季节的变化而变化,在降水大的年份土壤含水率达到24.28%,在一年中8月份土壤含水率最大(29.58%),7月份次之(23.18%);8月中旬土壤含水率最高(27.61%),7月上旬次之(25.89%)。土壤含水率与降水量呈密切的线性相关关系。在幼林培育中为了保持土壤中水分,建议加速幼林郁闭,增加地表覆盖度,提高土壤蓄水潜力,减少土壤蒸发。
Orientation determination of soil moisture content in Pinus koraiensis plantations was conducted on different types of land,at different vertical depth of soil layers and in different seasons for three consecutive years in April 2005.The related factors affecting soil moisture content were discussed.Results showed that the forests with closed-canopy had the highest soil moisture content（22.52%）,which was higher than that of the pure P.koraiensis plantations with unclosed-canopy and the mixed forest of P.koraiensis and Betula platyphylla.The surface soil layer（0-10 cm） possessed the highest soil moisture content（20.20%）,and the soil moisture content decreased with the deepening of soil layer.In the growing season with abundant quantity of heat and precipitation,the soil moisture content changed with seasons.The highest soil moisture content（24.28%） appeared in the year with abundant precipitation.August had the highest soil moisture content（29.58%）,followed by July（23.18%）.In terms of the three periods of each month,the highest soil moisture content（27.61%） occurred in the middle ten days of August,followed by the first ten days of July（25.89%）.There was a strong linear correlation between soil moisture content and precipitation.During the cultivation of young forests,the young forest should be closed as early as possible and increase the ground vegetation coverage in order to enhance soil water storage capacity and maintain soil moisture levels by reducing evaporation.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2011年第2期60-63,共4页
Journal of Northeast Forestry University
关键词
红松
人工幼林
土壤含水率
地类
生长季节
土层
Pinus koraiensis
Young plantations
Soil moisture content
Land types
Growing seasons
Soil layers
