黄土高原油松人工林根系改善土壤物理性质的有效性模式

在调查根系参数和测定土壤物理性质的基础上,首先对油松人工林不同深度根系对土壤物理性质的改善效应及其与根系相互作用的关系进行了定量分析。结果表明,根系改善土壤物理性质的效应与有效根密度(≤1mm的须根)在剖面中的分布规律一致,均呈指数递减规律,其垂直变化可分为四个明显区域,土壤物理性质改善效应与≤1mm的须根密度(即有效根密度)比与根量的关系更为密切,在P<0.001极显著水平上呈线性正比关系。据此建立了油松人工林根系改善土壤物理性质的有效性模式。

EFFECTIVE MODEL OF IMPROVING SOIL PHYSICAL PROPERTY BY ROOTS OF CHINESE PINE PLANTATION ON THE LOESS PLATEAU

Based on the investigations of root parameters and soil physical properties, the improving effects of soil physical properties by the roots in different depth of soil in Chinese pine plantation and their inter-action have beenfirst quantitatively demonstrated in this paper. The results show that theeffects of roots to improve soil physical properties are consistent with thedistributing rule of effective root density (fibrous less than 1mm in diame-ter) in soil profile, which follows the decreasing law of exponential func-tion. The vertical changes of roots in improving the soil physical propertiescan be divided into 4 obvious areas of soil layers, and the effects of rootson improving soil physical properties corelate more closely with effective rootdensity than with root weight, and which show a learn positive relation ata significant level (p<0.001). Therefore, an effective model of improvingsoil physical properties by the roots of Chinese pine plantation is established.The value of the model is to plain the mechanism of stabilizing soil structure by roots and to evaluate the effectiveness of roots for improving the physical properties of soil.