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该文主要讨论了在陕、甘、宁境内作为黄土风成成因的主要颗粒组成从北向南或从西向东的分布规律,以砂粒、粗粉粒、粘粒及物理性粘粒四种粒级作为黄土风成成因的主要指标粒级,并讨论了随着土壤颗粒的变化,而产生的土壤一系列物理性质的变化:土壤比重愈向南愈大;土壤容重则是最南部及最北部最大,而中间过渡地带较小;对于破坏土壤(无结构的土壤),土壤质地愈粘重,渗透性能愈差,质地愈轻则渗透性能愈好,而对于有结构的原状土壤则恰好相反.另外,黄土地区的土壤水分常数如最大吸湿水、凋萎湿度、自然含水量及田间持水量亦是从北向南相应的逐渐递增变大,然而毛管持水量则是最南部及最北部较小,而中间过渡地带最大,和土壤粗粉粒分布规律恰相吻合.
This paper mainly discusses the distribution of the main particle components that form loess wind into North, South or West to East in Shaanxi, Gansu and Ningxia provinces. The distribution of sand, coarse grain, clay and physical clay As a major indicator of loess aeolian formation, the authors discussed the series of physical properties of soils as the soil particles changed: the larger the soil gravity, the greater the south; and the soil bulk density was the largest in the southern and northernmost , While the intermediate transitional zone is smaller; for the destructive soil (unstructured soil), the heavier soil texture, the poorer the permeability, the lighter the texture, the better the permeability, but the opposite for the structured undisturbed soil. , The soil moisture constants such as maximum moisture absorption, wilting humidity, natural water content and field water capacity in loess area also increased gradually from north to south correspondingly, however, the capillary water holding capacity was the smallest in the southernmost and the northernmost, The middle of the transition zone is the largest, and the distribution of coarse aggregates agree exactly.