摘要
本文研究了宝山县五种主要土壤的水分物理特征,主要结果如下:1.测定了本县五种主要土壤的饱和含水量、田间持水量、生长阻滞水分点、初始凋萎点以及永久凋萎点五种水分常数,据此进行了土壤水分分类;2.不同层段土壤的非毛管孔隙分布,以耕作层和淋溶层稍高,犁底层和淀积层极低;3.砂质土壤上作物正常生育有效水和速效水的水容量较之粘质土壤为高,但迟效性有效水和速效水的水容量则相反;4.土层垂直向的渗透性能显著大于水平层向。从垂直层向来看,耕作层、淋溶层较高,淀积层、犁底层极低。
This article deals with the water physical characteristic of five kinds of main soil types in Baoshan County.The primary results and conclusions are as follows.1. Five sorts of water constants namely, saturated humidity, field moisture capacity, plant growth-retarding humidity, initial wilting humidity and permanent wilting point of five kinds of main soil types are determined and. soil water classification is established.2. Water characteristic curve of five kinds of main soil types in Baoshan County is set up. 3. For the distribution of non-capillary pores, the pore amount is much greater in plowing horizon or leached horizon than in plow sole or accumulation horizon. 4. The capacities of available water for normal plant growth and quick-available water are higher in sandy soil than in clay soil. Inversely, the capacities of slow-avaiable water and non-available water are higher in clay soil than in sandy soil. 5. The permeability of soil is higher in vertical direction than in horizonal direction and the permeability coefficient is higher in plowing horizon and leached horizon than in plow sole and accumulation horizon.
出处
《上海农业学报》
CSCD
1990年第2期49-56,共8页
Acta Agriculturae Shanghai
关键词
土壤
水分物理特征
宝山县
Waterconstant, Soil water characteristic curve,Soil pore space character,Water liberating property,Water capacity, Permeability coefficient
