甘肃几种旱地土壤颗粒组成及其对土壤水分常数的影响

甘肃中部、东部地区的几种代表性土壤的颗粒组成中含量最多的是粗粉粒(0.05～0.01mm),土壤质地以壤土为主。最大吸湿水含量和凋萎湿度与<0.01mm颗粒含量呈显著直线正相关。通过最大吸湿水含量计算得出的凋萎湿度与实测值具有很好的吻合性,因而在实际工作中可直接进行计算获得凋萎湿度,免去生物测试工作的烦琐。

The Particle Composition of Several Arid—region Soil of Gansu Province and Its Effect on Soil Moisture Constants

The particle composition of several arid-region soil of east and central part of Gansu Province and its effect on maximum hygroscopicity and wilting point moisture were studied in the paper. The results showed that the dominant particles of soil studied were particles 0.05-0.01mm, the textures of soil were mainly loam. It was also found that the particle composition had significant influence on soil maximum hygroscopicity and wilting point moisture. The maximum hygroscopicity and the wilting point moisture had significantly linear positive relation to the contents of particle <0.01 mm, and the values obtained by multiplying maximum hygroscopicity by 1.5 were very identical with the values of wilting point moisture measured with plant growth method, so the calculated values can be used to take place of wilting point moisture so that the overelaborate procedure to measure the moisture at wilting point could be got rid of.