تلخیص
Pore size and shape distribution control hydraulic properties and root penetration. It changes with profile development and management practice. Changes in pore size distribution in a Typic Us tort he nt due to pedogenesis from Pleistocene calcareous loess were demonstrated using mercury intrusion porosimetry. The total pore I surface area varied from 6.3 ml g to 7.2 m2 g' in the I profile while revealing slight increase toward the soil I surface, The Ap had larger median pore diameter (7.40 I pm) as compared to the undijferentiated parent loess (1.06 I pm). Also, cumulative mercury intrusion associated with I the transmission and storage pores increased towards the I surface while the cumulative mercury intrusion associated I with the residual and cryptopores remained unchanged in I the profile. In the Ap horizon largest accumulation was in I the bigger pores ranging from 11 to 8 pm in dia. I Incremental Hg-intrusion in the pores of 11 to 8 pm I diameter decreased progressively with the profile depth but I // also increased in the 1.1 to 0.8 um diameter pores. Pore I size distribution in the 2CI and 2C2 horizons was almost I - mpnomodel where the 1.1 to 0.8 um diameter pores I contributed >80% to the total porosity, while in the Ap and I Ck horizons significant portion of the total porosity was I due to the pores of 11 to 8 um dia. Monomodel distribution I of pores in the 2C1 and 2C2 is due to uniformity and I narrow range of particle size distribution and lack of I development of soit structure in the 2C1 and 2C2 horizons
M. Sale em Akhtar, M eh mood ul Hussan. (1995) PROFILE DEVELOPMENT-PORE SIZE DISTRIBUTION RELATIONS IN A LOESS SOIL AS DETERMINED BY MERCURY INTRUSION POROSIMETRY, The Journal Soil & Environment , Volume 10, Issue (1-4).
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