摘要:

SummaryA method for studying the soil‐water properties of soil profiles is described and its development for application in the field is suggested. The method consists of infiltrating water at a constant rate at the surface of the soil and determining the resulting steady‐state suction and moisture profiles down the soil profile. It has been applied for relating the pore‐water suction and hydraulic conductivity to the pore‐water content of a a‐m‐long so

ISSN:0022-4588    

DOI:10.1111/j.1365-2389.1973.tb00746.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY

摘要:

SummaryA soil profile preserved below a barrow of Neolithic age appears to have been a brown forest soil developed under deciduous woodland in which oak was an important component. There is evidence of Neolithic forest clearance.

ISSN:0022-4588    

DOI:10.1111/j.1365-2389.1973.tb00747.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY

摘要:

SummaryThe theoretically derived equation: log Alk–pH = log Pco2–7.82 describes the relation between three easily estimated parameters, viz. the composition (alkalinity), CO, partial pressure and the pH of the soil solution. This equation is also important for understanding the formation of alkaline soils. The concept of residual alkalinity, i.e. the difference between the alkalinity and the total concentration of the divalent cations in the soil solution (on an equivalent basis) is introduced. In a closed basin with excess evaporation over precipitation highly alkaline soils, i.e. soils with a pH above 8 to 8.5, develop if the inflowing water has a positive residual alkalinity. A number of processes, such as weathering, oxidation and reduction, cation exchange, precipitation, addition of neutral salts, evaporation, which may influence the alkalinity and residual alkalinity of natural waters and soils are discussed brie

ISSN:0022-4588    

DOI:10.1111/j.1365-2389.1973.tb00748.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY

摘要:

SummaryHydroxy Fe and A1 interlayers reduce the swelling of Na‐montmorillonite in NaCl solutions. A deposit of sesquioxide round an aggregate or orientated flake of clay restricts swelling until the sesquioxide coating is broken by the swelling pressure of the clay. A1 is more effective than Fe.The effect of sesquioxides on the permeability to NaCl solutions of an alkali soil depends on the control of clay swelling in a manner expected from the above results. A sesquioxide coating round a soil aggregate stabilizes the structure until the coating is broken by the swelling pressure of the clay in the aggregat

ISSN:0022-4588    

DOI:10.1111/j.1365-2389.1973.tb00749.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY