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| 1 | Impact of pH on Microbial Biomass Carbon and Microbial Biomass Phosphorus in Red Soils显示文摘The impact of pH changes on microbial biomass carbon (Cmic) and microbial biomass phosphorus (Pmic)were examined for 3 red soils under citrus production with different lengths of cultivation. Soil pH significantly affected Cmic and Pmic. The Cmic and Pmic changes, as a function of soil pH, appeared to follow a normal distribution with the original soil pH value at the apex and as pH increased or decreased compared to the original soil pH, Cmic and Pmic declined. Moreover, there were critical pH values at both extremes (3.0 on the acidic side and 8.0 to 8.5 on the alkaline side), beyond which most of microorganisms could never survive.The effect of pH on Cmic and Pmic was also related to the original soil pH. The higher the original soil pH was, the less Cmic or Pmic were affected by pH change. It is suggested that soil microorganisms that grow in a soil environment with a more neutral soil pH range (I.e. pH 5.5-7.5) may have a greater tolerance to pH changes than those growing in more acidic or more alkaline soil pH conditions. | CHENGuo-Chao HEZhen-Li WANGYi-Jun | 2004 | Pedosphere2004，14，1： | 32 |
| 2 | Interactions of Cations with Electrodialyzed Clay Fraction of Soils as Inferred from Wien Effect in Soil Suspensions显示文摘The electrical conductivities (ECs) of suspensions containing 25 and 30 g kg-1 solids prepared from theelectrodialyzed clay fraction (< 2 μm in diameter) of latosol, yellow-brown soil, and black soil, dispersed invarious nitrate solutions having concentrations of 1 × 10-4/z mol L-1, where z is the valence, and in distilledwater, were measured at field strengths ranging from 14 kV cm-1 to 210 kV cm-1. On the basis of analysesof the charge density and exchangeable ion composition on the surfaces of soil particles in the suspensions,and of the characters of the EC-field strength curves of the various suspensions, it was inferred that theincrement of EC (△EC) and/or relative electrical conductivity (REC) can indicate the bonding strengthbetween cations and soil particles. The bonding strengths of various cations with the soils diminished in theorder: K+ > Zn2+ > Mg2+ = Ca2+ > Na+ for latosol, Ca2+ > Zn2+ > Mg2+ = K+ > Na+ for yellow-brownsoil, and Zn2+ >Ca2+ > Mg2+ > K+ > Na+ for black soil. | LICHENGBAO S.P.FRIEDMAN 等 | 2003 | Pedosphere2003，13，1： | 9 |
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