Page 11 - Enzymes in Tropical Soils

x Enzymes in Tropical Soils

6.3 Soil Water and Temperature versus the Lives of Microorganisms and
Macroorganisms – 91
6.4 Soil Water and Temperature versus Soil Biochemical Reactions – 94
6.5 Regulating Soil Water Contents and Temperature – 98
Important Questions – 100

Chapter VII:

EFFECTS OF pH ON SOIL ENZYMES – 102
7.1 Relationship between Soil pH and Enzymatic Activities – 107
7.2 Optimum pH and pH Levels for Analysis of Soil Enzymes – 110
7.3 The Shifting of Optimum pH – 112
7.4 Effects of Acidification on Soil Enzymatic Activities – 113
7.5 Manipulating and Regulating Soil pH – 116
Important Questions – 117

Chapter VIII:
EFFECTS OF NUTRIENT ELEMENTS ON SOIL

ENZYMES – 119

8.1 Effects of Mass Action Law – 120
8.2 Effects of P on the Activity of Phosphatases – 121
8.3 Effects of S on the Activity of Arylsulphatase – 122
8.4 Effects of Other Elements on the Activities of Soil Enzymes – 123
Important Questions – 125

Chapter IX:

EFFECTS OF HEAVY METALS ON SOIL ENZYMES –
126

9.1 Toxicities of Heavy Metals – 132
9.2 Direct Effects of Heavy Metals on Soil Enzymes – 133
9.3 Indirect Effects of Heavy Metals on Soil Enzymes – 137
9.4 Regulating Heavy Metals Levels in Soils – 139
Important Questions – 149