XIV CONTENTS 



PAGE 



Sheet Erosion 176 



Landslides 176 



River-Bottom Erosion 176 



Factors Influencing Erosion 177 



Steepness of Slope 177 



Type of Soil 178 



Texture 178 



Structure 178 



Organic Matter 178 



Pore Space 178 



Tenacity 178 



Rainfall 179 



Melting Snow 180 



Wind 181 



Vegetative Cover 182 



Erosion, Plant Growth, and Revegetation 182 



Erosion and Plant Growth 184 



Erosion and Revegetation 189 



The Solution of the Erosion Problem on Pasture Lands 191 



Avoidance of Overgrazing 191 



Avoidance of Too Early Grazing 191 



The Practice of Deferred and Rotation Grazing 192 



The Control and Distribution of Livestock 192 



Terracing and Planting 192 



How More Than Half of the Erosion Battle is Won 194 



Questions 194 



Bibliography 195 



CHAPTER X 



GRAZING ON WOODLANDS AND ITS RELATION TO 

 THE FUTURE TIMBER SUPPLY 



Results of Investigations 198 



Studies in Northern California, Oregon, and Washington 198 



Studies in Idaho 200 



Extent of Injury 200 



Comparative Seasonal Injury 201 



Damage According to Intensity of Grazing and Amount of 



Forage 201 



Studies in Arizona and New Mexico 202 



Average Injury to Reproduction 202 



Season of Injury 202 



Injury in Relation to Intensity of Grazing and Character and 



Abundance of Forage 203 



