Table 8. Land characteristics, thresholds and degree of suitability for forest and grasslands.

Land characteristics	Forest or grassland	Suitability
		High (S1)	Moderate (S2)	Marginal (S3)	Unsuitable (N)
Slope gradient (°)	Both	≤15	15∼25	25∼35	>35
Soil organic matter (g/kg)	Forest	≥7.97	5.5∼7.97	3.08∼5.5	<3.08
	Grass	≥5.41	3.50∼5.41	1.99∼3.5	<1.99
Total nitrogen (g/kg)	Forest	≥0.19	0.12∼0.19	0.05∼0.12	<0.05
	Grass	≥0.11	0.08∼0.11	0.05∼0.08	<0.05
Available phosphorus (mg/kg)	Forest	≥4.62	3.88∼4.62	3.14∼3.88	<3.14
	Grass	≥3.66	2.52∼3.66	2.46∼2.52	<2.46
Available potassium (mg/kg)	Forest	≥250	150∼250	50∼150	<50
	Grass	≥250	150∼250	50∼150	<50
Bulk density (g/cm3)	Both	-	-	-	>1.65
Soil texture (physical clay content) (%)	Both	15	-	-	>40 or <5
Soil water content (%)	Forest	≥15	11.5∼15	8∼11.5	<8
	Grass	≥4.78	4.14∼4.78	3.50∼4.14	<3.50