A1 层 AI horizon A2 层 A2 horizon ABC 型土 ABC soil AC 型土 AC soil AG 型土 AG soil Ao 层 Ao horizon Ap 层 Ap horizon A 层 A horizon BC 型土壤 B C Soil B 层 B horizon C 层 C horizon G 层 G horizon H 层 H layer L 层 L layer pF 曲线 pF curve pF 值 pF value pH 值 pH Value U 形沟蚀 U-shaped gullying V 式节制坝 V-type check dam V 形沟蚀 V-shaped gulling V 形拖板 V-drag X 线分光分析 X-ray spectrophy X 线绕射分析 X-xayd iffraction method y 次量养分元素， Secondary nutrient element(即 Secondary essential element 安定粒团 Stable aggregate 氨态氮 Ammonieal nitrogen 胺化作用 Aminization 暗 Dark (指 Soil colour 暗渠排水 Closed ditch drainage 暗色火山灰土 Ando soil 白垩土 Chalk soil 白毛微法 Cunninghemella plaque test 斑点 Mottling 半定域土 Semizonal soil 半润度含水量 Moisture content at 50% relative humidity 半沼泽土 Half bog soil (同 Marsh border soil) 榜纹 Streak 剥蚀作用 Exfoliation 保土坝 Soil saving dam
