摘要
本文研究了四川盆地几种典型退化紫色土的基本物理特性及对其蚀、旱等肥力退化(?)征的影响。研究指出,退化紫色土的粗骨颗粒(>10μm)占52.00%～69.97%;粗微结构体(>10μm占72.29%～82.54%,而结构系数却较低;粗孔隙(>10μm)占32.21%～38.15%;在各吸力下土壤持水量均较低;土壤蒸发达到平衡时的历时较短等特性部是影响紫色土易蚀、易旱的重要原因采用侵蚀度、水容量和失水比评价其易蚀、易旱性看出:各类典型紫色土退化较重,沙溪庙组饱和(?)紫色土则退化较轻。
This paper deals with both the basic physical properties and their influence on fertile degradation chara- tristics of several types of degradated purple soils in Sichuan Basin.The results reveal that in the regradated purple soils there are skeleton grain(>10μm)occupied 52.00—69.79% and coarse microstructural bodies (>10μm)occupied 72.29—82.54%,but lower structural indexes,coarse pore space(>10μm)occupied 32.21—38.15% and lower soil moisture retention in each range of soil moisture suction,shorter time which it lasts for soil evaporation to reach the balance point. All above are the important reasons causing purple soils to become easy to dry and to erode.Whether the purple soils are liable to erode and to dry have been evaluated according to their erodibility,moisture capasity and lost-moisture ratio.The result is that purple soils are seriously degradated except Saximiao Group(J_(?)) Calcareous Purple Soil.
基金
四川省科委基础研究专项经费资助
关键词
土壤退化
物理特性
四川盆地
Sichuan Basin
physical property
soil moisture
soil evaporation
