不同土体构型土壤的持水性能

通过GMS软件三维建模功能,将宁夏某葡萄基地土壤划分为4种土体构型:壤砂型、砂型、壤砂粘型和壤粘砂型结构,并对基地土壤的田间持水量、饱和导水率和容重进行了分析,研究了不同土体构型下的土壤持水性能。结果表明,土壤土体构型不同,其容重、田间持水量、土壤饱和导水率也不同。砂型结构的田间持水量和容重最小,分别为13%和1.5 g·cm~(-3),而土壤饱和导水率最大,为3.2 m·d~(-1);壤粘砂型结构田间持水量和容重最大,分别为16.5%和1.63 g·cm~(-3),而土壤饱和导水率最小,为1.02 m·d~(-1);田间持水量与土壤饱和导水率的相关系数为-0.92,呈显著负相关,与容重的相关系数为0.73,呈显著正相关。壤粘砂型土体构型上壤下粘,利于保水保肥,持水性能最好;砂型结构持水性能最差,其他土体构型持水性能一般,需要进行改良以提高土壤的持水性能。

Soil water-holding properties of different soil body configuration

Through GMS software 3D modeling capabilities ,one grape base soil configuration in Ningxia was divided into four categories :loam-sand ,sand ,loam-sand-clay and loam-clay-sand type .It analyzed the features of field capaci-ty ,saturated hydraulic conductivity and bulk density , and studied the soil water-holding performance on different soil body configuration .The results showed that different soil configuration had different bulk density ,field capacity and soil saturated hydraulic conductivity .The sand soil configuration had the lowest field capacity (13% ) and bulk density (1 .5 g·cm-3 ) ,but the highest soil saturated hydraulic conductivity (3 .2 m·d-1 ) .On the contrary ,the loam-clay-sand con-figuration had the highest field capacity (16 .5% ) and bulk density (1 .63 g · cm-3 ) , but the lowest soil saturated hy-draulic conductivity (1 .02 m·d-1 ) .Field capacity has negative correlation with soil saturated hydraulic conductivity (-0 .92 ) ,but it was positively related with bulk density (0 .73 ) ,among the four soil body configurations ,the loam-clay-sand type had the best soil water-holding performance ,sand type was the worst ,and the other types had the general con-figuration ,which need to be modified in order to improve the soil water-holding performance .