兰州地区砂田土壤的水分特征  

Soil Moisture Behaviours in Pebble-Mulched Fields in Lanzhou Area

作　　者：王天送[1] 苏贺昌 杨世维 

机构地区：[1]西北师范大学

出　　处：《干旱地区农业研究》1991年第1期66-69,共4页Agricultural Research in the Arid Areas

摘　　要：1983年至1984年18个月在兰州皋兰县定点取样,烘干测定的砂田土壤的水分含量数据,并与同期以同样方法测定的一般土田土壤的含水量进行了比较,砂田土壤的水分特征:(1)平均含水量 砂田土壤比一般土壤高出2%左右;(2)逐层比较 砂田土壤耕作层(0—20cm)的含水量与一般土壤表层含水量之差异最大,往下差异逐层减小;(3)季节变化 砂田土壤水分含量的最大值出现于6月,7月中旬以后急剧下降,而一般土壤的高峰出现在5月,6月中旬以后急减,即砂田土壤水分滞后一个月。In 18 months from 1983 to 1984,soil samples were-taken at the fixed positions inGaolan county,Lanzhou.Also,soil moisture content data from dried,samples inpebble-mulched fields were compared with those from samples taken by the Same proce-dures at the same time in the common fields.Soil moisture behaviours in pebble-mulchedfields are as follows:(1)average moisture content in pebble-mulched fields Was 2% or sohigher than that in the common soil:(2)in comparison with layer by layer,soil moisturecontent in the tilth layer(0—20cm)of pebble-mulched fields was greatly different from thatin the common soil layer,and the deeper the soil layer,the smaller the difference became:and(3)As far as the seasonal change in soil moisture content is concerned,the maximumvalue of soil moisture content in pebble-mulched fields occured in June,but after the mid-die of July,it dropped drastically,while the peak value of soil moisture content in the com-mon fields was in May,but after the middle of June,it was reduced greatly,that is,soilmoisture content in pebble-mulched fields had a one month delay.

关 键 词：土壤 水分 砂田 动态 兰州市 

分 类 号：S152.7[农业科学—土壤学]