穴播地膜小麦土壤水分动态变化研究  

Studies on the dynamic change of soil water of dibbling wheat in film-mulched field

作　　者：张保军[1] 杨文平[1] 王银银[1] 

机构地区：[1]西北农林科技大学农学院,陕西杨陵712100

出　　处：《西北农林科技大学学报（自然科学版）》2001年第4期70-73,共4页Journal of Northwest A&F University(Natural Science Edition)

基　　金：国家"九五"攻关项目 ( 96 -0 0 4-0 5 -0 7( A) )

摘　　要：对地膜冬小麦不同生育时期和不同深度土壤含水量测定结果表明 ,在冬小麦越冬期 ,不同深度土壤含水量地膜小麦明显大于露地小麦 ;在返青期和拔节期 ,40～ 6 0 cm以上土层土壤含水量地膜小麦略大于露地小麦 ;孕穗期 ,土壤含水量地膜小麦小于露地小麦。随着生育期延后 ,不同深度土壤含水量地膜小麦多数表现为降低的趋势 ,而露地小麦在 0～ 2 0 cm和 2 0～ 40 cm土层以上土壤含水量变化有波动 ,40～ 6 0 cm以下土层均表现为近似抛物线形。这种规律性变化与覆地膜后引起土壤水分动态运动及外界降水有关。土层内平均土壤含水量 ,地膜小麦较露地小麦增加值随生育期延后呈由高到低规律性变化。Due to the different development stages and soil depth,the soil water content of dibbling wheat in film mulched field (DM) and nonfilm mulched field (LD)was obviously different.The soil water content of DM was obviously larger than the soil water content of LD at the winter development stage,but the soil water content of DM was less than the soil water content of LD at booting stage.The soil water content at different depth of soil was reduced,as the wheat development stage was delayed.the soil water content of LD was obviously affected by rainfall and soil water shifting.The dynamic change of added average soil water content of DM was lower than that of LD.

关 键 词：地膜小麦 土壤含水量 动态变化 生育期 土层深度 

分 类 号：S512.104.8[农业科学—作物学]