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水分是干旱、半干旱地区植被建设中最重要的生态因子,而在西部干旱地区农业灌溉中,存在水资源有效利用率低、浪费严重的问题。对比分析了风沙区有、无灌溉情况下的土壤水分,结果表明:灌溉地和非灌溉地剖面内土壤水分变异系数随着土层深度的增加均呈现出降低的趋势。灌溉只对0-60 cm土壤水分有影响。4-10月灌溉和非灌溉紫花苜蓿地0-20 cm层土壤含水量呈多“W”型,20-60 cm层土壤含水量大致呈“V”型,60-100 cm层土壤含水量为平稳型,0-1m土层储水量的变化呈“V”型。土壤水分季节动态变化可划分为3个时期:土壤水分消耗期(5-6月);土壤水分积累期(7-9月);土壤水分稳定期(10月至次年4月)。灌溉制度还有待进一步研究。
Moisture is the most important ecological factor in vegetation construction in arid and semi-arid areas. However, in agricultural irrigation in the arid areas of western China, water use efficiency is low and waste is serious. The results showed that the coefficient of variation of soil moisture in both irrigated and non-irrigated landforms showed a decreasing trend with the increase of soil depth. Irrigation has an effect on 0-60 cm soil moisture only. Soil moisture in 0-20 cm layer in Alfalfa irrigation and non-irrigation from April to October was mostly “W”, soil moisture content in 20-60 cm layer was approximately “V”, 60-100 cm The soil water content is stable, and the change of water storage in 0-1m soil layer is “V”. The seasonal dynamic changes of soil moisture can be divided into three periods: soil water consumption period (May-June); soil water accumulation period (July-September); soil moisture stability period (October to April). Irrigation system remains to be further studied.