不同生育阶段咸水滴灌对红枣根区土壤有机碳垂直分布特性的影响  

Vertical Distribution of Soil Organic Carbon Content in Rhizosphere of Jujube at Its Different Growth Stages under Drip Irrigation with Salty Water

作　　者：王成[1] 李宁[2] 王兴鹏[1] 张军[1] 姜倩[1] 王亮[1] 

机构地区：[1]塔里木大学水利与建筑工程学院,新疆阿拉尔843300 [2]新疆生产建设兵团灌溉中心试验站,新疆乌鲁木齐830002

出　　处：《干旱区研究》2012年第5期883-889,共7页Arid Zone Research

基　　金：国家自然科学基金项目(31060084);水利部公益性行业项目(201101050)

摘　　要：为探索咸水滴灌对红枣根区土壤有机碳含量的影响,采用大田咸水滴灌试验,在不同的灌水定额和咸水矿化度条件下,对红枣不同生育阶段根区土壤有机碳的影响进行分析。结果表明:不同矿化度的咸水滴灌处理后,不同生育阶段红枣根区土壤有机碳,随着土层深度的增加呈"S"形变化,影响土壤有机碳的咸水矿化度依次为:3g/L>4 g/L>淡水对照>2 g/L,表层10～30 cm的土壤有机碳含量较30～50 cm处高,而30～40 cm土层的有机碳含量相对最小。当矿化度一定时,影响红枣根区土壤有机碳含量的灌水定额依次为:30 L>20 L>10 L,说明在利用咸水灌溉时,适度增加灌水量是弱化盐分对土壤有机碳产生影响的有效途径。相对于其他处理,灌水定额为30 L,矿化度为2 g/L的咸水滴灌在促进枣树根系对土壤有机碳利用方面的影响最显著。In this paper, the effect of drip irrigation with salty water on soil organic carbon content in rhizosphere of jujube at its different growth stages was explored based on the experiment of field drip irrigation with salty water under different irrigation quotas and different salinity levels of irrigation water. The results showed that the soil or-ganic carbon content varied with soil depth, salinity level of irrigation water and irrigation quotas, and its curve was S-shaped. The salinity affecting soil organic carbon content was in an order of 3 g/L 〉 4 g/L 〉 freshwater 〉 2 g/L, organic carbon content in topsoil 10-30 cm in depth was higher than that in soil layer of 30-50 em, but the or-ganic carbon content in soil layer of 30 - 40 cm was relatively low. When the salinity of irrigation water was con-stant, the effect of irrigating quota on soil organic carbon content was in an order of 30 L 〉 20 L 〉 10 L, which indi-cated that an appropriate increase of irrigating quota was an effective way of soil desalination when jujube was irriga-ted with salty water. Compared with other treatments, drip irrigating quota of 30 L and 2 g/L-salinity of irrigation salty water could significantly promote the utilization of soil organic carbon in rhizosphere of jujube.

关 键 词：咸水滴灌 红枣根区 土壤有机碳 阿拉尔 新疆 

分 类 号：S153.6[农业科学—土壤学]