滴灌条件下成龄核桃根系空间分布特征和模型研究  

Study on the spatial distribution characteristics and models of the roots of mature walnut under drip irrigation

作　　者：焦萍 虎胆·吐马尔白[1] 米力夏提·米那多拉 JIAO Ping;Hudan·Tumarbai;Milixiati·Minadola(College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China)

机构地区：[1]新疆农业大学水利与土木工程学院,新疆乌鲁木齐830052

出　　处：《干旱地区农业研究》2020年第5期116-122,共7页Agricultural Research in the Arid Areas

基　　金：国家重点实验室资助项目(2018nkms02);塔里木河流域阿克苏管理局资助项目(TGJAKSSKS2019001);河海大学国家重点实验室基金(2016490511);国家自然科学基金(51469033)。

摘　　要：以阿克苏地区进行地表滴灌的成龄核桃树为研究对象,基于Hydrus 1D软件进行地表滴灌条件下的4种一维根系密度分布函数(实测根系数据模型、指数分布模型、线性分布模型和分段分布模型)进行土壤水分数值模拟研究。结果表明:根系行方向浅层(0~40 cm土层)、中层(50~80 cm土层)、深层(>90 cm)分布差异性极显著(P<0.01),株方向差异性显著(P<0.05)。滴灌条件下,核桃树根系分布主要位于浅层土壤区(0~40 cm),是根系主要吸水部位,占比65%~73%。指数分布模型、线性分布模型和分段分布模型精度均较高,误差在4%范围内;在根系数据缺失条件下,推荐使用线性分布函数和分段分布函数来模拟根系分布。Based on the Hydrus 1D software,four kinds of one-dimensional root density distribution functions(measured root data model,exponential distribution model,linear distribution model,and subsection distribution model)under the condition of surface drip irrigation were carried out for numerical simulation of soil moisture.The results showed that there were significant differences of the row direction in the distribution of roots in shallow(0~40 cm),middle(50~80 cm),deep(>90 cm)(P<0.01),and plant direction(P<0.05).Under the condition of drip irrigation,the root system of walnut was mainly located in the shallow soil layer(0~40 cm),which was the main part of water absorption,accounting for 65%~73%.The accuracy of exponential distribution model,linear distribution model,and segmented distribution model were all high,and the error was within 4%.Because of the difficulty of model parameter measurement,it was recommended to use linear distribution function and segmented distribution function to simulate root distribution under the condition of lack of root data.

关 键 词：滴灌 核桃树 根系分布 数值模拟 模型构建 

分 类 号：S664.1[农业科学—果树学] S275.6[农业科学—园艺学]