科尔沁沙地差巴嘎蒿(Artemisia halodendron)水分利用特征  

Water use characteristics of typical plant Artemisia halodendron in Horqin Sandy Land

作　　者：贺超 刘廷玺[1,2] 段利民[1,2] 王冠丽[1,2] 郝丽娜 He Chao;Liu Tingxi;Duan Limin;Wang Guanli;Hao Lina(Water Conservancy and Civil Engineering College,2oratory of Protection and Utilization of Water Resources,Inner Mongolia Agricultural University,Hohhot 010018,China;Inner Mongolia Key Laboratory of Protection and Utilization of Water Resources,Inner Mongolia Agricultural University,Hohhot 010018,China)

机构地区：[1]内蒙古农业大学a.水利与土木建筑工程学院,内蒙古呼和浩特010018 [2]内蒙古农业大学内蒙古自治区水资源保护与利用重点实验室,内蒙古呼和浩特010018

出　　处：《中国沙漠》2022年第4期190-198,共9页Journal of Desert Research

基　　金：国家自然科学基金项目(51620105003,51869017);内蒙古自治区自然科学基金项目(2018ZD05,2020JQ06);教育部创新团队发展计划项目(IRT_17R60);科技部重点领域创新团队项目(2015RA4013)。

摘　　要：深入剖析科尔沁沙地固沙植被水分利用特征,可为科尔沁沙地生态修复和区域荒漠化防治提供参考。测定了科尔沁沙地典型固沙植被差巴嘎蒿(Artemisia halodendron)2020年生长季的植物水及其所在区域的地下水、土壤水与降水的δD值,采用多源线性混合模型定量分割了差巴嘎蒿的水分利用来源。结果表明:(1)研究区大气降水方程斜率小于全国大气降水方程,说明该区域大气降水蒸发强烈,方程截距较大,表明研究区水汽再循环强烈。土壤水同位素方程的斜率和截距都小于研究区大气降水方程线,表明土壤水受二次蒸发影响显著。(2)土壤含水率与降雨量、植物生长期的变化有显著的相关关系,受降雨影响,浅层(0—40 cm)土壤含水率波动幅度最大,且土壤含水率随土层深度的增加趋于稳定。(3)雨季,差巴嘎蒿主要利用0—40 cm和120—160 cm层的土壤水,利用率分别为30.1%和25.2%,对其他深度的土壤水利用较少;旱季,主要利用0—80 cm和160—200 cm层的土壤水,利用率分别为30.7%和21.1%,明显高于其他土壤层。In-depth analysis of the water use characteristics of sand-fixing vegetation on sandy land can provide references for ecological restoration of sandy land vegetation and regional desertification prevention and control.This study uses hydrogen and oxygen isotope technology to determine theδD values of plant water in the typical sand-fixing vegetation of Artemisia halodendron and the precipitation,soil water,and groundwater in Horqin Sandy Land during the vegetation growth season in 2020.The multi-source linear mixed model is used to quantitatively segment the water use sources of A.halodendron.The results show that:(1)The slope of the atmospheric precipitation equation in the study area is smaller than the national atmospheric precipitation equation line,indicating that the atmospheric precipitation in this area has strong evaporation and the equation intercept is large,indicating that the water vapor recirculation in the study area is strong.The slope and intercept of the soil water isotope equation line are smaller than the atmospheric precipitation equation line in the study area,indicating that soil water is significantly affected by secondary evaporation.(2)Changes in rainfall and plant growth periods have a clear correlation with soil water content.Affected by rainfall,shallow soil water content has the largest fluctuation range from 0 to 40 cm,and soil water content tends to stabilize with the increase of soil depth.(3)In the rainy season,A.halodendron mainly uses soil water at depths of 0-40 cm and 120-160 cm,with utilization rates of 30.1%and 25.2%,respectively,and uses less soil water in other parts;in dry seasons,0-80 cm is mainly used the utilization rate of soil water with depth of 160-200 cm is 30.7%and 21.1%respectively,which is significantly higher than other soil water.

关 键 词：差巴嘎蒿(Artemisia halodendron) 氢氧稳定同位素 多元线性混合模型 水分来源 科尔沁沙地 

分 类 号：Q948.1[生物学—植物学]