摘要
为探究杨树-农作物复合生态系统内水分利用关系,基于稳定碳同位素技术,分析了农田防护林内杨树、冬小麦以及夏玉米水分利用效率(WUE)。结果表明:杨树WUE为5.33~14.88 mmol/mol,不同时期杨树WUE差异显著。小麦WUE为5.79~26.72 mmol/mol,成熟期WUE与同时期杨树间差异显著(P<0.05),但拔节期2者差异不显著;不同时期小麦WUE间差异显著(P<0.01),从大到小为返青期、拔节期、成熟期,但同一时期内不同距离处小麦WUE间差异不显著。玉米WUE为14.56~27.63 mmol/mol,显著高于同时期杨树的该值(P<0.01)。不同时期玉米WUE间差异显著(P<0.01),成熟期玉米WUE显著高于出苗期与拔节期。杨树、小麦和玉米WUE与温度均呈极显著负相关;空气相对湿度与杨树WUE呈显著性正相关,与小麦WUE呈极显著负相关,与玉米WUE相关性不显著。各植物WUE和δ13C值相关密切。杨树对玉米没有明显的水分竞争,对小麦的水分竞争较大,但随着与杨树距离的增大,杨树对小麦的水分竞争变小,小麦的WUE也随之降低。
In order to explore the water use relationship in poplar-crop agroforestry ecosystem,the water use efficiency of Populus,Triticeae Dumort and Zea mays in farmland shelterbelt was analyzed based on stable carbon isotope technology.The results showed that:The WUE of poplar ranged from 5.33~14.88 mmol/mol,which had significant differences in poplar WUE in different periods.The WUE of wheat was 5.79~26.72 mmol/mol,it had significant differences between the WUE at maturity and poplar at the same period(P<0.05),but it had no significant difference between them at the jointing stage.The WUE of wheat was significantly different in various periods(P<0.01),such as returning green stage WUE、jointing stage WUE、maturity stage WUE.However,there was no significant difference in wheat WUE at different distances in the same period.The WUE of maize ranged from 14.56~27.63 mmol/mol,which was significantly higher than that of poplar in the same period(P<0.01).The WUE of maize was dramatically different in different periods(P<0.01),meaning the WUE of maize at the mature stage was totally higher than that at the seedling stage and jointing stage.The WUE of poplar,wheat and maize was negatively correlated with temperature,the air relative humidity had a significant positive correlation with poplar WUE and an extremely significant negative correlation with wheat WUE,and it had no significant correlation with the WUE of maize.The WUE of each plant is closely related to theδ13C value.There was no obvious water competition between poplar and corn,but more water competition between poplar and wheat.However,with the increase of distance from poplar,water competition between poplar and wheat became smaller,and decreased with the WUE of wheat.
作者
连亚妮
杨可伟
牟洪香
李春友
LIAN Yani;YANG Kewei;MU Hongxiang;LI Chunyou(College of Forestry, Hebei Agricultural University, Baoding 071000, China;2College of Landscape Architecture and Tourism, Hebei Agricultural University, Baoding 071000, China)
出处
《林业与生态科学》
2021年第3期229-235,共7页
Forestry and Ecological Sciences
基金
农村领域国家科技计划课题研究任务(2015BAD07B0506)。
