文献类型：期刊文献

中文题名：乌兰布和沙漠梭梭(Haloxylon ammodendron)夜间液流特征及其环境驱动机制

英文题名：The characteristics of branch nocturnal sap flow and its environmental driving mechanism of Haloxylon ammodendron artificial shrub in the Ulan Buh Desert

作者：刘雅莉[1,2] 白建华[1,2] 熊伟[1,2] 韩雨晴[1,2] 廉泓林[5] 郭浩[1,2] 辛智鸣[3,4] 刘湘杰[3,4] 刘怀远[3,4]

第一作者：刘雅莉

机构：[1]中国林业科学研究院生态保护与修复研究所,北京100091;[2]中国林业科学研究院荒漠化研究所,北京100091;[3]中国林业科学研究院沙漠林业实验中心,北京100091;[4]中国林业科学研究院内蒙古磴口荒漠生态系统定位研究站,北京100091;[5]科尔沁左翼中旗水务局,内蒙古科尔沁左翼中旗029300

年份：2022

卷号：42

期号：5

起止页码：195-203

中文期刊名：中国沙漠

外文期刊名：Journal of Desert Research

收录：CSTPCD;;北大核心:【北大核心2020】；CSCD:【CSCD2021_2022】；

基金：国家自然科学基金项目(31971724);内蒙古自治区科技重大专项(2019ZD00301-02)。

语种：中文

中文关键词：乌兰布和沙漠;夜间液流;热扩散茎流仪;环境因子;相对土壤含水量

外文关键词：Ulan Buh Desert;nocturnal sap flux;thermal dissipation probe;environmental factors;relative extractable soil water(REW)

分类号：Q945.79

摘要：树木夜间液流(Qn)指夜晚通过根、茎、叶等器官的液流量,对于研究树体内水分的运移、存储以及叶片蒸腾等具有重要的生理生态学意义。本研究于2020年6-10月,应用Granier热扩散探针法测定了乌兰布和沙漠梭梭(Haloxylon ammodendron)人工灌丛枝条的液流,同步监测了大气温度(T)、相对湿度(RH)、降水量(P)、风速(WS)和土壤水分等环境因子,分析了梭梭夜间液流特征及其对环境因子的响应。结果表明:(1)梭梭灌丛枝条液流密度呈现出明显的昼夜变化规律;白天梭梭液流密度(SFD)呈现出“单峰型”或“双峰型”曲线,值为0.03-0.18 g·cm^(-2)·min^(-1);夜间SFD的变幅较小,为0.04-0.08 g·cm^(-2)·min^(-1)。(2)在6、7、8、9、10月,梭梭灌丛Qn分别为0.57±0.38、0.51±0.37、0.50±0.34、0.55±0.32、0.37±0.18 kg·d^(-1),分别占日液流通量的23.29%、24.07%、26.76%、31.26%、30.27%,说明Qn是估计梭梭灌丛日蒸腾耗水量的重要组成部分。(3)Qn与T、WS和饱和水汽压差(VPD)正相关(P<0.05),而与RH负相关(P<0.05),其中VPD与Qn的相关性最大。(4)在日尺度上,Qn与相对土壤含水量(REW)正相关(P<0.05),说明Qn随着土壤水分有效性的提高而增大。
Nocturnal sap flow(Qn)refers to the sap flux through roots,stems and leaves during the nighttime,which has an eco-physiologically significance for understanding trunk water transport,storage and canopy transpiration of the trees. In this study,the Granier’s thermal diffusion probe was used to measure the sap flow of Haloxylon ammodendron,a common sand-fixing shrub species in the Ulan Buh Desert. Combined the simultaneous monitoring of meteorological factors including atmospheric temperature(T),relative air humidity(RH),rainfall(P),and wind speed(WS),as well as soil moisture,the underlying mechanism of environmental driver of sap flow of this species was analyzed from June to October 2020. The results showed that:(1)The sap flux density(SFD)showed an cycled daily variation. Specifically,the pattern of SFD showed a "unimodal" or "bimodal" curve in the daytime,it changed from 0.03 to 0.18 g·cm^(-2)·min^(-1),while the SFD changed stably and were a relatively low ranged from 0.04 to 0.08 g·cm^(-2)·min^(-1)at nighttime.(2)The average of Qnwere 0.57±0.38,0.51±0.37,0.50±0.34,0.55±0.32,and 0.37±0.18 kg·d^(-1),respectively,from June to October;which accounted for23.29%,24.07%,26.76%,31.26%,and 30.27% of daily sap flow,respectively,suggesting that nocturnal sap flow is an essential components of daily water use of H. ammodendron shrub.(3)The Qnwas positively correlated with T,WS and VPD(P<0.05),while it was negatively correlated with RH(P<0.05).(4)Qnincreased with increasing relative extractable soil water(REW)during the study period(P<0.05). Our results will be benefit to accurately estimate daily water use of H. ammodendron shrub and provides a theoretical basis for the rational management of artificial forests in the Ulan Buh Desert.