摘要
采用热扩散探针法,于2021年5—10月对库布齐沙漠小叶杨(Populus simonii)和新疆杨(Populus alba var.pyramidalis)树干液流进行观测,在生长季同步监测其气象因子、土壤水分等指标,分析小时、日和月尺度下树干液流对环境因子(空气温度、相对湿度、饱和水汽压差、太阳辐射、风速、土壤含水量、降雨量)的响应关系。研究结果如下:(1)新疆杨总耗水量(1059.43 kg)高于小叶杨(947.30 kg)。(2)小时尺度上,小叶杨和新疆杨液流速率均与空气温度、相对湿度、饱和水汽压差、太阳辐射、风速、土壤含水量和降雨量等7个环境因子呈极显著相关;日尺度上,两树种液流速率均与空气温度、相对湿度、饱和水汽压差、太阳辐射、风速和土壤含水量等6个环境因子呈极显著相关;月尺度上,小叶杨液流速率与饱和水汽压差、太阳辐射和土壤含水量呈极显著相关,新疆杨液流速率与空气温度、饱和水汽压差和太阳辐射呈极显著相关。(3)建立时间尺度树干液流与环境因子的关系,小时尺度上,小叶杨入选因子依次为空气温度、土壤含水量、饱和水汽压差和太阳辐射,新疆杨入选因子包括太阳辐射、空气温度等7个因子,树干液流的解释率分别为74.9%、75.6%;日尺度上,小叶杨入选因子依次为土壤含水量、空气温度和风速,新疆杨入选因子包括太阳辐射、空气温度、土壤含水量和风速,树干液流的解释率分别为84.3%、80.9%;月尺度上,太阳辐射和风速是小叶杨液流速率的主要影响因子,2个因子可以共同解释小叶杨液流速率变化的99.5%,饱和水汽压差对新疆杨液流速率的影响最大,单独能够解释新疆杨液流速率变化的91.8%。(4)在较小时间尺度上(小时),液流适宜采用仪器直接测定,在大时间尺度上(日、月)可监测环境因子来估算出2个树种的蒸腾耗水量。
This study employed the thermal diffusion probe method to observe the sap flow of Populus simonii and Populus alba var.pyramidalis in the Kubuqi Desert from May to October 2021.Meteorological factors and soil moisture were synchronously monitored during the growing season to analyze the response relationship between sap flow and environmental factors(air temperature,relative humidity,vapor pressure deficit,solar radiation,wind speed,soil water content,and precipitation)at hourly,daily,and monthly scales.The results showed that:(1)The total water consumption of P.alba var.pyramidalis(1059.43 kg)was higher than that of P.simonii(947.30 kg).(2)On the hourly scale,the sap flow velocity of P.simonii and P.alba var.pyramidalis were highly significant correlations with seven environmental factors,including air temperature,relative humidity,vapor pressure deficit,solar radiation,wind speed,soil water content,and precipitation.On the daily scale,the sap flow velocity of two species were highly significant correlations with six environmental factors,including air temperature,relative humidity,vapor pressure deficit,solar radiation,wind speed,and soil water content.On the monthly scale,the sap flow velocity of P.simonii was highly and significantly correlated with vapor pressure deficit,solar radiation,and soil water content,while that of P.alba var.pyramidalis was highly and significantly correlated with vapor pressure deficit,solar radiation,and soil water content.(3)The relationship between sap flow and environmental factors was established at different temporal scales.On the hourly scale,the selected factors for P.simonii were air temperature,soil water content,vapor pressure deficit and wind speed,with explanatory rate of 74.9%.For P.alba var.pyramidalis,the selected factors included solar radiation and air temperature,etc.,with explanatory rate of 75.6%.On the daily scale,the selected factors for P.simonii were soil water content,air temperature,and wind speed,with explanatory rate of 84.3%.For P.alba var.pyramidalis,the selected factors included solar radiation,air temperature,soil water content,and wind speed,with explanatory rate of 80.9%.On the monthly scale,solar radiation and wind speed were the main influencing factors for the sap flow velocity of P.simonii,jointly explaining 99.5%of the variation.Vapor pressure deficit had the greatest impact on the sap flow velocity of P.alba var.pyramidalis,explaining 91.8%of the variation alone.(4)At smaller temporal scale(hourly),sap flow could be directly measured using instruments.While at larger temporal scales(daily and monthly),environmental factors could be monitored to estimate transpiration water consumption for both tree species.
作者
钟红云
潘瑞华
邸楠
包铁军
佘昊
臧文赫
李琼
ZHONG Hongyun;PAN Ruihua;DI Nan;BAO Tiejun;SHE Hao;ZANG Wenhe;LI Qiong(School of Ecology and Environment,Inner Mongolia University,Hohhot 010070,China;Key Laboratory of Ecology and Resource Use of the Mongolian Plateau of the Ministry of Education,Hohhot 010070,China;Inner Mongolia Key Laboratory of Grassland Ecology,Hohhot 010070,China)
出处
《生态学报》
CAS
CSCD
北大核心
2024年第21期9896-9909,共14页
Acta Ecologica Sinica
基金
国家自然科学基金(32060242)
内蒙古自然科学基金(2019BS03008)。
关键词
树干液流
时间尺度
小叶杨
新疆杨
库布齐沙漠
stem sap flow
temporal scale
Populus simonii
Populus alba var.pyramidalis
Kubuqi Desert
作者简介
通讯作者:潘瑞华.E⁃mail:panruihuaxiaonei@126.com。
