文献类型：期刊文献

中文题名：不同土壤水分条件下杉木种源树干液流特征对气象因子的响应

英文题名：Responses of sap flow characteristics under different Chinese fir provenances to meteorological factors under different soil moisture conditions

作者：许庭毓[1,2,3] 牛香[1,2,3] 王兵[1,2,3] 宋庆丰[1,2,3] 王南[1,2,3] 孙建军[4] 刘儒[4]

第一作者：许庭毓

机构：[1]中国林业科学研究院森林生态环境与自然保护研究所,北京100091;[2]国家林业和草原局森林生态环境重点实验室,北京100091;[3]江西大岗山森林生态系统国家野外科学观测研究站,江西分宜336606;[4]中国林业科学研究院亚热带林业实验中心,江西新余336600

年份：2023

卷号：21

期号：5

起止页码：99-105

中文期刊名：中国水土保持科学

外文期刊名：Science of Soil and Water Conservation

收录：CSTPCD;;Scopus;北大核心:【北大核心2020】；CSCD:【CSCD_E2023_2024】；

基金：中央级公益性科研院所基本科研业务费专项“大岗山杉木种源林水文功能性状与水分利用效率研究”(CAFYBB2020ZE003);江西大岗山森林生态系统国家野外科学观测研究站(2060503-20-201)。

语种：中文

中文关键词：杉木种源;液流密度;土壤含水量;气象因子;大岗山地区

外文关键词：Chinese fir provenance;sap flow density;soil moisture content;meteorological factors;Dagangshan area

分类号：S718.5

摘要：为研究不同种源杉木(Cuninghamia lanceolata)树干液流变化对不同土壤水分条件及气象因子的响应差异。在2021年3月初—7月末,运用Granier热扩散边材树干液流探针对杉木进行树干液流观测,通过AZS 100TDR土壤水分仪测量土壤水分的动态,并同步监测总辐射、空气温度、空气相对湿度、降雨量等气象因子,采用饱和指数曲线分别对液流密度、总辐射和空气水汽压亏缺进行拟合,分析大岗山不同种源杉木树干液流特征对气象因子及土壤水分动态的响应。结果表明:不同杉木种源树干液流日变化随总辐射和空气水汽压亏缺呈现明显的昼高夜低的变化规律,且差异显著(P<0.01),其中来自江西铜鼓的种源树干液流密度最高。土壤含水量相对充足时期(RSP)树干液流密度峰值高于土壤含水量相对亏缺时期(RDP),来自江西修水的种源在2种水分条件下液流密度变化幅度最小且液流密度最低,适合在水分条件差的区域种植。不同种源树干液流密度在2个时期对气象因子的拟合方程表明,在RSP液流密度上升的速率高于RDP,RSP影响树干液流的主要因子是饱和水汽压差,RDP饱和水汽压差影响树干液流的因子是总辐射。该研究揭示不同种源的抗旱特性及对干旱的响应机制,可为我国南方不同地区杉木人工林的可持续经营和林地水资源的有效管理提供科学参考。
[Background]Chinese fir is a common afforestation tree species in southern China.Under the background of climate change,droughts frequently occur.Studying the water transfer process of forest trees under special weather conditions can provide a basis for predicting the characteristics of transpiration water consumption in future scenarios.[Methods]We used the Granier thermal diffusion sap flow probe(TDP)to observe the sap flow of Chinese fir from March to July,and the soil moisture dynamics were measured by the AZS 100TDR,the meteorological factors such as the solar radiation,air temperature,relative air humidity,and rainfall were simultaneously observed.The saturation index curve was used to respectively fit the sap flow density,solar radiation and air vapor pressure deficit to analyze the influence of the sap flow characteristics of different provenances of Chinese fir in Dagangshan on the meteorological factors and the response of soil moisture dynamics.[Results]1)The diurnal changes of sap flow of different Chinese fir provenances showed obvious changes in day and night with solar radiation and air vapor pressure deficit,and the difference was significant(P<0.01).Among them,the sap flow density of the provenance from Jiangxi Tonggu was the highest.The peak sap flow density during the period of sufficient soil moisture(RSP)was higher than that during the period of soil moisture deficit(RDP).The provenance from Xiushui,Jiangxi had the smallest change in sap flow density under the two moisture conditions with the lowest sap flow density,which is suitable to plant in poor moisture conditions.2)The fitting equations of sap flow density of different provenances to meteorological factors in the two periods showed that the rate of increase of sap flow density in the RSP period was higher than that in the RDP period.The main factor affecting sap flow during the RSP was vapor pressure deficit,and solar radiation in RDP.[Conclusions]Soil moisture conditions,meteorological factors,and provenance origin will all affect the sap flow density of fir tree trunks,and different provenances have different sensitivities to different factors.This study reveals the drought resistance characteristics of different provenances and the response mechanism to drought,aiming to provide a scientific basis for the sustainable management of fir plantations and the effective management of forest water resources in different regions of southern China.