应用生态学报2024，Vol.35Issue(8)：2063-2072,10.DOI:10.13287/j.1001-9332.202408.004
不同天气下华北落叶松树干液流对环境的响应
Responses of sap flow in Larix principis-rupprechtii to environment under different weather conditions
摘要
Abstract
This study was conducted in Liupanshan Forest Ecological Positioning Station of the National Forestry and Grassland Administration.We monitored sap flow of Larix principis-rupprechtii plantation in the Xiangshui River sub-basin throughout the 2019 growing season(from May 17 to October 12),as well as the meteorological condi-tions and soil environment(soil temperature and soil water content),to analyze the comprehensive environmental responses of sap flow in L.principis-rupprechtii under different weather conditions.The results showed that sap flow rate increased and then decreased on the daily scale,with the highest rate on sunny days,followed by overcast days and then rainy days.Sap flow rate had a single peak on sunny days and multiple peaks on overcast and rainy days.Sunny days had earlier and longer sap flow compared to overcast and rainy days.Dominant factors driving sap flow differed across different weather.Vapor pressure deficit was the dominant factor influencing sap flow in sunny and overcast days,while solar radiation was dominant one in rainy days.The contribution rates of main factors to sap flow on sunny,overcast and rainy days were 31.1％,27.4％and 40.1％,respectively.Results of the principal com-ponent analysis showed the factors affecting sap flow on sunny days could be classified into hydrothermal complex factors(air temperature,soil temperature,and volumetric soil moisture),water vapor transpiration factors(relative humidity and vapor pressure deficit),and radiation factor(solar radiation).The factors affecting sap flow on over-cast and rainy days were combined into transpiration(relative humidity,solar radiation,and vapor pressure defi-cit),heat(air temperature and soil temperature),and soil water factor volumetric(volumetric soil moisture).On sunny days,sap flow reached the peak value 110,80,70 min after the hydrothermal,water vapor transpiration,and radiation factors,respectively.On overcast and rainy days,sap flow reached its peak in 10,20,30 min and 140,60,150 min,respectively before the peaks of transpiration,heat,and soil water factors.关键词
天气/树干液流/环境影响/时滞效应Key words
weather/sap flow/environmental impact/time lag effect引用本文复制引用
林雪雯,郭建斌,韩炎穆,付高冉,于澎涛..不同天气下华北落叶松树干液流对环境的响应[J].应用生态学报,2024,35(8):2063-2072,10.基金项目
本文由国家自然科学基金项目(32271959)、国家重点研发计划项目(2022YFF1300404)和交通运输部公路科学研究所"公路交通环境保护技术交通运输行业重点实验室开放课题"(2020HXFWSBXY027)资助. （32271959）
