摘要
本研究依托国家林草局六盘山森林生态定位站,于2019年生长季(5月17日-10月12日)对香水河小流域华北落叶松人工林树干液流进行连续观测,并同步监测气象条件与土壤环境(土壤温度和土壤水分),分析不同天气下华北落叶松树干液流的综合环境响应。结果表明:在日尺度上,华北落叶松树干液流速率呈先升后降的变化趋势,液流速率大小表现为:晴天>阴天>雨天;树干液流速率在晴天呈单峰变化趋势,在阴、雨天均呈多峰变化趋势。晴天的液流启动时间和峰值时间早于阴、雨天,持续时间多于阴、雨天。不同天气树干液流的主导因子存在明显差异,饱和水汽压差是晴天和阴天树干液流的主导因子,其贡献率分别为31.1%和27.4%,而雨天液流的主导因子为太阳辐射,贡献率为40.1%。主成分分析表明,晴天树干液流的综合影响因子为水热复合因子(大气温度、土壤温度、土壤体积含水量)、水汽蒸腾因子(相对湿度、饱和水汽压差)和辐射因子(太阳辐射);阴、雨天树干液流的综合影响因子为蒸腾驱动因子(相对湿度、太阳辐射、饱和水汽压差)、综合热量因子(大气温度、土壤温度)和土壤水分因子(土壤体积含水量)。晴天液流分别滞后于水热复合因子、水汽蒸腾因子和辐射因子110、80和70min到达峰值;阴天和雨天液流分别提前于蒸腾驱动因子、综合热量因子和土壤水分因子10、20、30min和140.60、150min到达峰值。
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 conditions 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 component 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 overcast and rainy days were combined into transpiration(relative humidity,solar radiation,and vapor pressure deficit),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
作者
林雪雯
郭建斌
韩炎穆
付高冉
于澎涛
LIN Xuewen;GUO Jianbin;HAN Yanmu;FU Gaoran;YU Pengtao(College of Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China;Key Laboratory of Forestry Ecology and Environment of National Forestry and Grassland Administration,Research Institute of Forest Ecology,Environment and Protection,Chinese Academy of Forestry,Beijing 100091,China)
出处
《应用生态学报》
CAS
CSCD
北大核心
2024年第8期2063-2072,共10页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目(32271959)
国家重点研发计划项目(2022YFF1300404)
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。
关键词
天气
树干液流
环境影响
时滞效应
weather
sap flow
environmental impact
time lag effect
