摘要
采用涡度相关系统及其配套微气象设备对2021-2022年辽西地区樟子松人工林进行连续2a的观测,探明樟子松人工林能量流动过程,并揭示环境要素对樟子松人工林能量分配关键参数的影响,为理解陆地植被与气候变化的复杂关系提供参考。结果表明:2021年和2022年,向下长波辐射分别可抵消82%和81%的向上长波辐射,下垫面分别可反射12%和11%的向下短波辐射(S_(d)),向下辐射的20%和21%分别可转化为净辐射(R_(n))。非生长季,土壤热通量(G)和潜热通量(LE)与R_(n)的平均比值分别为-0.20和0.20;生长季,感热通量(H)和LE与R_(n)的平均比值分别为0.57和0.39。在半小时和日时间尺度上,蒸发比(EF)的动态变化基本与波文比相反。2021年生长季,在对日EF产生重要影响的环境要素中,日S_(d)、饱和水汽压差和风速为负作用,而空气湿度(H_(a))、表层土壤含水量(SWC)和归一化植被指数(NDVI)为正作用,其中与SWC的相关系数最大;但2022年生长季日EF的主控因子为日S_(d)、空气温度、H_(a)、SWC和NDVI,且均为正相关,其中与NDVI的相关系数最大。辽西地区樟子松人工林G为非生长季重要能量来源,H为生长季主要能量耗散项,水分供应和植被生长共同主导该林的能量分配。
Eddy covariance method and corresponding meteorological system were used to observe a Pinus sylvestris var.mongolica plantation in the western Liaoning province,to ascertain the process of energy flow,to reveal the relationship between the key parameters of energy partitioning and environmental factors in two years,and finally to provide support for a deep understanding of the complex relationship between terrestrial vegetation and climate change.In 2021 and 2022,downward longwave radiation offset 82%and 81%of upward longwave radiation,12%and 11%of downward shortwave radiation(S_(d))was reflected back to the atmosphere by the land surface,20%and 21%of downward radiation was transformed into net radiation(R_(n)),respectively.In the non-growing season,the average ratio of soil heat flux(G)and latent heat flux(LE)to R_(n) were-0.20 and 0.20,respectively.In the growing season,the average ratio of sensible heat flux(H)and LE to R_(n) were 0.57 and 0.39,respectively.At half-hour and daily time scales,the general trend of evaporative fraction(EF)was contrary to that of Bowen ratio.Among the environmental factors that obviously influenced daily EF during the growing season of 2021,daily S_(d),vapor pressure deficit and wind speed were negative effect,daily air relative humidity(H_(a)),top soil water content(SWC),and normalized difference vegetation index(NDVI)were positive effect,and the correlation coefficient between daily EF and SWC was highest.The important controlling factors of daily EF during the growing season of 2022 were daily S_(d),air temperature,H_(a),SWC and NDVI,all of those factors were positive effect,and the correlation coefficient of NDVI was highest.In the Pinus sylvestris var.mongolica plantation of the western Liaoning province,G was an important energy source during the non-growing season,H was the main energy consumption during the growing season,and water supply and vegetation growth dominated the energy partitioning in this plantation.
作者
高翔
裴松义
蔡金峰
黄辉
张劲松
GAO Xiang;PEI Song-yi;CAI Jin-feng;HUANG Hui;ZHANG Jin-song(Key Laboratory of Tree Breeding and Cultivation,National Forestry and Grassland Administration,Research Institute of Forestry,Chinese Academy of Forestry,Beijing 100091,China;Collaborative Innovation Center of Sustainable Forestry in Southern China,Nanjing Forest University,Nanjing 210037;Henan Xiaolangdi Forest Ecosystem National Observation and Research Station,Jiyuan 454650;State-owned Jianping County Heishui Mechanized Forest Farm,Chaoyang 122000)
出处
《中国农业气象》
2025年第10期1425-1437,共13页
Chinese Journal of Agrometeorology
基金
国家自然科学基金项目“干旱事件对辽西樟子松人工林碳收支过程的影响及其机制”(32301662)。
关键词
樟子松人工林
能量分配
蒸发比
波文比
Pinus sylvestris var.mongolica plantation
Energy partitioning
Evaporative fraction
Bowen ratio
