摘要
本文以定位观测数据，应用空气动力学原理，探讨了杉木人工林生态系统乱流热量的交换规律。结果表明：每年冠层向邻近空间扩散的热量８３１０５×１０８Ｊ／ｈｍ２；邻近空间传递给冠层的热量２０１９０×１０８Ｊ／ｈｍ２；林下空间输送给地表层的热量１０９６×１０８Ｊ／ｈｍ２；地表层传送给林下空间热量有５８４×１０８Ｊ／ｈｍ２。乱流热量交换的大小，主要由辐射能和湍流扩散强度决定。在热量的交换中，林冠层起着直接的热源和桥梁作用。由于冠层对辐射的截留，对动能的削弱，使得冠层和地表层空间的乱流热量大小和交换方向极不相同。
On the basis of the data collected from observations in 8 years, acording to the principle of turbulent the basic characteristics of turbulent exchange thermal in a Chinese fir plantation was studied.Results showed that the annual transportation thermal is 83105×10 8J/hm 2 from crown to neighour speces ,the annual transmissive thermal is 20190×10 8J/hm 2 from to crown.There are 584×10 8J/hm 2 from space of close by ground to be transmit to chearlng,sametime the chearing transports 1096×10 8J/hm 2 thermal to the space of close by ground.The size of the turbulent flow exchange thermal is depend by the radiation energy and turbulent flow diffusivity.The canopy is a heat souce or bridge in exchange of thermal.
出处
《农业现代化研究》
CSCD
北大核心
1998年第3期178-182,共5页
Research of Agricultural Modernization
关键词
杉木人工林
热传递
乱流交换
净辐射
Chinese fir plantation,thermal transmission,turbulent flow exchange, net radiation.
