[Simulation of crown leaf area index of Korean pine and broadleaved mixed forest in Chang-Bai mountains].
Based on the 3-year successive automatic measurement of photosynthetic active radiation above and under the crown of Korean pine and broadleaved mixed forest in Changbai Mountains, as well as the seasonal observation on leaf area index, a semi-empirical model was established to estimate the crown leaf area index of the forest. The results showed that this model could well reflect the seasonal variation of crown leaf area. From the comparison of 3-year leaf area index series, it was found that the date when the leaf area index began to rise was postponed if the date when its air temperature stably surpassed 0 degrees C came late. The dynamics of the leaf area index in whole growth season could be divided into three stages, i. e., rising, relatively stable, and dropping, and at each stage, there was a greater correlation between the leaf area index and the accumulated temperature above 0 degrees C, which could be expressed by Logistic curve and linear equation. The problems existing in the observation and estimation of forest crown leaf area index were discussed.
Guan
De-Xin
DX
Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China. guan_dexin@126.com
Wu
Jia-Bing
JB
Wang
An-Zhi
AZ
Jin
Chang-Jie
CJ
Shi
Ting-Ting
TT
Han
Shi-Jie
SJ
D002681:China; D017753:Ecosystem; D008433:Mathematics; D028223:Pinus / Q000502:physiology*; D018515:Plant Leaves / Q000502:physiology; D011891:Rain; D012621:Seasons; D014197:Trees / Q000502:physiology*