Modeling height-diameter relationship for artificial monoculture Metasequoia glyptostroboides in sub-tropic coastal megacity Shanghai, China

《Modeling height-diameter relationship for artificial monoculture Metasequoia glyptostroboides in sub-tropic coastal megacity Shanghai, China》

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来源: URBAN FORESTRY & URBAN GREENING,Vol.34,P.226-232

语言: 英文

关键字: Urban forest; Mixed-effects model; Sampling design; Calibration; ALLOMETRIC RELATIONSHIPS; TREE HEIGHT; URBAN TREES; QUANTILE REGRESSION; PINUS-BANKSIANA; CARBON STORAGE; PICEA-MARIANA; BLACK SPRUCE; DOUGLAS-FIR; PLANTATIONS

作者单位: [Zheng, Ji; Yi, Shan; Sun, Ningxiao; Zhu, Penghua; Kang, Hongzhang; Liu, Chunjiang] Shanghai Jiao Tong Univ, Sch Agr & Biol, Dongchuan Rd 800, Shanghai 200240, Peoples R China. [Zheng, Ji; Yi, Shan; Sun, Ningxiao; Zhu, Penghua; Kang, Hongzhang; Liu, Chunjiang] State Forestry Adm, Shanghai Urban Forest Ecosyst Res Stn, Dongchuan Rd 800, Shanghai 200240, Peoples R China. [Zang, Hao] Jiangxi Agr Univ, Zhimin Rd 1101, Nanchang 330045, Jiangxi, Peoples R China. [Han, Yujie] Shanghai Forestry Stn, Hutai Rd 1053, Shanghai 200072, Peoples R China. [Liu, Chunjiang] Shanghai Jiao Tong Univ, Res Ctr Low Carbon Agr, Dongchuan Rd 800, Shanghai 200240, Peoples R China. Liu, CJ (reprint author), Shanghai Jiao Tong Univ, Sch Agr & Biol, Dongchuan Rd 800, Shanghai 200240, Peoples R China. E-Mail: chjliu@sjtu.edu.cn

摘要: Tree height is a key variable in forest monitoring studies and for forest management. However, tree height measurement is time consuming, and the recommended procedure is to use estimates from tree height (H) - diameter at breast height (DBH) models. Increasingly, H-DBH models are being developed for urban forests, providing tools to forest management and ecosystem services estimation. Here, we compared model forms and approaches for predicting H as a function of DBH and additional stand level covariates variables. Four model forms were evaluated: (i) basic models (which only used DBH as predictor variable); (ii) generalized models (which used DBH and other predictor variables based on the best basic model); (iii) a mixed-effects model based on the best basic model; and (iv) a mixed-effects model based on the generalized model. Several sampling designs aimed at minimizing height measurement were tested in terms of accuracy and applicability. Taking predicted accuracy and investigation cost into account, we recommend generalized non-linear mixed-effects model (NLME) when there were two or less tree height measurements taken in a given stand. The basic NLME model could be calibrated when there were 3 or more tree height measurements, depending on the required level of accuracy and investigation cost. Additionally, we first reported that soil pH as a covariate variable in H-DBH model and our generalized NLME model implied that the difference in the H-DBH relationship caused by pH varies among different stands. This finding may be attributable to differing biological properties of the similar alkaline tolerance species.