Investigation of Uncertainties of Establishment Schemes in Dynamic Global Vegetation Models

作     者：ZENG Xiaodong LI Fang SONG Xiang 

作者机构：International Center for Climate and Environmental Sciences Institute of Atmospheric PhysicsChinese Academy of Sciences 

出 版 物：《Advances in Atmospheric Sciences》 (大气科学进展（英文版）)

年 卷 期：2014年第31卷第1期

页      面：85-94页

核心收录：

学科分类：07[理学] 08[工学] 09[农学] 071007[理学-遗传学] 090102[农学-作物遗传育种] 0710[理学-生物学] 083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 0804[工学-仪器科学与技术] 0903[农学-农业资源与环境] 0816[工学-测绘科学与技术] 081602[工学-摄影测量与遥感] 0901[农学-作物学] 0836[工学-生物工程] 081102[工学-检测技术与自动化装置] 0811[工学-控制科学与工程] 

基　　金：supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA05110103) the State Key Project for Basic Research Program of China(Grant No.2010CB951801) the National High Technology Research and Development Program of China(863 Program)(Grant No.2009AA122105) 

主　　题：Dynamic Global Vegetation Model uncertainty establishment scheme PFT classification fractional coverage 

摘      要：In Dynamic Global Vegetation Models （DGVMs）, the establishment of woody vegetation refers to flowering, fertiliza- tion, seed production, germination, and the growth of tree seedlings. It determines not only the population densities but also other important ecosystem structural variables. In current DGVMs, establishments of woody plant functional types （PFTs） are assumed to be either the same in the same grid cell, or largely stochastic. We investigated the uncertainties in the competition of establishment among coexisting woody PFTs from three aspects： the dependence of PFT establishments on vegetation states; background establishment; and relative establishment potentials of different PFTs. Sensitivity experi- ments showed that the dependence of establishment rate on the fractional coverage of a PFT favored the dominant PFT by increasing its share in establishment. While a small background establishment rate had little impact on equilibrium states of the ecosystem, it did change the timescale required for the establishment of alien species in pre-existing forest due to their disadvantage in seed competition during the early stage of invasion. Meanwhile, establishment purely fiom background （the scheme commonly used in current DGVMs） led to inconsistent behavior in response to the change in PFT specification （e.g., number of PFTs and their specification）. Furthermore, the results also indicated that trade-off between irtdividual growth and reproduction/colonization has significant influences on the competition of establishment. Hence, further development of es- tablishment parameterization in DGVMs is essential in reducing the uncertainties in simulations of both ecosystem structures and successions.