文献类型：期刊文献

英文题名：Spring Phenology Asynchronization between Planted and Natural Coniferous Forests in a Subalpine Catchment of Southwest China

作者：Sun, Pengsen[1] Liu, Ning[2] Zhang, Lei[3] Yu, Zhen[4] Sun, Meirong[1] Harper, Richard[5] Liu, Shirong[1]

第一作者：孙鹏森

机构：[1] Key Laboratory of Forest Ecology and Environment of the National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing, 100091, China; [2] Eastern Forest Environmental Threat Assessment Center, Southern Research Station, U.S. Department of Agriculture Forest Service, Research Triangle Park, NC, United States; [3] Research Institute of Forestry, Chinese Academy of Forestry, Beijing, China; [4] Institute of Ecology, School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing, China; [5] College of Science, Health, Engineering and Education, Murdoch University, South Street, Murdoch, WA, Australia

年份：2023

外文期刊名：SSRN

收录：EI(收录号：20240004654)

语种：英文

外文关键词：Catchments - Forestry - Frozen soils - Soil conservation - Water conservation - Water management

摘要：The phenological responses of planted (PC) and natural coniferous forests (NC) to the warming climate have important hydrological and ecological implications for sub-alpine watershed management in southwest China, while their differences remain poorly understood. Here, temporal frequency histogram (TFH) method as well as four new spring phenology indices including 10% SOS (SOS10), 90% SOS (SOS90), peak SOS (SOSp) and SOS duration (SOSd) were used to examine the forests’ spring phenology processes and asynchrony in responses to climate change during the last two decades. We found distinct earlier start of season (SOS), later end of season (EOS) and lower elevation gradient (EG) delay rate in NC than PC. The two forests’ TFH shifted from asynchronization at SOS10 (7.6 days) to synchronization at SOS90 (0.13 days), signaled a change from structural to climatic domination on spring phenology. Correlation analysis revealed the significance of heat requirement (HR) to spring phenology. The positive HR and chilling accumulation (CA) relationship suggested the importance of the minimum temperature rather than mean temperature to early spring phenology. Low freezing temperature in alpine region associated with the heat requirements are not only for forest phenology initiation, but also for snowmelt and frozen soil thawing. Beside temperatures, PC showed higher susceptibility to precipitation and insolation than NC. In general, our study suggested a stronger phenological resilience of NC than PC, whereas the climate warming trend is an advantage to PC uphill expansion. Practices such as thinning or pruning are suggested to optimize the utilization of water and light in PC. Increased understanding of the interactive multiple environmental controls on detailed phenological processes are crucial to ascertain how the subalpine forests sustain the continuous climate change in future. ? 2023, The Authors. All rights reserved.