文献类型：期刊文献

英文题名：Tree Species Mixing Effects on Radial Growth: A Comparison between Even- and Uneven-Aged Stands

作者：Chen, Renjie[1] Guo, Xiali[1] Ge, Yuxian[1] Li, Qidong[1] Ming, Angang[2] Min, Huilin[2] Shen, Weijun[1]

第一作者：Chen, Renjie

机构：[1] Guangxi Key Laboratory of Forest Ecology and Conservation, State Key Laboratory for Conservation, Utilization of Agro-bioresources, College of Forestry, Guangxi University, Guangxi, Nanning, 530004, China; [2] Guangxi Youyiguan Forest Ecosystem Research Station, Experimental Center of Tropical Forestry, Chinese Academy of Forestry, Pingxiang, 532600, China

年份：2023

外文期刊名：SSRN

收录：EI(收录号：20240000979)

语种：英文

外文关键词：Biodiversity - Climate change - Forestry

摘要：Establishing mixed species forests with complex structures and high biodiversity has emerged as a key approach to enhance productivity and maintain the stability of plantation forests. However, how the mixing effect changes with stand development and climate variation is still unclear. Additionally, little is known about how the mixing effects vary between even- and uneven-aged mixed planting strategies based on the same species combinations. In this study, we used dendrochronological methods to reconstruct 39-year annual productivity data for even-aged mixed plantations (EMs) and uneven-aged mixed plantations (UEMs) of Pinus massoniana and Castanopsis hystrix, as well as their respective monocultures, at both the individual tree (286 trees in total) and stand (5 stands) levels. We found that even-aged mixing did not significantly affect stand productivity, while the individual growth of P. massoniana and C. hystrix was 20.8% lower and 26.2% higher than that of their monocultures, respectively. However, the individual growth of P. massoniana remained unchanged in the initial 17 years of mixing, after which it was significantly suppressed by C. hystrix. Regarding the UEM, the annual mean stand productivity was 17.4% higher than the weighted mean of their respective monocultures, while the individual growth of P. massoniana and C. hystrix was 20.8% and 26.2% lower than that in their monocultures, respectively. Remarkably, the mixing effect on the radial growth of P. massoniana shifted from suppression to promotion after 31 years of mixing. Furthermore, the relative productivity of uneven-aged mixed stands increased with dry season precipitation and wet season temperature. These results indicate that transforming pure plantations into uneven-aged mixed plantations is a crucial forest management strategy to enhance productivity in the future warming climate. However, in even-aged mixtures, thinning should be conducted before fast-growing, shade-intolerant species experience intense light competition. ? 2023, The Authors. All rights reserved.