The effects of stump size and within-gap position on sprout non-structural carbohydrates concentrations and regeneration in forest gaps vary among species with different shade tolerances
作者机构：CAS Key Laboratory of Forest Ecology and ManagementInstitute of Applied EcologyShenyang 110016China Qingyuan Forest CERNChinese Academy of SciencesShenyang 110016China Department of Forestry and Environmental ConservationClemson UniversityClemsonSC 29634USA
出 版 物：《Ecological Processes》 (生态过程（英文）)
年 卷 期：2021年第10卷第1期
页 面：337-350页
核心收录：
学科分类：09[农学] 0903[农学-农业资源与环境]
基 金：supported by grants from the Strategic Leading Science&Technology Programme,CAS(XDA23070100) National Natural Science Foundation of China(U1808201,31330016) Liaoning Revitalization Talents Program(XLYC1807102)
主 题：Non-structural carbohydrates Sprout regeneration Sprout growth Sprout survival Within-gap position Stump size
摘 要：Background:To restore secondary forests(major forest resources worldwide),it is essential to accelerate the natural regeneration of dominant trees by altering *** gaps are products of various disturbances,ranging from natural storms or wildfires to anthropogenic events like logging and slashing-andburning,and sprouts of most tree species with non-structural carbohydrates(NSCs)storage can regenerate from stumps after gap ***,how the stump sprouts with diverse NSCs storages and stump sizes(i.e.,diameters)adapt to various micro-environments of within-gap positions remains *** in this study,we monitored the stump sprout regeneration(density,survival,and growth)and NSCs concentrations of three dominant tree species with different shade tolerances and varying stump diameters at five within-gap positions for the first two consecutive years after gap ***:Stump diameter was positively correlated with sprout density,growth,and survival of all three tree species,but insignificantly related with sprout NSCs concentrations at the early stage after gap *** effect of within-gap position on sprout NSCs concentrations was different among *** an environmental adaptation of two growing seasons,the north of gap(higher light availability and lower soil moisture habitat)was the least conducive for shade-intolerant Quercus mongolica to accumulate leaf NSCs,and the east of gap(shadier and drier habitat)was conducive to increasing the leaf NSCs concentrations of shade-tolerant Tilia ***:Within-gap position significantly affected leaf NSCs concentrations of all three tree species,but most of the sprout growth,survival,and stem NSCs concentrations were independent of the various within-gap *** stump diameter,the NSCs stored in stump and root systems and the interspecific differences in shade tolerance also contributed more in sprout regeneration at the early stage(2 years)of g
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