宝天曼不同海拔典型栎类林植被与土壤碳贮量及其分配格局

森林是陆地最大的碳库,主要包括植被碳库和土壤碳库两部分.地带性森林植被与土壤碳贮量核算及其分配格局成为全球变化背景下的研究热点.采用样地调查法,对河南省宝天曼不同海拔高度的3种典型栎类林植被与土壤碳贮量及其分配格局进行了对比研究.结果表明3种林型地上和地下植被碳贮量都随海拔升高而降低,但是地上/地下植被碳贮量比率却随海拔升高而增加.0¹0 cm、1010 cm、10²0 cm和2020 cm和20³0 cm土壤有机碳(SOC)贮量都随海拔升高表现出先升高后降低的趋势,该波动主要由底层土引起.森林总碳贮量并没有随海拔变化而表现出显著差异(p>0.05),由此推断植被和土壤碳贮量间存在着补偿效应.

Storage and Distribution Patterns of Biomass and Soil Organic Carbon in Typical Oak Forests at Different Altitude Levels in Baotianman

Forests incorporating biomass and soil organic carbon(SOC) storage maintain most of the continent carbon(C). Therefore studies on estimation and distribution of both biomass C and SOC in the local forests become hot issues under the background of global change. Based on the data from sampling plots setted up in three typical oak forests located at different altitude levels of Baotianman,we compare the distribution patterns of biomass C and SOC storage of these oak forests. Our results show that both above-and below-ground biomass C storage increase as altitudes increase,whereas the ratios of above-to below-ground C storages decrease simultaneously. SOC storage in 0 ~ 10,10 ~ 20 and 20 ~ 30 cm depth soil layers show an unimodal curve as altitude increases,SOC storage increases initially but decreases as altitude continues to increase. This trend is mainly caused by SOC of the bottom layers. It is interesting that total C storage of three oak forests does not vary significantly(p > 0. 05) as altitudes increase,This result implies an offset effect between biomass C and SOC storage.