摘要
为探明武夷山不同海拔不同类型森林的土壤碳氮特征,以武夷山常绿阔叶林(海拔800~1 200 m)和针阔混交林(海拔1 300~1 700 m)为研究对象,在每隔100 m的海拔梯度取样分析两种类型森林土壤的碳氮含量。结果表明,0~10 cm土层(上层),土壤有机碳、全氮、碱解氮、微生物生物量碳和微生物生物量氮含量以及微生物熵均与海拔之间呈显著(P<0.05)或极显著(P<0.01)正相关关系;针阔混交林的土壤有机碳、全氮、碱解氮、微生物生物量碳、微生物生物量氮含量以及微生物熵均显著高于常绿阔叶林(P<0.05);土壤有机碳、全氮、碱解氮、微生物生物量碳以及微生物生物量氮含量等相互之间均呈极显著正相关(P<0.01)。10~20 cm土层(下层),土壤碳氮含量与海拔之间也呈正相关关系,但是相关系数小于0~10 cm土层;针阔混交林的碳氮含量均高于常绿阔叶林,但两者之间的差异小于0~10 cm土层的差异。综上,就0~10 cm和10~20 cm土层而言,武夷山针阔混交林土壤碳氮含量总体高于常绿阔叶林,高海拔森林更有利于土壤碳氮积累,但是如果森林处于垂直分布的上限,则其土壤碳氮含量存在下降的趋势。
We explored the characteristics of soil carbon and nitrogen in different types of forests at different altitudes in the Wuyi Mountains. Evergreen broad-leaved forest(altitude range 800-1 200 m) and coniferous and broad-leaved mixed forest(altitude range 1 300-1 700 m) were chosen for the present study, and soil carbon and nitrogen contents were measured at an altitude gradient of every 100 m. The results showed that the contents of organic carbon, total nitrogen, alkali hydrolyzable nitrogen, microbial biomass carbon, microbial biomass nitrogen, and microbial quotient in 0-10 cm soil layer(the upper soil horizon) increased significantly(P<0.05) or highly significantly(P<0.01) with an increase in altitude. The contents of soil organic carbon, total nitrogen, alkali hydrolyzable nitrogen, microbial biomass carbon, microbial biomass nitrogen, and microbial quotient in the topsoil of the coniferous and broad-leaved mixed forest were significantly higher than those in the soil of the evergreen broad-leaved forest(P<0.05). The variables showed positive and significant correlation with each other(P<0.01). The carbon and nitrogen contents in 10-20 cm soil layer(the subsoil horizon) also showed a positive correlation with altitude, but the correlation coefficient was less than that for topsoil. The carbon and nitrogen contents in the subsoil of the coniferous and broad-leaved mixed forest were higher than those in the soil of the evergreen broad-leaved forest, but the difference between them was less than that measured for these variables in the topsoil. In conclusion, in the Wuyi Mountains, the soil carbon and nitrogen contents in the 0-10 cm and 10-20 cm soil horizons of the coniferous and broad-leaved mixed forest are generally higher than that in the soil of the evergreen broad-leaved forest. High altitude favors the accumulation of more soil carbon and nitrogen, but if the forest is situated at the upper limit of the vertical distribution, its soil carbon and nitrogen contents may show a declining trend.
作者
钱琦
钱壮壮
葛晓敏
秦波
丁晖
唐罗忠
QIAN Qi;QIAN Zhuangzhuang;GE Xiaomin;QIN Bo;DING Hui;TANG Luozhong(Co-Innoratioo Center for the Sustainable Forestry in Southern China,Nanjing Foresty University,Nanjing,Jiangsu 210037,China;Collepe of Forestry,Nnjing Foreaty Unirersity,Nanjing,Jiangsu 210037,China;Research Center for Nature Consenation and Biodivernity,Nanjing Institute of Enrinomental Sciences,Ministary of Ecology and Eovironment,Nanjing,Jiangu 210042,China;State Enviroamental Protectioa Scientifie Oberation and Research Station for Eological Environment of Wuyi Mountains,Nanjing,Jiangsu 210042,China)
出处
《森林与环境学报》
CSCD
北大核心
2022年第3期225-234,共10页
Journal of Forest and Environment
基金
中央级公益性科研院所基本科研业务专项(GYZX200203、GYZX210503)
生态环境部生物多样性调查、观测和评估项目(2110404)
江苏高校优势学科建设工程项目(PAPD)。
关键词
土壤
有机碳
氮
微生物生物量
植被类型
海拔
soil
organic carbon
nitrogen
microbial biomass
vegetation type
altitude
