生态学报2017，Vol.37Issue(1)：93-101,9.DOI:10.5846/stxb201608191698
应用高频观测探讨不同森林经营方式下矿质土壤呼吸的昼夜动态特征
High-frequency analysis of the diel patterns of mineral soil respiration under different forest management
摘要
Abstract
Mineral soil respiration is an important route for the loss soil carbon (C) in forest ecosystems,and it is a key factor for estimating the forest ecosystem carbon balance.Making sense of mineral soil respiration variation on temporal and spatial scales is a critical component of understanding forest ecosystem C cycle responses to climate change.Thus,highfrequency measurements have become one of the primary tools used to measure mineral soil respiration on both temporal and spatial scales.The objective of this study was to compare a manual system (Li-8100A) with an automated system for measuring mineral soil respiration in a subtropical forest.We carried out the study in a secondary Castanopsis carlesii forest with different forest management (Control,CK;Residual retention after clear cutting,RR;Residual burning after clear cutting,RB) in Sanming,Fujian.The results obtained were as follows.(1) The mineral soil respiration flux,soil temperature,and soil moisture content under different forest managements all showed obvious seasonal dynamics,and mineral soil respiration rates were in the order of CK (2.18 μmol m-2 s-1) ＞ RB (1.93 μmol m-2 s-1) ＞ RR (1.89 μmol m-2 S-1).(2) The annual flux determined using high-frequency measurement was significantly higher than that determined using the manual system,whereas there was no difference between the soil respiration rate calculated between 09:00 and 11:00 (high-frequency data) for different forest managements.(3) Soil hydrothermal condition is one of the important factors affecting mineral soil respiration under different forest management.A two-factor model show that included soil temperature and moisture explained the annual variation of mineral soil respiration rate as 96.8％,62.8％ and 95.4％ in CK,RR,and RB treatments,respectively.The double factors model demonstrated that combined with soil temperature and moisture was explained the annual variation of mineral soil respiration rate 96.8％,62.8％ and 95.4％ in CK,RR and RB,respectively.The results obtained using this model were better than those obtained using a single-factor model.Therefore,in order to accurately assess and predict the effects of different forest management on the C flux exchange between the soil and atmosphere under future climate change,high-frequency measurements should be considered.关键词
不同森林经营方式/高频自动观测/矿质土壤呼吸/昼夜动态/碳通量Key words
different forest management/high frequency automatic observation/mineral soil respiration/diurnal patterns/carbon flux引用本文复制引用
郑永,杨玉盛,刘小飞,郑蔚,周嘉聪,苏瑞兰,林伟盛,熊德成,胥超,陈岳民..应用高频观测探讨不同森林经营方式下矿质土壤呼吸的昼夜动态特征[J].生态学报,2017,37(1):93-101,9.基金项目
国家自然科学基金重点资助项目(31130013) （31130013）
国家自然科学基金资助项目(31500407) （31500407）
福建省教育厅B类科技资助项目(JB14025) （JB14025）
