福建师范大学学报（自然科学版）2013，Vol.29Issue(2)：68-74,124,8.
米槠天然更新次生林皆伐火烧后初期土壤呼吸日变化
Diurnal Variation of Soil Respiration after Clear-cutting and Slash Burning of Natural Regeneration Secondary Forest of Castanopsis carlesis in Subtropical China
摘要
Abstract
In order to estimate clear-cutting and slash burning effects on soil carbon sequestra tion in subtropical China, diurnal variation of soil respiration ( Rs) in residue retention (RR) and residue burnt ( RB) treatments in natural regeneration secondary stand of Castanopsis carlesis were measured using the IRGA method by a LI-8100 automated soil C02 flux system in Sanming, Fujian, China. The result showed that daily Rs showed a mono-peak trend, with its maximum rates from 11 am to 13 pm and minimum value from 3 pm to 7 pm. Mean daily Rs in RB (5. 59 fjunol ? m-2 ? s-1 ) plot was significantly higher than in the control (2. 27 μmol ? m -2 ? s-1 ) and RR (2. 30 μmol ? m-2 ? s-1) plots. Also, the diurnal range of Rs was the largest in RB plot (134. 6% ) , followed by RR (88. 0% ) and control (53. 3% ) plots. Relationships between Rs and environmen tal variables were examined via a regression analysis. A combination of temperature (including soil temperature at 5 cm depth and air temperature) and soil moisture content proved to be a reliable predictor of CO2 evolution in all plots. The Q10 values in RB plots were significantly higher than those in control and RR plots.关键词
米槠/天然更新次生林/皆伐/火烧/土壤呼吸/温度/土壤含水量Key words
Castanopsis carlesis/natural regeneration secondary forest/clear-cutting/slash burning/soil respiration/temperature/soil moisture分类
农业科技引用本文复制引用
林伟盛,杨智杰,郭剑芬,刘小飞,熊丽,吴君君,陈朝琪,杨玉盛..米槠天然更新次生林皆伐火烧后初期土壤呼吸日变化[J].福建师范大学学报（自然科学版）,2013,29(2):68-74,124,8.基金项目
国家自然科学基金重点资助项目(31130013) （31130013）
