米槠人促更新林皆伐火烧后初期土壤CO2通量动态

徐凯健; 林伟盛; 杨智杰; 任婕; 刘小飞; 熊德成; 谢锦升; 杨玉盛

米槠人促更新林皆伐火烧后初期土壤CO2通量动态

1.
福建师范大学地理科学学院, 湿润亚热带山地生态国家重点实验室培育基地, 福建福州 350007
基金项目:
国家自然科学基金重点项目"常绿阔叶林人促更新对红壤有机质维持的作用机制"(31130013)
中图分类号: S714

Analysis of CO2 Efflux in Soil Profiles after Clear-cutting and Prescribed Burning of Natural Regenerated Castanopsis carlesis Secondary Forest in Subtropical China

1.
College of Geographical Sciences, State Key Laboratory Breeding Base of Humid Subtropical Mountain Ecology, Fujian Normal University, Fuzhou 350007, Fujian, China
CLC number: S714

摘要: [目的]为科学评价皆伐、火烧对中亚热带常绿阔叶林不同深度土壤有机碳吸存的影响,[方法]以福建省中亚热带36年生米槠人促更新林为研究对象,采用非散射红外CO2浓度探测仪和Licor-8100土壤碳通量系统,并结合Fick扩散法计算并分析0~80 cm不同深度土层CO2通量的日动态特征。[结果]表明:(1)火烧地(RB)和皆伐地(RR)不同土层CO2浓度均出现明显下降,其中,对照(CK)地土壤CO2浓度值(0~80 cm)分别是RB和RR的1.9、1.3倍;(2)各试验地土壤CO2通量(0~80 cm)表现为RB(1.99 μmol·m2·s-1)>RR(0.99 μmol·m2·s-1)>CK(0.96 μmol·m2·s-1),除2040 cm土层外,RB土壤各层CO2通量均显著高于RR和CK(P2通量(0~80 cm)日变化幅度表现为RB>RR>CK,其中,RB土壤各层的变化幅度均显著大于RR和CK(P2通量与土壤温度呈显著相关,且 RB的决定系数(R2)显著高于RR和CK;不同试验地各土层温度、含水量的双因素模型拟合效果均优于单因素模型;Q10值显示,皆伐、火烧后初期土壤各层的温度敏感性得到明显提高。
- 土壤CO₂通量
- / 土壤深度
- / 皆伐
- / 火烧
- / 土壤CO₂浓度
Abstract: Clear-cutting & prescribed burning is one of the most common management measures in the economic development of Chinese forestry, which not only has a strong interference in woodland, but also leads to the changes in soil physical and chemical properties. In order to evaluate the importance of clear-cutting and prescribed burning on the soil organic carbon uptake and storage of different depths in mid-subtropical evergreen broad-leaved forest, taking 36-year-old natural regenerated Castanopsis carlesis secondary stand in Fujian Province as the object, the Fick's diffusion method were used to calculate the daily dynamic changes of soil CO2 flux from 0 to 80 cm depth of soil. And the relationship between the CO2 flux and soil temperature, moisture in soil profiles was also analyzed by using regression models. The results are as follows: (1) The CO2 concentration in different soil layers decreased significantly after clear-cutting and prescribed burning, and the closer to the surface, the larger the decline. From 0 to 80 cm soil depth, the mean daily CO2 concentration in the controlled (CK) plot was 1.9 times in residue burnt (RB) plot and 1.3 times in residue retention (RR) plot. And both in RB and RR plot, different depth of soil CO2 concentration decreased obviously. (2) The daily dynamic changes of CO2 flux in soil profile showed a mono-peak trend, with its maximum value mainly from 12:30 am to 15:30 pm as well as the minimum from 6:30 pm to 9:30 pm, the mean daily soil respiration in RB plot (1.99 μmol·m2·s-1) was significantly higher than that in RR plot (0.99 μmol·m2·s-1) and CK plot (0.96 μmol·m2·s-1), the whole soil CO2 flux in all the test plots decreased with the increasing of soil depth. The daily average CO2 flux in soil profile of RB plot was significantly higher than the others, except for the soil depth from 20 to 40 cm. And there was no significant difference on daily CO2 flux in soil profiles of RR and CK plot. (3) In addition, the diurnal range of soil CO2 flux in RB plot (147%) was higher than that in the RR (99%) and the CK plot (66%), and there are some significant differences of RB vs. RR and CK (PP2 flux vs. soil temperature, it was found that the CO2 efflux of different depth soil correlated exponentially with soil temperature in all plots, and the Q10 value showed that the sensitivity of soil temperature increased significantly after clear-cutting and prescribed burning. But the soil moisture was not significant correlated with CO2 efflux. And the hybrid model of temperature and soil moisture was proved to be a more appropriate predictor of CO2 dynamic state in all testing plots. Consequently, clear-cutting & prescribed burning could definitely affect CO2 flux in deep soil as well as its daily dynamic, and would also change the soil CO2 flux of soil temperature and moisture content of different soil layer response mechanism.
- soil CO₂ efflux
- / soil depth
- / clear-cutting
- / prescribed burning
- / soil CO₂ concentration

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米槠人促更新林皆伐火烧后初期土壤CO2通量动态

Analysis of CO2 Efflux in Soil Profiles after Clear-cutting and Prescribed Burning of Natural Regenerated Castanopsis carlesis Secondary Forest in Subtropical China

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米槠人促更新林皆伐火烧后初期土壤CO2通量动态

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Analysis of CO2 Efflux in Soil Profiles after Clear-cutting and Prescribed Burning of Natural Regenerated Castanopsis carlesis Secondary Forest in Subtropical China

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米槠人促更新林皆伐火烧后初期土壤CO2通量动态

Analysis of CO2 Efflux in Soil Profiles after Clear-cutting and Prescribed Burning of Natural Regenerated Castanopsis carlesis Secondary Forest in Subtropical China

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米槠人促更新林皆伐火烧后初期土壤CO2通量动态

English Abstract

Analysis of CO2 Efflux in Soil Profiles after Clear-cutting and Prescribed Burning of Natural Regenerated Castanopsis carlesis Secondary Forest in Subtropical China

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