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罗春林,侯琳.抚育对林地土壤碳释放的影响 ———基于Yasso07 估算.生态学报,2017,(9).http://dx.doi.org/10.5846/stxb201601270197  
抚育对林地土壤碳释放的影响 ———基于Yasso07 估算
Effect of forest thinning on soil CO2 emission in a pine-oak mixed stand in the Qinling Mountains-based on Yasso07 model estimate
投稿时间:2016-01-27  最后修改时间:2016-10-13
DOI: 10.5846/stxb201601270197
关键词间伐  土壤碳释放  Yasso07模型  松栎混交林  秦岭
Key WordsForest thinning  Soil CO2 emission  Yasso07 soil carbon model  Pine-oak mixed forest  the Qinling Mountains.
基金项目国家林业公益性行业科研专项(201304307)
作者单位E-mail
罗春林 西北农林科技大学林学院 clluo@139.com 
侯琳 西北农林科技大学林学院 houlin_1969@nwsuaf.edu.cn 
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摘要:
间伐是森林经营的有效措施之一,其能减少林木枯损,有利于林下植被生长和植物种群更新,但也可改变森林微气候,从而影响林地土壤碳释放。以秦岭火地塘林区松栎混交林为研究对象,运用Yasso07模型模拟了不同间伐强度和间伐残留物移除强度下林地土壤CO2释放。结果表明:(1)针叶树种(油松Pinus tabulaefomis、华山松Pinus armandi)和阔叶树种(锐齿栎Quercus aliena var. acutesrrata)叶凋落物化学组分有较明显差异,针叶树种酒精溶解性化合物(ESC)和水溶性化合物(WSC)含量明显低于阔叶树种,其不溶性化合物(NSC)含量明显高于阔叶树种;(2)在本研究两个控制因子中,间伐强度是影响林地土壤CO2释放的主导因子,间伐增加了林地土壤CO2释放;(3)凋落物化学组分对林地土壤CO2释放有显著的影响;(4)当间伐强度为12.38%,间伐残留物移除强度为53.18%时,林地土壤CO2释放量最小,为15.318 Mg.hm-2.a-1
Abstract:
Natural forest protection program implemented to increase volume of stands and diversity of forest ecosystem, and improved forest resources. However, its brings out some negative influence to the forest, such as high stand density, poor growth, easily cause insect outbreaks and fire disaster. Forest thinning is one of the effective measures to eliminate negative influence that natural forest protection caused in forest management. Forest thinning program has been conducted for several years, it decreased trees mortality and accelerated the natural regeneration. However, it has also demonstrated forest micro climates, and influence soil CO2 emission. The experiment was carried out to test effects of forest thinning on soil CO2 emission with the method of model simulating in a Pine-oak mixed forest at Huoditang forest zone in the Qinling Mountains. The Qinling Mountains’s topography is complicated and fractured, so it is difficult to meet the demand of duplicates experiment plots in the randomized blocks design. The quadratic general rotary design was applied, and thinning intensity and residue removed intensity were considered as factors in the experiment. Selected 13 experiment plots , each control factor set up 5 levels and 9 treatments, and laid 5 litter fall collection frames (1 m×1 m)in each experiment plot, collected the litter fall each month from Sept. 2012 to Sept. 2014. Determine the content of Ethanol Soluble Compound, Water Soluble Compound, Acid Soluble Compound and Non-Soluble Compound of leaf litter fall. For a long time, although the measure technology of soil CO2 emission improved continuously, the spatial heterogeneity of soil and strong stability of soil carbon in undisturbed circumstances lead to many methods have poor accuracy in the forest soil carbon dynamic research. Yasso07 is a soil carbon decomposition model that based on the assumption of cause four kinds of transformation among different libraries of litter, it widely used in Europe and the united states because operate easily, need few parameters, easy to obtain parameters and the simulate results reliable, and whether it can directly apply in the Qinling Mountains, there is no basis. The study validated the reliability of Yasso07 model in this region. Based on model simulating, traits of soil CO2 emission under different thinning and residue removed intensities were analyzed. The results indicated as follows: (1)There are significant between conifer and broadleaf tree about litter leaf chemical composition, content of Ethanol soluble compound and Water soluble compound of conifer significantly higher than broadleaf tree, and Non-soluble compound less ; (2)The thinning intensity was the key factor to affect the CO2 emission between two control factors in this study, Soil CO2 emission increased from forest thinning; (3) Chemical composition of litter fall have significant effect on soil CO2 emission; (4) When the thinning intensity was 12.38% and residue removed intensity was 53.18%, the soil CO2 emission reached minimum-15.318 Mg·hm-2·a-1.
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