西南地区亚高山典型林区土壤碳排放及影响因子

为进一步厘定西南地区亚高山典型林区土壤碳(carbon,C)排放的主控因素,更精确估算土壤C排放,该文以贡嘎山峨眉冷杉林为研究对象,利用Li-6400-09土壤呼吸室,采集了2008—2009年土壤CO2排放速率及相应环境要素数据。结果表明,成熟林与中龄林区土壤储量分别为291.0、63.8 t C/hm2。成熟林与中龄林全年土壤C排放速率整体变化态势基本一致。其中中龄林土壤C排放速率日均最大值、最小值与平均值分别为34.53、6.96、16.26 kg C/(hm2·d)。成熟林土壤C排放速率日均值的最大值、最小值与平均值分别为55.34、9.50、24.57 kg C/(hm2·d)。土壤...

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Published in农业工程学报 Vol. 31; no. 1; pp. 255 - 263
Main Author 李卫朋 孙建 沙玉坤 程根伟
Format Journal Article
LanguageChinese
Published 西华师范大学国土资源学院,南充 637002 2015
中国科学院大学资源与环境学院,北京 100049%中国科学院·水利部成都山地灾害与环境研究所山地表生过程与生态调控重点实验室,成都 610041
中国科学院·水利部成都山地灾害与环境研究所山地表生过程与生态调控重点实验室,成都 610041
中国科学院大学资源与环境学院,北京 100049%中国科学院地理科学与资源研究所生态网络观测与模拟重点实验室,北京,100101%中国科学院·水利部成都山地灾害与环境研究所山地表生过程与生态调控重点实验室,成都 610041
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ISSN1002-6819
DOI10.3969/j.issn.1002-6819.2015.01.034

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Summary:为进一步厘定西南地区亚高山典型林区土壤碳(carbon,C)排放的主控因素,更精确估算土壤C排放,该文以贡嘎山峨眉冷杉林为研究对象,利用Li-6400-09土壤呼吸室,采集了2008—2009年土壤CO2排放速率及相应环境要素数据。结果表明,成熟林与中龄林区土壤储量分别为291.0、63.8 t C/hm2。成熟林与中龄林全年土壤C排放速率整体变化态势基本一致。其中中龄林土壤C排放速率日均最大值、最小值与平均值分别为34.53、6.96、16.26 kg C/(hm2·d)。成熟林土壤C排放速率日均值的最大值、最小值与平均值分别为55.34、9.50、24.57 kg C/(hm2·d)。土壤C排放速率日均值与5 cm土壤温度表现的相关性最高(r 成熟=r 中龄=0.73,P〈0.05)且二者存在指数关系(R2成熟=0.60,R2中龄=0.56)。土壤温度是影响该区域土壤C排放变化的主要环境驱动因子。在IPCC不同气候情景下(B1,A1B和A2),成熟林土壤C排放量将比基准情景分别高出15%、25%和31%;中龄林土壤C排放量将比基准情景高13%、21%和27%。该研究可为变化环境下中国西南山区碳平衡估算提供数据基础和参考依据。
Bibliography:11-2047/S
soils;carbon;temperature;emission rate;climate scenarios;sub-alpine
Numerous results of carbon (C) emission of the subalpine dark conifer forest showed more or less differences for the great and complicated environmental temporal-spatial variation in the Gongga Mountain region in Southwestern China. For a more exact estimation of soil C emission in the subalpine forest and a more clear understanding of its impacting factors in the Mount Gongga, with the Li-6400-09 chamber, the soil CO2 emission and the main environment factors of the Abies fabri forests were studied. The results showed soil C storage (291.0 t/hm2, 49.8%of the forest ecosystem) in the mature Abies fabri forest is higher than that (63.8 t/hm2, 30.7%of the forest ecosystem) in middle-aged Abies fabri forest, which indicated the effects of stand age on soil C storage. Overall, the annual variation of the soil C emission rate in the mature Abies fabri forest showed a similar tendency as that in the middle-aged Abies fabri forest. For both
ISSN:1002-6819
DOI:10.3969/j.issn.1002-6819.2015.01.034