IMHE OpenIR  > 山地表生过程与生态调控重点实验室
Alternative TitleCarbon emission and its influence factors of subalpine forest soil in Southwest China
李卫朋1,2,3; 孙建4; 沙玉坤1,3; 程根伟1
Corresponding Author李卫朋
Source Publication农业工程学报
Other Abstract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;  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 of the mature and middle-aged Abies fabric forests, the monthly soil C emission rate in the growing season (May to October) is much higher than that in the non-growing season (November to the next April), and the maximum in summer is 5~6 times as large as that of the minimum in winter; while the soil C emission rate each month in the mature Abies fabri forest is on average 1.5 times as large as that in the middle-aged Abies fabri forest. The soil temperature, soil moisture and monthly soil CO2 emission rate generally fluctuate in synchrony under the warm and humid climate during growing season. The peak of monthly soil CO2 emission rate in the middle-aged Abies fabri forest, 34.53 kg C/(hm2·d), occures in July (the warmest and the most humid month for both of the forest soils in middle-aged and mature Abies fabri forest), while the valley, 6.96 kg C/(hm2·d), appears in February (the coldest and driest month for the forest soils in middle-aged Abies fabri), with an average of 16.26 kg C/(hm2·d) and a variation coefficient of 0.54. The maximum of monthly soil CO2 emission rate in the mature Abies fabri forest, 55.34 kg C/(hm2·d), delays one month to August, and there are two small peaks in May and December, respectively; while the minimum, 9.50 kg C/(hm2·d), delays to January, later than December that is the driest month for the mature Abies fabri forest soil, and earlier than March, the coldest month. The soil C emission rate in the mature Abies fabri forest has an average of 24.57 kg C/(hm2·d) and a variation coefficient of 0.61, which implies the mature Abies fabri forest ecosystem has more self-adjusting function. The daily average soil CO2 emission rate has more obvious correlation with soil temperature in 5 cm depth (the representative layer for the microbial activity and upper soil average heat condition) rather than air temperature, relative humidity, precipitation, and photosynthetically active radiation (PAR) in both the mature and middle-aged Abies fabri forests (r=0.73, P<0.05; the two forests are the same), and the fitted curves showed their exponential relationships (R2=0.60 for the mature forest and R2=0.56 for the middle-aged forest). In the subalpine cold-humid condition, without the high temperature inhibition, the soil moisture (monthly variation ranged from 14% to 30%) can hardly become the limiting factor, while the soil temperature plays a key role on soil C emission. Under the typical Intergovernmental Panel on Climate Change (IPCC) series of emission scenarios (SRES), i.e., B1, A1B and A2, the soil C emissions are expected to be increased by 15%, 25% and 31% respectively from the mature Abies fabri forest soil, and by 13%, 21% and 17% respectively from the middle-aged Abies fabri forest soil. It indicates that the stand age should be attached more importance in the C emission investigation and monitoring. The research provides basic data and references for the C balance estimation in the region under changing environment.
Keyword土壤 温度 排放速率 气候情景 亚高山
Subject AreaS714
Funding Organization中国科学院西部行动计划项目"西藏高原生态安全屏障监测评估方法与技术研究"(KZCX2-XB3-08)
Document Type期刊论文
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
李卫朋,孙建,沙玉坤,等. 西南地区亚高山典型林区土壤碳排放及影响因子[J]. 农业工程学报,2015,31(1):255-263.
APA 李卫朋,孙建,沙玉坤,&程根伟.(2015).西南地区亚高山典型林区土壤碳排放及影响因子.农业工程学报,31(1),255-263.
MLA 李卫朋,et al."西南地区亚高山典型林区土壤碳排放及影响因子".农业工程学报 31.1(2015):255-263.
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