干旱区生态环境知识资源中心(Arid): 艾比湖地区土壤呼吸对季节性冻土厚度变化的响应

Arid

	艾比湖地区土壤呼吸对季节性冻土厚度变化的响应
其他题名	Responses of soil respiration to changes in depth of seasonal frozen soil in Ebinur Lake area, arid area of Northwest China
	秦璐 1; 吕光辉1 ; 何学敏 1; 张雪妮 1; 张雪梅 2; 孙景鑫 1; 李尝君 1; 杨晓东 3
来源期刊	生态学报
ISSN	1000-0933
出版年	2013
卷号	33 期号:22 页码:7259-7269
中文摘要	利用LI-8100土壤CO_2排放通量全自动测量系统，于2010年1-4月测定了艾比湖地区不同植被类型样地的土壤呼吸速率，结合环境因子、冻土厚度及室内土壤理化性质分析，探讨了温带干旱区季节性冻土厚度变化对土壤呼吸的影响。结果表明：土壤温度在冻结期是影响冻土厚度的最主要环境因子，而解冻期冻土厚度变化与土壤温度等环境因子关系不显著（P > 0.05）；冻土厚度在不同时期影响土壤呼吸速率的程度不同，冻结期两者呈显著正相关（R~2=0.782，P < 0.05），解冻初期两者呈弱相关（P > 0.05）；土壤呼吸速率在土壤冻结期与解冻初期不存在显著差异（P > 0.05），但在解冻完全期则表现出明显的增加趋势（差值为0.14-0.37mumol?m~(-2)?s~(-1)），表明冻土融化会明显地增加土壤碳排放，从而增加大气中的CO_2。结果阐明了艾比湖地区季节性冻土厚度变化对土壤呼吸的影响，为揭示全球变暖背景下冻土退化过程中的碳释放机理提供理论基础。
英文摘要	As an special process for soils in the regions of high altitude, the freeze-thaw process directly or indirectly influences the physical, chemical and biological properties of soils. Under the background of the global warming, increasing attention has been paid to the effect of soil freezing-thawing alternation on carbon cycles. By measuring the changes of depth of seasonal frozen soil, of soil properties and soil respiration, our main objective was to provide insight into the responses of soil properties and soil respiration to changes in depth of seasonal frozen soil in arid area, and to further elaborate the effect of global warming on seasonal frozen soil and the resulted carbon release. Soil respiration rate (Rs) of Ebinur Lake area was measured from January to April in 2010 in the field using an automated CO_2 efflux system (LI-8100). Meanwhile, temperature (air temperature), atmospheric relative humidity and wind speed were measured 150 cm above the ground. Temperature, atmospheric relative humidity and wind speed were also measured at 10 cm above the ground, with a handheld weather instrument. Soil temperatures were measured at 5 cm, 10 cm, 15 cm, 20 cm and 25 cm below soil surface with two geo-thermometers. The results showed that: during the frozen period, soil temperature is the most important factor determining the depth of frozen soil, while during thawing period, the depth of frozen soil was not influenced by temperature (P > 0.05). There was significant positive correlation between soil respiration rate and depth of frozen soil during most of the freezing period (R~2=0.782, P < 0.05), this correlation did not apply to the initial stage of freezing period (P > 0.05). There was no significant difference in soil respiration rate between the freezing period and the initial stage of freezing period, but soil respiration rate significantly increased with the temperature during thawing period until the soil was unfrozen completely (the changes was 0.14-0.37mumol?m~(-2)?s~(-1)), indicating that permafrost melting significantly increased soil carbon emissions. Climate change impact on seasonal frozen soil depth, on the duration of frozen period, will change the seasonal crop production in permafrost regions. The natural vegetation biomass, spatial distribution pattern of vegetation and ranges of natural native plants distribution will also be changed. Even the plant community succession direction and patterns may also be altered by the changes in duration and depth of frozen soil. All those will affect the ecosystem carbon cycling process. The difference in soil respiration rate of different periods was influenced by soil organic content, snow-melt recharging to soil water and other factors, which may have a collectively effect on carbon cycle of the local ecosystem. Our preliminary findings in the current study revealed the impacts of seasonal frozen-thawing process on soil respiration in Ebinur Lake area, and provided theoretical basis for revealing carbon release mechanism during frozen-thawing processes under the background of global warming.
中文关键词	土壤呼吸 ; 冻土厚度 ; 响应 ; 干旱区
英文关键词	soil respiration rate frozen soil depth response arid area
语种	中文
国家	中国
收录类别	CSCD
WOS类目	BIOLOGY
WOS研究方向	Life Sciences & Biomedicine - Other Topics
CSCD记录号	CSCD:5001969
来源机构	中国科学院新疆生态与地理研究所 ; 新疆大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/230050
作者单位	1.新疆大学资源与环境科学学院, 新疆绿洲生态教育部重点实验室, 乌鲁木齐, 新疆 830046, 中国; 2.中国科学院新疆生态与地理研究所, 新疆绿洲生态教育部重点实验室, 乌鲁木齐, 新疆 830011, 中国; 3.华东师范大学环境科学与技术系, 新疆绿洲生态教育部重点实验室, 上海 200241, 中国
推荐引用方式 GB/T 7714	秦璐,吕光辉,何学敏,等. 艾比湖地区土壤呼吸对季节性冻土厚度变化的响应[J]. 中国科学院新疆生态与地理研究所, 新疆大学,2013,33(22):7259-7269.
APA	秦璐.,吕光辉.,何学敏.,张雪妮.,张雪梅.,...&杨晓东.(2013).艾比湖地区土壤呼吸对季节性冻土厚度变化的响应.生态学报,33(22),7259-7269.
MLA	秦璐,et al."艾比湖地区土壤呼吸对季节性冻土厚度变化的响应".生态学报 33.22(2013):7259-7269.