干旱区生态环境知识资源中心(Arid): 温带草原11个植物群落处夏秋壤呼吸对气温变化的响应

Arid

	温带草原11个植物群落处夏秋壤呼吸对气温变化的响应
其他题名	Responses of soil respiration to temperature in eleven communities in xilingol grassland,inner mongolia
	陈全胜; 李凌浩; 韩兴国; 阎志丹; 王艳芬; 张炎; 袁志友; 唐芳
来源期刊	植物生态学报
ISSN	1005-264X
出版年	2003
卷号	27 期号:4 页码:441-447
中文摘要	在复秋季节，采用碱液吸收法对锡林郭勒草原11个群落的土壤呼吸进行了测定，比较和分析了各群落土壤呼吸的季节动态、平均呼吸速率、土壤呼吸对气温变化的响应。结果表明：1）各群落土壤呼吸有明显的秀节变化，其动态与气温大体一致，但不完全同步；2）生长季各群落平均呼吸速率介于565.07-1349.56mgC·m~-2·d~-1之间，总体差异极显著，各群落平均呼吸速率与平均气温无显著相关关系；3）指数模型能较好地表示土壤呼吸对温度变化的响应，温度能在一定程度上解释土壤呼吸的季节变化，但温度较低时模型的拟合好于温度较高时；4）各群落的Q_10值介于1.47-1.84之间，与各群落的平均气温亦无显著相关关系，小麦群落的Q_10高于所有草地群落，说明土地利用方式对土壤呼吸的温度敏感性有影响。
英文摘要	Soil surface carbon dioxide flux, the sum of plant and microbial respiration, is an important compo?nent of the carbon cycle of terrestrial ecosystems. Temperature is a key factor that regulates many terrestrial biogeochemical processes, such as soil respiration. Numerous studies show that soil respiration increases with temperature, creating a positive feedback to global warming. Accurately quantifying the relationship between soil respiration and temperature is necessary, because it will help to develop mechanisms of the feedback, which will aid in predicting the tendency of global change.In order to determine the law of soil respiration dynamics driven by temperature, and to detect the sensi?tivity of soil respiration in response to temperature in different communities of temperate grassland, in summer and autumn, we measured soil respiration in eleven communities using the alkali absorption method. We exam?ined seasonal patterns of soil respiration, average respiration rate and responses of soil respiration to tempera?ture. All the communities were located in Xilin River Basin, which has a typical temperate and semi-arid cli?mate.The seasonal variations of soil respiration were similar to those of temperature, but were not completely consistent with each other. The highest value of soil respiration was in summer (June to Aug. ) . Average soilrespiration rates of all communities varied from 565.07 mg C ? m ~(-1) ? d ~(-2)to 1 349.56 mg C ? m ~(-1) ? d ~(-2) , and the difference was significant (p < 0.001) . Respiration was greatest in wet mixed grasses community and least in Caragana stenophylla community. There was no notable relationship between average soil respiration and air temperature in all eleven communities, though relation of soil respiration and temperature could be describedwell by exponential functions for each community (R2 = 0.330 5-0.731 2, p < 0.000 1 - 0.022 0) . The modeling was better at lower temperature than at higher. Qw values of all communities were between 1.47 and 1.84, which were similar to or a little higher than the value in global scale. The Q-(10)value of wheat community was higher than that of other communities, which implied that land use could affect the sensitivity of soil respi?ration to temperature, and cultivation of the soil in grassland might be a C02 source for atmosphere along with global warming.
中文关键词	CO_2排放量 ; Q_10值 ; 温度敏感性 ; 模拟 ; 土地利用
英文关键词	CO_2efflux Q_10 value temperature sensitivity modeling land use
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:1304408
来源机构	中国科学院植物研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/204567
作者单位	中国科学院植物研究所, 植被数量生态学重点实验室, 北京 100093, 中国
推荐引用方式 GB/T 7714	陈全胜,李凌浩,韩兴国,等. 温带草原11个植物群落处夏秋壤呼吸对气温变化的响应[J]. 中国科学院植物研究所,2003,27(4):441-447.
APA	陈全胜.,李凌浩.,韩兴国.,阎志丹.,王艳芬.,...&唐芳.(2003).温带草原11个植物群落处夏秋壤呼吸对气温变化的响应.植物生态学报,27(4),441-447.
MLA	陈全胜,et al."温带草原11个植物群落处夏秋壤呼吸对气温变化的响应".植物生态学报 27.4(2003):441-447.