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题名:
Abiotic regulators of soil respiration in desert ecosystems
作者: Zhang, Lihua ; Chen, Yaning ; Li, Weihong ; Zhao, Ruifeng
通讯作者: Chen, YI, Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Key Lab Oasis Ecol & Desert Environm, Urumqi 830011, Peoples R China
关键词: CARBON-DIOXIDE FLUXES ; CO2 EFFLUX ; TEMPORAL VARIATION ; WATER CONTENT ; PINE FORESTS ; TEMPERATURE ; DEPENDENCE ; MOISTURE ; ENVIRONMENT ; GRASSLANDS
刊名: ENVIRONMENTAL GEOLOGY
发表日期: 2009
卷: 57, 期:8, 页:1855-1864
收录类别: SCI
部门归属: [Zhang, Lihua; Chen, Yaning; Li, Weihong; Zhao, Ruifeng] Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Key Lab Oasis Ecol & Desert Environm, Urumqi 830011, Peoples R China; [Zhang, Lihua; Zhao, Ruifeng] Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China
摘要: Soil temperature and soil moisture are the most important environmental factors controlling soil respiration in mesic ecosystems. However, soil respiration and associated abiotic regulators have been poorly studied in desert ecosystems. In this study, soil respiration was measured using an automated CO2 efflux system (LI-COR 8100), and the effects of soil temperature and moisture on the rate of soil respiration were examined in six desert sites [three communities-Haloxylon ammodendron, Halostachys caspica and Anabasis aphylla at high (B) and low (A) vegetation coverage respectively]. It was found that soil respiration was significantly and positively correlated with soil surface temperature. A multi-variable model of soil temperature and soil moisture could explain 61.9% of temporal variation in soil CO2 efflux at a larger scale. There were significantly negative correlations between soil respiration and soil moisture in Haloxylon ammodendron B and Halostachys caspica B sites, which represented the driest and wettest sites, respectively. The results also showed that soil respiration displayed obvious diurnal and seasonal patterns during the growing season. The Q(10) values for Haloxylon ammodendron A and B, Halostachys caspica A and B, and Anabasis aphylla A and B sites were 1.3, 1.34, 1.58, 1.65, 1.31 and 1.17, respectively, with a cross-site average of 1.39. The results showed that soil respiration was not positively correlated with soil moisture unlike in most mesic ecosystems. However, soil respiration in desert ecosystems is less sensitive to temperature variation than most mesic ecosystems as indicated by the lower Q(10) values possibly due to energy limitation.
内容类型: 期刊论文
URI标识: http://ir.xjlas.org/handle/365004/10172
Appears in Collections:中国科学院新疆生态与地理研究所(2010年以前数据)_期刊论文

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Recommended Citation:
Zhang, Lihua,Chen, Yaning,Li, Weihong,et al. Abiotic regulators of soil respiration in desert ecosystems[J]. ENVIRONMENTAL GEOLOGY,2009,57(8):1855-1864.
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