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soil temperature and moisture sensitivities of soil co_2 efflux before and after tillage in a wheat field of Loess Plateau,China

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Journal of Environmental Sciences 2011年第1期23卷 79-86页

作者： Hongxing Zhang Xiaoke Wang Zongwei Feng Junzhu Pang Fei Lu Zhiyun Ouyang Hua Zheng Wenzhao Liu Dafeng Hui State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Institute of soil and Water conservation Chinese Academy of Sciences and Ministry of Water Resources Shaanxi 722400 China Department of Biological Sciences Tennessee State University 3500 John A. Merritt Blvd. Nashville TN 37209 USA

As a conventional farming practice, tillage has lasted for thousands of years in Loess Plateau, China. Although recent studies show that tillage is a prominent culprit to soil carbon loss in croplands, few studies have investigated the influences of tillage on the responses of soil co2 efflux （SCE） to soil temperature and moisture. Using a multi-channel automated co2 efflux chamber system, we measured SCE in situ continuously before and after the conventional tillage in a rain fed wheat field of Loess Plateau, China. The changes in soil temperature and moisture sensitivities of SCE, denoted by the Q10 value and linear regression slope respectively, were compared in the same range of soil temperature and moisture before and after the tillage. The results showed that, after the tillage, SCE increased by 1.2-2.2 times; the soil temperature sensitivity increased by 36.1%-37.5%; and the soil moisture sensitivity increased by 140%-166%. Thus, the tillage-induced increase in SCE might partially be attributed to the increases in temperature and moisture sensitivity of SCE.

关键词： soil co2 efflux Loess Plateau moisture sensitivity temperature sensitivity tillage wheat field

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Dependence of soil Respiration on soil Temperature and soil Moisture in Successional Forests in Southern China

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Journal of Integrative Plant Biology 2006年第6期48卷 654-663页

作者： Xu-Li Tang Guo-Yi Zhou Shu-Guang Liu De-Qiang Zhang Shi-Zhong Liu Jiong Li Cun-Yu Zhou South China Botanical Garden the Chinese Academy of Sciences Guangzhou 510650 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China Science Applications International corporation （ SAIC） US Geological Survey （ USGS） National Center for Earth Resources Observation and Science （EROS） Sioux Falls South Dakota 57198 USA

The spatial and temporal variations in soil respiration and its relationship with biophysical factors In forests near the Tropic of Cancer remain highly uncertain. To contribute towards an Improvement of actual estimates, soil respiration rates, soil temperature, and soil moisture were measured In three successional subtropical forests at the Dlnghuahan Nature Reserve （DNR） In southern China from March 2003 to February 2005. The overall objective of the present study was to analyze the temporal variations of soil respiration and Its biophysical dependence in these forests. The relationships between biophysical factors and soil respiration rates were compared In successional forests to test the hypothesis that these forests responded similarly to biophysical factors. The seasonality of soil respiration coincided with the seasonal climate pattern, with high respiration rates in the hot humid season （April-September） and with low rates In the cool dry season （October-March）. soil respiration measured at these forests showed a clear Increasing trend with the progressive succession. Annual mean （± SD） soil respiration rate In the DNR forests was （9.0 ± 4.6） Mg co2-C/hm^2 per year, ranging from （6.1 ± 3.2） Mg co2-C/hm^2 per year in early successional forests to （10.7 ± 4.9） Mg co2-C/hm^2 per year in advanced successional forests. soil respiration was correlated with both soil temperature and moisture. The T/M model, where the two biophysical variables are driving factors, accounted for 74%-82% of soil respiration variation In DNR forests. Temperature sensitivity decreased along progressive succession stages, suggesting that advanced-successional forests have a good ability to adjust to temperature. In contrast, moisture Increased with progressive succession processes. This increase is caused, in part, by abundant respirators In advanced-successional forest, where more soil moisture is needed to maintain their activities.

关键词： Dinghushan Nature Reserve moisture sensitivity Q10 soil co2 efflux soil respiration subtropical forests successional forests temperature sensitivity Tropic of Cancer.

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Impact of temperature and moisture on soil respiration:deconvolution analysis of field data in subtropical forests in southern China

Impact of temperature and moisture on soil respiration:decon...

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中国生态学会2006学术年会

作者：唐旭利中国科学院华南植物园

＜正＞Evaluation of the relative influence of temperature and moisture on soil respiration is critical for making reliable predictions of soil carbon（C）cycle,and for refining process based soil C mod- *** studies have encountered considerable difficulty in separating temperature and moisture impact on soil respiration on the basis of field data because these two factors are confounded in

关键词： deconvolution analysis soil co2 efflux impacts of soil temperature and soil moisture Dinghushan Nature Reserve

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