Seasonal and diurnal dynamics of soil respiration fluxes in two typical forests on the semiarid Loess Plateau of China: Temperature sensitivities of autotrophs and heterotrophs and analyses of integrated driving factors |
| |
| Institution: | 1. State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China;2. Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China;3. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi''an, Shaanxi 710075, China;4. Arid Land Research Center, Tottori University, Tottori 680-0001, Japan;5. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;1. Department of Ecology, College of Urban and Environmental Sciences, and Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, Beijing 100871, China;2. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;1. Key Laboratory of Forest Ecology and Environment, China’s State Forestry Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China;2. International Joint Research Laboratory for Global Change Ecology, State Key Laboratory of Cotton Biology, College of Life Science, Henan University, Kaifeng, Henan 475004, China;3. Division of Forestry and Natural Resources, West Virginia University, P.O. Box 6215, Morgantown, WV 26506-6125, USA;4. International Center for Bamboo and Rattan, Beijing 100102, China;1. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi''an, Shaanxi 710075, China;2. State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China;3. Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China;4. University of Chinese Academy of Sciences, Beijing 100049, China;1. Direction de la recherche forestière, Ministère des Forêts, de la Faune et des Parcs, 2700 rue Einstein, Québec, Québec G1P 3W8, Canada;2. Department of Biology, Indiana University, 1001 E. 3rd St., Jordan Hall 142, Bloomington, IN 47405-7005, United States;3. Centre d’Étude de la Forêt, Université du Québec à Montréal, Case postale 8888, succursale Centre-ville, Montréal, Québec H3C 3P8, Canada;1. Department of Forest and Ecosystem Science, The University of Melbourne, 4 Water Street, Creswick 3363, VIC, Australia;2. Department of Forest and Ecosystem Science, The University of Melbourne, 500 Yarra Boulevard, Richmond 3121, VIC, Australia;3. Department of Resource Management and Geography, The University of Melbourne, 500 Yarra Boulevard, Richmond 3121, VIC, Australia |
| |
| Abstract: | Partitioning of total soil respiration (RT) into autotrophic (RA) and heterotrophic (RH) components was undertaken in two typical (natural and artificial) forests on the temperate, semiarid Loess Plateau of China, to determine and compare temperature sensitivities between the two components. The natural secondary forest was dominated by oak (Quercus liaotungensis) while the artificial forest was a plantation of black locust (Robinia pseudoacacia). Soil CO2 efflux and different abiotic and biotic factors were measured during dormant and growing seasons. Temperature sensitivities of soil respiration components were investigated using the Q10 function at diurnal and seasonal scales. The temperature sensitivities of autotrophic (RA) and heterotrophic (RH) respiration varied with the time scales (daily, seasonal, or annual) of the investigation, and were affected by other biological and environmental factors. The largest contribution of RA to RT was 46% in the oak forest and 60% in the black locust plantation during the growing season. During the dormant season it was as low as 12% in the oak forest and 6% in the black locust plantation. The Q10 of RA for the black locust plantation was higher than for the oak forest during the growing season, but was lower during the dormant season. The Q10 of RA in both forests was higher than that of RH at both diurnal and seasonal scales. Multiple regression analyses suggested that photosynthesis is an important parameter in soil respiration studies and that a multiple-factor model may be more suitable during the annual periods. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
