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《Acta Ecologica Sinica》 2005-08
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Root respiration in a natural forest and two plantations in subtropical China: seasonal dynamics and controlling factors

CHEN Guang-Shui~1, YANG Yu-Sheng~(1*), WANG Xiao-Guo~2, XIE Jin-Sheng~2, GAO Ren~1, LI Zhen~2 (1.Fujian Key Lab. of Subtropical Resources and Environments, College of Geography Science, Fujian Normal University, Fuzhou 350007, China; 2. College of Forestry, Fujian Agricuture and Forestry University, Fuzhou 350002, China).  
Tree root respiration is a primary contributor to the soil CO_2 pool, and 2/3 of forest total soil respiration results from root respiration. Information about root respiration is useful for evaluating implications of environmental change on soil carbon cycling, carbon sequestration and developing carbon dynamic model in forest ecosystems. However, not until recent years that the researches on tree root respiration attracts the ecologists. The primary purpose of this study was to determine seasonal dynamics, controlling factors and inter-stand difference of root respiration in a native forest of Castanopsis kawakamii (NF) and two plantations of Castanopsis kawakamii (CK) and Cunninghamia lanceolata (Chinese fir, CF) in sanming, Fujian, during a period of 2002~2003. Root respiration was separated from microbial respiration by trenching, and the rates were determined in situ utilizing the alkali sorption technique. Root respiration rates in the three forests showed a similar seasonal pattern with one single peak occurred during late spring or early summer and a minimum during dormant season, and varied from 157.76 to 480.40 mg CO_2/(m~2·h) in the NF, from 53.03 to 339.45 mg CO_2/(m~2·h) in the CK, and from 16.66 to 228.02 mg CO_2/(m~2·h) in the CF. In year 2002, a year representative of normal climate condition, root respiration was mainly controlled by soil temperature (at 5 cm depth) (R~2=0.52~0.72), and soil temperature and soil water content (at 0~10 cm depth) together could explain 81%~90% of variation in root respiration. In year 2003, a year with extremely low rainfall during June to October, soil temperature and soil water content together could explain only 24%~60% of variations in root respiration. The poor correlation of root respiration to soil temperature and soil water content together in year 2003 might be attributed to the acclimation mechanism of roots to the long dry season, during which root respiration remain in very low level similar to that in dormant season. Root respiration rate in the CF had the highest soil temperature and humidity sensitivity, followed by the CK and the NF. Annual CO_2 effluxes from root respiration ranged from 7.296 tC/(hm~2·a) in the NF to 4.470 tC/(hm~2·a) in the CK and 2.111 tC/(hm~2·a) in the CF in year 2002, and varied from 5.779 tC/(hm~2·a) in the NF to 3.557 tC/(hm~2·a) in the CK and 1.545 tC/(hm~2·a) in the CF in year 2003.. The contribution of root respiration to soil respiration peaked in May or June and minimized in winter season, and averaged 47.6%, 42.5% and 40.2% respectively in the NF, CK and CF.
【Fund】: 国家自然科学基金项目(30300272;30170770);; 高等学校优秀青年教师教学科研奖励计划资助项目~~
【CateGory Index】: Q945.19
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