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Advances in Earth Science  2007, Vol. 22 Issue (9): 976-986    DOI: 10.11867/j.issn.1001-8166.2007.09.0976
Articles     
Contributions of Litter-fall to Soil Respiration and Its Affacting Factors in Southern Subtropical Forests of China
DENG Qi1,2, LIU Shi-zhong1, LIU Ju-xiu1, MENG Ze1, ZHANG De-qiang1
1.South China Institute of Botany, Chinese Academy of Sciences,Guangzhou 510650,China;2.Graduate School, Chinese Academy of Sciences,Beijing 100039,China
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Abstract  

Three main types of Soil respirations(S+L and S) in southern subtropical forests in Dinghushan biosphere reserve were consecutively being monitored over 31 months by the approach of static chamber-gas chromatograph techniques. Research shows that: annual mean contribution rates of litter-fall to soil respiration in the monsoon evergreen broadleaf forest (BF), mixed broadleaf-coniferous forest (MF) and coniferous(pine) forest (PF) reached 27.82%、33.29%和36.35% respectively; Moreover, all three types of forests displayed the same seasonal dynamic features with the peaks contributions of them were from April to September, which accounts for 71.87%、61.89% and 70.39% of annual total contributions of litterfall to soil respiration respectively. Soil respiration(S+L) had an obviously positive relationship with the seasonal changes of litter-fall input(P<0.001; And soil water content had a significant impact on the contribution of litter-fall to soil respiration in the three types of forests (P<0.001); Soil temperature had positive correlativity with soil respiration flux, though it has no distinctive relationship with contribution of litter-fall to soil respiration; the contribution ratios of litter-fall to soil respiration on rainy days were 28.63%、38.20% and 40.12% respectively, which were significantly higher than those in the sunny days in the three types of forests.

Key words:  Soil respiration      Litter-fall      Contribution      Affacting factor.      Southern subtropical forest     
Received:  28 February 2007      Published:  10 September 2007
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DENG Qi, LIU Shi-zhong, LIU Ju-xiu, MENG Ze, ZHANG De-qiang. Contributions of Litter-fall to Soil Respiration and Its Affacting Factors in Southern Subtropical Forests of China. Advances in Earth Science, 2007, 22(9): 976-986.

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http://www.adearth.ac.cn/EN/10.11867/j.issn.1001-8166.2007.09.0976     OR     http://www.adearth.ac.cn/EN/Y2007/V22/I9/976

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