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Chinese Journal of Applied Ecology ›› 2002, Vol. ›› Issue (6): 709-714.

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Influence of environmental factors on the decomposition of organic carbon in agricultural soils

HUANG Yao, LIU Shiliang, SHEN Qirong, ZONG Lianggang   

  1. College of Resource and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095
  • Received:2000-04-29 Revised:2000-08-27 Online:2002-06-15

Abstract: To quantitatively investigate the effects of environmental factors on organic carbon decomposition,CO2-Cwas measured from the incubation of wheat and rice straw as well as their roots mixed with a paddy soil over a 90-day period. Results showed that decomposition of the straw carbon was faster than that of the roots. Amount of CO2-Creleased from the organic matter decomposition was quantitatively related to its properties of C/Nratio. Increase of temperature within a lower temperature range enhanced greatly the decomposition while such an enhancement weakened within a higher temperature range. Under the moist condition,the temperature coefficient of organic carbon decomposition declined exponentially with the incubation time. The temperature coefficient did not significantly decrease with the time for the submerged condition after one-week incubation. The effect of water status showed that the decomposition at the water contents of 300g穔g-1 and 500g穔g-1 was faster than that under the treatments of 200g穔g-1 and the submerged. Within the first month period of incubation,carbon amount released from the incubation of wheat straw was negatively related to the clay fraction of the soils.

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