Responses of decomposition of Phragmites australis litter to simulated temperature enhancement in the reclamed coastal wetland

GUAN Yue-zhang; LIU An-tian; ZHONG Qi-cheng; WANG Kai-yun

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GUAN Yue-zhang, LIU An-tian, ZHONG Qi-cheng, WANG Kai-yun. Responses of decomposition of Phragmites australis litter to simulated temperature enhancement in the reclamed coastal wetland[J]. Journal of East China Normal University (Natural Sciences), 2013, (5): 27-34.

Citation:

GUAN Yue-zhang, LIU An-tian, ZHONG Qi-cheng, WANG Kai-yun. Responses of decomposition of Phragmites australis litter to simulated temperature enhancement in the reclamed coastal wetland[J]. Journal of East China Normal University (Natural Sciences), 2013, (5): 27-34.

Citation:

GUAN Yue-zhang, LIU An-tian, ZHONG Qi-cheng, WANG Kai-yun. Responses of decomposition of Phragmites australis litter to simulated temperature enhancement in the reclamed coastal wetland[J]. Journal of East China Normal University (Natural Sciences), 2013, (5): 27-34.

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Responses of decomposition of Phragmites australis litter to simulated temperature enhancement in the reclamed coastal wetland

1.
Department of Environmemtal Science,East China Normal University,Shanghai 200062,China;
2.
Department of Life Sciences,East China Normal University,Shanghai 200062,China;
3.
Shanghai Key Laboratory of Urbanization Ecological Restoration,East China Normal University, Shanghai 200062,China

Received Date: 2012-07-01
Rev Recd Date: 2012-10-01
Publish Date: 2013-09-25

Abstract

Abstract

By using open-top growth chambers (OTC) to simulate short-term warming and mesh bags,the study was carried out in the reclaimed wetland in the east Chongming tidal flat. The effects of short-term simulated warming （1.9840.7） ℃ on the decomposition of Phragmites australis litter were studied and the changes of correlations between decomposition rate and environmental parameters were analysed.The results are as follows: ① stem decomposition rates in OTC plots and CG plots are 49.20% and 45.11%, and leaves decomposition rates are 63.52% and 58.53%, respectively, which shows that warming has increased the decomposition rates; ② stems average decomposition coefficients (K) in OTC plots and CG plots are 0.028 and 0.027,while the average decomposition coefficients of leaves are 0.093 and 0.080, respectively, which shows that the increment of leaves K is bigger than stems K; ③ the order of correlation degree between environmental factors and decomposition rate is: 1.2 m air temperature 0～5 cm soil temperature 0～5 cm soil moisture,and the correlation coefficient between leaves decomposition rate and 1.2 m air temperature is biggest which is 6.43%. In summary, air temperature is the key factor affecting the Phragmites australis litter decomposition; meanwhile warming not only improves litters decomposition rates, but also changes the relevance between decomposition rate and environmental factors.
- wetland,
- Phragmites australis,
- litter decomposition,
- temperature enhancement,
- open-top chambers (OTC)

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References(1)

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