| 生物土壤与生态 |
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| Litterfall and Decomposition of Biomass and Soil Respiration of Artemisia Ordosica Communities in Arid Region |
| WANG Hai-tao1, ZHANG Yin-tai2, HE Xing-dong1, GAO Yu-bao1, XUE Ping-ping1, ZHANG Ning1 |
| 1.College of Life Sciences, Nankai University, Tianjin 300071, China; 2.College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China |
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Abstract Both the litterfall and decomposition of aboveground biomass and the soil respiration affect the eluviations and deposition of calcium carbonate in aeolian sand substrates. To study the formation of calcium carbonate in soil of Artemisia ordosica community in Tengger Desert, this paper focused on the litterfall and decomposition of annual biomass and the soil respiration in communities of A. ordosica. The results indicated that the annual biomass in fixed sand dune [(41.51±1.76)g\5m-2] was significantly higher than that in semi-fixed sand dune [(19.32±0.64)g·m-2], and the annual litterfall [(32.89±1.34)g·m-2] was also significantly higher than that in semi-fixed sandy land [(19.32±0.64)g\5m-2] . The decomposition rate of the litterfall of A. ordosica all exceeded 0.6692 g·g-1·a-1 in different sites, and those litterfall might need 4.48 years to reach the peak value of decomposition rate, theoretically. Statistical analysis suggested that there were significant differences among soil respiration rates on A. ordosica semi-fixed sand dune, A. ordosica fixed sand dune, and A. ordosica+ A. frigida fixed sand dune, and the lowest soil respiration rate in A. ordosica + A. frigida fixed sand dune [(7.37±1.07)mg\5m-2\5h-1] might be related to high pH value of soil solution and low activity of soil dehydrogenase. The higher fixed degree of the A. ordosica sand dune implies the more litterfall, the more released Ca2+; the lower soil respiration rate, the higher soil pH value, all of them will promote the formation of calcium carbonate in soil.
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Received: 07 September 2006
Published: 20 May 2007
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2007, Vol. 27 
