| Research Articles |
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| Influence of climate warming and nitrogen deposition on soil phosphorus composition and phosphorus availability in a temperate grassland, China |
| GuangNa ZHANG1,2,3, ZhenHua CHEN1, AiMing ZHANG1,2, LiJun CHEN1*, ZhiJie WU4 |
1 State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110164, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 Shandong Provincial Key Laboratory of Water and Soil Conservation & Environmental Protection, Linyi University, Linyi 276000, China;
4 Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China |
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Abstract Climate warming and nitrogen (N) deposition change ecosystem processes, structure, and functioning whereas the phosphorus (P) composition and availability directly influence the ecosystem structure under condi-tions of N deposition. In our study, four treatments were designed, including a control, diurnal warming (DW), N deposition (ND), and combined warming and N deposition (WN). The effects of DW, ND, and WN on P composition were studied by 31P nuclear magnetic resonance (31P NMR) spectroscopy in a temperate grassland region of China. The results showed that the N deposition decreased the soil pH and total N (TN) concentration but increased the soil Olsen-P concentration. The solution-state 31P NMR analysis showed that the DW, ND and WN treatments slightly decreased the proportion of orthophosphate and increased that of the monoesters. An absence of myo-inositol phosphate in the DW, ND and WN treatments was observed compared with the control. Furthermore, the DW, ND and WN treatments significantly decreased the recovery of soil P in the NaOH–EDTA solution by 17%–20%. The principal component analysis found that the soil pH was positively correlated with the P recovery in the NaOH–EDTA solution. Therefore, the decreased soil P recovery in the DW and ND treatments might be caused by an indirect influence on the soil pH. Additionally, the soil moisture content was the key factor limiting the available P. The positive correlation of total carbon (TC) and TN with the soil P composition indicated the influence of climate warming and N deposition on the biological processes in the soil P cycling.
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Received: 27 December 2012
Published: 10 April 2014
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| Fund: This study was supported by the National Natural Science Foundation of China (41171241) and the National Basic Research Program of China (2011CB403204). |
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Corresponding Authors:
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