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| Seasonal dynamics of soil phosphorus contents and stocks in Suaeda salsa wetlands in the intertidal zone of the Yellow River Delta, China |
| Received:December 06, 2018 |
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| KeyWord:soil phosphorus;Suaeda salsa wetlands;Yellow River Delta;temporal and spatial variation |
| Author Name | Affiliation | E-mail | | YU Zi-bo | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | | | ZHUANG Tao | Jinan Environmental Research Academy, Jinan 250102, China | | | BAI Jun-hong | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | junhongbai@163.com | | YU Lu | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | | | WANG Wei | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | | | ZHANG Shu-yan | Yellow River Estuary Management Station of Yellow River Delta National Nature Reserve, Dongying 257000, China | |
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| Abstract: |
| Soil samples at both 0~10 cm and 10~20 cm soil layers were collected in summer, autumn, and spring to investigate temporal and spatial dynamics of soil phosphorus in Suaeda salsa wetlands in the intertidal zone of the Yellow River Delta. Our results showed that variations in soil total phosphorus (TP), available phosphorus (AP) and AP/TP ratios were similar, showing high temporal heterogeneity, with a V-shaped temporal distribution, where their values were low in autumn and high in summer and spring. Total phosphorus levels in wetland soils were higher than the lowest threshold of ecotoxicity (600 mg·kg-1), but the AP/TP ratios were lower than the threshold of bioavailability of phosphorus (2%). Total phosphorus stocks in wetland soils decreased seasonally following the order summer, autumn, and spring, and the available phosphorus stocks also exhibited a V-shaped distribution. No significant differences in contents and stocks of soil total phosphorus and available phosphorus were observed between 0~10 cm and 10~20 cm soil layers. Soil total phosphorus had significant positive correlations with soil water content (P<0.05), and Al and Mg contents (P<0.01). There was a significant negative correlation between total phosphorus and soil salinity (P<0.05). Available phosphorus was significantly correlated with soil water content and bulk density (P<0.05). However, no significant correlations were observed between soil phosphorus and soil organic matter and soil pH (P>0.05). Generally, there was no large vertical variability of soil phosphorus in the Yellow River Delta, but an obvious seasonal variability was observed, and soil phosphorus contents were clearly related to soil aluminum-magnesium compounds, soil salinity, and water content. |
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