Comparison of phosphorus sorption characteristics in the soils of riparian buffer strips with different land use patterns and distances from the shoreline around Lake Chaohu
- 100 Downloads
The construction of riparian buffer strips has become increasingly important due to the effective phosphorus (P) retention of the strips, thus preventing eutrophication in freshwater ecosystems. The key mechanism is P sorption in soils. To provide some suggestions for increasing the sorption ability of P, the relationships between P sorption behavior and both land use patterns and distance from the shoreline were determined.
Materials and methods
In April, July, and October 2013, field investigations were carried out along the shoreline of Lake Chaohu. Eleven sections, including 36 sampling sites at different distances from the shoreline, were chosen, and these sections contained different types of riparian buffer strips, such as grassland, farmland, forest, wetland, and forest/grassland. The P species, sorption parameters, and dominant vegetation species were analyzed.
Results and discussion
The total P (TP) and P sorption maximum (Qmax) showed no recognizable seasonal variation and were closely correlated with the distance from the shoreline. The further the distance from the shoreline, the higher the TP and Qmax values, suggesting that soil traits could determine the P sorption extent. However, the Olsen-P content and equilibrium P concentration (EPC0) fluctuated greatly, with the peak occurring in spring and the minimum occurring in summer in the majority of the sampling sites. In addition, positive relationships existed between the TP content and the Qmax value as well as the Olsen-P content and the EPC0 value. Canonical correlation analysis (CCA) further showed that the Olsen-P content and EPC0 values were closely related to the dominant vegetation species, indicating that land use patterns played a decisive role in regulating the P sorption strength and the level of available P.
To effectively adsorb P (increase Qmax) and prevent P leaching (reduce the EPC0), we recommend changing the land use patterns (more constructed wetlands and forests with grass) in riparian buffers.
KeywordsLake Chaohu Phosphorus sorption Phosphorus species Riparian buffer strips
We thank Siyang Wang, Zijun Zhou, Jian Xiao, and Yao Zhang for their help with sampling.
This work was supported by grants from the National Natural Science Foundation of China (41877381; 41573110; 41611540341), the Major Science and Technology Program for Water Pollution Control and Treatment (2017ZX07603), and the State Key Laboratory of Freshwater Ecology and Biotechnology (2016FBZ07).
- Andersen DS, Helmers MJ, Burns RT (2015) Phosphorus sorption capacity of six Iowa soils before and after five years of use as vegetative treatment areas. Appl Eng Agric 31(4):611–620Google Scholar
- Ding Z, Peng H, Gao S (2011) Analysis and suggestion of soil location monitoring data in Chaohu City. Anhui Agri Sci Bull 17(13):105–107Google Scholar
- Giesler R, Andersson T, Lövgren L, Persson P (2005) Phosphate sorption in aluminum- and iron-rich humus soils. Soil Sci Soc Am J 69:77–86Google Scholar
- Kyehan L, Isenhart TM, Schultz RC, Mickelson SK (2000) Multispecies riparian buffers trap sediment and nutrients during rainfall simulations. J Environ Qual 29(4):1200–1205Google Scholar
- Moradi N, Sadaghiani MHR, Sepehr E (2012) Effects of low-molecular-weight organic acids on phosphorus sorption characteristics in some calcareous soils. Turk J Agric For 36(4):459–468Google Scholar
- Olsen SR, Cole CV, Watanabe FS, Dean LA (1954) Estimation of available phosphorus in soils by extraction with sodium bicarbonate. In: USDA circular. USDA, Washington DC, p 939Google Scholar
- Ter Braak CJF, Šmilauer P (2002) CANOCO reference manual and CanoDraw for Windows user’s guide: software for canonical community ordination (version 4.5). Microcomputer power, Ithaca, N.Y., USAGoogle Scholar
- Wang X, Chang L, Li H, Zhang Q (2011) Study on community characteristics and soil properties of typical vegetations in Chaohu hill region. Soils 43(6):981–986Google Scholar
- Xiao WJ, Song CL, Cao XY, Zhou YY (2012) Effects of air-drying on phosphorus sorption in shallow lake sediment, China. Fresenius Environ Bull 21(3A):672–678Google Scholar
- Zhou C, Zhou Y, Chen X, Liu Y, Cao X, Song C (2011) Linkage between land use patterns and sediment phosphorus sorption behaviors along shoreline of a Chinese large shallow lake (Lake Chaohu). Knowl Manag Aquat Ec 34(403):81–85Google Scholar