Soil phosphorus forms and their variations in depressional and riparian freshwater wetlands (Sanjiang Plain, Northeast China)

Relationships of phosphorus fractions to organic carbon content in surface soils in mature subtropical forests, Dinghushan, China

“…High annual temperature (218C) and rainfall (1900 mm) in the study area promote soil weathering. It is notable that more than half of the soil total P in the study soils existed within the soil residual P (Pi + Po) fractions, which are bound with Al and Fe oxides and are either very weakly available or unavailable for plant uptake (Chang and Jackson 1957;Chen et al 2003;Wang et al 2006). This result suggests that the large proportion of soil P occluded with Al and Fe oxides may be an important factor in the low P availability and P limitation on the growth of plants and microbes in the study area (Hou et al 2012;Liu et al 2012), in addition to the high atmospheric N deposition level and the low-P parent rock (Hou et al 2012).…”

“…However, some studies have suggested that an accumulation of soil organic C (or organic matter) may decrease soil P availability due to the inclusion of P in organic form (Huang et al 2012;Schlesinger et al 1998). For example, Schlesinger et al (1998) proposed that P was limiting plant growth in soil at an early stage of development (110 years) on Rakata Island, Indonesia, perhaps as a result of the observed rapid accumulation of organic P. Wang et al (2006) found that soil organic C concentration was positively related to the concentrations of soil soluble organic-P fractions, whereas it was negatively related to the concentrations of soil soluble inorganic-P fractions in depressional and riparian freshwater wetlands in North-east China. Further studies on the relationships between soil organic C and P fractions are needed to clarify the relationship between soil organic C accumulation and soil P availability, which has important implications in understanding the limitation P places on the storage of C in terrestrial ecosystems (Wang et al 2010;Kirkby et al 2011).…”

Spatial variability of soil carbon, nitrogen, and phosphorus content and storage in an alpine wetland in the Qinghai - Tibet Plateau, China

“…conversion of natural to agricultural or pasture ecosystems, drainage of wetlands) are among major factors affecting greenhouse gases emissions. It has become clearer that C and N storage in wetlands shows a significant decrease due to the conversion of wetlands to agricultural ecosystems (Lal 2004;Wang et al 2004Wang et al , 2006Zhang et al 2008), but that storage will increase with increasing time after abandonment of cultivated wetland (Zhang et al 2007). Additionally, different landscape, land-use (soil management), and hydrological patterns might affect N (Bai et al 2007) and P transfers and forms (Tiessen 1995), which can affect water quality of adjacent rivers or lakes (Mitsch and Gosselink 2000;Bai et al 2007) and possible successional changes (Prusty et al 2009).…”

“…Generally, human activity has adversely affected global C, N, and P cycles, and contributed to an alteration of climate that will generate discernible feedbacks to all organisms and ecosystems on the Earth (Mitsch and Gosselink 2000; Wang et al 2006;He et al 2008). Therefore, understanding the store and storage potential of C, N, and P helps us understand how ecosystems would respond to natural and anthropogenic disturbances under different management strategies (He et al 2008).…”

Characteristics of the microbial communities in the integrated vertical-flow constructed wetlands

“…They perform many important biogeochemical functions in watersheds due to their unique location (Wang et al, 2006). They have been found to be useful in remediating environment contaminated with biochemical oxygen demand (BOD), total suspended solid (TSS), nitrogen and phosphorus as well as various organic pollutants or metal oxides, or even pathogens (Thurston et al, 2001).…”