Spatial distribution of inorganic nitrogen contents of marsh soils in a river floodplain with different flood frequencies from soil-defrozen period

Abstract

Contents of inorganic nitrogen (NH4(+)-N and NO3(-)-N) in soil profiles were measured in five typical zones ( including permanently flooded floodplain(B), 1-year floodplain (O), 5-year floodplain (F),10-year floodplain (T), and 100-year floodplain (H) )from Huolin River floodplain in Erbaifangzi, Jilin Province of China, in the soil-defrosted period (Mayof 1999). Contour maps and profile maps were constructed to describe the spatial distributions of NH4(+)-N and NO3(-)-N) in order to identify the influences of flood frequencies on them. Results showed that NH4(+)-N generally increased with depth in soil profiles from the five areas, but NH4(+)-N contents in T or H areas significantly differed from those in other areas. For NO3(-)-N, with the exception that there was a significant cumulative peak (6.77 +/- 0.08 mg kg(-1)) at 15-cm depth (10-20 cm) in B area, no significant difference was observed between NO3(-)-N contents in soil profiles from the other four areas. The horizontal distributions of NH4(+)-N and NO3(-)-N in top soils (0-10 cm) were different in the five areas,which were greatly influenced by flood frequencies. The highest content of NH4(+)-N or NO3(-)-N did not appear in B area but in the floodplain with certain flood frequency. For example, NH4(+)-N content (16.81 mg kg-(1)) in 5-year floodplain wetland was highest, and the highest content of NO3(-)-N(1.69 mg kg(-1)) appeared in 1-year floodplain wetland. In addition, NH4(+)-N contents were significantly correlated with soil pH, and NO3(-)-N contents had significant correlation with inorganic carbon, but there were no significant correlations between inorganic nitrogen and other selected soil properties.

Plant Species Richness Affected Nitrogen Retention and Ecosystem Productivity in a Full‐Scale Constructed Wetland

“…Our finding is consistent with the literature reporting higher nitrification rates in communities with higher plant SR [1,22]. Meanwhile, plants can greatly contribute to N removals in CWs by affecting nitrification and denitrification intensity in the root zones [31][32][33][34].…”

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

“…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). …”

Patterns and bioavailability of soil nutrients and carbon across a gradient of inundation frequencies in a lowland river channel, Murray–Darling Basin, Australia

“…The pattern and frequency of inundation may also be important in nutrient dynamics; frequent inundation can reduce a soils ability to retain P (Kerr et al, 2010) and cause the loss of N through coupled nitrification-denitrification (Baldwin and Mitchell, 2000;Bai et al, 2007).…”