Distribution and Bioavailability of Nitrogen and Phosphorus Species in the Sediments from Shiwuli Stream in Lake Chaohu
In order to learn the distribution and bioavailability of nitrogen（N） and phosphorus（P） species in the sediments of Shiwuli Stream,pouring into Lake Chaohu,seven sediment cores were collected along the stream,and then a total of 41 samples for the sediment cores were sliced in-situ with a thickness of 10 cm.The contents of ammonia nitrogen（NH＋4-N）,nitrate nitrogen（NO-3-N）,exchangeable P（Ex-P）,Al-bound P（Al-P）,Fe-bound P（Fe-P）,occluded P（Oc-P）,Ca-bound P（Ca-P）,detrital apatite P（De-P）,organic P（Or-P） as well as total nitrogen（TN） and total phosphorus（TP） were measured by chemical extraction methods.The researches on spatial distribution,correlation and bioavailability of nitrogen and phosphorus species were conducted according to the analyzed data.The results show that the spatial distribution of nitrogen and phosphorus species contents in the sediments of Shiwuli Stream is characterized by some regularity,and notable correlations between the major nitrogen and phosphorus forms are displayed as well.Generally,in the sediment layers of 0-10 cm,10-20 cm,20-30 cm,30-40 cm,40-50 cm and 50-60 cm,the average ratios of bio-available nitrogen content（the sum of NH＋4-N and NO-3-N） to TN are 8.17%,11.88%,7.99%,8.44%,8.97% and 20.06%,respectively,while the mean ratios of bio-available phosphorus content（the sum of Ex-P,Al-P and Fe-P） to TP are 50.18%,49.12%,42.41%,34.11%,32.71% and 39.55%,respectively.
nitrogen and phosphorus speciessedimentbioavailabilitynutrient elementLake Chaohu
NETL
NSTL
万方数据
维普
