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Existence Feature of Nitrogen and Phosphorus in the Two Type Sediment Ponds for a Postichopus Japonicus Breeding

Author: WangHuiYi
Tutor: XingRongLian
School: Yantai University
Course: Hydrobiology
Keywords: A postichopus japonicus pond sediment nitrogen phosphorus extracellularenzyme
CLC: S968.9
Type: Master's thesis
Year: 2013
Downloads: 4
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Abstract


In present paper, water samples in surface and bottom, sediments samples in the upper (0～2cm) and lower (3～5cm) layers near the inlet, middle area and the outlet in sandy and silty sediment ponds for A postichopus japonicus breeding were collected from March to November in2011, respectively. The contents of total nitrogen (TN), total phosphorus (TP), ammonia nitrogen (NH4+-N), nitrate nitrogen (NO3--N), nitrite nitrogen (NO2--N) and soluble reactive phosphorus (PO43--P) in water were assayed. Besides, TN and TP contents, alkaline phosphatase (APA) activity, urease and catalase activity in sediments were assayed respectively. Moreover, the existing features of nitrogen and phosphorus were analyzed. The results are as follows:(1) In sandy sediment pond water, TN contents ranged from (0.19±0.03) mg/L to (0.28±0.02) mg/L, in which the DIN account for16.26%to36.57%. The DIN occurred mainly with the form of NO3--N, which account for44.4%to92.7%. Besides, NH4+-N was the second, NO2--N the lowest. TP contents ranged from (0.02±0.01) mg/L to (0.05±0.02) mg/L, in which the PO43--P account for23.6%-54.2%.In silty sediment pond water, TN contents ranged from (0.14±0.02) mg/L to (0.39±0.02)mg/L, in which the DIN account for75.83%to93.90%, The DIN occurred mainly with the form of NO3--N, which account for44.4%to92.7%. Besides, NH4+-N was the second, NO2--N the lowest. TP contents ranged from (0.02±0.00) mg/L to (0.04±0.00) mg/L, in which the PO43--P account for17.1%to39.4%. TN contents were higher with a larger range of variation in sandy sediment pond water, in which TP contents were highest during the May to July, increased first and then decreased in overall. The one-way ANOVA showed that there was no significant difference in NH4+-N contents between the sandy and the silty sediment pond water from March to July (p>0.05), but a significant difference occurred from August to November (p<0.01). Finally, NO2--N contents showed a similar variation trend in the two sediments pond water, while the PO43--P contents were significant higher in the sandy sediment pond water.(2)There was no significant variation between the surface and bottom water in TN, NO3--N, NO2--N and DIN contents. NH4+-N contents were higher during the March to June and lower in the other months in the sandy sediment surface water. Besides, the vertical distribution of NH4+-N contents was not obvious in the silty sediment pond water. The higher TP contents alternated between the surface and the bottom water both in the sandy and the silty sediments pond water. The PO43--P contents was higher in the surface sandy sediment pond water during the initial investigating period, that in the silty sediment pond water had no significant variation at the same time.(3) The TN, NH4+-N, NO3--N, NO2--N and PO43--P contents showed no obvious rule in horizontal distribution. However, there was a significant difference among the three areas of inlet, outlet and the middle of the two sediments pond in TP contents.(4)The monthly variation of DIN/P ratio ranged from4.2to16.9in the sandy sediment pond water, in which the nitrogen was the limiting factor. In addition to this, the DIN/P ratio ranged from8.8to59.5in the silty sediment pond water, in which the phosphorus and nitrogen was the limiting factor during the March to June and the July to November respectively.(5) TN contents ranged from (0.16±0.05) mg/g to (0.29±0.03) mg/g in sandy sediment, that in silty sediment ranged from (0.13±0.06) mg/g to (0.67±0.09) mg/g. TN contents in silty sediment were in an upward trend in overall. The one-way ANOVA showed that there was no significant difference in the TN contents between the sandy and the silty sediments from March to June (p>0.05), but a significant difference occurred from July to November (p<0.01). TP contents ranged from (0.02±0.02) mg/g to (0.09±0.07) mg/g in sandy sediment, that in silty sediment ranged from (0.50±0.02) mg/g to (0.72±0.04) mg/g. In the two sediments, the TP contents decreased first and then increased during the investigating period, reached the lowest in August. TN and TP contents in upper sediment were slightly higher than that in lower sediment, While the difference between the two layers was not significant (p>0.05). The TN and TP contents were both lowest in the two sediments near the inlet area. There was no big difference on TN contents in sediments near the middle and the outlet areas. TP contents in the middle area were both higher than that in the outlet area during the early and late investigating period. Moreover, the difference turned out to be bigger in the late investigating period.(6) From May to November, the activity of APA was higher, that was lower in March and April in sandy sediment. Besides, the urease activity showed an increasing trend in overall. In silty sediment, the APA activity presented a trend of growth, while the urease activity was always at lower level in overall. Moreover, the catalase activity showed similar variation trend both in the two sediments. In sandy sediment, the APA activity in upper sediment was significant higher, whose variation trend was significant different from that in lower. The urease activity showed an increasing trend both in the two sediments, between which the higher alternate. Ultimately, the higher catalase activity alternated between the upper and lower. In silty sediment, all the activities of the APA, urease and catalase were higher in upper. The horizontal distribution of the three enzyme activities had no rules.Comprehensively, the sandy sediment may be more beneficial for healthy and sustainable development of A postichopus japonicus breeding. The silty sediment could have internal pollution risks because of higher N and P accumulation contents.

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CLC: > Agricultural Sciences > Aquaculture, fisheries > Aquaculture technology > A variety of seafood, animal and plant breeding > Other seafood, animal breeding
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