Variation in summer nitrogen and phosphorus uptake among Siberian headwater streams

Figures & data

Fig. 1  Map showing location of experimental streams within the Kolyma River watershed in north-eastern Siberia.

Table 1 Mean background values for relevant physical and chemical variables for the five streams used in this study.

	Yedoma			Floodplain
	DVY	TDO	Y4	FPS1	FPS2
Physical
Discharge (L s^−1)	3.5	2	1.07	3.6	2.5
Width (m)	0.52	0.45	0.47	1.02	0.95
Depth (m)	0.08	0.04	0.06	0.09	0.07
Velocity (m s^−1)	0.01	0.01	0.03	0.02	0.03
Order	1	1	2	1	1
DO %Sat^a	71.8	60.6	90.3	53.9	79.3
Temp (C)	10.5	9.5	4.6	9.2	9.2
Cond (µS m^−1)	23	27	21	32	35
Chemical
DOC (mg/L)	18	16.4	18.1	13	14
DON (mg/L)	0.53	0.62	0.56	0.56	0.79
DOC:DON	39.6	36	37.7	27	20.7
NH4 (µg/L)	21	29	30	18	60
NO3 (µg/L)	10	12	5	9	10
PO4 (µg/L)	13.7	32.6	34.7	9.6	18.5
NH4:NO3	2.1	2.4	6	2	6
Molar iN:iP	5	2.8	2.2	6.2	8.4

^aPercent saturation of dissolved oxygen.

Fig. 2  Nutrient spiralling parameters (S _W , U, v _f ) for (a–c) N and P and (d–f) their ratios in upland and floodplain streams. Error bars are ±1 standard error.

Fig. 3  Relationships between transient storage indices (A _s /A and t _stor ) and (a, b) discharge and (c, d) v _fP . Error bars are ±1 standard error.

Fig. 4  Biological uptake of P by floodplain and upland sediments. Error bars are ±1 standard error.