Citation:

j.1365-2486.2012.02754.x

Name: (Table 3) Leaf area and leaf nitrogen for deciduous, evergreen, forb and graminoid species at Barrow, Svalbard and Zackenberg
Published: 2012
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Arctic vegetation is characterized by high spatial variability in plant functional type (PFT) composition and gross primary productivity (P). Despite this variability, the two main drivers of P in sub-Arctic tundra are leaf area index (LT) and total foliar nitrogen (NT). LT and NT have been shown to be tightly coupled across PFTs in sub-Arctic tundra vegetation, which simplifies up-scaling by allowing quantification of the main drivers of P from remotely sensed LT. Our objective was to test the LT-NT relationship across multiple Arctic latitudes and to assess LT as a predictor of P for the pan-Arctic. Including PFT-specific parameters in models of LT-NT coupling provided only incremental improvements in model fit, but significant improvements were gained from including site-specific parameters. The degree of curvature in the LT-NT relationship, controlled by a fitted canopy nitrogen extinction co-efficient, was negatively related to average levels of diffuse radiation at a site. This is consistent with theoretical predictions of more uniform vertical canopy N distributions under diffuse light conditions. Higher latitude sites had higher average leaf N content by mass (NM), and we show for the first time that LT-NT coupling is achieved across latitudes via canopy-scale trade-offs between NM and leaf mass per unit leaf area (LM). Site-specific parameters provided small but significant improvements in models of P based on LT and moss cover. Our results suggest that differences in LT-NT coupling between sites could be used to improve pan-Arctic models of P and we provide unique evidence that prevailing radiation conditions can significantly affect N allocation over regional scales.

Project(s):

International Polar Year (2007-2008) (IPY)

Coverage:

Median Latitude: 74.891020 * Median Longitude: -53.069833 * South-bound Latitude: 71.300000 * West-bound Longitude: -156.667000 * North-bound Latitude: 78.900000 * East-bound Longitude: 18.010000

Minimum Elevation: 7.0 m * Maximum Elevation: 7.0 m

Event(s):

Barrow_plain * Latitude: 71.300000 * Longitude: -156.667000 * Elevation: 7.0 m * Location: Barrow, Alaska, USA * Method/Device: Biological sample (BIOS)

Svalbard * Latitude: 78.900000 * Longitude: 18.010000 * Location: Svalbard * Method/Device: Multiple investigations (MULT)

Zackenberg (ZAC) * Latitude: 74.473060 * Longitude: -20.552500 * Recovery: 3.3 m * Location: Zackenberg, Northeast Greenland * Method/Device: Multiple investigations (MULT)

Comment:

Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	Area/locality	Area		Street, Lorna E
2	Latitude of event	Latitude
3	Longitude of event	Longitude
4	Species	Species		Street, Lorna E
5	Sample amount	N	#	Street, Lorna E
6	Vegetation type	Vegetation type		Street, Lorna E	D = deciduous, E = evergreen, F = forb, G = graminoid
7	Nitrogen per area	N area	g/m²	Street, Lorna E	per leaf area
8	Nitrogen, standard deviation	N std dev	±	Street, Lorna E	N/area
9	Nitrogen, organic	N org	mg/kg	Street, Lorna E	per leaf mass
10	Nitrogen, standard deviation	N std dev	±	Street, Lorna E	N/mass
11	Leaf area, specific, per mass dry weight	LA spec DW	mm²/mg	Street, Lorna E
12	Standard deviation	Std dev	±	Street, Lorna E	leaf area

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

300 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Area	2 Latitude	3 Longitude	4 Species	5 N [#]	6 Vegetation type (D = deciduous, E = evergreen,...)	7 N area [g/m²] (per leaf area)	8 N std dev [±] (N/area)	9 N org [mg/kg] (per leaf mass)	10 N std dev [±] (N/mass)	11 LA spec DW [mm²/mg]	12 Std dev [±] (leaf area)
Barrow	71.30	-156.67	Salix phlebophylla	7	D	1.76	0.09	23300	1800	13.2	0.3
Barrow	71.30	-156.67	Stellaria species	9	F	1.43	0.17	22400	1600	17.4	2.2
Barrow	71.30	-156.67	Saxifraga cernua	8	F	0.95	0.07	19400	1300	20.6	1.0
Barrow	71.30	-156.67	Dupontia fisheri	15	G	2.21	0.17	23100	1000	11.2	0.8
Barrow	71.30	-156.67	Eriophorum scheuchzeri	10	G	2.51	0.23	30300	1900	12.5	0.6
Barrow	71.30	-156.67	Other grasses	9	G	1.73	0.14	19300	1000	11.5	0.6
Svalbard	78.90	18.01	Salix polaris	34	D	1.75	0.05	24200	800	13.9	0.4
Svalbard	78.90	18.01	Dryas octopetala	21	E	2.68	0.13	20200	600	8.1	0.8
Svalbard	78.90	18.01	Cassiope tetragona	6	E	2.16	0.20	19800	1200	4.6	0.2
Svalbard	78.90	18.01	Polygonum viviparum	35	F	2.06	0.07	30800	300	15.5	0.5
Svalbard	78.90	18.01	Other forbs	20	F	1.88	0.20	24900	1100	15.1	1.3
Svalbard	78.90	18.01	Equisetum species	30	P	3.14	0.18	28400	1300	9.5	0.5
Svalbard	78.90	18.01	Carex species	9	G	1.90	0.17	19300	1300	10.6	0.9
Svalbard	78.90	18.01	Dupontia fisheri	5	G	2.09	0.20	16100	1300	7.8	0.2
Svalbard	78.90	18.01	Other graminoids	32	G	2.32	0.10	21600	600	9.7	0.3
Zackenberg	74.47	-20.55	Salix arctica	58	D	2.18	0.08	30900	1000	14.4	0.6
Zackenberg	74.47	-20.55	Arctostaphylos alpina	14	D	2.87	0.20	31100	2000	11.1	0.6
Zackenberg	74.47	-20.55	Vaccinium uliginosum	14	D	1.44	0.05	24600	1300	16.2	1.5
Zackenberg	74.47	-20.55	Dryas species	23	E	2.12	0.09	16000	700	8.0	0.5
Zackenberg	74.47	-20.55	Cassiope tetragona	22	E	2.15	0.19	23200	600	5.8	0.4
Zackenberg	74.47	-20.55	Polygonum viviparum	37	F	4.01	1.09	38300	1000	15.9	1.3
Zackenberg	74.47	-20.55	Stellaria species	16	F	2.15	0.57	27000	1500	17.6	1.9
Zackenberg	74.47	-20.55	Pedicularis species	8	F	2.40	0.23	36200	3700	16.1	2.5
Zackenberg	74.47	-20.55	Equisetum species	12	P	2.62	0.10	27300	1900	10.4	0.5
Zackenberg	74.47	-20.55	Carex species	8	G	2.17	0.22	24900	1900	11.8	0.8
Zackenberg	74.47	-20.55	Dupontia species	6	G	2.45	0.21	21300	2700	8.6	0.7
Zackenberg	74.47	-20.55	Eriophorum species	6	G	2.47	0.12	25900	1600	10.7	0.9
Zackenberg	74.47	-20.55	Other graminoids	28	G	4.47	2.03	24900	1400	11.1	1.1
Zackenberg	74.47	-20.55	Other grasses	18	G	5.07	1.69	28600	1600	8.2	0.9
Zackenberg	74.47	-20.55	Other sedges	5	G	2.25	0.26	24900	2100	11.5	1.2