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Moss lore. Moss NPP is inversely proportional to vascular plant production Moss NPP ≥ black spruce in boreal forest. Hypotheses. Moss NPP and vascular NPP are inversely related Moss NPP increases positively with vascular ANPP up to a critical value (e.g., canopy closure), and then decrease.

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moss lore
Moss lore
  • Moss NPP is inversely proportional to vascular plant production
  • Moss NPP ≥ black spruce in boreal forest
hypotheses
Hypotheses
  • Moss NPP and vascular NPP are inversely related
  • Moss NPP increases positively with vascular ANPP up to a critical value (e.g., canopy closure), and then decrease.

Moss NPP (g m-2 yr-1)

Moss NPP (g m-2 yr-1)

Vascular ANPP (g m-2 yr-1)

the first step published moss npp values for tundra and boreal forest

200

150

Moss NPP (g m-2 yr-1)

100

BIOME

Boreal

50

Tundra

0

Boreal

Tundra

BIOME

The first step: published moss NPP values for tundra and boreal forest

20

0.4

Boreal AK and CN = 39

Tundra AK = 8

Total studies = 47

15

0.3

Count

10

Proportion per Bar

0.2

5

0.1

0

0.0

0

50

100

150

200

Moss NPP (g m-2 yr-1)

alaska upland tundra and boreal forest
Alaska: upland tundra and boreal forest

200

150

Moss NPP (g m-2 yr-1)

100

50

BIOME

Boreal

0

Tundra

0

100

200

300

400

500

Vascular ANPP (g m-2 yr-1)

alaska upland tundra and boreal forest1
Alaska: upland tundra and boreal forest

200

Tundra slope = 0.5 (R2=0.51)

Boreal slope = 0.1 (R2=0.40)

Slopes sig. diff. @ P = 0.02

150

Why?

Moss NPP (g m-2 yr-1)

100

50

BIOME

Boreal

0

Tundra

0

100

200

300

400

500

Vascular ANPP (g m-2 yr-1)

alaska upland tundra and boreal forest2

Shaver and Chapin 1991

(boreal multiplier?)

Ruess et al. 2007 (most precise?)

Alaska: upland tundra and boreal forest

200

150

Moss NPP (g m-2 yr-1)

100

50

BIOME

Boreal

0

Tundra

0

100

200

300

400

500

Vascular ANPP (g m-2 yr-1)

canada wetlands and uplands

Position

U

Upland

Wetland

W

Canada: wetlands and uplands

200

W

What about wetlands?

W

150

W

Moss NPP (g m-2 yr-1)

100

W

U

50

U

U

0

0

100

200

300

400

Understory ANPP (g m-2 yr-1)

alaska moss vs spruce

80

70

60

50

Moss NPP (g m-2 yr-1)

40

30

20

10

0

100

200

300

400

Spruce ANPP (g m-2 yr-1)

Alaska: moss vs. spruce

No relationship, but

spruce is generally > moss

conclusions
Conclusions
  • Positive relationship between moss and vascular NPP
  • More support for H2 than H1, but…
    • Small sample size; missing wetlands, other veg. types
    • Variation in methods of measuring moss NPP may make comparisons difficult
    • Future: find more data, explore methods for measuring moss NPP, use meta-analytical techniques
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