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Nitrogen addition and harvest frequency rather than initial plant species composition determine vertical structure and light interception in grasslands.

Petersen U, Isselstein J - AoB Plants (2015)

Bottom Line: In biodiversity experiments based on seeded experimental communities, species richness and species composition exert a strong influence on canopy structure and can lead to an improved use of aboveground resources.However, the allocation of biomass in response to cutting and fertilization differed among the sward types.Management had a much stronger influence on structure and light interception than plant species composition in this grassland experiment.

View Article: PubMed Central - PubMed

Affiliation: Department of Crop Sciences, University of Göttingen, Von-Siebold-Str. 8, D-37075 Göttingen, Germany Present address: Johann Heinrich von Thünen Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries, Institute of Climate-Smart Agriculture (AK), Bundesallee 50, D-38116 Braunschweig, Germany Ute_Petersen@gmx.net.

No MeSH data available.


Related in: MedlinePlus

Means of LAI (leaves) and light intensity in relation to cumulative LAI (leaves) in the experimental treatments in July 2009 grouped by management regime (A = 1x, B = 1NPK, C = 3x, D = 3NPK). The sloping curves show the light intensity from above the canopy (0 % LAI) in 10 cm steps down to the ground (100 % LAI), n = 6.
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PLV089F3: Means of LAI (leaves) and light intensity in relation to cumulative LAI (leaves) in the experimental treatments in July 2009 grouped by management regime (A = 1x, B = 1NPK, C = 3x, D = 3NPK). The sloping curves show the light intensity from above the canopy (0 % LAI) in 10 cm steps down to the ground (100 % LAI), n = 6.

Mentions: A combination of values of light extinction and LA showed more pronounced differences between the three sward types (Fig. 3). The extinction curves all followed a distinct shape depending on cutting frequency. In the mature vegetation cut once, it took much less LA to intercept a certain amount of light compared with the vegetation of the plots in the three-cut regime. The –Mon-swards showed the strongest structural changes under management variation. In the plots cut three times without fertilization (Fig. 3C), the vegetation of the –Mon-swards tended to intercept the least light with 50 % of its LAI compared with the vegetation of the other sward types. In contrast, in the fertilized plots cut once (Fig. 3B), the vegetation of the –Mon-swards intercepted the most light (significantly more than the other two sward types, P ≤ 0.03, linear contrasts in LM).Figure 3.


Nitrogen addition and harvest frequency rather than initial plant species composition determine vertical structure and light interception in grasslands.

Petersen U, Isselstein J - AoB Plants (2015)

Means of LAI (leaves) and light intensity in relation to cumulative LAI (leaves) in the experimental treatments in July 2009 grouped by management regime (A = 1x, B = 1NPK, C = 3x, D = 3NPK). The sloping curves show the light intensity from above the canopy (0 % LAI) in 10 cm steps down to the ground (100 % LAI), n = 6.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4584960&req=5

PLV089F3: Means of LAI (leaves) and light intensity in relation to cumulative LAI (leaves) in the experimental treatments in July 2009 grouped by management regime (A = 1x, B = 1NPK, C = 3x, D = 3NPK). The sloping curves show the light intensity from above the canopy (0 % LAI) in 10 cm steps down to the ground (100 % LAI), n = 6.
Mentions: A combination of values of light extinction and LA showed more pronounced differences between the three sward types (Fig. 3). The extinction curves all followed a distinct shape depending on cutting frequency. In the mature vegetation cut once, it took much less LA to intercept a certain amount of light compared with the vegetation of the plots in the three-cut regime. The –Mon-swards showed the strongest structural changes under management variation. In the plots cut three times without fertilization (Fig. 3C), the vegetation of the –Mon-swards tended to intercept the least light with 50 % of its LAI compared with the vegetation of the other sward types. In contrast, in the fertilized plots cut once (Fig. 3B), the vegetation of the –Mon-swards intercepted the most light (significantly more than the other two sward types, P ≤ 0.03, linear contrasts in LM).Figure 3.

Bottom Line: In biodiversity experiments based on seeded experimental communities, species richness and species composition exert a strong influence on canopy structure and can lead to an improved use of aboveground resources.However, the allocation of biomass in response to cutting and fertilization differed among the sward types.Management had a much stronger influence on structure and light interception than plant species composition in this grassland experiment.

View Article: PubMed Central - PubMed

Affiliation: Department of Crop Sciences, University of Göttingen, Von-Siebold-Str. 8, D-37075 Göttingen, Germany Present address: Johann Heinrich von Thünen Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries, Institute of Climate-Smart Agriculture (AK), Bundesallee 50, D-38116 Braunschweig, Germany Ute_Petersen@gmx.net.

No MeSH data available.


Related in: MedlinePlus