Hand-held spectral radiometer to estimate gramineous biomass

Pearson, Robert L.; Miller, Leonard D.; Tucker, Compton J.

doi:10.1364/ao.15.000416

Cited by 71 publications

(23 citation statements)

References 2 publications

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“…Living-plant aboveground (green) biomass was measured by radiometer every 2 weeks from May to October. Radiometers measure the ratio of far-red͞infrared reflected radiation, which is used to estimate living-plant biomass (22,23) Grasshopper feeding on each of the most common grasses (P. pratensis, P. compressa, and E. smithii) was measured as the percentage of 25 blades exhibiting damage.…”

Section: Methodsmentioning

confidence: 99%

Insect herbivory accelerates nutrient cycling and increases plant production

Belovsky

Slade

2000

Proc. Natl. Acad. Sci. U.S.A.

349

315

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Ecologists hold two views about the role of herbivory in ecosystem dynamics. First, from a food web perspective in population͞community ecology, consumption by herbivores reduces plant abundance. Second, from a nutrient cycling perspective in ecosystem ecology, herbivory sometimes slows down cycling, which decreases plant abundance, but at other times speeds up cycling, which possibly increases plant abundance. The nutrient cycling perspective on herbivory has been experimentally addressed more thoroughly in aquatic systems than in terrestrial systems. We experimentally examined how grasshoppers influence nutrient cycling and, thereby, plant abundance and plant species composition over a period of 5 years. We examined how grasshoppers influence nutrient (nitrogen) cycling (i) by their excrement, (ii) by changing the abundance of and the decomposition rate of plant litter, and (iii) by both. Grasshoppers may speed up nitrogen cycling by changing the abundance and decomposition rate of plant litter, which increases total plant abundance (up to 32.9 g͞m 2 or 18%), especially, the abundance of plants that are better competitors when nitrogen is more available. However, whether grasshoppers enhance plant abundance depends on how much they consume. Consequently, ecosystems and food web perspectives are not mutually exclusive. Finally, under some conditions, grasshoppers may decrease nutrient cycling and plant abundance.

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Section: Methodsmentioning

confidence: 99%

Insect herbivory accelerates nutrient cycling and increases plant production

Belovsky

Slade

2000

Proc. Natl. Acad. Sci. U.S.A.

349

315

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“…Plant biomass (g/m2) was measured as described previously (Tucker et al 1973;Pearson et al 1976;McNaughton 1976McNaughton , 1979. Above-ground net productivity (g/m2 .…”

Section: Study Area and Methodsmentioning

confidence: 99%

Grazing as an Optimization Process: Grass-Ungulate Relationships in the Serengeti

McNaughton¹

1979

The American Naturalist

1,066

765

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ecologists have tended to view plants as relatively passive participants in short-term interactions at the plant-herbivore interface, suffering tissue reduction from herbivory, and responding in evolutionary time through the evolution of novel antiherbivore chemicals and structures (Fraenkel 1959;Ehrlich and Raven 1964;Levin 1971Levin , 1973Caswell et al. 1973;Freeland and Janzen 1974). Agronomists, botanists, foresters, and range managers, however, have frequently emphasized the direct plant responses to herbivory of compensatory growth and assimilate reallocation (

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“…Immediately prior to the weekly harvest, four pairs of in situ spectral measurements were collected from each plot to be harvested, using a hand-held radiometer (Pearson et al 1976) which measured red (0·65-0·70 lim) and photographic infrared (0·775-0·825 lim) (IR) radiances. The red and infrared measurements were used to generate the l Rjred radiance ratio and the normalized difference vegetation index (VI) or (lR-red)/(IR + red) as described by Rouse et al (1973).…”

Section: Methods and Locationmentioning

confidence: 99%

Relationship of crop radiance to alfalfa agronomic values

Tucker

Elgin²,

McMurtrey³

1980

International Journal of Remote Sensing

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Red and photographic infrared spectral data of alfalfa were collected at the time of the third and fourth cuttings using a hand-held radiometer for the earlier alfalfa cutting. Significant linear and non-linear correlation coefficients were found between the spectral variables and plant height, biomass, forage water content, and estimated canopy cover. For the alfalfa of the later cutting. which had experienced a period of severe drought stress which limited growth, the spectral variableswere found to be highly correlated with the estimated drought scores.

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Hand-held spectral radiometer to estimate gramineous biomass

Cited by 71 publications

References 2 publications

Insect herbivory accelerates nutrient cycling and increases plant production

Insect herbivory accelerates nutrient cycling and increases plant production

Grazing as an Optimization Process: Grass-Ungulate Relationships in the Serengeti

Relationship of crop radiance to alfalfa agronomic values

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