Publications by DAM
Veg changes in Great Plains US NPS units
Unit-level changes over time Change in the proportion of sample points with < 5% tree cover over the study period (1985-2020). However, these declines in tree-less area do not appear to come at the cost of other land cover types: In fact, over all 27 units from 1985-2020, there are only 18 instances of changes greater than 10% in mean cover (i...
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Rothermel::ros() test
library(Rothermel) # v. 1.2 data("SFM_metric") Low fuel load Total load = 0.24 tonnes/ha. ros ( modeltype = 'D', w = c( 0.024, # 1 hr 0, # 10 hr 0, # 100 hr 0.216, # Live fine 0 ), # Live coarse, s = SFM_metric ['GR2', 7:11], delta = 10, mx.dead = 15, h = SFM_metr...
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FireAndVegNationalGrasslands
Overview Objectives Describe spatial and temporal trends of fire across US National Grasslands in the Great Plains Describe vegetation patterns in response to fire Vegetation structure (bare ground, litter, woody vegetation) Annual forb & grass responses Perennial forb and grass cover and productivity (forage resource responses) Responses of w...
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Comparing Coefficient of Variation across means
Introduction Variability–statistically, variance, the second data moment–is an important ecological property, often more consequential for understanding ecosystem processes than the first statistical moment, the mean. Since variability can be an abstract concept, there is understandable incentive to apply simple measures when describing it. ...
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Dayton Soil Analysis
Background Sampling to investigate rangeland soil responses to management at NDSU’s Hettinger Research Extension Center (HREC) has, to date, only been initiated once the grazing season has begun, which is often weeks if not months after prescribed fire. But it has been well-documented elsewhere that important plant-available species of nitrogen...
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CGREC veg trends
Key take-aways Initial composition across treatment groups was not consistent. The Refuge pastures that were assigned to continuous grazing without fire had substantially more smooth brome and fewer native forbs and legumes. Few plant functional groups showed trends that can reasonably be attributed to management. These are limited to increased ...
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Fire and vegetation on the Sheep Station
Fire effects on community composition Global test of group effects via adonis2. Df SumOfSqs R2 F Pr(>F) Deferment 1 0.05 0.01 0.78 0.47 BurnSeason 2 1.64 0.22 14.04 0.01 TSF 1 1.07 0.14 18.28 0.01 Deferment:BurnSeason 2 0.25 0.03 2.17 0.04 Deferment:TSF 1 0.01 0 0.1 0.99 BurnSeason:TSF 2 0.38 0.05 3.21 0.01 Deferment:BurnSeason:TSF 2 -0....
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