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- W2073669822 abstract "This study examines the effects of various kinds and levels of herbivory on plant processes and productivity. A model was developed to simulate growth of blue grama under field conditions. Two submodels represent uptake of carbon (C) and nitrogen (N) and their allocation within the plant. Shoots and roots were divided into structural material, characterized by high C : N ratio, and metabolic or storage material characterized by lower C : N ratio. We assumed that root and shoot growth rates were governed by C : N ratio of metabolic components of plant tissue. The model was run for three consecutive years using climatic data as driving variables. We calibrated the model with field data for 1971 and validated it against field data for 1972 and 1973. Model validation exhibits a relatively good correlation with Clark's (1977) data. Simulation of belowground grazing show that nematodes could have the biggest effect on net primary production among all grazers, but do not affect shoot production to root production ratio. Nitrogen cycling in the plant-soil system is affected much more by belowground grazing than by aboveground grazing. Sensitivity analysis was performed to determine the effects of above- and belowground grazing on net primary production and nitrogen allocation. Grasshopper grazing increases net primary production by stimulating aboveground production and increases N availability in the soil through the recycling process." @default.
- W2073669822 created "2016-06-24" @default.
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- W2073669822 date "1989-01-01" @default.
- W2073669822 modified "2023-09-26" @default.
- W2073669822 title "A simulation model of intraseasonal carbon and nitrogen dynamics of blue grama swards as influenced by above- and belowground grazing" @default.
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- W2073669822 doi "https://doi.org/10.1016/0304-3800(89)90032-x" @default.
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