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Simulation of vegetation dynamics and management strategies on south Texas, semi-arid rangeland

机译：德克萨斯州南部半干旱牧场的植被动态模拟和管理策略

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In this paper, we describe a model designed to simulate seasonal dynamics of warm and cool season grasses and forbs, as well as the dynamics of woody plant succession through five serai stages, in each of nine different plant communities on the Rob and Bessie Welder Wildlife Refuge. The Welder Wildlife Refuge (WWR) is located in the Gulf Coastal Prairies and Marshes ecoregion of Texas. The model utilizes and integrates data from a wide array of research projects that have occurred in south Texas and WWR. It is designed to investigate the effects of alternative livestock grazing programs and brush control practices, with particular emphasis on prescribed burning, the preferred treatment for brush on the WWR. We evaluated the model by simulating changes in the plant communities under historical (1974-2000) temperature, rainfall, livestock grazing rotation, and brush control regimes, and comparing simulation results to field data on herbaceous biomass and brush canopy cover collected on the WWR over the same period. We then used the model to simulate the effects of 13 alternative management schemes, under each of four weather regimes, over the next 25 years. We found that over the simulation period, years 1974-2000, the model does well in simulating the magnitude and seasonality of herbaceous biomass production and changes in percent brush canopy cover on the WWR. It also does well in simulating the effects of variations in cattle stocking rates, grazing rotation programs, and brush control regimes on plant communities, thus providing insight into the combined effects of temperature, precipitation, cattle stocking rates, grazing rotation programs, and brush control on the overall productivity and state of woody plant succession on the WWR. Simulation of alternative management schemes suggests that brush canopy removal differs little between summer and winter prescribed burn treatments when precipitation remains near the long-term average, but during periods of low precipitation canopy removal is greater under winter prescribed burning. The model provides a useful tool to assist refuge personnel with developing long-term brush management and livestock grazing strategies.
机译：在本文中，我们描述了一个模型，该模型旨在模拟Rob和Bessie Welder野生动物上九个不同植物群落中每个季节的温暖和凉爽季节的草和草的动态，以及通过五个Seri阶段的木本植物演替动态。避难所。韦尔德野生动物保护区（WWR）位于德克萨斯州墨西哥湾沿海草原和沼泽生态区。该模型利用并整合了来自德克萨斯州南部和WWR的大量研究项目的数据。它旨在调查替代性放牧计划和刷控制实践的效果，特别强调规定的燃烧，这是WWR上刷的首选处理方法。我们通过模拟历史（1974-2000）温度，降雨，牲畜放牧轮作和灌木丛控制制度下植物群落的变化，并对模拟结果与WWR上收集的草本生物量和灌木冠层覆盖的实地数据进行了比较，对模型进行了评估。同一时期。然后，我们使用该模型来模拟在接下来的25年中，在四种天气状况下，分别采用13种替代管理方案的效果。我们发现，在1974-2000年的模拟期内，该模型在模拟草本生物量生产的大小和季节性以及WWR上的冠层覆盖百分比变化方面表现出色。它在模拟牲畜饲养率，放牧轮作程序和画笔控制方式对植物群落的影响方面也表现出色，因此可以深入了解温度，降水量，牲畜饲养率，放牧轮作程序和画笔控制的综合影响WWR的整体生产力和木本植物继承状况。替代管理方案的模拟表明，当降水量保持在长期平均水平附近时，夏季和冬季规定的烧伤处理之间的灌木冠层清除量几乎没有差异，但是在低降水量期间，冬季规定的燃烧下的冠层清除量较大。该模型提供了一个有用的工具，可以帮助庇护人员制定长期的毛刷管理和牲畜放牧策略。

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