240 resultados para Carex
Resumo:
在典型矮蒿草草甸上,按大小梯度设置温棚（由小到大依次为A、B、C、D、E）进行模拟增温效应对黑褐苔草（Carex alrofusca）的分蘖数、叶片数和高度影响的研究.结果表明：温度（地表温度和地温）随温室的减小而升高,其中,温室A内地表温度和地温最高,比对照分别提高了2.35℃和2.13℃.温室D的分蘖数增幅最大,温室D与温室A间分蘖数变异达到显著水平（P〈0.05）,温室A至D中黑褐苔草的分蘖数变异随温度的升高而降低,并与温度呈负相关关系（P地表〈0.05;P地温〈0.01）;叶片数的变化趋势与分蘖数基本一致;黑褐苔草平均高度随温度的增加而升高,温室A与对照间达到极显著水平（P〈0.01）,各处理黑褐苔草高度与温度呈正相关且达到极显著水平（P〈0.01）.
Resumo:
Monitoring of herbaceous plants on the Ottawa National Forest (ONF) is used to understand the impact of forest management on understory composition and site conditions. In their planning, national forests are required to take into account management impacts on diversity and ecosystem health. The effect of management on understory species is dependent on various factors, including the intensity of disturbance and the biology of the plant. In the first study in this report, a population of Carex assiniboinensis, a Michigan state threatened species, was monitored for seven seasons including before logging commenced, in order to determine the sedge’s response to a single-tree selection harvest. Analyses provided insights for management of C. assiniboinensis at the stand level over the short-term. In the second study in this report, the use of the cutleaf toothwort (Cardamine concatenata) as a Management Indicator Species on the ONF was reviewed. Data were analyzed to determine the suitability of using C. concatenata to monitor impacts of forest management on site conditions. The various factors that affect understory species population dynamics illuminated the challenges of using indicator species to monitor site conditions. Insights from the study provide a greater understanding of management impacts on understory species across the Ottawa National Forest.
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Otto Appel
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von H. F. Link
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Pfuhl
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Von A. Kneucker
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Von A. Kneucker
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AR
