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首页> 外文期刊>Irish Forestry >Modelling and mapping the potential productivity of Sitka spruce from site factors in Ireland.
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Modelling and mapping the potential productivity of Sitka spruce from site factors in Ireland.

机译：根据爱尔兰的现场因素对锡特卡云杉的潜在生产力进行建模和绘图。

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The main objective of this study was to quantify the potential productivity of Sitka spruce (Picea sitchensis (Bong.) Carr.) in Ireland. Productivity data from 201 Sitka spruce stands were used to relate general yield class (GYC) to low resolution digitised data (climate maps, soil and subsoil maps), and easily assessable site quality variables (site and vegetation classifications). Three models were derived that explained 45-52% of the variation in GYC. A spatial model was used to derive spatial predictions of productivity and map the potential productivity of Sitka spruce throughout Ireland in a Geographical Information System (GIS). This model predicted that 73% or 5.103 million ha of the total land area in Ireland was capable of producing Sitkaspruce growth of yield class 14 or greater. Furthermore, 62% of the total land area could potentially result in GYC 20 or higher yields. The results of the analysis indicated that significant potential exists for forestry development on marginal agricultural land where forestry expansion may not necessarily be in conflict with the achievement of growth targets from other agricultural subsectors (e.g. dairy and beef). A practical model was also developed, which may serve as a guide to evaluating the potential productivity of suitable sites for afforestation. Typically the confidence limits for fields with wet or dry grassland were ± 2.0 to 2.8 rtfha~(-1)yr~(-1) and blanket bog was ± 2.4 to 2.9 m~3ha~(-1)yr~(-1). A forecasting model, developed to derive predictions of productivity on forested land, might also be used to forecast timber yields.
机译：这项研究的主要目的是量化爱尔兰Sitka云杉（Picea sitchensis（Bong。）Carr。）的潜在生产力。来自201个Sitka云杉林的生产力数据用于将一般产量类别（GYC）与低分辨率数字化数据（气候图，土壤和地下土壤图）以及易于评估的场地质量变量（场地和植被分类）相关联。推导了三个模型，它们解释了GYC变化的45-52％。在地理信息系统（GIS）中，使用空间模型得出生产力的空间预测并绘制整个爱尔兰Sitka云杉的潜在生产力。该模型预测，爱尔兰总土地面积的73％（即510.3万公顷）能够使Sitkaspruce的产量达到14级或更高。此外，总土地面积的62％可能会导致GYC 20或更高的单产。分析结果表明，边际农业用地的林业发展潜力巨大，因为林业的扩张不一定与实现其他农业部门（例如乳制品和牛肉）的增长目标相抵触。还开发了实用模型，可以作为评估合适的造林地点的潜在生产力的指南。通常情况下，湿润或干燥草地的置信度范围为±2.0至2.8 rtfha〜（-1）yr〜（-1），覆盖沼泽为±2.4至2.9 m〜3ha〜（-1）yr〜（-1） 。为推导出林地生产力的预测而建立的预测模型也可用于预测木材产量。

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