Use of Site Index as a Forestry Management Tool
Use of Site Index as a Forestry Management Tool
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使用站点索引作为林业管理工具
DOI：
10.2307/3628111
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发表时间：
1987
期刊：
影响因子：
--
通讯作者：
And Keith D. Lynch
中科院分区：
文献类型：
--
作者：
W. Geyer;And Keith D. Lynch
讨论了评价乡土用材林生长潜力的方法。给出了新的黑核桃立地指数曲线和堪萨斯州东部主要木材树种的一般立地关系。林木的生长取决于环境因素的复杂相互作用--气候、生物、地形和土壤(土壤)。“场地”一词用来表示这些因素的总和。地形和土壤对树木的影响不是很明显。地形包括地形、坡向和坡度，而土壤特性包括质地、结构、土壤水分和肥力。图1说明了地形和土壤因素与南方松树生长的假设关系(Zahner，1957)。树高的生长是林分产材量的良好指标。因为树高是树龄和生长环境的函数，所以环境因素可以被测量并与生产力相关。立地指数法是评估森林或林地立地生产力的最广泛接受的方法。这种方法简单易用，与木材产量有很好的相关性。虽然立地指数主要用于评估为木材产品管理的本地木材林分，但它也可用于评估一个地区用于多种不同用途的植树潜力。根据定义，立地指数是指蓄积量充足、年龄均匀的林分中优势树的平均高度(50年树龄)。最常用的估计立地指数的技术是立地指数曲线法和土壤-立地间接评价法。
Methods for evaluating the growth potential of native timber stands are discussed. A new site index curve for black walnut and general site relationships of preferred timber species for eastern Kansas are presented. Forest tree growth is dependent upon a complex interaction of environmental factors--climatic, biotic, topographic, and edaphic (soils). The term "site" is used to express the sum total of these factors. Topography and soils affect trees in ways not readily apparent. Topography includes landform, aspect, and slope, whereas soil characteristics include texture, structure, soil moisture, and fertility. Figure 1 illustrates topographic and soil factors as they hypothetically relate to pine tree growth in the South (Zahner, 1957). Growth in height is a good indicator of the volume of timber produced in a stand. Because tree height is a function of the age of a tree and the environment in which it grows, environmental factors can be measured and related to productivity. The site-index method is the most widely accepted means of evaluating site productivity in forests or woodlands. This method is easy to use and correlates well with timber yields. While site index is used primarily in evaluation of native timber stands being managed for timber products, it is also valuable in estimating the potential of an area for tree planting for a number of different purposes. By definition, site index is the average height (at age 50 years) of dominating trees in a fully-stocked, even-aged stand. The most commonly used techniques for estimating site index are site-index curves and indirect soil-site evaluation.