Site Index for Loblolly Plantations on Cutover Sites in the West Gulf Coastal Plain
Site Index for Loblolly Plantations on Cutover Sites in the West Gulf Coastal Plain
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西湾沿岸平原割地火炬手种植园地点索引
DOI：
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发表时间：
1979
期刊：
影响因子：
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通讯作者：
T. Campbell
中科院分区：
文献类型：
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作者：
T. Popham;D. P. Feduccia;T. Deli;W. F. Mann;T. Campbell
地位指数允许廷伯兰所有者或管理者根据林地的生产能力对其进行分类。初始种植密度、间伐制度、采伐周期和轮作长度可以根据立地指数进行调整。现有地位指数曲线不适用于火炬松（Pinus taeda L.）种植在西海湾的割接点上自然再生的火炬树的曲线（美国林务局1929年，Zahner 1962年，Trousdell等人1974年）显示，当重复测量时，估计的立地指数稳定增加。Coile和Schumacher（1964）在排水等级d、-d、上种植的火炬树的曲线也是如此。Lenhart（1971）和Smalley和Bower（1971）的立地曲线是在老田地上种植的火炬树。Lenhart（1971）曲线的高度在早期较大，在较老的年龄较低，而Smalley和Bower（1971）曲线的高度在较老的年龄低于采伐迹地人工林的观测平均值。Myers（1977）的人工火炬树收获程序通过结合Lenhart（1971）的3 - 25年龄的老地曲线和Farrar（1973）的25年及以后的天然林分曲线来计算高度。对于地位指数30 - 100（指数年龄25）和年龄达70的树，Myers程序预测的树高比我们研究的任何一种变异的多型曲线都高，对于地位指数60 - 100（指数年龄25）的树高比Trousdell和其他人（1974）的多型曲线都高。本文提出了新的曲线估计火炬松人工林的地位指数和高度生长的采伐迹地在较低的西海湾沿海平原。Feduccia等人（1979）曾将这里提出的树高-年龄关系用于一个系统中，以生成产量表。
Site index permits the timberland owner or manager to classify forest land by its productive capacity. Initial planting density, thinning regimes, cutting cycles, and rotation lengths can be adjusted according to the site index. Existing site index curves are not suitable for loblolly pine (Pinus taeda L.) planted on cutover sites in the West Gulf. Curves for naturally regenerated loblolly (U.S. Forest Service 1929, Zahner 1962, Trousdell and others 1974) show a steady increase in estimated site index when measurement is repeated. The same is true of the Coile and Schumacher (1964) curves for planted loblolly on drainage classes d, -d,. Site curves from Lenhart (1971) and Smalley and Bower (1971) are for loblolly planted on old fields. The Lenhart (1971) curve has heights greater at early ages and lower at older ages while the Smalley and Bower (1971) curve has heights lower at older ages than observed averages for plantations on cutover sites. Myers’ (1977) yield program for planted loblolly computes heights by combining Lenhart’s (1971) old-field curve for ages 3 to 25 and Farrar’s (1973) curve for natural stands for ages 25 and beyond. For site indices 30 to 100 (index age 25) and ages up to 70, Myers’ program predicts taller trees than any of the anamorphic loblol ly curves we investigated and for site indices 60 to 100 (index age 25) of the Trousdell and others (1974) polymorphic curves. Our paper presents new curves for estimating site index and height growth of loblolly pine plantations on cutover sites in the lower West Gulf Coastal Plain. The height-age relationship presented here was used in a system to generate yield tables in Feduccia and others (1979).