Long-term response of spruce–fir stands to herbicide and precommercial thinning: observed and projected growth, yield, and financial returns in central Maine, USA
Long-term response of spruce–fir stands to herbicide and precommercial thinning: observed and projected growth, yield, and financial returns in central Maine, USA
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云杉-冷杉对除草剂和商业化前间伐的长期反应：美国缅因州中部观察到的和预计的生长、产量和财务回报
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
A. Weiskittel
中科院分区：
文献类型：
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作者：
M. Bataineh;R. Wagner;A. Weiskittel
除草剂应用和商业前间伐（PCT）是北美和欧洲常用的造林处理方法。尽管这种广泛的使用，长期的增长和产量的反应，包括这两种处理的对照实验是相对罕见的。我们使用40年的生长和产量的云冷杉林的早期除草剂和PCT的各种组合在美国中部缅因州，在一个长期的造林实验，校准森林植被模拟器（东北变种）。使用校准的模型，我们预计轮伐期长度的结果，林分的发展，可销售的木材量，和立木为基础的财务回报。预测表明，相对于未处理的林分，在轮作结束时（收获后60年），除草剂处理的总产量增加（17%-31%）。PCT也实现了可销售木材量的大幅度增加。PCT后24年，林分立木价值平均为907美元·公顷-1，高于未减薄林。
Herbicide application and precommercial thinning (PCT) are common silvicultural treatments used across North America and Europe. Despite this widespread use, long-term growth and yield responses from controlled experiments that include both of these treatments are relatively rare. We used 40-year growth and yield responses of spruce–fir stands to various combinations of early herbicide and PCT in a long-term silvicultural experiment in central Maine, USA, to calibrate the Forest Vegetation Simulator (Northeast Variant). Using the calibrated model, we projected rotation-length outcomes for stand development, merchantable wood volumes, and stumpage-based financial returns. Projections indicated gains in total yield (17%–31%) from herbicide treatments at the end of the rotation (∼60 years postharvest) relative to untreated stands. Substantial increases in merchantable wood volume also were achieved with PCT. Twenty-four years after PCT, stand stumpage value averaged $907 USD·ha−1 higher than that for unthinn...