Selective Postplanting Forb Control Increased Growth of Douglas-Fir but Not Western Larch Seedlings in Idaho

IF 1.5 4区 农林科学 Q2 FORESTRY
Andrew S Nelson, Joshua A Mullane
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Abstract

Weeding (commonly referred to as release) is a common practice in major timber-producing regions of the United States, yet the effects have not been well examined in recently established plantations in northern Idaho. This study tested the effects of selective postplanting forb control with clopyralid herbicide applied 1 year after planting on the growth and survival of Douglas-fir (Pseudotsuga menziesii var. glauca) and western larch (Larix occidentalis) for 5 years across a site productivity gradient in northern Idaho. Forb cover was reduced in Douglas-fir plots but not western larch plots. The result was an increase in diameter, height, and stem volume of Douglas-fir seedlings 5 years after treatment at low and high productivity sites, but no effect on western larch. Survival of both species was unaffected by the treatment and remained high, likely because of the generally high productivity of all sites. Results suggest that postplanting forb control with clopyralid may be best suited to Douglas-fir plantations in the region. The early gains in size are likely to persist into the future given the divergent growth trajectories observed, potentially shortening rotations and increasing final stand volume production. Study Implications: Clopyralid is an effective tool for selectively controlling forbs after planting in recently established plantations in northern Idaho. The response was species-specific. Results showed Douglas-fir had positive gains in size 5 years after treatment, whereas western larch growth was unaffected. Results can help guide operational decisions regarding whether and in which situations clopyralid may be applied to accelerate stand growth by reducing postplanting competition.
在爱达荷州,播种后有选择性地控制杂草能促进花旗松幼苗的生长,但不能促进西部落叶松幼苗的生长
除草(通常称为释放)是美国主要木材产区的常见做法,但在爱达荷州北部新近建立的人工林中,除草的效果还没有得到很好的研究。本研究测试了在爱达荷州北部一个生产力梯度上使用氯吡咯烷除草剂对花旗松(Pseudotsuga menziesii var. glauca)和西部落叶松(Larix occidentalis)进行为期 5 年的种植后选择性除草的效果。花旗松地块的草本植物覆盖率降低了,但西部落叶松地块的草本植物覆盖率没有降低。结果是在低生产力和高生产力地点,花旗松幼苗在处理 5 年后的直径、高度和茎干体积都有所增加,但对西部落叶松没有影响。两种树种的存活率都不受处理的影响,仍然很高,这可能是因为所有地点的生产力普遍较高。结果表明,使用氯吡菌酰胺控制种植后的禁止植物可能最适合该地区的花旗松种植园。鉴于观察到的不同生长轨迹,早期的面积增长可能会持续到未来,从而有可能缩短轮伐期并提高最终的林木产量。研究意义:Clopyralid 是在爱达荷州北部新近建立的人工林种植后选择性控制草本植物的有效工具。反应具有物种特异性。结果表明,花旗松在处理后 5 年的面积有了正增长,而西部落叶松的生长则未受影响。这些结果有助于指导操作决策,决定是否以及在何种情况下使用氯吡菌胺,通过减少种植后的竞争来加速林分生长。
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来源期刊
Forest Science
Forest Science 农林科学-林学
CiteScore
2.80
自引率
7.10%
发文量
45
审稿时长
3 months
期刊介绍: Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management. Forest Science is published bimonthly in February, April, June, August, October, and December.
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