栽植密度对小黑杨边材、湿心材生长量的影响
Effects of P lanting Density on Increment of SapwoodandWetwood in Populus × xiaohei
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摘要: 以山西朔州地区的人工林小黑杨为研究材料, 研究不同栽植密度( 2 m ×5 m、4 m ×5 m、4 m×10 m )对小黑杨边材、湿心材生长量的影响。结果表明: 不同栽植密度间边材年轮数差异不显著, 而湿心材年轮数差异显著; 栽植密度对边材宽度影响不大, 而对湿心材宽度影响达极显著水平; 对边材面积和湿心材面积影响均达极显著水平。随着栽植密度的减小, 小黑杨边材、湿心材宽度及面积均呈增加趋势, 但湿心材增加得更快。湿心材比例为60% ~68%, 且随着栽植密度的减小而增大。总体而言, 栽植密度对小黑杨边材、湿心材生长量有不同程度的影响, 且对湿心材生长量影响较大。Abstract: The effects o f d ifferent plan ting densit ies ( 2 m×5m、4 m×5m、4m×10 m) on increment of sapw oodand w etwood o fPopulus× xiaohei w ere stud ied from Shuozhou Country, Shanx i Prov ince. The resu lts indicated thattherew ere insignificant differences in the number of sapwood grow th rings at various p lanting densities, w hile significant d ifferences ex isted in the number of w etw ood grow th ring s. The plan ting density show ed little impact on sap wood width, wh ile it had high ly sign if icant effects on w etw ood w idth. For bo th sapwood and w etwood basa l area,therew ere high ly sign ificant d ifferences at various p lanting densities. A tendency o f increasing sapwood and we tw oodw idth as w ell as basa l area w ith decreasing plant ing densities was found, and itw as a lso no ticed that thew id th andbasal area o fw etw ood increasedmore in tensively than that of sapwood. The w etw ood proportion ranged from 60% to68%, show ing a negative re lationship w ith the p lanting density. In genera,l the plan ting density show ed various degrees o f impact on g row th of both sapw ood and we tw ood ofP opulus×x iaohei, and it showedmore obv ious effects onw etw ood grow th, compara tively.
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Key words:
- Populus× x iaohei
- / plant ing density
- / sapw ood
- / w etw ood
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