子午岭人工油松林群落更新特征及影响因子-《山地学报》

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Title:: The Regeneration Characteristics and Affecting Factors of Pinus tabulaeformis Artificial Forests of Ziwu Mountains，China

作者:: 张希彪; 上官周平; 王金成; 毛宁; 1. 甘肃省高校陇东生物资源保护与利用省级重点实验室 / 陇东学院生命科学与技术学院，甘肃庆阳 745000；
2. 黄土高原土壤侵蚀与旱地农业国家重点实验室，中国科学院水利部水土保持研究所，陕西杨凌 712100

Author(s):: ZHANG Xibiao; SHANGGUAN Zhouping; WAN Jicheng; MAO Ning; 1. University provincial key laboratory for protection and utilization of Longdong Bioresources in Gansu province, college of life science and technology, Longdong University, Qingyang 745000, Gansu,China；
2.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Water and Soil Conservation, Chinese Academy of Sciences and Ministry of Water Resoures, Yangling 712100 Shaanxi,China

关键词:: 油松; 更新; 环境因子; 黄土丘陵区; 子午岭

Keywords:: Pinus tabulaeformis artificial forests; regeneration characteristics; environmental factor; Loess hilly area; Ziwu Mountains

分类号:: S718.5.S754

文献标志码:: A

摘要:: 采用样方法，对子午岭油松人工林群落更新特性以及环境因子对群落更新的影响进行研究，结果表明：油松人工林更新层有木本植物46种，其中有乔木16种，占总种数的3333%，灌木29种，占总种数的6458%。更新层的优势种有辽东栎、沙梾和鞘柄菝葜等，油松为更新层的次优势种，油松种群具有一定的自我更新能力；油松人工林群落更新层幼苗库丰富，高度级及龄级较小；更新方式以实生更新为主。林分密度对林下乔木幼苗、幼树数量影响极显著 (P<001)，当林分密度从650株/ hm2增加到 1 550株/hm2时，林下更新的幼苗、幼树密度呈增加趋势，随着林分密度的继续增加，其密度逐渐减少；坡向对幼苗、幼树密度的影响显著(P<005)，当坡向由阳坡转向阴坡时，林下幼苗（树）密度逐渐增加；不同坡位林分更新特征各异，从坡下向上，幼苗密度逐渐减少，而幼树密度在中坡位最高，其次是下坡位，上坡位最低；随着海拔的升高，幼苗（幼树）密度逐渐减小。处于阴坡的中密度林分更新效果最佳，合理调整林分密度有利于油松人工林自然更新。

Abstract:: This study investigated the characteristics of community regeneration and the effect of environmental factors on community regeneration of Pinus tabulaeformis artificial forest in Loess hilly area of Ziwu Mountains，northwest China by using sampling plot method. The results showed that there were 46 woody plants in the regeneration layer of Pinus tabulaeformis artificial forests, among which 16 species were arbors and 29 species were shrubs, accounting for 3333% and 6458% of the total, respectively. The dominant species of regeneration layer were Quercus wutaishanica, Swida bretchneideri, Smilax stans, etc. Pinus tabulaeformis was the subdominant species, and its populations had some selfrenewal ability. Pinus tabulaeformis artificial forests possess abundant seedling bank of lower heightclass and ageclass. The main regeneration type was seedling. The stand density had a extremely significant effects on understory arbor seedling and the amount of saplings (P<001). The densities of regenerated seedlings and saplings understory increased when stand density increased from 650 trees/hm2 to 1 550 trees/hm2, but it decreased gradually with stand density continued increasing. Slope aspect also had a significant influence on seedling and sapling densities (P<005). The seedling densities increased gradually when slope aspect changed from sunny slope to shady slope. The forest regeneration characteristics differed at different slope position. The seedling densities decreased gradually from down slope to up, while the sapling densities of middle slope was the highest, followed by lower slope, and the upper slope was the lowest. The seedling (sapling) decreased gradually with the altitude increasing. It was indicated that medium stand density on shady slope had the best regeneration. Thus, to rationally regulate stand density could be conducive to natural regeneration of Pinus tabulaeformis artificial forests.

《山地学报》[ISSN:1008-2186/CN:51-1516]

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