共查询到18条相似文献，搜索用时 171 毫秒
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进行马尾松截根苗不同处理和常规造林对比试验，结果表明：用复合微生物茵肥与红泥浆混合液处理马尾松截根苗造林，对于提高马尾松的造林成活率和当年抽梢均有显著的效果。 相似文献
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<正> 前言造林成活率是衡量造林成效的主要标志之一,当年抽梢长度,反映着造林质量。为进一步提高造林效果,探讨造林成活率和促进当年抽梢生长情况,在造林时,我们对马尾松苗木用红泥浆磷肥混合液沾根处理,进行造林试验,取得了一定效果。现将我们的试验介绍如下: 相似文献
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通过对火炬松、广西岑溪马尾松和上杭马尾松３个种源进行生长状况和不同整地模式的试验研究结果表明：火炬松和岑溪马尾松的生长量明显高于上杭马尾松，而且造林费用低。通过全面整地、带状整地和块状整地３种模式造林林分生长比较试验，看出了３种整地模式对幼林林分生长量不存在显著性差异，因而推行块状整地挖穴造林模式可以明显降低造林成本，提高林分经济效益。 相似文献
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不同造林技术措施对马尾松幼林生长影响的研究 总被引：7，自引：1，他引：6
在贵州省台江县革东镇设置了反映马尾松人工造林各主要技术环节的试验林体系,以研究不同造林技术措施对马尾松幼林生长的影响。经对试验林固定样地进行连续８年的定期、定位测定,以及对测定结果进行统计分析,结果表明,在马尾松人工造林的各主要技术措施中,立地选择、种源选择和造林密度是影响幼林生长的最重要因素,整地规格对马尾松幼林生长有较明显影响,幼林施肥有一定影响,而整地方式和幼林抚育则无明显影响。在研究基础上初步提出了可供试验地区应用的马尾松工业用材林定向培育的造林技术措施。 相似文献
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火炬松,马尾松种源及不同整地模式的研究 总被引：2，自引：0，他引：2
通过对火炬松、广西岑溪马尾松和上杭马尾松３个种种进行生长状况和不同整地模式的试验研究结果表明：火炬松与岑溪马尾松的１生长量明显高于上杭马尾松，而且要费用低。通过全面整地、带状 和块状整地３种模式造林林分生长比较试验，看出了３种整地模式对幼林林分生长量不存在显著性差异，因而推行块状整地挖穴要模式可以明显降低造林成本，提高林分经济效益。 相似文献
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马尾松不同种源、不同密度、不同整地规格造林试验表明,马尾松不同种源生长差异显著,容县松、上思松、尤溪松三者之间幼林生长表现最好的是容县松,其次是上思松,造林3年后容县松树高、胸径分别达到3．07m、3．51cm,比尤溪松树高、胸径生长分别增加了15．0％、25．8％,单株总生物量、地上部生物量、地下部生物量分别增加了32．5％、31．1％、40．4％;造林2年的宁明松和尤溪松相比,宁明松生长明显优于尤溪松,树高生长增加了16．4％,胸径生长增加了10．1％,单株总生物量、地上部生物量、地下部生物量分别增加了43．4％、40．2％、60．7％;马尾松虽然耐瘠薄,但立地条件的好坏对林分生长影响比较明显,高标准、高质量的马尾松林分需要立地条件的保证;造林密度和整地规格对马尾松幼林生长无显著影响,考虑到生产实际,马尾松造林株行距可采用2．0m×2．0m,马尾松容器苗造林整地规格可以适当降低,穴的规格可以采用25cn×20cn×20cn中穴造林或15cn×15cn×10cm的小穴造林。 相似文献
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马尾松苗木切根造林，其一苗木采用切根蘸红泥浆溶液后上山造林，其二苗木采用切根蘸2％的复合微生物菌肥溶液后上山造林，应用2种不同方法对苗木进行处理，对造林后的苗木成活率，林木生长量进行比较。其结果表明：应用复合微生物菌肥溶液处理造林的苗木成活率，林木生长量比用红泥浆溶液处理的苗木造林成活率能提高12％，当年林木平均抽梢提高44．1％。 相似文献
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马尾松林分个体干形变化与修枝抚育技术初步研究 总被引：3，自引：0，他引：3
根据马尾松幼林生长的实际状况，设计４个大样地并随机抽取４组超大样本。经统计分析，马尾松二次抽梢现象十分明显，达４５％；分叉现象，侧枝代替主枝现象，藤蔓植物缠绕现象均较普遍。提出以个体为中心，以修枝为主要手段的幼林抚育管理技术，代替传统的以锄抚和去除非目的植物为主的抚育习惯。认为应改善马尾松造林工程的投资结构，以利该项事半功倍的技术措施得到了有效推广。 相似文献
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Although intensively managed pine forests are common in the southeastern US, few studies describe how combinations of mechanical (MSP) and chemical site preparation (CSP) and herbaceous weed control (HWC) techniques affect bird communities that use early successional habitats within young pine forests. Therefore, we examined effects of six treatments of increasing management intensity via combinations of MSP (strip-shear and wide spacing or roller chop and narrow spacing) and CSP (application or no application) treatments with banded or broadcast HWC on bird communities in six loblolly pine (Pinus taeda) plantations in the Coastal Plain of North Carolina, USA, for 8 years following site preparation. Wide pine spacing and strip-shear MSP increased bird abundance and species richness over narrow spacing and chopped MSP for 6 years after planting. Chemical SP reduced bird abundance in year 2, increased bird abundance in year 6, had no effect on abundance after year 7, and did not affect species richness in any year. Total bird abundance and species richness were similar between banded and broadcast HWC. Site preparation and HWC had no effect on bird diversity and bird communities were most similar in treatments of similar intensity. Site preparation and HWC had few or no effects on birds based upon migratory status, habitat association, or conservation value. The addition of chemical site preparation or HWC had little effect on birds beyond pine spacing, and bird abundance was not proportional to management intensity. Although we observed treatment effects, all treatments provided habitat used by a variety of bird species, and pine plantations may play an increasingly important role in bird conservation as forests become fragmented and converted to other land uses and as natural processes that create early successional habitat, such as fire, are suppressed. 相似文献
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Raquel Alfaro-Sánchez Francisco R. López-Serrano Eva Rubio Daniel Moya Raúl Sánchez-Salguero Jorge De Las Heras 《European Journal of Forest Research》2014,133(5):793-807
Despite the low timber productivity of Mediterranean Pinus halepensis Mill. forests in south-eastern Spain, they are a valuable carbon sequestration source which could be extended if young stands and understories were considered. We monitored changes in biomass storage of young Aleppo pine stands naturally regenerated after wildfires, with a diachronic approach from 5 to 16 years old, including pine and understory strata, at two different quality sites (dry and semiarid climates). At each site, we set 21 permanent plots and carried out different thinning intensities at two ages, 5 and 10 years after fires. We found similar post-fire regeneration capacity at both sites in terms of total above-ground biomass storage ~6 Mg ha?1 (3 Mg ha?1 of the above-ground pine biomass plus 3 Mg ha?1 of the above-ground understory biomass), but with a contrasting pine layer structure. Generally, across the diachronic study, the earlier thinning reduced biomass stocks at both sites, except for the best quality site (the dry site), where the earliest thinning (applied at post-fire year 5) enlarged carbon storage by 11 % as compared to non-thinned plots. We found root:shoot ratios of an average 0.37 for the pine layer and 0.45 for the understory layer. These results provided new information which not only furthers our understanding of carbon sequestration in low timber productivity Mediterranean forests, but will also help to develop new guidelines for sustainable management adapted to the high-risk terrestrial carbon losses of fire-prone areas. 相似文献
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整地施肥对尾叶桉萌芽林生长影响的研究 总被引：1，自引：1，他引：1
通过开展整地施肥对尾叶桉萌芽林生长影响的研究，结果表明，全垦、带垦和穴垦3种整地方式对尾叶桉伐桩萌芽率、直立/优势萌芽余数及萌芽林树高和胸径生长有一定影响，但不明显；整地加施肥(全垦 施肥、带垦 施肥和穴垦 施肥)比单整地不施肥处理(全垦、带垦和穴垦)萌芽率提高5％左右；直立／优势萌芽余数整地加施肥处理在4．6—5．2条/桩之间，比单整地不施肥处理的平均多2条/桩左右；27个月生时，整地加施肥比单整地不施肥处理萌芽林的树高分别提高67．2％，60．7％和85．3％，胸径提高28．3％，25．7％和10．7％。 相似文献
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Kristina Wallertz Kjersti Holt Hanssen Karin Hjelm Inger Sundheim Fløistad 《Scandinavian Journal of Forest Research》2016,31(3):262-270
Feeding by pine weevil (Hylobius abietis L.) causes severe damage to newly planted conifer seedlings in most parts of Scandinavia. We investigated the effect of planting time and insecticide treatment on pine weevil damage and seedling growth. The main objective was to study if planting in early autumn on fresh clear-cuts would promote seedling establishment and reduce the amount of damage caused by pine weevil the following season. The experiment was conducted in southern Sweden and in south-eastern Norway with an identical experimental design at three sites in each country. On each site, Norway spruce seedlings with or without insecticide treatment were planted at four different planting times: August, September, November and May the following year. In Sweden, the proportion of untreated seedlings that were killed by pine weevils was reduced when seedlings were planted at the earliest time (August/September) compared to late planting in November, or May the following year. This pattern was not found in Norway. The average length of leading shoot, diameter growth and biomass were clearly benefited by planting in August in both countries. Insecticide treatment decreased the number of seedlings killed or severely damaged in both Norway and Sweden. 相似文献
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《Scandinavian Journal of Forest Research》2012,27(1-4):237-247
Leader shoot damage was imposed on young Scots pines (3 m high) in four ways: by caging the uppermost whorl including the leader shoot with 10 pine shoot beetles; by caging the two uppermost whorls with 20 beetles; by topping the tree below the 1984 whorl; by topping the trees as above and removing all current shoots in whorl 1983. Six years later, top‐damaged trees were still significantly shorter than undamaged controls, although the annual height growth rate had recovered to the pre‐damage level within 3 years. Recovery occurred in two ways: lateral branches from the nearest intact whorl took dominance over the damaged leader or secondary branches developed from interfascicular buds on the damaged leader shoot. Approximately one and two years of height growth were lost in the former and latter case, respectively. Only 5 of the 34 top‐damaged trees escaped technical defects (crooks and/or vertical branches). Stem diameter and crown development were slightly affected. 相似文献
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短叶省藤和黄藤组培苗造林研究 总被引：1，自引：0，他引：1
造林试验结果表明，黄藤组培苗的适应性与保存率不低于实生苗，其造林的立地、整地、上层林木和种植措施等可与实生苗相同。黄藤组培苗能保持母株优良的生长特性，生长显著快于未经选择的实生苗。同时，组培丛芽苗的第1单芽的茎长生长快于第2单芽的茎长生长。短叶省藤的单芽高度与造林保存率有显著的相关性．高度大的单芽保存率高，反之则小。造林前的苗高分析表明，单芽苗和丛芽苗第1单芽的保存率与其造林前苗高大于15cm的比率接近，丛芽苗第2单芽的保存率与其造林前苗高大于10cm的比例接近，第3单芽的保存率与其造林前苗高大于5cm的比例接近。与黄藤相同，短叶省藤丛芽苗各单芽的生长速度也与造林前单芽的高度相关，苗高大的单芽生长快，苗高小的单芽生长慢。 相似文献
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Plantation data from northern Ontario were subjected to stepwise regression analysis to express survival and total height as functions of site factors, planting stock characteristics and age for each of black spruce (Picea mariana [Mill.] B.S.P.), white spruce (P. glauca [Moench] Voss) and jack pine (Pinus banksiana Lamb.).Total height and height increment were affected more significantly, but by fewer factors, than survival. Black spruce survival was the most heterogeneous variable, as six factors accounted for 55.6% of its variability. Between one and five qualitative site factors (represented by dummy variables) accounted for less than 23% and 30%, respectively, of the variability in survival rate and total height. Stock type, planting season, weed control and chemical site preparation showed low but significant correlations with the response variables. Quality index was significant in every case, while shoot:root ratio, root collar diameter and dry weight were significant in some cases. The single most significant variable was plantation age, accounting for up to 30% and 63%, respectively, of the variability in survival rate and total height. 相似文献