共查询到20条相似文献,搜索用时 188 毫秒
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樟子松造林地建立临时苗圃的造林技术 总被引:1,自引:0,他引:1
榆林沙区樟子松造林。在造林地建立临时苗圃。为大面积造林提供优质苗木。随时起苗随时造林。成活率明显提高。达到98%。比运输苗造林成活率高出10%~35%。 相似文献
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榆林沙区樟子松造林季节选择 总被引:1,自引:0,他引:1
通过对榆林沙区樟子松造林季节主要气候因子的测定分析、樟子松不同造林期根系生长情况的调查分析、樟子松不同季节造林试验及其结果分析.认为在榆林沙区樟子松大面积造林的适宜季节是雨季(8月中旬至9月上旬). 相似文献
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通过对3年生樟子松容器苗与裸根苗定植后的成活率、保存率、生长量、生产管理和投资费用对比分析,提出了定植容器苗大大优于裸根苗,定植成活率和保存率分别达到96.3%和99%。与裸根苗相比,容器苗造林每667 m2可节约投资764元。特别是在风沙、干旱、瘠薄的榆林沙区,由于风沙侵蚀严重,立地条件低劣,更应提倡并推广使用容器苗... 相似文献
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沙柳成活率影响因素及其综合效益分析 总被引:2,自引:0,他引:2
沙柳是榆林沙区优良固沙树种,也是沙区重要的灌木资源。通过探讨流动沙丘沙柳造林成活率的影响因素和分析沙柳的综合效益,以促进沙柳大面积防风固沙造林、加速流沙固定,加快沙柳产业的发展以及充分发挥沙柳的综合效益。 相似文献
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干旱沙区由于立地条件和涵水能力差,导致造林成活率低,使用"清华绿宝"抗旱保水剂对同一地区不同树种进行蘸根造林,试验结果表明:显著地提高了造林成活率,尤以阔叶树种更为明显,比对照提高了13.3个百分点;促进造林苗木的生长;地径增粗明显。该项技术适宜在同类地区的林业工程造林中推广应用。 相似文献
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广西沿海砂质地风大、高温,土壤贫瘠,乡土阔叶造林树种选择困难.通过4年10个树种比较试验,结果表明:生长表现为杂交相思(Acaciamangium×A.auriculaeformis)>枫香(Liquidambar formosana)>铁刀木(Cassia siamea)>米老排(Mytilaria laosensis)>灰木莲(Mangleitia glauca)>越南青冈(Cyclobalanopsis austro-cochinchinensis)>稠木(Lithocarpus thalassica)>红锥(Castanopsis hystrix)>墨西哥洋椿>(Cedreia mexicana)>顶果木(Acrocarpus fraxinifolius).杂交相思生长量虽然大,但干形差、耐寒性差,成活率偏低.枫香生长量大,保存率高、干形好、树高及胸径变异系数小,林相整齐,可作为优良乡土阔叶树种在广西南部沿海地区推广造林.灰木莲、米老排和铁刀木树高、胸径、材积生长中等,保存率中等,干形一般,树高及胸径变异系数大,但林相整齐,可选择立地条件稍好地段造林.红锥、稠木、墨西哥洋椿、顶果木、越南青冈生长差,保存率低,树高及胸径变异系数大,林相差,不宜在广西沿海砂质地造林. 相似文献
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应用大叶相思、肯氏相思、毛娟相思、马占相思和厚荚相思等相思树种在东山县沿海沙地上营建防护林,并对其抗风、抗台风及抗连续干旱性能进行了测定。结果表明:厚荚相思抗风能力强,生长快,是较好的可在沿海沙地上适生的树种;相思树种抗台风能力较木麻黄弱,台风对相思树种的主要危害是断梢,但在以后的生长中能较快地得到恢复,对相思林分生长并不会产生大的影响;厚荚相思在沿海沙地上造林,不仅成活率高(95%以上),而且在遭受连续8个月的干旱后,旱死率为0,表现出很强的抗旱能力,而且在贫瘠的沙地土壤上生长表现良好,其生长量超过了木麻黄601无性系,是非常好的适合于沿海沙地条件的树种。 相似文献
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Katherine D. Heineman Ethan JensenAutumn Shapland Brett BogenriefSylvester Tan Richard RebarberSabrina E. Russo 《Forest Ecology and Management》2011,261(11):1820-1832
Tree height and crown allometries reflect adaptations for resource acquisition and structural stability, as well as plastic responses to a heterogeneous environment. While both light and soil resources limit growth and influence competitive responses in tropical forests, the effects of belowground resources on allometries are less understood, especially within the understory. To characterize outcomes of tree competition along an edaphic resource gradient, we quantified variation in height and crown allometries of six Bornean tree species from contrasting regeneration niches (light-demanding vs. shade-tolerant) on two soil habitats (clay-fine loam and sandy loam) within a 52-ha forest dynamics plot. Using empirically-fit allometric parameters and diameter growth rates from plot census data, we modeled tree height and crown area growth over the projected life span of each species. Based on resource competition theory, we hypothesized that tree species specializing on and populations of generalist species growing on the relatively moister, more fertile clay-fine loam soil habitat would have faster height and crown growth rates, compared to those on the sandy loam habitat, regardless of regeneration niche. Among soil specialists and within generalists of both genera, trees growing on clay-fine loam had taller stems and larger crowns at a given age and faster height and crown area growth rates at most sizes than trees on sandy loam. Differences in height and crown growth were driven by the faster diameter growth rates of trees on clay-fine loam, not by differences in height- and crown-diameter allometries, as trees on sandy loam were significantly taller at a given diameter, and differences in crown allometry were not consistent across soil habitats. Characterizing the height and crown growth responses of trees along resource gradients provides insight into the mechanisms that maintain diversity in tropical forests. Our results point to the importance of adaptive and plastic responses to both above and belowground resource availability in determining the allometric growth of trees and suggest that this diversity of responses may contribute tree species coexistence through competition-based trade-off mechanisms and variation in growth among individuals. Additionally, as the importance estimating natural carbon sequestration increases with the escalating effects of anthropogenic climate change, differences in tree growth and architecture across soil habitats also have implications for the approximation of forest carbon storage on heterogeneous tropical soils. 相似文献
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在国营桓仁满族自治县黑沟林场山地,通过2种土壤质地和覆膜措施进行了金叶榆嫩枝扦插试验,结果表明:砂质壤土比黏质壤土,覆膜比不覆膜均能提高金叶榆嫩枝扦插的生长量和成活率。 相似文献
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榆林沙区自然环境恶劣,植被稀少。因此在生态环境建设中不仅要应用乡土树种,还要引进外来优良树种,以丰富榆林市的树木资源,使绿化达到更完美的效果。而如何将乡土树种与外来树种协调应用是关键所在。只有在保护好乡土树种资源的同时,有原则、有目标、有步骤地进行引种,使之不发生生物入侵,才是正确的培育措施。 相似文献
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