共查询到20条相似文献，搜索用时 203 毫秒
1.
2.
对全省18个县24块新营建的降香黄檀林分在2011~2013年连续开展寒害和生长调查,分析结果表明:降香黄檀林分早期生长较快,树高年均生长可达1.05 m,胸径年均生长达1.03 cm,但是个体间差异较大;当最低温在0~5℃之间并保持5~10天时,降香黄檀出现较为严重的寒害,林分寒害等级与月均温、海拔、树高和林龄呈极显著的负相关,与纬度、胸(地)径呈极显著的正相关;林分所处地形对寒害等级也有一定影响;受寒害的林分在次年寒害较轻的情况下可恢复生长。依据各地寒害等级,并结合各地气温及寒害恢复情况,绘制广东省降香黄檀人工林寒害分区图,将全省划分为适宜栽培区、次适宜栽培区、风险栽培区和不适栽培区四种类型。 相似文献
3.
基于树木年轮学方法,在哈巴雪山海拔上、下限采集高山松年轮样本,建立差值年表并分析其与气候因子关系,以揭示影响该区域高山松(Pinus densata)径向生长的主要气候因子。结果表明:海拔上限高山松径向生长主要受上年8月水热状况影响,还与当年3月平均最高温呈显著正相关、与5月平均温和6月降水均呈显著负相关;海拔下限高山松径向生长主要受当年5月水热状况影响,还与上年12月降水呈显著正相关;哈巴雪山高山松径向生长与气候因子关系较为稳定。通过对横断山区树轮研究的补充,可为未来气候变化下森林保护提供理论依据。 相似文献
4.
5.
降香黄檀在广西南亚热带地区的引种 总被引：16，自引：6，他引：16
通过对降香黄檀在广西的引种驯化及其种质资源保存情况的调查,结果表明,降香黄檀在北移5°左右引种到广西南亚热带地区是成功的,能耐受冬季0℃左右的极端低温,适应在≥10℃年积温为7 200℃以上的地区正常生长。在岩溶石灰山地引种造林,不但能适应气候干旱的石灰岩造林区,而且能适应生长在pH值较高的棕色石灰土;树木生长发育正常,能开花结果,生长速度与原产地相似,能长成大径级用材,24年生林分平均高16.8 m,年均高生长0.70 m,平均胸径24.1 cm,年均生长1.00 cm。 相似文献
6.
通过收集云南省小桐子主要分布区23个县(市)的资源,分析小桐子的地理空间分布格局和种仁含油率与海拔、土壤类型、土层厚度及坡向等因素的关系。结果表明:云南小桐子在海拔400～1900 m均有分布,但主要集中在海拔800～1700 m;分布纬度21°57'—26°59'N、经度98°49'—103°7'E,在纬度24°13'—26°9'N、经度100°1'—102°13'E区域分布较集中。海拔1401～1600 m的小桐子含油率显著高于其他海拔;不同类型土壤的小桐子含油率有显著差异,其中耕作土的小桐子含油率显著高于其他土壤;而不同坡向、不同土层厚度对小桐子含油率的影响不显著。 相似文献
7.
根据树种的生物学特性、影响树木生长的主要气候因子，利用层次分析法确定各因子对树木生长影响的权重，然后，分别计算引种区域内各地与种源产地之间的气候灰色关联度，将山西省有关县市划分为最适区，适宜区，基本适区，不适区，确定太原为毛泡桐引种的北限。其结果与模糊相似优先比法结果完全一致，说明利用灰色关联度进行引种区划是可靠的，为林木引种区划提供一种简便，实用的方法。 相似文献
8.
【目的】研究峨眉山不同海拔冷杉Abies fabri径向生长对气候变化的响应规律。【方法】以冷杉为研究对象,用树轮生态学的方法对峨眉山不同海拔的冷杉进行年轮采样、处理与分析,比较不同海拔冷杉径向生长特征及其与各气候因子之间的关系。【结果】年表统计数据表明,4个年表均具有较高的可靠性,可以用于树木生长与气候关系的研究。不同海拔冷杉径向生长与气候的关系具有明显的海拔差异,海拔2 400 m处冷杉径向生长与当年7月的温度呈显著正相关;海拔2 800 m处冷杉径向生长与当年4-9月的帕尔默干旱指数(PDSI)呈显著正相关;海拔2 900 m处冷杉径向生长与前一年9月和当年4月的温度呈显著负相关,与当年1-9月的PDSI均呈显著正相关;海拔3 000 m处冷杉径向生长和当年3-4月温度呈显著负相关,与当年6-7月的PDSI和当年4月平均相对湿度呈显著正相关。【结论】峨眉山高海拔的冷杉包含有更多的环境信息,对气候变化的响应也更为敏感;高海拔区域冷杉径向生长受到水分的强烈限制,而低海拔区域冷杉径向生长主要受温度影响;冷杉衰亡与气候因子的变化密切相关,随着区域气候的变暖,高海拔地区冷杉可能会进一步衰退。该研究揭示了峨眉山不同海拔冷杉生长动态及其对气候变化响应的敏感性差异,为全球气候变化背景下冷杉林的保护与适应性管理提供科学参考。 相似文献
9.
降香黄檀引种试验初报 总被引：3，自引：0，他引：3
根据降香黄檀生物学和生态学特性及仙游县的生态环境条件对其进行引种试验,初步结果表明,降香黄檀在仙游县四旁和低山(海拔高200m~300m)引种生长表现正常,造林成活率达98%以上,8个月苗高生长量达1.67m;地径达1.86cm,未发现冻害,能安全过冬,对气候适应性强,为在仙游县大力发展该树种提供科学参照。 相似文献
10.
《中南林业科技大学学报(自然科学版)》2017,(8)
对6年生49个家系的降香黄檀幼林进行了生长和心材形成状况调查,结果表明:(1)不同家系间树高、胸径、枝下高和冠幅生长存在极显著差异。白沙28、白沙29、五指山60、通什63和东方98五个家系在生长性状中表现最好,可作为降香黄檀采种育苗或组织培养的材料加以重点研究;(2)海拔与胸径呈显著正相关,即一定范围内较高海拔的家系能有较大的茎粗生长;年均降雨量与树高、枝下高和冠幅存在极显著的负相关,干旱地区的家系生长表现具有一定的优势;(3)心材检测结果表明6年生林分胸径在8 cm以下没有心材形成,胸径在8~10 cm范围内的部分有少量心材形成,胸径大于10 cm的全部有心材形成,其时采用石油醚浸渍法提取的挥发油含量为5.31%;(4)采用气相色谱-质谱联用仪分析挥发油的成分及相对含量,鉴别出16种化学成分,占挥发油总量的48.47%,其中含量最高的是橙花叔醇,相对百分含量为26.38%。 相似文献
11.
[目的]为了进一步了解不同种源的樟子松在帽儿山地区的生长差异,研究该地区气候因子对樟子松径向生长的影响,本文建立了来自于阿尔山、高峰、红花尔基、卡伦山、图强罕达盖和金山等7个种源樟子松树轮年表。[方法]通过年轮-气候响应分析、相关分析、主成分分析,探讨了不同种源樟子松径向生长与气候因子的响应差异。[结果]表明:7个种源地樟子松树轮年表整体变化趋势基本相似,但局部也有不同之处,除图强种源外,其余6个种源地樟子松在生长初期年轮宽度呈增加趋势。阿尔山、高峰、红花尔基和卡伦山种源地樟子松径向生长与当年2月平均温度显著正相关,罕达盖种源地樟子松径向生长与前一年4月平均温度显著正相关;高峰、图强、卡伦山种源地樟子松径向生长与当年6月降水显著正相关,阿尔山、高峰、金山、卡伦山、红花尓基、图强种源樟子松的径向生长主要与前一年8月降水显著负相关。[结论]多数种源的樟子松在初期径增长较快,与当年2月份的温度和6月份的降水量有正相关的响应性,而与前一年8月份的降水量有负相关的响应性。 相似文献
12.
红锥天然分布区气候区区划 总被引：1，自引：0，他引：1
文章以1950—2000年世界各地气象站19个气温和降水量相关气候信息的平均值为基础,通过主成分分析和聚类分析方法,对红锥(Castanopsis hystrix)14个主要分布区内的22个气象样点进行气候区划.结果表明,纬度与气温的季节性呈显著性正相关(0.71),与最冷月最低温呈显著性负相关(-0.72);年最干月降水量与气温年较差呈显著性正相关(0.72),与最干季平均温呈显著性负相关(-0.71);19个因子可以综合为4个主成分,前4个主成分累计贡献率达80%,表明最冷季降水量、最暖季平均温、最暖季降水量和最暖月最高温具有较强的代表性;根据系统聚类将22个气象样点划分为四大气候区:南亚热带地区、中亚热带地区、西亚热带地区和热带北缘地区,这4个气候区在水、热两大气候因子上均有较大的差异. 相似文献
13.
中山杉引种研究进展及其在昆明地区的应用现状 总被引：1，自引：0，他引：1
综述中山杉无性系杂交选育及常规育苗、抗逆性、物候期、生长节律及引种推广适应性研究概况.目前其引种范围为东经102°~122°,北纬24°~39°,在土壤含盐量〈0.2%,pH值〈8.5,年均温14.5~21.9℃,年极端低温不低于-20°的广大地域范围中山杉均能正常生长,表现稳定.中山杉无性系在昆明地区的引种栽培试验结果表明,其在昆明亦具强的生态适应性和抗逆性,成为昆明地区一个新型的耐水湿乔木树种.文章进一步讨论了在昆明地区建立中山杉良种采穗圃基地以及为提高中山杉无性繁殖能力而营建中山杉无性系示范林等问题. 相似文献
14.
山西华北落叶松天然林的地理分布和种群变异规律的研究 总被引：7，自引：0，他引：7
对山西省内华北落叶松天然林调查,得到了41个调查点的生长量、球果、针叶和种子等性状的材料,并对这些数据进行了单相关分析和多元回归分析。结果表明:9个性状林分间的差异达到极显著水平,有的性状与经纬度、气候因子呈显著的相关。总的趋势是:随着气候干旱、寒冷、每簇针叶数目越来越多,呈单向渐变群的变异模式,且果鳞数目逐渐增多;年生长量也呈现由东北向西南逐渐增加之趋势,尤其是胸径生长量与海拔呈显著的正相关。多元回归分析表明:纬度、年均温,1月均温是影响生长量的主要因子:而影响每簇针叶数目变化的主要是7月均温和纬度。同时还筛选出影响变异的主导生态因子。 相似文献
15.
Yueh-Hsin Lo Juan A. Blanco Brad Seely Clive Welham J.P. Kimmins 《Forest Ecology and Management》2010
Climate is a main driving factor of the formation of annual tree-rings, but which climatic variables are the most influential on radial growth may vary among species and sites. To explore these interactions, tree-ring chronologies along a major elevation gradient were examined for three tree species in southern interior British Columbia (Canada): Pseudotsuga menziesii, Pinus contorta, and Picea glauca × engelmannii. We used correlations and linear and multiple regressions to explore the relationships between tree-ring radial growth and climate variables in the area from 1922 to 1997. All correlation coefficients between ring chronologies and monthly climatic variables were medium to low (from −0.3 to 0.4); nevertheless, moderate but significant trends could be identified. Multivariate models explained up to 53%, 43% and 32% of radial growth variability for P. contorta, P. menziesii and P. glauca × engelmannii, respectively. All three species showed similar radial growth–climate patterns across the elevational gradient, but they had different details that made ring width–climate relationships species-specific. Precipitation-related variables were more related to radial growth at low-elevations, changing into temperature-related variables at high-elevations. Tree-ring width for all three species was primarily and significantly affected by climate variables from the year previous to the growing season and only secondly by current year conditions, but the critical months varied for different species and altitudes. Winter precipitation also affected radial growth, either as a source of water or as a possible agent of physical damage. Although our work showed significant climate influences on breast height tree radial growth, our results also indicated that other site factors such as microclimate or stand dynamics can be as or more important than climate variability. 相似文献
16.
17.
为研究不同产地闽楠（Phoebe bournei）幼苗生长性状的变异规律及其与地理、气候因子的关系,以来源于6个省区的12个种源的种子培育的幼苗为试验材料。研究分析了闽楠幼苗苗高、地径、生物量等性状的种源差异,苗期生长性状与种源产地气候或与地理因子间的相关性以及各性状的相关性。结果表明：参试种源间生长差异显著,这些差异主要由遗传因素制约;地径、地下生物量与经度呈显著负相关关系,地径与海拔呈显著正相关关系;各观测性状与无霜期呈显著或极显著相关关系;苗木苗高、地径、生物量等性状之间呈显著或极显著相关关系。根据聚类分析结果,供试的12个种源可划分为优、良、中、差4类,其中广西、贵州种源具有较明显的生长优势。综合分析结果表显示：闽楠各种源间存在明显的遗传分化,地理隔离导致幼苗的生长性状变异丰富,西南地区种源普遍生长较好。 相似文献
18.
Parkia biglobosa is a traditional economic tree legume of considerable multipurpose importance in the sudano-sahelian region in Africa. The species grows in multiple climatic zones with precipitation ranging from 600 to 2,500?mm a year and its natural distribution extends from Senegal and Guinea in West Africa to Uganda in Central Africa. In the present paper, a range wide sample of 25 provenances of P. biglobosa was tested in Burkina Faso, West Africa at two sites; Gonse (latitude 12°25′N; longitude 1°20′W; altitude 280?m) in the north-sudanian zone and at Dinderesso (latitude 11°18′N; longitude 4°35′W; altitude 425?m) in the south-sudanian zone. Based on analysis of survival and growth traits, we provide evidence of substantial genetic differentiation between P. biglobosa populations within West Africa. Height growth was best at Gonse, while the survival rate was higher at Dinderesso (61%) compared to Gonse (35%). Links between geographical parameters and the provenances performance were significant, and interesting geographic patterns were observed. Our results point towards superior fitness of the local Burkina Faso populations, and we speculate that presence of a continuum of locally adapted populations can be a part of the explanation for the species’ ability to thrive under quite different climatic conditions across West Africa. Based on the findings, we suggest recommendations for seed deployment and conservation strategies of the species in the West African Sahel. This is particularly important when considering the on-going climate change. 相似文献
19.
《Forest Ecology and Management》1997,98(1):77-87
A dendroclimatological study was carried out in the 80-year-old Fernow Experimental Forest of the U.S. Forest Service near Parsons, West Virginia (39°20′N, 79°40′W). The relationship between radial and basal area increments and corresponding monthly, seasonal, and yearly mean air temperature and precipitation were obtained over 53 years for four species: black cherry (Prunus serotina Ehrh.), northern red oak (Quercus rubra L.), white ash (Fraxinus americana L.), and yellow poplar (Liriodendron tulipifera L.). These species show positive growth responses to rainfall of previous summer, autumn, and current summer. They show significantly inverse correlation to air temperature of the current growing season. The indices of radial increment show a close correlation to those of basal area increment. However, in our analyses, basal area increment indices are more sensitive to climatic variations than radial growth indices. 相似文献
20.
Maria-Barbara Winter Barbara Wolff Hagen Gottschling Paolo Cherubini 《European Journal of Forest Research》2009,128(6):531-542
This dendroecological study used time series of climate and radial growth and nut production of Juglans regia to investigate the relationships between these parameters. More than 200 trees growing at sites of different altitude, aspect,
inclination and human impact intensity were sampled in walnut-fruit forests of the Jalal Abad region in Southern Kyrgyzstan.
Tree rings were dated and ring widths measured. Wide and narrow tree rings, so called positive and negative pointer years,
could be explained by climatic events. The mean annual increment differed significantly in different regions and altitudes.
The highest values could be found in plantations and at higher altitudes (1,700–2,000 m a.s.l.). Analysing the relationships
between nut crop yields and annual increment, we found a significantly positive correlation between nut crop of the current
year (x) and ring width of the previous year (x − 1). This relationship is influenced by climatic conditions, and may change in the future if climatic conditions in the
region will change. Our study shows that Persian walnut (Juglans regia L.) of South Kyrgyzstan can be used in dendrochronological studies, and illustrates the influence of site conditions and
management practices on radial growth of this tree species. 相似文献