共查询到19条相似文献，搜索用时 343 毫秒
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《林业实用技术》2017,(1)
以祁连山区青海云杉(Picea crassifolia)为样本,建立了青海云杉树木年轮宽度年表,应用相关分析和响应函数分析等年轮气候学方法,研究了青海云杉径向生长对气候变化的响应。结果表明:青海云杉年轮宽度与当年3-8月的平均气温呈正相关关系,特别是与3月平均气温的相关性最为显著(P<0.05);与当年3、5月的降水量呈显著的正相关关系(P<0.05);与当年4月日照时数呈显著的正相关关系。响应函数分析表明:青海云杉年轮宽度与上年10月和当年3、5月平均气温、上年12月和当年5、8月降水量、当年4、7月的日照时数存在显著的相关性(P<0.01)。综合来看,祁连山区青海云杉生长同时受春季温度、夏季降水和春季日照的影响明显。 相似文献
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树木年轮与气候变化关系研究 总被引：8，自引：0，他引：8
综述树木年轮分析在温度、降水序列和大气CO2浓度变化研究中的应用概况,着重探讨气候变化对树轮宽度、密度和稳定同位素组成的影响,如温度、降水对树木生长的"滞后效应"、"幼龄效应",并就树轮年代学在气候变化研究中存在的问题和研究前景作简要探讨,提出今后年轮气候学的研究应结合中、小时间尺度的树木生理生态学特性进行,需阐明树木和环境各因子之间的相互作用机理及量化关系,应加强各类代用资料与仪器观测记录结果的对比分析,并加强对年轮气候模型的验证,研究方法应由经验性分析转向机理性研究,并注重多学科知识的综合运用. 相似文献
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气候变化和长白山岳桦树线树木年轮的关系 总被引：1，自引：0，他引：1
通过对生长在海拔1950m岳桦的树轮生长特征和气候关系的分析,评价了长白山树线对气候因子的敏感性。结果表明,长白山岳桦树线对气候因子有明显的敏感性,与其它研究不同的是,影响树线处岳桦生长的主要气候因子并不是当年夏季的温度,而是上年冬季的平均最低温度和当年3月的温度。尽管研究区降水量很大,但年轮宽度与上年冬季和当年春季的降水呈显著相关。另外,由于气候因子的年际变化对岳桦径向生长没有明显的影响,因此自20世纪80年代以来的年平均温度的升高并没有在年轮宽度上表现出持续的增加。图2表5参39。 相似文献
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川西亚高山岷江冷杉和铁杉年轮对气候因子的响应 总被引：3，自引：0，他引：3
研究四川卧龙亚高山森林岷江冷杉和铁杉树木年轮与气候因子的关系.结果表明:川西亚高山针叶林树木径向生长主要受气温的制约,卧龙地区岷江冷杉树轮宽度序列与当年2和4月月平均气温显著正相关(P≤0.05),而与多数月平均降水量和月平均相对湿度负相关;铁杉树轮宽度序列与上一年7月和当年2--4月月平均气温显著正相关(P≤0.05),与上一年10月和当年5月月平均降雨量显著正相关(P≤0.05),而与上一年7月及当年4和9月月平均相对湿度显著负相关(P≤0.05). 相似文献
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树木生长和立地环境密切相关并受气候变化的影响,树木年轮宽度、密度及稳定同位素等作为反应气候与环境变化的重要参数指标,已被广大生态学家所重视并应用。文章总结了几种主要的树木年轮分析方法及在气候变化中的应用,着重探讨了气候变化对树木年轮结构的影响,以及树木年轮分析森林干扰研究中的应用,并对未来全球变化中的树木年轮研究的前景做了简要的分析。 相似文献
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以北京地区板栗为材料,建立板栗年轮宽度、早材宽度和晚材宽度3项年轮结构指标的标准化年表和差值年表,分析板栗径向生长与气候因子间的相关关系和响应,并对可重建的气候因子进行筛选。结果表明：板栗年轮宽度和晚材宽度的年表质量明显好于早材宽度年表,其中差值年表优于标准化年表,其样本总体代表性达到93%,第1主成分方差解释量达到40%。差值年表与气候因子的相关分析和响应分析结果表明：年轮宽度、早材宽度和晚材宽度与各项气候因子间响应关系不同,在将来重建过去气候时,可利用年轮宽度和晚材宽度重建当年6月的温度,晚材宽度还可以重建当年7月的降水,早材宽度重建当年3月和4月的温度。 相似文献
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马尾松年轮宽度和木材基本密度的种源变异及早期选择 总被引：2，自引：1，他引：1
针对浙江省淳安县姥山林场的24年生49个产地马尾松种源试验林,采集植株胸高处木芯,分析种源年轮宽度和木材基本密度的年龄效应。结果表明:除近髓部1～5轮年轮段的木材基本密度外,其他年龄段的年轮宽度和木材基本密度皆存在显著的种源差异,进一步说明通过种源选择可实现木材生产力和木材基本密度的遗传改良。不同年轮段木材基本密度的种源变异相对稳定,而年轮宽度的种源变异则易受环境的影响,幼龄材年轮宽度的种源变异较小,仅为成熟材的63.29%。来自不同种源区的种源年轮宽度的径向变异规律相似,皆表现出先增后减的变化趋势,在6～10轮达到最大值;年轮木材基本密度径向变化规律则与年轮宽度不同,表现为随年龄增长先增加后逐渐稳定的S型变化趋势,并据此筛选出广西横县、恭城、忻城,广东乳源和福建南靖5个木材基本密度径向均匀性高的纸浆材优良种源。不同年轮段年轮宽度和木材基本密度的相关分析显示,约在8年生选择径向生长快的种源会明显地降低其木材基本密度。基于性状早晚相关分析,认为可在7年生时先淘汰生长较差的种源,在12年生再开展种源生长和木材基本密度的联合选择。 相似文献
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[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
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Jin-Mei Xu Fu-Cheng Bao Jian-Xiong Lv Rong-Feng Huang You-Ke Zhao Evans Robert 《中国林学(英文版)》2013,15(4):310-319
In order to investigate the response to climate changes in radial growth of Picea crassifolia at the lower tree line in the middle Qilian mountains in northwestern China, relationships of standardized chronologies of annua ring, earlywood and latewood widths with mean monthly temperature and total monthly precipitation were analyzed by ways of correlation and pointer year analyses. The results show that annual ring, earlywood and latewood widths are significantly negatively correlated with mean monthly temperature in June and Juy. Annual ring and eadywooc widths are significantly and positively correlated with tOtal monthly precipitation in March, May and June and negatively correlated with total monthly precipitation in September. Latewood width is less sensitive to climate changes than the width of earlywood and insignificantly sensitive to precipitation. The results of pointer year analysis revealed that whet summer temperatures are higher than the mean summer temperature synchronization and the summer precipitatior lower than mean summer precipitation synchronization, narrow annual rings are formed. Wide annual rings are formec~ when summer temperatures are lower than the mean summer temperature synchronization and summer precipitation higher than mean summer precipitation synchronization. The results indicate that more precipitation in the spring and summer is helpful for radial growth while warmer summer restricts radial growth of P. crassifolia at the lower tree line in the middle Qilian mountains. 相似文献
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Tree-ring chronologies were developed fromAbies mariesii Masters andPicea jezoensis ssp.hondoensis (Mayr) P. Schmidt collected at different altitudes of Mt. Norikura, central Japan. The tree-ring parameters of ring width and maximum density were measured by soft X-ray densitometry. The measurement series were detrended by fitting a 33-year cubic smoothing spline and autoregressive model. The correlation between species and between sites showed different responses of the species to climate in terms of ring width and maximum density. The correlation coefficient between sites within a species was higher than that between species for a site in the ring width, and the coefficient between species for a site was higher in maximum density. The correlation coefficient between tree-ring chronology and monthly climate data set showed different responses of radial growth to climate. The different response was probably explained by the difference in the length of the growing season. High summer temperature increased the maximum density of the two species and the radial growth inAbies mariesii. Summer precipitation correlated negatively to maximum density, but it did not affect the ring width of either species. The climatic signals could be extracted from ring-width and maximum-density chronologies of both species. 相似文献
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《林业研究》2016,(5)
A dendroclimatic study was conducted in the treeline ecotone of Barun Valley,eastern Nepal,to determine the tree-ring climate response and ring width trend of Abies spectabilis.A 160-year-old chronology,from 1850 to 2010,was developed from 38 tree-ring samples.No higher growth in recent decades was observed in tree-ring width in this area.The mean temperature of the current year in February and in the combined winter months of December,January,and February showed significant positive correlation with tree-ring width,although no significant correlation was found between tree-ring width and the precipitation pattern of the region.This tree-ring climate response result is different from that in other studies in Nepal,which could be attributed to location and elevation. 相似文献
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There has been a decline in tree growth since the operation of factories atPinus thunbergii forests around a petrochemical industrial complex in Korea. This study was carried out to investigate the effects of air
pollution on tree ring width and ring density ofPinus thunbergii. Soft X-ray densitometrical method was used. Decline of ring width was the highest during 3 years immediately after the operation
of factories. The percentage of decrease was almost bigger immediately after operation as compared with before. Maximum density
(MAXD), and the difference (DD) between maximum density and minimum density (MIND) generally decreased since operation of
factories, while minimum density increased in the beginning of operation of factories. There was a significant correlation
between ring width and high temperature, and precipitation in the beginning of growing season, respectively. There was also
a negative correlation between annual mean concentration of SO2 and ring width at 5% level (r=−0.627*). It is suggested that the decline of ring width after operation of factories was due to compound factors of air pollution
and climate. The effect of other factors should be still more studied.
A part of this paper was presented at the International Workshop on Asian and Pacific Dendrochronology on March 4–9, 1995
in Tsukuba (Forestry and Forest Products Research Institute), Japan. 相似文献
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Dario Martin-Benito Hans Beeckman Isabel Cañellas 《European Journal of Forest Research》2013,132(1):33-45
We investigated the influence of climate on the ring width and xylem anatomy of two co-occurring pines (Pinus nigra Arn. and P. sylvestris L.) in the mountains of east-central Spain in order to test their utility for dendroclimatic reconstructions. We developed chronologies of ring width, mean lumen diameter and mean cell-wall thickness (in the earlywood, latewood, and the total annual ring) and the number of cells between 1960 and 2006. Drought, expressed as the standardized precipitation-evapotranspiration index (SPEI), was the main climatic driver of tree radial growth, although trees were also sensitive to temperature (negative effect in previous autumn and current summer) and precipitation (with a general positive effect). P. sylvestris response was stronger to climate of the current year, whereas the effect of previous-year climate was more important for P. nigra. Warm and dry summers reduced ring width, tracheid lumen, and wall thickness in both species, whereas warm winter-spring temperatures had the opposite effect, primarily for P. sylvestris. Previous-year or early-season conditions mainly affected earlywood features, whereas latewood was more responsive to summer climate. Overall, climate appeared to be a stronger limiting factor for P. sylvestris. During periods of drought, cell-wall thickness was reduced while lumen width increased in the latewood of P. sylvestris. This could compromise its hydraulic safety against drought-induced cavitation as our site was close to the southern and dry edge of the species distribution area. Our results suggest that anatomical variables record different and stronger climate information than ring width variables, especially in P. sylvestris. Reconstruction models for SPEI at the 3-month scale were developed for July–August and September–October using principal components regression. The best models included anatomical and width variables of both pine species suggesting that tracheid chronologies can be useful for drought reconstructions especially at mesic sites or with species that encode a mixed drought and temperature-precipitation signal. 相似文献
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Zhenju Chen Yu Sun Xingyuan He Wei Chen Xuemei Shao Huayu Zhang Zhongyu Wang Xiaoyu Liu 《Frontiers of Forestry in China》2008,3(4):381-392
Taking Chinese pine in Qianshan Mountains as a sample, the tree ring width chronology including Standard, Residual, and Arstan
chronologies was established. The results show that the tree ring width of Chinese pine is highly correlated with the temperatures
from May to July and from September to November. Statistically significant positive correlations were observed between tree
ring width and the extreme minimum temperatures in July and mean minimum temperatures in September. The chronology was significantly
or very significantly correlated with extreme minimum temperatures in December and the following January, with mean minimum
temperatures in January, with annual precipitation and with precipitation in April, May and the following December. The Chinese
pine responded strongly to the monthly/yearly water vapor pressure and relative humidity. Annual and largely monthly evaporation
in April–July had a negative effect on tree growth, and was particularly striking for evaporation in April–July. The narrow
tree rings recorded by the chronology demonstrated the 30 occasions of extreme drought since 1800. The growth of Chinese pine
in the Qianshan mountains were also affected by climate changes on a hemispheric and global scale. There were 11-, 23-and
50-year-common periodicities between the chronology and solar activity and 10-, 20-and 45-year-common periodicities between
the chronology and geomagnetic activity.
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Translated from Chinese Journal of Applied Ecology, 2007, 18(10): 2191–2201 [译自: 应用生态学报] 相似文献
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[目的]为选择适合试验区域未来气候变化条件下生长的杉木种源,[方法]运用年轮气候学方法,研究52个杉木地理种源3个树轮宽度指标对气候因子的响应。[结果]整轮宽度、早材宽度和晚材宽度与年平均气温的响应呈强负相关关系,相关系数最大值分别为-0.515、-0.590和-0.451;整轮宽度、早材宽度和晚材宽度与年最高气温均呈强负相关关系,相关系数最大值分别为-482、-0.624和-0.499。[结论]未来试点年平均气温有升高的趋势,这将会在一定程度上抑制杉木的径向生长,而选择对温度响应不太敏感的湖南江华、广西博白和广西资源种源在试验林所在区域进行造林,将是解决这一问题的有效途径。 相似文献