华南虎哺乳期母幼行为的初步研究   总被引：2，自引：0，他引：2  

傅文源 《福建林业科技》2002,29(3):62-64

对梅花山华南虎繁育研究所内 4号母虎及其所产幼虎的母幼行为进行了初步研究 ,着重描述了华南虎母幼的各种行为 ,并对其中的一些行为作了初步探讨。母幼间接触的部位主要是头部等感官较敏感区域 ,通过各种接触是建立母幼友好、亲昵关系的主要途径。母虎主要通过哺乳、舔、嗅等行为与幼虎接触 ,其次是拱、衔、护幼行为等 ;而幼虎主要是通过吮乳、舔、嗅闻与母虎接触 ,其次是叫等方式  相似文献   

论先秦时期我国的竹资源及利用   总被引：5，自引：2，他引：5  

关传友 《竹子研究汇刊》2004,23(2):59-64

根据历史文献和考古资料,考证了我国史前时期、夏商周时期竹林资源的分布,论述了先秦时期在生产、生活、文化、兵器等方面对竹资源的开发利用.  相似文献   

毛竹林出笋与幼竹生长发育规律的研究   总被引：8，自引：1，他引：8  

曹福亮  楼崇 《竹子研究汇刊》1991,9(1):64-71

本文以江苏宜兴林场、江西宜丰花桥林场以及南京林业大学下蜀实习林场等试验地内毛竹林出笋与幼竹生长资料和从江苏宜兴气象站抄录整理而成的1976～1986年中每年的11个气象资料为原始材料,定量地对毛竹林出笋及幼竹的生长发育的内在规律性及其与气象因子之间的关系进行了系统的研究。回归分析表明,影响翌年竹林出笋及幼竹生长发育的6个主导气象因子是7、8、9三个月的平均温度、年平均温度、年降水量、温暖指数、日均温≥10℃积温和7、8、9三个月的平均降水量。借助于有序样本聚类分析方法,将竹林整个出笋期划分为三个时期即出笋初期、出笋盛期和出笋末期。最佳拟合求算表明,毛竹幼竹高生长用单分子生长式来拟合精度较高。通过对正态累积函数和概率单位之间关系的研究可知,毛竹高生长在竹笋出土后21天左右进入速生期,竹笋出土后30天左右达高生长高峰期,竹笋出土后38天左右达高生长速生末期。本文还就如何根据幼竹的生长发育规律,采用相应的营林措施来培育速生丰产林等有关问题进行了探讨。  相似文献   

木麻黄皮暗斑螟生物学特性的研究   总被引：4，自引：1，他引：4  

黄金水  黄海清 《福建林业科技》1995,22(1):1-8

木麻黄皮暗斑螟（ＥｕｚｏｐｈｅｒａｂａｔａｎｇｅｎｓｉｓＣａｒａｄｊａ）在福建省一年发生５代，以幼虫于１２月中旬在树干被害处的虫道内越冬（亦有少数以蛹越冬），林间世代重叠现象明显。成虫羽化盛期的温度为３０．３—３４．０℃，相对湿度为７５．７％—８４．３％，平均寿命７．９天，产卵量４５．７粒。卵孵化率９０．５％。幼虫共５龄，具群集性，以第一代幼虫取食量最大，老熟幼虫喜在粪粒层与树干交界部结茧化蛹，蛹期８．５天。皮暗斑螟的天敌有１０余种，其中拟小腹茧蜂在自然界的寄生率达１６％。  相似文献   

细胞分裂素对刨花楠开花的效应研究     

冯建民  何贵平  骆文坚  陈云龙  麻建强 《江西林业科技》2007,(5):14-15

在浙江建德寿昌林场刨花楠天然林中,采用注射细胞分裂素的方法来促进其开花的试验。结果表明:在花芽分化期在树干上注射细胞分裂素6-BA和6-KT能明显促进花芽分化,增加了花量,浓度500 mg/kg和300 mg/kg效果较好,促花效果比较对照增加26.6%￣43.4%,6-BA略优于6-KT。不同处理时期效果差异较大,以6月效果最佳,7￣8月份处理促花效果不明显。  相似文献   

Phenological phases of common beech (Fagus sylvatica L.) and their dependence on region and altitude in Southern Germany     

Christoph Dittmar  Wolfram Elling 《European Journal of Forest Research》2006,125(2):181-188

Long-term observational data of the phenological network of the German Weather Service (DWD) were used to derive the altitudinal dependence of leaf unfolding (LU), leaf discolouration (LD) and the length of the vegetation period (LD-LU) of common beech (Fagus sylvatica L.) in different regions of Southern Germany. Depending on altitude, the vegetation period starts in Bavaria between the 2nd and 24th May with a delay of around 2 days per 100 m altitude increase (averaged over the last 30 years). In Southern Bavaria, LU starts a few days earlier as well as increases slightly faster into higher altitudes than in the northern regions. This can be explained by a more favourable supply of warmth and radiation in the south. The end of the vegetation period, defined here as the beginning of LD, showed no altitudinal dependence, which reflects an interaction of endogenous and exogenous factors as triggers for LD. In the Bavarian Forest region, altitudinal dependences are strongly influenced by sites which are affected by cold-air tailback (‘Kaltluftstau’) was obtained. Hence, phenological gradients should only be derived and applied above a phenological inversion zone. The calculated vertical gradients for LU can be used together with available observational data to estimate the beginning of the forest vegetation period of beech for different altitudes of Bavaria.  相似文献   

Estimation of sequestered carbon in Article-3.4 private planted forests in the first commitment period in Japan     

Takuya Hiroshima  Tohru Nakajima 《Journal of Forest Research》2006,11(6):427-437

The purpose of this study was to predict the likely amounts of carbon sequestration on a national scale for Japan in the Article-3.4 private planted forests of the Kyoto Protocol during the first commitment period. We regarded the planted forests that had undergone silvicultural practices such as weeding, pruning, and thinning since 1990 as Article-3.4 planted forests in accordance with the definition given by the Forestry Agency of Japan. Regression models were developed to predict the forest areas that had undergone silvicultural practices, employing silvicultural subsidies and forest workers' wages as predictor variables. Then the time series changes in the predictor variables were provided by extending their recent trends, with the result being that the forest areas that have undergone silvicultural practices were predicted on the basis of the three scenarios of the variables. Thus, the Article-3.4 forest area was calculated considering overlaps of silvicultural practices over fixed stands, and the area was converted into the amount of carbon sequestration by multiplying it by coefficients such as a volume table, biomass expansion factor, and others. The result implied that Article-3.4 private planted forests were expected to sequester 8.16–8.87 Mt-C year⁻¹ during the first commitment period. These amounts cover 63%–68% of the carbon sequestration goal by land-use change and forestry activities capped under the Marrakesh Accords. To realize this prediction, it is important to provide a sufficient silvicultural subsidy to last until the end of the first commitment period and to implement silvicultural practices on the forest stands that have not undergone such practices since 1990.  相似文献   

The impact of timing and duration of grass control on growth of a young Eucalyptus globulus Labill. plantation     

Adams  P.R.  Beadle  C.L.  Mendham  N.J.  Smethurst  P.J. 《New Forests》2003,26(2):147-165

Interference by an introduced grass, Holcus lanatus L. (Yorkshire fog grass) in a young E. globulus (Tasmanian blue gum) plantation was investigated. The objectives were to determine (1) the critical period of competition, and (2) how the timing and duration of competition was related to the interaction between tree growth and resource availability. This was investigated during the first two years of establishment. Weed interference was severe with height and diameter growth of weedy trees being 52% and 40% of weed-free trees, respectively, at age two years. Most growth losses occurred during the first year. The critical period of weed interference was from planting to age 18 m and effective weed control was required for this period to maximise tree growth potential. The application of nitrogen to weedy trees promoted a significant growth response suggesting that competition for nitrogen was occurring. There was no significant response to level of irrigation. The use of critical period analysis is discussed.  相似文献   

马尾松毛虫越冬代成虫种群动态监测     

胡中成  楼晓锋  赵雨妹  邵国秀  蒋远飞  吴晓东 《江西林业科技》2006,(1):27-28

马尾松毛虫是一种主要林业有害生物,通过黑光灯诱蛾试验对越冬代马尾松毛虫成虫种群进行动态监测,采用t检验法进行样本差异显著性检验,在可靠性95%的情况下差异显著,分析得出羽化盛期为5月24日前后,这段时间为黑光灯诱蛾的最佳时期。  相似文献   

不同嫁接方法对核桃苗嫁接成活率和出圃率的影响     

《湖北林业科技》2015,(4):12-13

为探讨适宜保康县核桃苗木繁育方法,采用春季劈接和夏季留放水口露芽接、不留放水口露芽接、留放水口包芽接、不留放水口包芽接4种芽接方法进行嫁接,比较5种方法的成活率和出圃率,结果表明:在保康及附近区域,夏季采用芽接方法能有效地提高嫁接成活率和出圃率。  相似文献