木麻黄皮暗斑螟生物学特性的研究

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％。     

细胞分裂素对刨花楠开花的效应研究

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。     

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

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.     

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

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.     

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

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.     

马尾松人工中龄林施肥肥效与增益持续性研究

通过13a的观测资料表明,在红壤地区施N肥对马尾松中龄林生长不利,施P、K肥有利于马尾松中龄林生长,且肥效持续时间长,最佳处理组合为N1P3K2,即每公顷施N、P、K分别为0、240、65kg.其中P3水平树高、胸径、蓄积12a定期生长量比对照P1水平分别高6.1%、15.0%、12.3%.施肥一定时间后林地质量仍是马尾松生长密切相关的因子,施肥不会促进马尾松中龄林在空间层次上的分化.     

不同嫁接方法对核桃苗嫁接成活率和出圃率的影响

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。     

论封山育林的规划设计

封山育林是培育森林资源的一条十分重要的途径，文中就封能林的范围，。封山育林规划设计中的空间配置，封育年限，育林措施等几个问题进行了探讨，提出了自己的观点。     

棉花早期热激处理与高温期蕾铃脱落关系的初步研究

研究了棉花早期热激处理与高温期蕾铃脱落的关系，结果表明：早期热激处理有助于高温期棉株体内产生更丰富的热激蛋白，从而提高棉株的耐热程度，降低脱落率达１．７～３．０个百分点。但不同的品种，早期热激处理的最适生长阶段不同品种有差异     

关于杂稻制种幼穗分化期多效唑施用效果的数学模型研究

试验采用饱和D—最优计划设计，研究了多效唑使用剂量、浓度、时期与产量、包颈率、结实率、花调效果等的关系，分别得出了它们的回归数学模型。研究结果揭示了多效唑是以影响始穗期、包颈率和结实率而最终影响到产量的。综合分析认为，要延迟母本始穗期，减少包颈率、提高结实率，夺取制种高产多效唑施用的最佳剂量为153克．浓度322ppm，时期为幼穗分化第四期。