直径生长潜力模型的研究

文章运用理查德生长曲线构成的遵守加法组合和乘法组合的非线性模型，对日本落叶松等3个树种进行了立地质量评价的尝试。结果表明，在森林立地质量评价的诸多方法之中，直径生长潜力仍然不失为一种应用简便和行之有效的方法。     

探测树势的电测技术--电容法

1994－1999年，对油松、侧柏、桧柏、白皮松、黑松、银杏等树种进行了树林电容测定。结果表明：树体电容参数不仅能准确地反映树木当时的生理状况，而且可将一个抽象的生长势概念变成一个具体数量，来进行数量比较与统计分析，在林业生产管理上有广泛的应用前景。     

Evaluation of potential land productivity in Wulushan,West China

The general situation of the total land resources in Wulushan, West China was studied by field investigations with the aid of a GIS software, called Region Manager. The current status of land use in Wulushan is described. The potential land productivity was evaluated by a fuzzy comprehensive method, We take each plot as a basic unit of evaluation on the basis of an index system of land resources in Wulushan which was developed from the investigation data. Evaluation of potential land productivity is the key part of land management. A guideline is presented in this paper for a proper utilization of the land resources and to develop the productive capacity of the land.     

Effect of water potential on fruit body formation ofLentinula edodes in sawdust-based substrate

The influence of substrate water potential () on the growth and fruiting of three genotypes of shiitake (Lentinula edodes) was investigated. A slight reduction of (–0.5MPa) stimulated mycelial and colony growth on liquid, agar, and sawdust-based substrates.L. edodes has been found to grow well at a around –0.5 MPa, which corresponds to a moisture content around 55%. A small decrease in at the final vegetative growth phase had positive effects on flush quantity. The substrate was significantly affected by the interaction between genotypes and spawn run time. The of well-colonized mature substrate was –0.7MPa before and –4.OMPa after the fruiting. The rose again to –0.7MPa during rapid absorbance of water by soaking, and this rise was repeated during the second and third flushes. It is suggested that the water-holding capacity of a substrate is related to culture maturity. Excellent water-providing capacity (higher) is expected in the substrate of well-matured cultures with a high density of mycelial colonization.Part of this paper was presented at the 46th annual meeting of the Japan Wood Research Society, Kumamoto, April 1996     

西南桦生物学特性及发展前景

分析了西南桦生态学特征及其生态经济价值,并对西南桦的发展前景进行了评价。     

Effect of CCC and daminozide on growth of silver birch container seedlings during three years after spraying

Applications of growth retardants, daminozide and CCC (chlormequatchloride), were studied in order to determine their effects on morphology and post-planting growth of silver birch (Betula pendula Roth) container seedlings. Daminozide was sprayed once (on 28 June at concentrations of 1.0 – 6.0 g l^–1) and CCC was sprayed twice (on 29 June and 27 July at concentrations of 0.5–3.0 gl^–1). Height growth, morphology of seedlings at the end of the growing season, the shoot and root growth potential the following spring and field performance during the following seasons were measured. During the first summer in the nursery, both daminozide and CCC retarded height growth,but daminozide was more effective. The effects of compounds on stem diameter during the summer of application were small. Neither of the compounds affected the field performance of seedlings. The most suitable applications for retardation of height growth, without negative effects on other morphological variables, were 4 g l^–1 (32 mg per seedling) for daminozide and 2 g l^–1 (16 mg per seedling), sprayed in two applications, for CCC.     

滇中地区引种牡丹的生态分析

通过比较中原牡丹品种、甘肃紫斑牡丹品种和丽江牡丹品种在引种地的枝条实存率、成花率、休眠芽萌动情况等生长发育表现 ,结合滇中气候特点和各品系的生态习性及生长发育情况分析 ,确认在本地区具有的引种生态潜力。建议在滇中地区引种丽江紫、脂红等牡丹品种较适宜。     

Potential long-term growth gains from early clump thinning of coppice-regenerated oak stands

A study was established in the Missouri Ozarks to evaluate coppice regeneration of oak. Five years after a 32-year-old stand was clearcut and regenerated naturally through stump sprouts, the dominant sprout on each stump was identified based upon height. Treated plots were thinned to the single dominant sprout on each stump whereas control plots were not thinned. Twenty-five years later the largest 247, 371, 494, and 618 stems per ha were examined and height of the dominant sprout at age 5 was found to be strongly related to dbh at age 30 in both thinned and unthinned plots. However, in the thinned plots, the largest 494 stems per ha were on average 11%, 28%, and 58% greater, respectively, in height, dbh, and volume compared to similar dominant sprouts in unthinned plots. Logistic regression analysis was used to develop curves for the evaluation of potential gains from clump thinning. In this analysis, the average height of a stand at age 5 was used to estimate thinning gains at age 30.     

健康黑松幼苗中的电波传递

以健康黑松(Pinus thunbergii)幼苗为材料,用非伤害性刺激,如冷冻和伤害性刺激,如：烧伤、刺伤、化学伤害等引发了植物体内的波形的变化,研究表明,非伤害性刺激能在幼苗体内引起动作电波的传递,伤害性刺激除了能引起动作电波的传递外,还能引起较为复杂的变异电波的传递并对这种现象进行了讨论。图4参28。