Canopy recruitment in the beech (<Emphasis Type="Italic">Fagus engleriana</Emphasis>) forest of Mt. Shennongjia,Central China

A dendrochronological technique was used to investigate canopy recruitment of beech (Fagus engleriana Seem.) trees in western Hubei Province of Central China by identifying growth releases through gap formation. The results indicated that 83% and 17% of the canopy trees regenerate in gaps and the understory, respectively. Radial growth analyses demonstrated that there are three modes for beech regeneration and canopy recruitment: (1) gap origin without suppression; (2) gap origin with period(s) of suppression; and (3) understory origin. Multiple periods of release and suppression imply that beech regeneration and canopy recruitment are very sensitive to gap formation.     

我国木材加工机械发展展望

根据木工机械制造业状况,从我国木工机械行业发展趋势、经营模式、走向世界的途径等方面进行分析,探讨重塑木工机械产品品牌对于促进我国成为木工机械行业全球车间的意义.     

Relationships between larch growth and forest site factors

Dahurian larch (Larix gmelinii Rupr.) Rupr is one of the dominant species in both natural and man-made forests in northeast China. Effects of site factors, including topography, soil properties and nutrient elements (P, Ca, K, Mg, Mn, Zn, Cu, Ag, Co and Ni) on the growth of larch were analyzed in detail, qualitatively and quantitatively. The ordination technique was used to group the site factors and to classify sites for larch. Analysis indicated that height growth, diameter (DBH) and volume of the larch varied among site types and this will be of theoretical and practical significance in developing larch plantations.     

中国历史时期的森林文化及其发展

详述了森林文化的概念及内涵，系统总结了森林文化在不同历史时期的特征及相应历史背景。     

林区护路林建设与生态功能相结合的探索

对林区护路林建设提出了以景观和生态效益相结合的几点建议。     

杉木的受害允许水平及粗鞘双条杉天牛防治策略研究

本文在９年生人工纯林中，采用固定标准地、固定标准株连续３年对树高、胸径实测的方法，计算并比较阌 害与末受害木材积及单位面积材积的 失。     

A mangrove stand under sewage pollution stress: Red Sea

A mangrove stand of Avicennia marina located at the South Corniche of Jeddah city receives about 100 000 m³ of sewage per day. The sewage has high values of BOD, COD, nutrient concentrations, heavy metals and faecal coliform counts.The mangrove stand is very small and occupies an area of about 0.45 km². The trees are stunted with low pneumatophore density. The pneumatophore distribution is restricted to the area of substrate underneath the plant crown covers and they do not look healthy. A high proportion of them was observed to be dead and/or aberrant. These abnormal induced features were attributed to the sewage discharge in the area. The death of pneumatophores decreases the aeration area which apparently affects the respiration rate of the root system, nutrient uptake and plant growth, consequently leading to a retarded growth of the mangroves.     

中国大规模造林减少大气碳积累的潜力及其成本效益分析

在对中国森林实行永续轮伐的假定下，计算了通过大规模造林来减少大气中ＣＯ２积累的潜力，并进行相应的成本－效益分析。首先把中国分成５个区，在每个区中选择４种造林或森林经营的方式，总计２０种造林或森林经营的方式，根据现有可用于造林的土地面积的资料，对这些造成林或森林经营的方式进行计算。     

Determinants of equity-based entry mode choice in the forest sector: the case of China

The focus of foreign direct investment (FDI) in the global forest sector has shifted from developed to developing economies (currently accounting 73% of total) during the past two decades. China has been the main global driver with its annual FDI soaring from USD 130 million in 2002 to USD 550 million in 2010. In light of international economic and business theories, choice of foreign entry mode is considered the most critical issue in corporate expansion strategy, which, however, has not been empirically studied in the forest sector. To fill this gap, our paper focuses on modeling two equity-based entry mode choices (i.e. wholly owned subsidiary or joint ventures) of foreign investment projects in China based on data from 109 activities of the Top 100 forest, paper, and packaging industry companies. By using logistic modeling, the main determinants of corporate entry mode choice are found to be cultural and geographical distance between the corporate home country and China, duration of corporate presence in China, and spatial concentration of local-level forest industry. Instead, investment project size and local resource availability are found to have no significant impact on corporate entry mode choice in China.     

辽西地区主要造林树种抗旱性的研究

辽西地区属于半干旱季风气候区,年平均温度为7.1—8.2℃,年降水量为400—600mm,年蒸发量为1600mm,为降水量的3—4倍。干燥是该区总的气候特点。该区的植物群落主要为旱生的森林灌丛或草本植物群落,针叶树建群种为油松,阔叶树为蒙古栎,元宝槭,黄榆;灌木主要为荆条和酸枣。土壤是在各种岩石风化物残积母质上,以及黄土、红土母质上发育的淋溶褐土和褐色性土,土壤干旱瘠薄。水分是这一地区限制造林树种成活及生长的主要因子,本文试图通过对树种抗旱性的测定和分析,确定树种的抗旱能力,从而为辽西地区的造林提供树种选择的依据。