红锥苗木繁育技术

红锥是华南地区重要的乡土阔叶珍贵用材和高效多用途树种,在我国华南地区发展前景广阔。从圃地选择、整地和作床、种子处理、苗期管理、扦插育苗、嫁接育苗等方面介绍了红锥的育苗技术。     

毛竹生境引入格氏栲对林分涵养水源功能的影响

我国南方现有毛竹纯林的生态功能十分脆弱，为探索毛竹林定向改造及生态林重建途径，恢复与建立竹阔复层混交林，在毛竹纯林中栽植格氏栲，研究林分涵养水源功能的变化。结果表明：毛竹适宜的保留密度为2 400~3 600株/hm²，格氏栲栽植密度为900株/hm²；栽植格氏栲10 a后，竹阔混交林的土壤密度显著下降，土壤孔隙度和持水量大幅增加，土壤中水稳性团聚体含量增加，土壤渗透性能与抗蚀强度大幅提升，林分涵养水源功能明显增强。研究结果可为我国南方生态功能区毛竹纯林改造提供借鉴。     

高山栲水提液对云南松种子发芽的化感效应

为了解混交树种高山栲对云南松的化感作用,用高山栲各器官水提液对云南松种子的发芽进行处理。结果表明,高山栲鲜叶、枝干、树皮、树根,枯落叶水提液对云南松种子的发芽和芽的生长均有一定的影响。所有样品的水提液均表现出在高浓度下对云南松种子发芽和芽的生长有明显抑制作用,随着水提液浓度减小,抑制作用减弱、消失甚至转变为促进作用的规律;其中枝干和鲜叶水提液对云南松种子发芽和芽的生长作用强度最大;发芽效果不同指标对高山栲各器官水提液作用的敏感性次序是:鲜重>根长>发芽率>胚轴长。说明在营造云南松和高山栲混交林时,高山栲比例适当减小将有利于云南松的天然更新和生长。     

常绿阔叶林迹地两种更新方式形成的群落生产力研究

通过对常绿阔叶林迹地两种更新方式所形成的不同群落生产力的比较研究，结果表明：采用人促天然更新形成的米储单优群落生产力与经济效益均高于杉木人工林，其中米储单优群落的林分总蓄积量比杉木林高１１．８７％，林分总生物量高２２．１０％；人促天然更新的投资利润率和财务内部收益率分别比营造杉木人工林高５．８４％和１１．０３％。     

不同海拔高度和造林密度对红锥人工林生长的影响

本文以广东省龙眼洞林场在1989年种植的红锥人工林为研究对象,对不同海拔高度和造林密度下红锥近20年生长量进行分析和统计,以期得出红锥人工林适宜的海拔高度和最佳造林密度。结果表明：不同海拔高度对红锥人工林生长量影响较小,在0-300 m的海拔高度内,红锥人工林的胸径、树高和蓄积量等差异不显著;不同密度对其生长有显著影响,综合分析得出该地区红锥的最佳造林密度为800株/ hm2。     

杉木格氏栲混交林试验研究

格氏栲与杉木人工混交林试验生长量情况调查与比较得出：格氏栲与杉木混交林比例为1：1比杉木纯林蓄积量高,而且对土壤改良有显著效果.杉木与格氏栲均有较强萌芽力,应及时除蘖,格氏栲应适当修枝.     

建阳武夷山区米槠群落特征的初步研究

Castanopsis carlesii forest is one of the main broadleaved forest types in Fujian Province. The study on thestructural features of its community showed that the community is dominated by Theaceae and Fagaceae families and thedominant tree are Castanopsis carlesii, Castanopsis fordii, Castanopsis fargesii and Schimu supereba. The community wasstable relatively, and lay in a vigorous growing period. Shannon-Wiener index was between 2.5 to 5.0. Shannon-Wienerevenness index was between 0.6 to 0.87. The overall association of all the pecies were observed to bane nonsignificant pos-itive association. The suggestious for its protection and exploitation were put forward in this paper.     

福建三明格氏栲林物种多度分布格局研究

Species abundance distribution was regarded as an important measuring method of species diversity study inCastanopsis kawakamii forest. The log-series model was used to calculate, inspect and draw to illustrate the species abun-dance of 7 main communities by investigating species amounts of community composition types in C. kawakamii forest,which including ( C. kawakamii + Schima superba + Litsea mollifolia, (2 C. kawakamii + Daphniphyllum oldhamii +Schima superba, 3 C . kawakamii + Quercus glandulifera + Ilex purpurea , (4 C . kawakamii pure forest, (5 Pinus massoni-ana+ Schima superba + Elaeocarpus decipiens , ⑥ C . kawakamii + Pinus massoniana + Symplocos stellaris , (7 Castanopsiseyrei + C. kawakamii + Schima superba. The results showed that species abundance of arbor layer, shrub layer, all woodyspecies of 7 main communities in C. kawakamii forest all obey a logarithmic series distribution.     

Concentrations and seasonal dynamics of dissolved organic carbon in forest floors of two plantations （Castanopsis kawakamii and Cunninghamia lanceolata） in subtropical China

The concentrations and seasonal dynamics of DOC in forest floors of monoculture plantations ofCastanopsis kawakamii and Chinese fir (Cunninghamia lanceolata) were assessed in Sanming, Fujian, China (26°11′30″N, 117°26′00″E). Forest floor samples were taken in January, April, July and October in 2002 and divided into undecomposed material (horizon Oi), partially decomposed organic material (horizon Oe), and fully decomposed organic material (horizon Oa). Upon collection, DOC concentrations of samples were analyzed by a High Temperature TOC. The results showed that the annual average DOC concentration of Chinese fir (1341.7 mg·kg⁻¹) in the forest floor was higher than that ofCastanopsis kawakamii (1178.9 mg·kg⁻¹). Difference in DOC concentrations was observed among three horizons of the forest floor. DOC concentration of forest floor in the two forests was the highest in horizon Oe. Seasonal trends of DOC concentrations in different horizons of forest floors were similar and the maximal value occurred in autumn (or winter). The concentration and temporal change of DOC in studied forests were probably related to the variation in moisture, temperature, biological activity and quantity of organic matter in the forest floor. Foundation item: This study was supported by the Teaching and Research Award program for MOE P.R.C. (TRAPOYT) Biography: ZHANG Jiang-shan (1946-), male, Researcher in Fujian Normal University, Fuzhou 350007, P.R. China. Responsible editor: Zhu Hong     

红锥采穗圃营建及其穗条的扦插育苗试验

红锥是我国极具推广和开发价值的南亚热带优良速生珍贵用材树种。为了获取红锥大量扦插繁殖用的穗条,营建其采穗圃,经大量的试验研究,探索到了较为完备的红锥采穗圃营建技术。通过对所采穗条开展的扦插育苗试验,探明了不同的穗条处理方式、不同扦插季节、不同扦插基质、不同生根药物和采穗母株对其穗条扦插生根的难易。致使红锥穗条的扦插生根率最高可达90%以上。