杉木混农模式综合评价方法的研究

The principles and steps of osculating value methods were introduced and the feasibleness and superiority weretestified by two examples in this paper. Furthermore, the benefits of economic, ecological, growth of Cunninghamia lanceola-ta and social of six different interplanting patterns Cunninghamia lanceolata-Lit sea cubeba, Cunninghamia lanceolata-Litsea cuba - soybean, Cunninghamia lanceolata- Litsea cuba- tobacco, Cunninghamia lanceolata- Aleurites fordii ,Cunninghamia lanceolata-Aleurites fordii-Mesona chinensis and pure Cunninghamia lanceolata were comprehensivelyevaluated by the methods of osculating value. The results showed that the Cunninghamia lanceolata-Aleuritesfordii-Mes-ona chinensis had the best comprehensive benefits and the Cunninghamia lanceolata-Li tsea cubeba was the second in thesix different interplanting patterns. The osculating value methods was a good mult- objective comprehensive methods whichnot only simple and convenient, but also effective and practical, and it worthy being further popularized and applied in theresearch field of forestry.     

杉木人工林降位间伐的综合经营效果分析

对杉木人工林降位间伐的综合经营效果进行分析,结果表明:在不增加森林资源消耗的情况下,降位间伐可增加出材率,增加材积为2.3547 m3·hm-2;有较好的经济效益,扣除投入成本,实际可增益1177元·hm-2;降位间伐与传统间伐一样能促进保留木的生长,有利于培育中、大径材。降位间伐与不间伐比,保留木平均胸径生长量增加51.0%,差异达显著水平,平均树高生长量增加15.5%,有差异,但未达显著水平。此外,降位间伐还能抑制伐桩萌芽,促进伐桩腐烂。因此,降位间伐在杉木人工林间伐时可大力推广应用。     

杉木混交林水源涵养和土壤性质研究

对南亚热带杉木混交林的水源涵养和土壤肥力进行了研究。结果表明 ,不同杉木混交林的水源涵养、土壤结构体、孔隙状况、水分状况和土壤化学性质均有明显差别。不同类型的混交林的持水能力不同 ,以杉木 -米老排混交林的最大 ,杉木 -火力楠与杉木 -马尾松的持水量很接近 ,杉木 -巨尾桉混交林的最小 ,其中杉木 -米老排的林分持水量达杉木 -巨尾桉的 2 2倍 ,杉木 -火力楠也达到杉木 -巨尾桉的 2倍 ,主要是由于杉木 -巨尾桉混交林的土壤的持水能力较小造成的。杉木 -巨尾桉混交林的土壤容重最大 ,土壤孔隙度最小 ,而其它 3种类型的差异不明显。土壤有机质含量及养分含量以杉木 -米老排混交林的最大 ,其它 3种类型则差异不大。这说明针阔混交具有较强的培肥土壤和水源涵养作用 ,对防止杉木多代连栽造成的地力衰退具有重要意义。     

VARIATION PATTERN OF WOOD PROPERTIES OF NATURALCUNNINGHAMIA LANCEOLATA

m0DUCYIONCunninghaniahaceolataisoneofmalnusedwoodspeciesinSouthernChina.ItPOs-sessesthecharactenshcsofhighadaPabilityandwideuhlity.WoodscienhstshavedonemorereaearchingworkonthegrOwingcharac-tenshcsandwoodPhysicalPropeniesofPlantedCunninghamiaboceolata,butlessonthewoodPropeniesvanahonpatternofnatUralCunninghtzmiahaceolata.ThewoodpropeniesandtheircorrelahonofCunn~oriahaceolatainnatUralforestwerestudiedinordertoProviderelevamtech-mqueparametersofitsPeffochonanduhliza-tion.nsThunSAunare…     

福建杉木人工林生长模型的研究

利用福建省杉木产区的材料 ,根据相对生长理论 ,选用Richards一般化的Bertalanffy模型为福建省杉木人工林生长的基本模型 ,并将地位指数和密度指数引入该模型 ,形成以地位指数、密度和年龄为自变量的多形生长模型。分析结果表明 ,该多形生长模型具有较高的精度 ,对指导闽西北杉木营林生产提供了有效的依据和信息 ,对杉木速生丰产林的进一步深入研究起到了积极的作用     

豫南山区杉木更新模式研究

豫南山区杉木林采伐后,及时栽种柳杉、水杉、马尾松有利于杉木林的自然更新。采用栽针萌杉更新模式可节约营林投资近 1 /3,高生长量可提高 0. 7~2. 4倍。     

Characteristics of carbon and nitrogen of soil microbial biomass and their relationships with soil nutrients in Cunninghamia lanceolata plantations

The soil microbial biomass and nutrient status under the native broadleaved forest and Cunninghamia lanceolata plantations at the Huitong National Research Station of Forest Ecosystem (in Hunan Province, midland of China) were examined in this study. The results showed that after the native broadleaved forest was replaced by mono-cultured C. lanceolata or C. lanceolata, soil microbial biomass and nutrient pool decreased significantly. In the 0–10 cm soil layer, the concentrations of soil microbial carbon and nitrogen in the broadleaved forest were 800.5 and 84.5 mg/kg, respectively. These were 1.90 and 1.03 times as much as those in the first rotation of the C. lanceolata plantation, and 2.16 and 1.27 times as much as those in the second rotation of the plantation, respectively. While in the 10–20 cm soil layer, the microbial carbon and nitrogen in the broadleaved forest were 475.4 and 63.3 mg/kg, respectively. These were 1.86 and 1.60 times as much as those in the first rotation, and 2.11 and 1.76 times as much as those in the second rotation, respectively. Soil nutrient pools, such as total nitrogen, total potassium, NH₄ ⁺-N, and available potassium, also declined after the C. lanceolata plantation replaced the native broadleaved forest, or Chinese fir was planted continuously. Less litter and slower decay rate in pure Chinese fir plantation were the crucial factors leading to the decrease of soil microbial biomass and nutrient pool in this area. Human disturbance, especially slash-burning and site preparation, was another factor leading to the decrease. There were significant positive correlations between soil microbial carbon and nitrogen and soil nutrients. To improve soil quality and maintain sustainable productivity, some measures, including planting mixed conifer with hardwood, preserving residues after harvest, and adopting scientific site preparation, should be taken. Translated from Chinese Journal of Applied Ecology, 2006, 17(12): 2,292–2,296 [译自: 应用生态学报]     

杉木不同优良品种早期生长对比试验

通过对2年生杉木不同优良品种对比试验林连续2 a的调查分析,结果表明,试验林1年生时的成活率和2年生时的保存率分别为94.38%和93.67%,优良品种适应性强且品种间差异极显著;试验林生长良好,1年生时平均树高为0.78m,2年生时达到1.98 m,当年平均抽高达到1.20 m,不同优良品种在树高性状上差异极显著;杉木优良品种适应性和早期速生性具有一致性。除了2号无性系和3号无性系表现较差外,其他杉木优良品种均表现良好。     

杉木壮苗集约培育技术研究初报

杉木是我国主要的速生丰产用材树种。培育杉木壮苗是营造优质杉木林的基础。试验证明：集约培育技术与传统育苗方法相比,不仅苗木各项技术指标超过GB6000—1999规定的Ⅰ级标准,而且每667m^2年产合格苗量稳定在14～16万株,苗木单株成本下降28．8％以上,经济效益显著提高。     

杉木与拟赤杨混交林的效益

杉木与拟赤杨混交类型应选择在缓坡，低洼，有季节性积水的地块造林，采用１：１行间混交方式，这样可以形成相对稳定的复层林相，经济效益显著；但在大多数山坡地块上，到中龄林时形成了同层林，拟赤杨有被淘汰的趋势，而杉木长势良好，高径生长量比纯林杉木显著。