文献类型：期刊文献

中文题名：广东天井山成熟杉木人工林根系生物量的测定

英文题名：Determination of root system biomass of matured Cunninghamia lanceolata plantation in Tianjingshan Forest Farm, Guangdong province

作者：黄春华[1] 周光益[2] 赵厚本[2] 周志平[1] 邱治军[2]

第一作者：黄春华

机构：[1]广东省天井山林场;[2]中国林业科学研究院热带林业研究所

年份：2013

卷号：33

期号：9

起止页码：80-86

中文期刊名：中南林业科技大学学报

外文期刊名：Journal of Central South University of Forestry & Technology

收录：CSTPCD;;北大核心:【北大核心2011】；CSCD:【CSCD_E2013_2014】；

基金：中国科学院战略性先导科技专项(XDA05050205);南岭森林生态系统定位研究站

语种：中文

中文关键词：杉木人工林;成熟林;根系生物量;偏态分布;地下;地上比率;资源竞争效应

外文关键词：Cunninghamia lanceolata plantation; mature forest; root system biomass; skewed distribution; root/shoot rate; resources competition effect

分类号：S791.27

摘要：采用全挖法对广东天井山成熟杉木人工林中具不同优势度和胸径（D）的8株样木进行了根系生物量实测，以D、D2H参数建立了根系生物量模型，分析了该森林根系生物量在各森林层次、各直径级的分配规律等。结果表明：（1）与单一胸径为自变量相比，树高的引入并没有显著提高方程的精度：根系生物量建议首选三次方程来拟合，其次是二次方程和幂函数。（2）该森林总地下根系生物量平均为29．27t．hm^-2，其中乔木层根系（28．11t．hm^-2）占96．04％，灌木、草本层分别占0．38％和3．59％；乔木层根系生物量中，根头（WST）、粗根（WC）、大根（W1）、中根（WM）、小根（Ws）和细根（WF）分别占57．3％、15．8％、17．0％、4．76％、3．16％和1．97％，根径〉2cm的根生物量占乔木层总根量的90．1％。f3）与乔木层地上生物量一样，根系生物量按径级分布的峰值都出现在18～22cm径阶范围，都呈现偏态分布，说明大径级林木对成熟杉木林根系生物量贡献大。（4）随林木优势度的降低，起支撑树体作用的根系比例逐渐减少，用于养分及水分吸收、传输的小根和细根的比例明显增加；且单位枝叶重量需求的根量也随优势度降低而显著增加，这是中下层被压木在受到林冠伸展空间、光照、土壤养分竞争等胁迫时的一种适应机制，这一现象称之为“资源胁迫刺激林木多产根”，可以用资源竞争效应来解释。
The root system biomasses of 8 normal sample trees with different dominance and diameter at breast height （D） in matured Cunninghamia lanceolata plantation in Tianjingshan Forest Farm, Guangdong Province were measured by total root excavating methods. The root system biomass regression models were set up by using parameters of D and D2H, and also the root biomass allocation pattern in different forest layers and in various diameter classes were analyzed. The results indicate that： （1） Adding H factor as the second independent variable slightly improved the predictive power of the allometric equation compared to the equation only involving D; so, it was suggested that the cubic equation should be the first choice to estimate the root system biomass, then the quadratic and power equation next. （2） The total underground root biomass of the plantation was 29.27 t.hrn-2, and the biomasses in arbor, shrub, herb layer took up 96.04%, 0.38%, 3.59% respectively; and 57.3%, 15.8%, 17.0%, 4.76%, 1.97% of arbor biomass were distributed in root stump （WsT）, coarse root （Wc）, larger root （WE）, middle root （WM）, small root （Ws）, fine root （WF） respectively; the root biomasses for more than 2.0 cm root diameter occupied 90.1% of total root biomass. （3） The root biomasses of tree layer in different diameter class showed the skewed distribution as same as aboveground biomass, and the crest values appeared in the 18~22 cm diameter class, that inferred larger diameter trees had more contribution to root biomass of matured Chinese fir plantation. （4） As decreasing of tree dominance, the biomass proportion of the roots for supporting tree body decreased, and that of small and fine roots for absorbing and transferring water and nutrient increased significantly. And also, the required root amount for per unit weight of branch and leaf increased obviously as the decrease of tree dominance. The phenomenon is called ＂resource stress stimulates tree to produce more roots＂ , and is a suitable mechanism for non-dominant trees when they face increasing stress of canopy growth space, light and soil nutrient competition. The phenomenon can be explained by resource competition effect.