思茅松人工林根系特征与生物量分配  

Root characteristics and biomass allocation for Pinus kesiya var. langbianensis plantation

作　　者：贾呈鑫卓[1,2] 李帅锋[1,2] 苏建荣[1,2] 童清 

机构地区：[1]中国林业科学研究院资源昆虫研究所,昆明650224 [2]国家林业局普洱森林生态系统定位研究站,昆明650224 [3]云南省普洱市林业科学研究所,云南普洱665000

出　　处：《生态学杂志》2017年第1期21-28,共8页Chinese Journal of Ecology

基　　金：林业公益性行业科研专项项目(201404211);云南省科技计划项目(2013RA004);中国林科院中央级公益性科研院所基本科研业务费专项资金资助项目(CAFYBB2014QA014)资助

摘　　要：通过研究不同径级思茅松人工林根系特征、地上部分各器官以及根系生物量分配特征,构建以胸径和树高为变量的思茅松人工林各器官生物量的异速生长方程,为思茅松人工林乔木层碳储量的准确测算提供科学依据。结果表明:思茅松的粗根(根径>2.0 cm)、大根(1.0~2.0 cm)、中根(0.5~1.0 cm)和小根(0.2~0.5 cm)的根长和比根长随径级增加而增大,细根(<0.2 cm)的比根长降低;中根、小根和细根在根生物量中所占的比例随径级增大先减小后增加,粗根和大根先增加后减小;同一径级中,细根的比根长远高于其他根系类型;思茅松各器官生物量分配大小比例为干>枝>根>叶>果,树干生物量均占全株生物量50%以上,各器官生物量随着径级的增大而增加,地上生物量和地下生物量之间呈显著正相关。思茅松单株地上部分生物量在2.23~324.95 kg,根生物量在0.52~41.80 kg,根颈、主根和侧根的生物量随径级增加而增加,根颈/主根、根颈/总根、侧根/主根与胸径和树高呈显著正相关,主根/总根与胸径和树高呈显著负相关;思茅松人工林各器官和总生物量异速生长模型的非线性回归与对数转换后的线性回归的AIC差值都大于2,误差为相乘型,选用线性模型更合适。各器官和总生物量线性模型的R_(adj)~2为0.661~0.992,除球果外,加入树高的模型能较好地拟合各器官与全株生物量。In this paper,the root characteristics,the biomass allocation patterns of aboveground organs and root in different diameter classes of Pinus kesiya var. langbianensis plantation were studied. Biomass equations for various organs of P. kesiya var. langbianensis plantation were established based on independent variables including DBH and tree height. We aimed at providing a scientific basis for accurate measurement for carbon storage of the P. kesiya var. langbianensis plantation’s arborous layer. The length and specific root length（ SRL） of coarse root,large root,medium root and small root increased but the SRL of fine root decreased with the increase of diameter class. The biomass proportion of medium root,small root and fine root decreased first and then increased with the increase of diameter class,while that of coarse root and large root increased first and then decreased. For the same diameter class,SRL of fine root was much higher than that of other roots. Biomass of various organ ranked as stem〉branch〉root〉needle〉cone,and the stem biomass accounted for 〉50% of the total biomass. Each organ biomass increased with the increase of diameter class,and aboveground biomass was significantly positively related with underground biomass. The individual aboveground biomass ranged from 2.23 to 324.95 kg and belowground biomass ranged from 0.52 to 41.80 kg. The biomass of root collar,taproot and lateral root increased with the increase of diameter class. Collar / taproot,collar / total-root and lateralroot / taproot ratios were significantly positively related with DBH and tree height,and taproot / total-root ratio had a significant negative correlation with DBH and tree height. AICNLR-AICLRvalues were larger than 2,showing that the linear equation was reasonable. The index of Radj2 was0.661-0.992. The equations including tree height could improve model fitting performance and predicting precision of the biomass of the whole tree and organs except for cone.

关 键 词：思茅松人工林 根系特征 生物量分配 异速生长方程 

分 类 号：S718.5[农业科学—林学]