南亚热带马尾松人工林地上生物量模型构建及分配特征

doi:10.16088/j.issn.1001-6600.2020091606

Abstract

Abstract: In order to study the biomass model construction and distribution characteristics of different layers and organs (by leaf, branch, trunk and above-ground) of Pinus massoniana plantations in the near natural recovery process. Young stand, middle-aged stand, mature stand and over mature stand of P. massoniana plantations in Zhenlong forest farm of Hengxian county in southern subtropical area of Guangxi were selected as the research subjects. The results showed that: 1) The trunk and above-ground biomass estimation results were better, followed by leaves and branches. Overall, Model Ⅱ (W=a×D^b×H^c) had higher goodness of fit and smaller standard error, and the accuracy of model checking was higher, which could be used as the optimal model for biomass model fitting of different organs in shrub layer at different restoration stages; 2) With the near natural recovery, the order of the branch and trunk biomass of the woody community of P. massoniana plantations and the above-ground biomass of the community was overripe forest > mature forest > middle-aged forest > young forest, and the order of leaf biomass was middle-aged forest > overripe forest > mature forest > young forest. The biomass of each organ in the same community had significant difference among different ages of the same community (P < 0.05). The leaf biomass of woody communities of different forest ages were (2.65±0.01)~(7.77±0.35) t/hm², the branch biomass were (4.24±0.00)~(24.49±0.11) t/hm², the trunk biomass were (24.32±0.01)~(236.51±1.22) t/hm², and the above-ground biomass were (42.73±0.67)~(268.03±1.25) t/hm², in which the trunk was dominant. Within each forest age in P. massoniana plantations, the order of the above-ground biomass of each layer was arbor layer > shrub layer > herb layer, and the arbor layer was the main body of the above-ground biomass of the P. massoniana populations; 3) With the progress of near natural restoration, the order of above-ground biomass of P. massoniana populations were as follows: overripe forest > mature forest > middle-aged forest > young forest, and the proportion in the community increased first and then decreased. The proportion of leaf, branch and trunk biomass of P. massoniana populations in different restoration stages showed a downward trend. The results provide a scientific basis for the dynamic change researches of community structure of P. massoniana plantations in the near natural recovery process and are helpful to improve the stand productivity and carbon sink capacity.

Key words: biomass, estimation model, different stand ages, Pinus massoniana plantations

CLC Number:

S718.5

LI Yufeng, QIN Jiashuang, MA Jiangming, YANG Zhangqi, LI Mingjin, LU Shaohao, SONG Zunrong. Establishment of Above-ground Biomass Model and Distribution Characteristics of Pinus massoniana Plantations in Southern Subtropical[J].Journal of Guangxi Normal University(Natural Science Edition), 2021, 39(4): 170-180.

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Establishment of Above-ground Biomass Model and Distribution Characteristics of Pinus massoniana Plantations in Southern Subtropical

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