Journal of Guangxi Normal University(Natural Science Edition) ›› 2020, Vol. 38 ›› Issue (1): 149-156.doi: 10.16088/j.issn.1001-6600.2020.01.020

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Study on Root Biomass of Pinus massoniana Plantations in Subtropical China

SONG Zunrong1, QIN Jiashuang1, LI Mingjin2, MA Jiangming1,3*, ZHONG Fengyue2, YANG Zhangqi3,4, YAN Peidong3,4   

  1. 1.Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University),Ministry of Education, Guilin Guangxi 541006, China;
    2.Zhenlong State-owned Forest Farm, Hengxian Guangxi 530327,China;
    3. Guangxi Key Laboratory of Superior Timber Trees Resource Cultivation, Guangxi Forestry Research Institute,Nanning Guangxi 530002, China;
    4.Guangxi Institute of Forestry Science Timber Forest Research Institute, Masson PineEngineering Technology ResearchCenter of SFA (State Forestry Administration), Nanning Guangxi 530002, China
  • Received:2018-09-20 Online:2020-01-25 Published:2020-01-15

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Abstract: Focused on the biomass of root system in four different ages of Masson pine forests in Guangxi, this research was investigated in a way of space-for-time substitution. Furthermore, it provides a reference for exploring the material cycle and nutrient flow during the growth of Pinus massoniana plantation and the evaluation of the growth status of Pinus massoniana plantation. The results showed that: (1)Among the three soil layers of 0-60 cm, the roots are mostly concentrated in the soil layers of 0-40 cm, namely, young forest (88.6%), middle-aged forest (92.56%), mature forest (93.67%) and over-mature forest (86.24%). Among them, the root biomass is the most in the soil layer 0-20 cm deep, and increases the most between the mature forest (0.34 t/hm2) and the over-mature forest (1.08 t/hm2) in the two soil layers 20-60 cm deep. (2) The root distribution pattern of the four forest types is different in four diameter grades. In the young forest and the middle-aged forest, the proportion of fine roots (0-2 mm) and small roots (2-5 mm) are larger, and the sum of their proportions are 87.43% and 79.32%, respectively, while the larger the diameter grade, the smaller the proportion; In mature forest and over-mature forest, the biomass ratio of middle root(5-10 mm) to thick root (>10 mm) began to increase compared with that in young forest and middle age forest, the biomass of middle root increases the most between mature forest (0.75 t/hm2) and over-mature forest (1.94 t/hm2), and the biomass of thick root increases the most between middle age forest(0.32 t/hm2) and mature forest (2.72 t/hm2). Overall, the total biomass of root system increases gradually with the increase of forest age. Root biomass decreases gradually with the deepening of soil depth. By analysis of variance, the effect of soil depth (F=13.903, P<0.01) on root biomass is extremely significant, while the effect of forest age (F=1.530, P=0.226) on root biomass is not significant.

Key words: root biomass, distribution pattern, Pinus massoniana plantation, south subtropics of Guangxi

CLC Number: 

  • S718.3
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