Journal of Guangxi Normal University(Natural Science Edition) ›› 2025, Vol. 43 ›› Issue (1): 150-160.doi: 10.16088/j.issn.1001-6600.2024062801

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Dynamic Effects of Pinus massoniana Replanted with Broad-leaved Trees of Schima superb on Soil Microbial Biomass Carbon and Nitrogen

PENG Suqin1,2, LIU Yulin3, MAO Rong4, LIU Yuqiu4*, FAN Yixuan5, ZHOU Yushan1,2, YANG Qi1,2   

  1. 1. School of Geography and Environmental Engineering, Gannan Normal University, Ganzhou Jiangxi 341000, China;
    2. Engineering Research Center of Bamboo-base New Materials and Material Transformation in Jiangxi, Gannan Normal University, Ganzhou Jiangxi 341000, China;
    3. College of Forestry, Jiangxi Environmental Engineering Vocational College, Ganzhou Jiangxi 341002, China;
    4. College of Forestry, Jiangxi Agricultural University, Nanchang Jiangxi 330045, China;
    5. College of Resources and Environment, Hubei University, Wuhan Hubei 430062, China
  • Received:2024-06-28 Revised:2024-07-29 Online:2025-01-05 Published:2025-02-07

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Abstract: The study of soil microbial biomass carbon and nitrogen is of great significance for the study of the forest soil nutrient status and carbon and nitrogen cycle, in order to find out the distribution characteristics and seasonal and soil layer change rules of forest soil microbial biomass carbon and nitrogen under different stand structure in degraded red soil region. The contents of soil microbial biomass carbon and nitrogen were taken as the measurement indexes,the soil of the Pinus massoniana pure plantation and Schima superb pure plantation planted in 1991 were taken as the control, and the effects of the P. massoniana replanted with broad-leaved treest of S. superb on soil microbial biomass carbon and nitrogen contents in different soil layers and their seasonal laws were analyzed. The results showed as follows: (1) Soil MBC content of S. superb plantation and the mixed plantation of P. massoniana and S. superb plantation was significantly higher than that of P. massoniana plantation (P<0.05), the content of soil MBC was significantly increased after the P. massoniana forest was thinned and replanted with broad-leaved trees of S. superb(P<0.05) and the soil MBC of all plantations decreased with the depth of soil layer. Seasons had a significant effect on soil MBC (P<0.05), and the soil MBC content of the three plantations was almost the highest in spring and the lowest in winter; (2) Soil MBN content of S. superb plantation and the mixed plantation of P. massoniana and S. superb plantation was significantly higher than that of P. massoniana plantation (P<0.05), the content of soil MBN was significantly increased after the P. massoniana forest was thinned and replanted with broad-leaved trees of S. superb (P<0.05). and the soil MBN of all plantations decreased with the depth of soil layer. Seasons had a significant effect on soil MBN, and the soil MBN content of the three plantations was almost the highest in spring and the lowest in summer (P<0.05); (3)There was significant positive correlation between soil MBC and soil MBN (P<0.01), the soil MBN was significantly positively correlated with litter N (P<0.05), and negatively correlated with litter C and litter C/N (P<0.01). The results showed that the content of soil MBC and MBN was significantly increased after the P. Massoniana plantation was thinned and replanted with broad-leaved trees of S. superb (P<0.05), which was more conducive to the improvement of soil fertility.

Key words: degraded red soil, Pinus massoniana, stand structure, soil microbial biomass, C/N ratio, seasonal variation

CLC Number:  S714.3
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