Influence of density and site on fine root characteristics of <i>Pinus tabuliformis</i> plantations in loess area of western Shanxi Province, northern China

Wei Zhaoyang; Zhang Jianjun; Lai Zongrui; Hu Yawei; Zhao Jiongchang; Tang Peng; Wang Siqi

doi:10.12171/j.1000-1522.20230282

Journal of Beijing Forestry University > 2024 > 46(10): 22-32. > DOI: 10.12171/j.1000-1522.20230282

Wei Zhaoyang, Zhang Jianjun, Lai Zongrui, Hu Yawei, Zhao Jiongchang, Tang Peng, Wang Siqi. Influence of density and site on fine root characteristics of Pinus tabuliformis plantations in loess area of western Shanxi Province, northern China[J]. Journal of Beijing Forestry University, 2024, 46(10): 22-32. DOI: 10.12171/j.1000-1522.20230282

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Influence of density and site on fine root characteristics of Pinus tabuliformis plantations in loess area of western Shanxi Province, northern China

1.
School of Soil and Water Conservation, Jixian National Forest Ecosystem Observation and Research Station (CNERN), Beijing Forestry University, Beijing 100083, China
2.
State Forestry Administration Key Laboratory of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
3.
Engineering Research Center of Forestry Ecological Engineering of Ministry of Education, Beijing Forestry University, Beijing 100083, China

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Received Date: October 21, 2023
Revised Date: September 28, 2024
Available Online: October 10, 2024

Graphical Abstract

Abstract

Abstract

Objective
This paper explores the vertical distribution of fine root biomass (≤ 2 mm) and fine root morphology of P. tabuliformis plantations under different stand densities, slopes and aspects, so as to provide a basis for vegetation management and ecological construction evaluation in the loess region of western Shanxi Province of northern China.
Method
We investigated the vertical distribution and influencing factors of fine root characteristics, including fine root biomass density, length density, tissue density, specific root length and specific surface area in 0−100 cm soil layer of P. tabuliformis under five stand densities (M1(< 2 000 tree/ha), M2(2 000−3 000 tree/ha), M3(3 000−4 000 tree/ha), M4(4 000−5 000 tree/ha), M5(> 5 000 tree/ha)), three slopes (≤ 20°, 20°−30°, 30°−40°) and two aspects (shady slope and sunny slope).
Result
(1) The fine root biomass density in 0−100 cm soil layer exhibited a unimodal pattern with the increase in stand density, reaching its peak at 606.19 g/m³ with M4 density. The slope and aspect showed no significant impact on fine root biomass density. The density of fine root biomass decreased significantly with the increase of soil depth (P < 0.05), mainly concentrated in 0−20 cm soil layer, accounting for more than 38%. (2) With the increase of stand density, the fine root length density of 0−100 cm soil layer showed a unimodal pattern (the maximum value with 3 639.73 m/ m² at M4 density ), and the specific root length and specific surface area showed a trend of decreasing first and then increasing (the minimum values with 601 cm/g and 101.09 cm²/g, respectively). While slope and aspect had no significant effects on the morphology and vertical distribution of fine roots. In the vertical direction, the ratio of fine root length density in 0−40 cm soil layer of each stand density was more than 60%. The specific root length and specific surface area of the 0-20 cm soil layer initially decreased and then increased as stand density increased(P<0.05). (3) Correlation analysis showed that stand density and soil depth significantly influenced fine root biomass density and morphology. Fine root biomass density and root length density were significantly positively correlated with stand density, soil total carbon, total nitrogen and organic carbon, significantly negatively correlated with soil depth and C∶N. Specific root length and specific surface area were significantly negatively correlated with stand density and soil organic carbon, and significantly positively correlated with soil depth (P < 0.05).
Conclusion
Stand density is a key regulatory factor for fine root characteristics of P. tabuliformis plantations. Stand management measures can be used to adjust stand density and fine root survival strategies, so as to improve the adaptability of P. tabuliformis plantations to cope with environmental stress, and provide theoretical support for sustainable management of artificial forest in semi-arid regions.

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References

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Influence of density and site on fine root characteristics of Pinus tabuliformis plantations in loess area of western Shanxi Province, northern China

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