混交林特性对马尾松混交林土壤碳储量的影响,Science of the Total Environment

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混交林特性对马尾松混交林土壤碳储量的影响
Science of the Total Environment ( IF 8.2 ) Pub Date : 2023-10-17 , DOI: 10.1016/j.scitotenv.2023.167889
Fenghua Tang ₁ , Yunchao Zhou ₁ , Yunxing Bai ₁

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生产力的提高通常会促进土壤有机碳（SOC）储量的积累。混交林的生产力主要受植物物种丰富度（PSR）、混交林年龄（MFA）和混交物种比例（MSP）的影响。然而，PSR、MFA 和 MSP 对混交林土壤剖面上 SOC 储量的影响仍有待确定。我们使用来自 110 份出版物的 1010 配对混合和纯股票中的 SOC 股票的配对观察进行了荟萃分析。研究结果表明，SOC 储量高度依赖于 MFA，并随着各土层 MFA 的增加而增加，而不是 PSR 的预期影响。MFA对表土、中土和下土SOC储量的增加分别贡献了48.97%、83.20%和38.41%。此外，当 40 % < MSP ≤ 60 % 时，MSP 还显着影响表土和中土 SOC 储量的增加。未来 60 年，混合林中 PSR 和 MSP 的增加将限制地下 SOC 的积累。和阔叶树种（特别是和）之间的混合显着提高了土壤剖面上的 SOC 储量。沿土壤剖面的 SOC 储量随着优势混合树种丰富度（例如阔叶树、落叶阔叶树、丛枝菌根以及针叶树和阔叶树的总和）的增加而减少。结合较低的 PSR（例如，2 ≤ ≤ 10）和主要混合树种丰富度（例如，= 2）实践可能是增加 SOC 储量的优化选择。总体而言，基于优化生产力、增强碳储存、减缓气候变化、促进生物多样性保护等预期目标，我们强调将MFA、MSP、树种识别和底土纳入森林管理的重要性。

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The effect of mixed forest identity on soil carbon stocks in Pinus massoniana mixed forests

Increased productivity generally promotes the accumulation of soil organic carbon (SOC) stocks. The productivity of mixed forests is mainly influenced by plant species richness (PSR), mixed forest age (MFA), and mixed species proportion (MSP). However, the influence of PSR, MFA, and MSP on SOC stocks along the soil profiles in mixed forests remains to be determined. We conducted a meta-analysis employing paired observations of SOC stocks from 1010 paired mixed and pure stands of from 110 publications. The findings revealed that SOC stocks were highly dependent on MFA and increased with increasing MFA in various soil layers, rather than the expected influence of PSR. MFA contributed 48.97 %, 83.20 %, and 38.41 % to the increased SOC stocks in the topsoil, midsoil, and subsoil, respectively. Furthermore, MSP also significantly affected the increase in SOC stock in the topsoil and midsoil when 40 % < MSP ≤ 60 %. Over the next 60 years, subsoil SOC accumulation will be limited by increased PSR and MSP in mixed forests. Mixing between and broadleaf tree species (especially and ) significantly enhanced SOC stocks along the soil profiles. SOC stocks along the soil profiles decreased with increasing dominant mixed tree species richness (e.g., broadleaf, deciduous broadleaf, arbuscular mycorrhizal, and the sum of conifer and broadleaf trees). Incorporating lower PSR (e.g., 2 ≤ ≤ 10) and dominant mixed tree species richness (e.g., = 2) practices may be optimization options for increasing SOC stocks. Overall, based on the expected goals, including optimizing productivity, enhancing carbon storage, mitigating climate change, and promoting biodiversity conservation, we emphasize the importance of incorporating MFA, MSP, tree species identity, and subsoil into forest management.

更新日期：2023-10-17

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