东北人工林树种组成对土壤团聚体稳定性和有机碳库的影响

IF 3.1 2区农林科学 Q2 SOIL SCIENCE

Geoderma Regional Pub Date : 2024-12-01 DOI:10.1016/j.geodrs.2024.e00899

Changzhun Li, Qingcheng Wang, Huirong Wu, Yong Zhang, Shuangjiao Ma, Liqing Xu

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Tree species composition in plantation stands significantly affects SAS and SOC pools. In conclusion, the positive effect of mixed coniferous and broad-leaved forests on SAS and SOC pools is also contingent upon the tree species identity. 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引用次数: 0

摘要

森林树种组成影响土壤团聚体稳定性（SAS）和活性有机碳（LOC）组分，从而影响土壤有机碳（SOC）的固存。尽管人们普遍认为混交林能提高有机碳储量，但有证据表明，某些单一栽培可能比混交林表现更好。因此，关于树种混合通过SAS和LOC对土壤有机碳的具体影响的信息仍然有限。本研究旨在探讨树种组成对49年单一栽培（落叶松（Lg）、红松（Pk））和针叶阔叶混交林（落叶松-水曲柳（LF）、红松-乌苏杨（PP））林分中土壤有机碳（SAS）和LOC)的影响及其对土壤有机碳固存的影响。我们测量了SAS指数(包括平均重量直径（MWD）、几何平均直径（GMD）和>；生长季节（6、8、10月）0 ~ 40 cm土层0.25 mm水稳团聚体比例（WSA）、SOC储量和LOC组分（易氧化有机碳（EOC）、微生物生物量碳（MBC）和溶解有机碳（DOC））。结果表明，树种组成对土壤有机碳和SAS组分有显著影响，其中Pk和PP林0 ~ 20 cm土层的SAS含量最高(p <；0.05)(6月：MWD Pk: 0.98, GMD Pk: 1.88, WSA Pk: 1.79, MWD PP: 0.98, GMD PP: 1.90, WSA PP: 1.81；8月：MWD Pk: 0.99, GMD Pk: 1.85, WSA Pk: 1.77, MWD PP: 0.99, GMD PP: 1.89, WSA PP: 1.81；10月：MWD Pk: 0.98, GMD Pk: 1.86, WSA Pk: 1.76, MWD PP: 0.97, GMD PP: 1.83, WSA PP: 1.73)和LF林分最高的SOC成分(p <；0.05) (0 ~ 20 cm土层：6月：有机碳：110.23 g/kg，有机碳：92.81 g/kg, MBC: 1418.39 mg/kg, DOC: 1090.01 mg/kg；8月：SOC: 108.46 g/kg, EOC: 79.57 g/kg, MBC: 1369.91 mg/kg, DOC: 1316.11 mg/kg；十月：SOC: 109.78 g/kg, EOC: 44.37 g/kg, MBC: 1782.6 mg/kg, DOC: 671.05 mg/kg)。相关分析显示，SOC与LOC组分之间存在显著的相关关系(p <；0.05, r EOC = 0.43, r MBC = 0.46, r DOC = 0.17)，但与SAS无关(p >；0.05, r MWD =−0.07,r GMD =−0.07)。人工林树种组成对土壤有机碳和SAS库有显著影响。综上所述，针叶林与阔叶林混交林对土壤有机碳和SAS库的积极影响也取决于树种的特性。结果表明，与单纯增加物种丰富度相比，有针对性的树种选择能更好地增加人工林的SAS和SOC库。

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Effects of tree species composition in plantation forest on soil aggregate stability and organic carbon pools in northeastern China

Forest tree species composition influences soil aggregate stability (SAS) and labile organic carbon (LOC) components, which may affect soil organic carbon (SOC) sequestration. Despite the general belief that mixed forests enhance SOC storage, evidence suggests that certain monocultures may outperform mixed forests. Therefore, information on the specific impact of tree species mixing on SOC through SAS and LOC remains limited. This study aimed to investigate the effects of tree species composition on SAS and LOC in 49-year-old monoculture (Larix gmelinii (Lg), Pinus koraiensis (Pk)) and mixed conifer-broadleaf (Larix gmelinii - Fraxinus mandshurica (LF), and Pinus koraiensis - Populus ussuriensis (PP)) stands, and its impact on SOC sequestration. We measured SAS indices (including mean weight diameter (MWD), geometric mean diameter (GMD), and > 0.25 mm water stable aggregate proportion (WSA)), SOC storage, and LOC components (easily oxidized organic carbon (EOC), microbial biomass carbon (MBC), and dissolved organic carbon (DOC)) in 0–40 cm soil horizons during the growing season (June, August, and October). Our results showed that tree species composition significantly influenced SAS and SOC components, with the highest SAS found in the 0–20 cm soil horizon in Pk and PP forests (p < 0.05) (Jun.: MWD _Pk: 0.98, GMD _Pk: 1.88, WSA _Pk: 1.79, MWD _PP: 0.98, GMD _PP: 1.90, WSA _PP: 1.81; Aug.: MWD _Pk: 0.99, GMD _Pk: 1.85, WSA _Pk: 1.77, MWD _PP: 0.99, GMD _PP: 1.89, WSA _PP: 1.81; Oct.: MWD _Pk: 0.98, GMD _Pk: 1.86, WSA _Pk: 1.76, MWD _PP: 0.97, GMD _PP: 1.83, WSA _PP: 1.73) and the highest SOC components in the LF stand (p < 0.05) (soil horizon 0–20 cm: Jun.: SOC: 110.23 g/kg, EOC: 92.81 g/kg, MBC: 1418.39 mg/kg, DOC: 1090.01 mg/kg; Aug.: SOC: 108.46 g/kg, EOC: 79.57 g/kg, MBC: 1369.91 mg/kg, DOC: 1316.11 mg/kg; Oct.: SOC: 109.78 g/kg, EOC: 44.37 g/kg, MBC: 1782.6 mg/kg, DOC: 671.05 mg/kg). Correlation analysis revealed significant relationships between SOC and LOC components (p < 0.05, r _EOC = 0.43, r _MBC = 0.46, r _DOC = 0.17) but not associated with SAS (p > 0.05, r _MWD = −0.07, r _GMD = −0.07). Tree species composition in plantation stands significantly affects SAS and SOC pools. In conclusion, the positive effect of mixed coniferous and broad-leaved forests on SAS and SOC pools is also contingent upon the tree species identity. The results suggest that targeted selection of tree species could better enhance SAS and SOC pools in plantation than a mere increase in species richness.

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来源期刊

Geoderma Regional Agricultural and Biological Sciences-Soil Science

CiteScore

6.10

自引率

7.30%

发文量

122

审稿时长

76 days

期刊介绍： Global issues require studies and solutions on national and regional levels. Geoderma Regional focuses on studies that increase understanding and advance our scientific knowledge of soils in all regions of the world. The journal embraces every aspect of soil science and welcomes reviews of regional progress.