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| 岩溶石漠化区营造豆科树种纯林及混交林对土壤活性有机碳组分及碳库管理指数的影响 |
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郑家琪1, 陈静文2, 周晓果2, 温远光2, 陈金磊2, 孙冬婧2, 周雪梦2, 邓少虹2, 许峻模2, 陈秋海2, 黄勇杰2, 王磊1
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| (1.广西大学林学院;2.广西科学院生态环境研究所) |
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| 摘要: |
| 岩溶区石漠化植被修复对土壤碳库的调控具有重要生态意义。本研究以在广西马山县营造的三种人工林[降香黄檀 (Dalbergia odorifera) 纯林、顶果木(Acrocarpus fraxinifolius)纯林、顶果木 × 降香黄檀混交林]为对象，以造林时保留的玉米地为对照，比较分析0-30 cm土层土壤活性有机碳组分[易氧化碳（EOC）、可溶性碳（DOC）、微生物生物量碳（MBC）]、碳库管理指数（CPMI）及氮磷养分关联性，探明豆科树种纯林及混交林对土壤活性有机碳组分及碳库管理指数的影响。结果表明：与玉米地（对照）相比，3种林分均显著提升表层（0-10 cm）土壤有机碳（SOC）及活性碳组分含量，其中混交林的DOC（79.29±9.87 mg·kg-1）和MBC（501.66±25.66 mg·kg-1）含量最高；降香黄檀纯林和混交林可显著增加深层土壤（10-30 cm）SOC含量。表层土壤CPMI表现为顶果木纯林＞混交林＞降香黄檀纯林＞对照，仅混交林显著提升深层土壤CPMI。相关分析表明，CPMI与土壤全氮、碱解氮、有效磷含量呈极显著正相关，可作为石漠化治理成效的评价指标。研究表明，豆科树种混交林通过增加碳输入和促进微生物活性，更有效地改善了土壤碳库质量，建议岩溶石漠化地区实施以混交林为主、纯林为辅的修复模式，以促进土壤碳封存和肥力提升。 |
| 关键词: 石漠化 植被修复 豆科树种 土壤活性有机碳 碳库管理指数 |
| DOI： |
| 投稿时间：2025-06-05修订日期：2025-06-22 |
| 基金项目: |
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| Effects of Pure and Mixed Leguminous Tree Plantations on Soil Active Organic Carbon Fractions and Carbon Pool Management Index in Karst Rocky Desertification Areas |
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ZHENG Jiaqi1, CHEN Jingwen2, ZHOU Xiaoguo2, WEN Yuanguang2, CHEN Jinlei2, SUN Dongjing2, ZHOU Xuemeng2, DENG Shaohong2, XU Junmao2, CHEN Qiuhai2, HUANG Yongjie2, WANG Lei1
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| (1.College of Forestry,Guangxi University;2.Institute of Ecology and Environment,Guangxi Academy of Sciences) |
| Abstract: |
| Vegetation restoration in karst rocky desertification areas plays a considerable ecological role in modulating the soil carbon pool. This study assessed three artificially established three plantation types in Mashan County, Guangxi—pure?Dalbergia odorifera plantation (PDOP), pure Acrocarpus fraxinifolius?plantation (PAFP), and mixed?Acrocarpus fraxinifolius?and?Dalbergia odorifera?plantation (MADP).Corn fields retained during afforestation served as the control，comparing soil labile organic carbon fractions [easily oxidizable carbon (EOC), dissolved organic carbon (DOC), microbial biomass carbon (MBC)], the carbon pool management index (CPMI), and their correlations with nitrogen and phosphorus nutrients in the 0-30 cm topsoil layer, to elucidate the effects of different restoration models on these soil carbon parameters.The results indicated that compared to the maize field (CK), all three forest stands?significantly increased the content of soil organic carbon (SOC) and labile carbon fractions in the topsoil layer (0-10 cm). Notably, the mixed plantation exhibited the highest dissolved organic carbon (DOC) (79.29 ± 9.87 mg·kg?1) and microbial biomass carbon (MBC) (501.66 ± 25.66 mg·kg?1) levels. Furthermore, both PDOP and the MADP significantly enhanced SOC content in the subsoil layer (10-30 cm).The CPMI in the topsoil layer (0-10 cm) exhibited the following order:?PAFP > MADP >?PDOP > CK. Notably, only the mixed plantation significantly increased the CPMI in the subsoil layer (10-30 cm). Correlation analysis revealed that CPMI was significantly positively correlated (P < 0.01) with soil total nitrogen (TN), alkali-hydrolyzable nitrogen (AN), and available phosphorus (AP) content, suggesting its potential as an effective evaluation indicator for rocky desertification control outcomes.The study demonstrated that mixed plantations of Leguminous(N-fixing) tree species?more effectively improved soil carbon pool quality?by enhancing carbon input and stimulating microbial activity. We therefore propose implementing?mixed plantations as the primary restoration model?with monocultures as supplementary in karst rocky desertification areas,?to promote soil carbon sequestration and fertility enhancement. |
| Key words: Rocky desertification vegetation restoration leguminous tree species soil active organic carbon carbon pool management index |
