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| 土地利用类型和水热条件影响喀斯特地区土壤无机磷 和生物有效磷组分的特征 |
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杨倩1, 张伟2,4, 梁月明3, 王克林2,4, 胡培雷2,4, 潘复静1
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1.桂林理工大学 环境与工程学院 广西环境污染控制理论与技术重点实验室,广西 桂林 541006； 2. 中国科学院 亚热带农业生态研究所 中国科学院亚热带农业生态过程重点实验室,长沙 410125； 3.中国地质科学院岩溶地质研究所 自然资源部岩溶动力学重点实验室,广西 桂林 541000； 4. 河池环江农田生态系统广西野外科学观测研究站,广西 环江 547100
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| 摘要: |
| 为了解喀斯特地区土地利用类型和水热条件影响土壤无机磷和生物有效磷组分的特征，该文分析比较了低水热地区重庆南川区、贵州独山县和绥阳县以及高水热地区广西环江县、马山县/武鸣县和龙州县的喀斯特地区耕地、人工林和天然林土壤无机磷和生物有效磷组分的变化特征。采用单因素方差分析、双因素方差分析和相关性分析，探讨土地利用类型和水热条件影响下土壤无机磷组分和生物有效磷组分的差异特征以及两者之间的关系，采用冗余分析探究影响土壤生物有效磷组分的关键无机磷组分。结果显示：（1）土壤无机磷组分受土地利用类型显著影响，耕地土壤中磷酸二钙（Ca2-P）、磷酸八钙（Ca8-P）、铝结合态磷（Al-P）、铁结合态磷（Fe-P）、闭蓄态磷（O-P）和磷酸十钙（Ca10-P）含量均高于人工林和天然林土壤。Ca8-P、Fe-P和O-P含量表现为耕地>人工林>天然林，Ca2-P和盐酸磷（HCl-P）含量则表现为耕地>天然林>人工林；（2）在高水热地区，天然林土壤Ca10-P和O-P含量显著高于低水热地区，人工林和天然林土壤的酶提取磷（Enzyme-P）含量则与之相反；（3）土壤无机磷组分Ca2-P、Ca8-P、Al-P、Fe-P和Ca10-P含量与生物有效磷组分CaCl2-P和HCl-P含量呈显著正相关，冗余分析表明，Ca2-P是影响生物有效磷组分的关键因子。上述结果表明，土地利用类型和水热条件是影响土壤无机磷组分及生物有效磷组分特征的关键因素，无机磷组分含量的提高对生物有效磷组分具有正向作用。因此，应考虑未来气候变化可能对土壤中磷的形态及其有效性产生的影响，以推进喀斯特生态系统恢复。 |
| 关键词: 喀斯特生态系统，土地利用类型，水热条件，无机磷形态，生物有效磷 |
| DOI：10.11931/guihaia.gxzw202402027 |
| 分类号: |
| Fund project:国家自然科学基金（U20A2011，42261011，32271730）；国家重点研发计划项目课题（2022YFF1300704）；广西重点研发项目（桂科AB24010051）；中国地质科学院岩溶地质研究所基本科研业务费项目（2023020） |
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| Characterisation of soil inorganic phosphorus and bioavailable phosphorus fractions in karst ecosystems, influenced by land use types and hydrothermal conditions |
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YANG Qian1, ZHANG Wei2,4, LIANG Yueming3, WANGKelin2,4, HU Peilei2,4, PAN Fujing1
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1. College of Environmental and Engineering, Guangxi Key Laboratory of Theory and Technology for Environmental Pollution Control, Guilin University of Technology, Guilin 541006, Guangxi, China; 2. Key Laboratory of Agro-Ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China; 3. Karst Dynamics Laboratory, Ministry of Natural Resources, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, Guangxi, China; 4. Huanjiang Agriculture Ecosystem Observation and Research Station of Guangxi, Guangxi Key Laboratory of Karst Ecological Processes and Services, Huanjiang Observation and Research Station for Karst Ecosystems, Chinese Academy of Sciences, Huanjiang 547100, Guangxi, China
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| Abstract: |
| In order to gain an understanding of the characteristics of soil inorganic phosphorus and bioavailable phosphorus fractions affected by land use types and hydrothermal conditions in karst ecosystems, the characteristics of soil inorganic phosphorus and bioavailable phosphorus fractions in karst ecosystems were analyzed and compared across croplands, artificial forests, and natural forests in low hydrothermal regions (Nanchuan District in Chongqing, Dushan and Suiyang Counties in Guizhou) and high hydrothermal regions (Huanjiang, Mashan County/Wuming, and Longzhou Counties in Guangxi). One-way analysis of variance, two-factor analysis of variance, and correlation analysis were used to explore the different characteristics and the relationship between soil inorganic phosphorus fractions and bioavailable phosphorus fractions under the influence of land use types and hydrothermal conditions. Redundancy analysis was used to explore the key inorganic phosphorus fractions influencing soil bioavailable phosphorus fractions. The results were as follows: (1) Soil inorganic phosphorus fractions were significantly affected by land use types. The contents of dicalcium phosphate (Ca2-P), octacalcium phosphate (Ca8-P), phosphorus adsorbed on the Al oxides surfaces (Al-P), phosphorus adsorbed on the Fe oxides surfaces (Fe-P), occluded phosphorus (O-P) and decalcium phosphate (Ca10-P) in the soils of croplands were found to be higher than those in the soils of artificial forests and natural forests. Furthermore, the contents of Ca8-P, Fe-P and O-P exhibited the order of croplands > artificial forests > natural forests, whereas the contents of Ca2-P and phosphorus extracted by hydrochloric acid (HCl-P) demonstrated the order of croplands > natural forests > artificial forests. (2) In high hydrothermal regions, Ca10-P and O-P contents of natural forests soils were significantly higher than in low hydrothermal regions, and phosphorus extracted by enzymes (Enzyme-P) contents of artificial and natural forests soils were the opposite. (3) Soil inorganic phosphorus fractions Ca2-P, Ca8-P, Al-P, Fe-P and Ca10-P contents were significantly and positively correlated with bioavailable phosphorus fractions CaCl2-P and HCl-P contents. Redundancy analysis showed that Ca2-P was the key factor affecting the bioavailable phosphorus fractions. The results indicate that land use types and hydrothermal conditions are key fraction influencing the characteristics of soil inorganic phosphorus fractions and bioavailable phosphorus fractions. Increasing the contents of inorganic phosphorus fractions has a positive effect on bioavailable phosphorus fractions. Therefore, consideration should be given to the potential effects of future climate change on the fractions and availability of phosphorus in soil, thereby promoting the restoration of karst ecosystems. |
| Key words: karst ecosystem, land use types, hydrothermal conditions, inorganic phosphorus fractions, bioavailable phosphorus |
