| 韩小美,陆湘云.模拟酸沉降对桉树纯林和混交林土壤化学性质的影响[J].广东农业科学,2019,(9-10):- |
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模拟酸沉降对桉树纯林和混交林土壤化学性质的影响 |
| Effects of simulated acid deposition on soil chemical properties of Eucalyptus pure and mixed forests |
| 投稿时间：2019-05-19 修订日期：2019-08-01 |
| DOI： |
| 中文关键词: 酸沉降 桉树纯林 桉树+红椎混交林 土壤养分 淋洗液 |
| 英文关键词: Acid deposition Eucalyptus pure forest Eucalyptus + Redwood mixed forest Soil nutrients Leachate |
| 基金项目:广西创新驱动发展专项资金项目,桉树用材林质量精准提升关键技术研究与集成示范,(桂科 AA17204087-6） 广西自然科学基金，速生桉人工林纯林及混交林凋落叶分解对酸沉降的缓冲机制研究，（2015GXNSFAA139081） |
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| 中文摘要: |
| 【目的】研究在不同酸度的模拟酸雨下,桉树纯林和桉树+红椎混交林土壤及土壤淋洗液的pH值和养分含量的变化。【方法】采用不同酸度的模拟酸雨,通过严格的土柱淋洗试验。【结果】酸处理下两种林分土壤pH值和淋洗液pH值均随酸雨pH的降低而降低,两种林分土壤淋洗液养分含量表现为随酸雨pH的降低而增加的规律,两种林分土壤全N、铵态N、硝态N含量均表现为随酸雨pH的降低先增加后降低的规律,全P在桉树纯林中表现为随酸雨pH的降低而显著降低的状态,而在桉树+红椎混交林中土壤全P无显著的变化,速效P的变化规律与全P基本一致,说明酸雨淋溶主要影响桉树纯林土壤P素含量,对混交林P素含量影响不大。同一pH(pH=3.0),两种林分土壤N素含量下降率相比可知,全N和铵态N在桉树+红椎混交林中下降率远远小于桉树纯林,硝态氮在两种林分中下降率无明显差异。【结论】模拟酸雨沉降下,桉树+红椎混交林对酸雨的缓冲能力远远强于桉树纯林,在造林方面我们可以选择在酸雨地区营造混交林来缓解林木养分缺失情况。 |
| 英文摘要: |
| 【Objective】 To study the changes of pH value and nutrient content of soil and soil leachate in pure eucalyptus forest and mixed Eucalyptus + Red vertebra forest under simulated acid rain with different acidity. 【Method】Simulated acid rain with different acidity was carried out through rigorous soil column leaching test. 【Result】Soil pH value and leachate pH value of the two stands decreased with the decrease of acid rain pH. The nutrient content of soil leachate of the two stands increased with the decrease of acid rain pH. Total N, ammonium N and nitrate N contents of the two stands increased first and then decreased with the decrease of acid rain pH. Total P in pure eucalyptus forest showed the decrease of acid rain pH. However, there was no significant change in soil total P in Eucalyptus + Red Vertebra mixed forest. The change rule of available P was basically the same as that of total P, indicating that acid rain leaching mainly affected P content in soil of pure Eucalyptus forest, but had little effect on P content in mixed forest. At the same pH (pH=3.0), the decrease rate of soil N content in the two stands was much lower than that in the Eucalyptus + Mangrove mixed forest. There was no significant difference in the decrease rate of nitrate nitrogen between the two stands. 【Conclusion】Under simulated acid rain deposition, the buffer capacity of Eucalyptus + Red Vertebra mixed forest to acid rain is much stronger than that of Eucalyptus pure forest. In afforestation, we can choose to build mixed forest in acid rain area to alleviate nutrient deficiency. |
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