| 刘金炽，招礼军，朱栗琼，权佳惠，金 赟.喀斯特地区泡核桃林土壤酶、微生物量及无机氮的动态研究[J].广东农业科学,2020,47(10):83-92 |
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喀斯特地区泡核桃林土壤酶、微生物量及无机氮的动态研究 |
| Dynamics Study on Soil Enzyme Activity, Microbial Biomass and Inorganic Nitrogen of Juglans sigillata Forest in Karst Area |
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| DOI：10.16768/j.issn.1004-874X.2020.10.011 |
| 中文关键词: 泡核桃 造林年限 水解酶 氧化酶 微生物量碳氮 铵态氮 硝态氮 |
| 英文关键词: Juglans sigillata afforestation years hydrolase oxidase microbial biomass carbon and nitrogen nitrate nitrogen ammonium nitrogen |
| 基金项目:广西创新驱动发展专项（科技重大专项）基金（AA17204058-11）；国家退耕还林工程生态效益监测项目 |
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| 中文摘要: |
| 【目的】泡核桃林的土壤质地是决定核桃产量的重要因素。开展喀斯特地区泡核桃林土壤肥力状况及微生物群体功能年际变化的研究，不仅有助于指导泡核桃科学高效地生产，而且能为该地区的石漠化治理、土地修复实践提供理论基础。【方法】对喀斯特地区不同种植年限（4、5、6、7 年）泡核桃林土壤酶活性、微生物生物量（碳、氮）及无机氮（硝态氮、铵态氮）的变化及其相关性进行测定和分析。【结果】（1）泡核桃种植 5、6 年后，土壤酶活性普遍高于种植 4、7 年。（2）随着种植年限的增加，微生物量碳呈先增后降的趋势，而微生物量氮逐渐增加，且种植 5、6、7 年后差异不显著；泡核桃种植 4 年后的微生物量碳氮含量均极显著低于其他年限。（3）随着种植年限的增加，铵态氮含量呈波动式变化，硝态氮先增后减，且种植 6 年后的硝态氮含量极显著高于其他年限处理。（4）酶活性、微生物量和无机氮含量均随着土层深度（0~10、10~20、20~30 cm）的增加而降低，显示出明显的“表聚现象”。（5）酶活性、微生物量和无机氮含量三者之间具有不同程度的相关性。【结论】总体来看，泡核桃林的建立有利于喀斯特地区的土壤发育。在泡核桃种植 7 年后，应注重水肥管理以提升泡核桃果实的质量，同时为该区的生态恢复提供基础条件。 |
| 英文摘要: |
| 【Objective】Soil texture is an important factor for the yield of Juglans sigillata. The study on soil fertility and microbial community function in karst area is not only helpful to guide the scientific and efficient production of Juglans sigillata, but also to provide theoretical basis for the rocky desertification control and land restoration practice in this area.【Method】To better understand the changes in soil conditions after forestation, the changes in three components-soil enzyme activity, microbial biomass（carbon, nitrogen）and inorganic nitrogen（nitrate nitrogen, ammonium nitrogen）-in the J. sigillata forests had been planted for different periods（4, 5, 6 and 7 years）in the karst area were measured and analyzed.【Result】（1）After 5 and 6 years’ planting of J. sigillata, soil enzyme activity was generally higher than that after 4 and 7 years’ planting.（2）With the increase of planting years, soil microbial biomass carbon showed a trend of increasing first and then decreasing, while the microbial biomass nitrogen gradually increased, and there was no significant difference after 5, 6 or 7 years’ planting. The soil microbial biomass carbon and nitrogen contents after 4 years’ planting were significantly lower than those of other planting years.（3）With the increase of planting years, ammonium nitrogen content showed a fluctuating trend, while the nitrate nitrogen content increased first and then decreased, and the nitrate nitrogen after 6 years’ planting was significantly higher than that of other planting years.（4）The soil enzyme activity, microbial biomass and inorganic nitrogen contents all decreased with the increase of soil depth（0-10, 10-20 and 20-30 cm）, showing an obvious surface aggregation phenomenon.（5）Soil enzyme activity, microbial biomass and inorganic nitrogen contents had
correlation to different degrees.【Conclusion】Generally speaking, the afforestation of J. sigillata forests is beneficial to the soil development in karst area. In addition, attention should be paid to water and fertilizer management after 7 years’ planting to improve the quality of J. sigillata fruits, and provide basic conditions for ecological restoration in this area. |
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