自然资源学报 ›› 2012, Vol. 27 ›› Issue (12): 2081-2090.doi: 10.11849/zrzyxb.2012.12.009

• 资源生态 • 上一篇    下一篇

土地利用方式对喀斯特山区土壤养分及有机碳活性组分的影响

廖洪凯1, 龙健1, 李娟1,2   

  1. 1. 贵州师范大学 贵州省山地环境重点实验室, 贵阳 550001;
    2. 贵州师范大学 地理与环境科学学院, 贵阳 550001
  • 收稿日期:2011-12-04 修回日期:2012-04-24 出版日期:2012-12-20 发布日期:2012-12-20
  • 通讯作者: 龙健,E-mail:longjian33@163.com E-mail:longjian33@163.com
  • 作者简介:廖洪凯(1987-),男,广西桂林人,硕士研究生,主要从事喀斯特地区土壤碳循环方面的研究。E-mail:liaohongkaii@163.com
  • 基金资助:

    国家自然科学基金项目(40971160);贵州省优秀青年科技人才培养对象专项资金项目(黔科合人字[2009]21号);贵州省高层次人才科研经费项目(TZJF-2008-40号);贵州省科学技术基金(黔科合J字[2011]2046号)。

Effects of Different Land Use Patterns on Soil Nutrients and Soil Active Organic Carbon Components in Karst Mountain Area

LIAO Hong-kai1, LONG Jian1, LI Juan1,2   

  1. 1. Guizhou Key Laboratory of Mountain Environment, Guizhou Normal University, Guiyang 550001, China;
    2. Department of Geography and Environment Science, Guizhou Normal University, Guiyang 550001, China
  • Received:2011-12-04 Revised:2012-04-24 Online:2012-12-20 Published:2012-12-20

摘要:

通过对喀斯特山区5种土地利用方式(林地、 花椒林、 火龙果林、 退耕草丛和旱地)土壤养分和活性组分含量的比较研究,探讨了土壤质量对土地利用变化的响应。结果表明,林地土壤养分和活性组分含量最高,其中土壤有机碳、 微生物生物量碳、 氮、 磷、 易氧化有机碳和可溶性有机碳含量分别为44.80 g·kg-1、 477.86 mg·kg-1、 102.87 mg·kg-1、 17.54 mg·kg-1、 7.72 g·kg-1和166.43 mg·kg-1,土壤养分和活性组分含量总体按花椒林、 火龙果林、 退耕草丛和旱地依次下降。除旱地与经自然恢复15 a的退耕草丛土壤养分和活性组分含量较为接近,大多未达显著差异水平外,其他土地利用方式间土壤养分和活性组分均存在显著差异。冗余分析表明,土壤有机碳是影响活性组分变化的主要影响因子;花椒林对土壤养分和活性组分的累积效应仅次于林地,且明显高于火龙果林和旱地。研究阐明了喀斯特土壤的自然修复是一个非常缓慢的过程,需辅以必要的造林措施加速其恢复,花椒林可以作为喀斯特山区农业生产或生态恢复过程中优先考虑的植被类型。

关键词: 土壤, 有机碳活性组分, 养分, 土地利用方式, 喀斯特山区

Abstract:

Soil nutrients and six active components (microbial biomass C, N, P, basal respiration, easily oxidized organic carbon and dissolved organic carbon) under five typical land use patterns (forest, Chinese prickly ash orchard, pitaya orchard, grassland returning from farmland and dry land ) were measured to discuss soil quality in response to different land use patterns, providing scientific basis for selecting rational land use patterns and rocky desertification control in karst mountain areas. The results showed that the contents of soil nutrient and active component were the highest in forest, where soil organic carbon, microbial biomass C, N, P, easily oxidized organic carbon and dissolved organic carbon contents were 44.80 g·kg-1, 477.86 mg·kg-1, 102.87 mg·kg-1, 17.54 mg·kg-1, 7.72 g·kg-1 and 166.43 mg·kg-1, respectively, soil nutrient and active component contents were decreased in the order of Chinese prickly ash orchard, pitaya orchard, grassland returning from farmland and dry land. Except soil nutrient and active component contents in dry land were closer to grassland returning from farmland which had naturally recovered 15 a, mostly below the significant difference level, however, significantly differences in soil nutrient and active component were detected in other land uses. The RAD showed that soil organic carbon is a main impact factor to the active component. The cumulative effect to soil nutrients and active component in Chinese prickly ash orchard was only next to forest, but obviously higher than that in pitaya orchard and dry land. This study clarified that natural repair is a slow process which needs necessary afforestation measures in karst soil, and Chinese prickly ash orchard can be used as a priority vegetation in agricultural production or ecological restoration in karst mountain areas.

Key words: soil, active organic carbon component, nutrient, land use pattern, karst mountain area

中图分类号: 

  • S153.6