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。
Soil nutrients and six active components （microbial biomass C, N, P, basal respira- tion, easily oxidized organic carbon and dissolved organic carbon） under five typical land use pat- terns （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, provi- ding scientific basis for selecting rational land use patterns and rocky descrtification 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 or- chard, 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 for- est, 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.
出处
《自然资源学报》
CSSCI
CSCD
北大核心
2012年第12期2081-2090,共10页
Journal of Natural Resources
基金
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)
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
soil
active organic carbon component
nutrient
land use pattern
karst mountain area
