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中国农学通报

中国农学通报 ›› 2011, Vol. 27 ›› Issue (24): 69-73.

• 农学 农业基础科学 • 上一篇    下一篇

当雄退化草甸土壤有机碳分布特征及其与土壤主要养分的关系

曹丽花 刘合满 赵世伟   

  • 收稿日期:2011-04-13 修回日期:2011-06-27 出版日期:2011-09-25 发布日期:2011-09-25

Distribution of Soil Organic Carbon and the Relation Between SOC and Soil Nutrient on Degraded Alpine Meadow

  • Received:2011-04-13 Revised:2011-06-27 Online:2011-09-25 Published:2011-09-25

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摘要：

为揭示高寒草甸土壤退化过程中有机碳及相关养分和环境的变化特点，以西藏当雄高寒草甸为研究对象，采用野外调查和室内分析法研究不同退化高寒草甸土壤（0~10 cm和10~20 cm 2个土层）有机碳分布及与土壤主要养分因子的关系。结果表明，土壤有机碳、活性有机碳及速效养分含量均表现为：正常草甸>轻度退化草甸>严重退化草甸，且0~10 cm土层中有机碳含量均高于10~20 cm土层土壤。回归分析表明，土壤有机碳与土壤碱解氮、速效磷、速效钾之间存在极显著正相关关系（P<0.01），回归系数分别为0.9131、0.9466和0.9701。草甸的退化引起土壤主要养分物质含量的降低，将加速草地退化，不利于退化草甸的自然恢复。

关键词: 水稻, 水稻, 免耕, 土壤酶

Abstract:

To elucidate the changing characteristics of soil organic carbon and soil nutrient on degraded alpine meadow. With field survey and lab analyses, we studied the distribution of soil organic carbon (SOC), labile organic carbon and relation between SOC and soil nutrient on degraded alpine meadow (0-10 cm and 10-20 cm) in Dangxiong. Results showed that the change order of SOC, labile organic carbon and main nutrients content in 0-10 cm and 10-20 cm: normal grassland > slightly degraded grassland > seriously degraded grassland and SOC content was higher in 0-10 cm than 10-20 cm. Regression analysis showed that there were significantly positive relationships between soil organic carbon to alkali-hydrolyzable nitrogen, available P, available K. The regression coefficient was 0.9131, 0.9466 and 0.9701, respectively. Soil nutrient were decreased with the increase of meadow degradation degree and accelerated the degradation of meadow.