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• 研究报告 • 上一篇    下一篇

青藏高原土壤可溶性氮组成特征

王洁1,2,杨曦1,朱兆洲1,李鹤1,2,牛颖权1,2,刘小龙1,张伟3,李军1**   

  1. (1天津师范大学天津市水资源与水环境重点实验室, 天津 300387; 2天津师范大学城市与环境科学学院, 天津 300387; 3贵州师范学院地理与旅游学院, 贵阳 550018)
  • 出版日期:2015-06-10 发布日期:2015-06-10

Characteristics of soluble nitrogen in soils on the Tibetan Plateau, China.

WANG Jie1,2, YANG Xi1, ZHU Zhao-zhou1, LI He1,2, NIU Ying-quan1,2, LIU Xiao-long1, ZHANG Wei3, LI Jun1**   

  1. (1Tianjin Key Laboratory of Water Resources and Environment, Tianjin Normal University, Tianjin 300387, China; 2 College of Urban and Environmental Science, Tianjin Normal University, Tianjin 300387, China; 3School of Geography and Tourism, Guizhou Normal College, Guiyang 550018, China)
  • Online:2015-06-10 Published:2015-06-10

摘要:

对青藏高原不同海拔(2500~5500 m)、不同植被类型(高寒草原、高寒草甸、草地、林地、荒漠、盐碱地等)土壤可溶性氮的组成特征及其影响因素进行了研究。结果表明:青藏高原土壤总可溶性氮(TSN)含量丰富,以可溶性有机氮(SON)为主,SON占TSN的比例达50%以上,且硝态氮(NO3--N)占可溶性无机氮(SIN)比例显著高于铵态氮(NH4+-N),NO3--N占SIN的比例达60%以上。方差分析表明,不同海拔梯度间土壤可溶性氮含量差异显著,高寒草原与高寒草甸的TSN及SON含量显著高于其他植被类型。土壤pH与不同形态可溶性氮均呈负相关关系,是影响土壤不同形态可溶性氮的重要因素。逐步回归分析表明,对土壤NH4+-N影响最为显著的气候因子是生长季相对湿度,而对土壤NO3--N影响最为显著的气候因子是生长季温度。
 

关键词: 光能利用效率, 水分利用效率, CO2浓度, 光响应机理模型, 大豆

Abstract: An investigation on soil soluble nitrogen and its influence factors was carried out in different vegetation types (alpine steppe, alpine meadow, grassland, forest land, desert, and saline land) along different altitudes (2500-5500 m) on the Tibetan Plateau, China. The results showed that total soluble nitrogen (TSN) in the soils appeared at high levels, and the major form of soil soluble nitrogen was soluble organic nitrogen (SON), accounting for 50% of TSN. In addition, the proportion of NO3--N to soluble inorganic nitrogen (SIN) was higher (60%) than that of NH4+-N. Variance analysis showed that the difference of soil soluble nitrogen was significant at different altitudes, and TSN and SON in alpine steppe and alpine meadow were significantly higher than in the other vegetation types. Soil pH was negatively correlated with 〖JP2〗the different forms of soil soluble nitrogen, suggesting that soil pH was an important factor impacting soil soluble nitrogen. Stepwise regression analysis showed that air relative humidity and temperature in growing season were the most significant factors impacting soil NH4+-N and NO3--N, respectively.

Key words: mechanistic model of light-response, light-use efficiency, CO2 concentration., wateruse efficiency, soybean