伊犁河上游典型草地生态系统氮磷含量及化学计量特征

发布时间：2018-05-02 02:16

本文选题：草地生态系统 + 化学计量特征　；参考：《南京林业大学学报(自然科学版)》2017年03期

【摘要】：【目的】了解伊犁河上游典型草地养分限制状况,为不同草地类型群落营养循环及植物-土壤养分管理提供理论依据,也为该区域生态环境的改善提供科学依据。【方法】通过野外调查采样和室内分析测定,采用相关性分析方法,分析了不同类型草地群落植物-土壤氮、磷、钾含量及化学计量学特征。【结果】研究区不同草地类型植物群落植物地上部分和地下部分根系的氮、磷、钾含量变异较大,山地草甸草原和高寒草甸植物地上部分氮含量荒漠草原、半荒漠草原和高寒草甸的氮含量;荒漠草原和半荒漠草原植物地下部分根系的氮含量山地草甸草原、山地草甸和高寒草甸的氮含量;不同草地群落类型植物地上部分的P含量与植物N/P比值呈显著负相关,土壤N与土壤P含量、土壤P含量与土壤N/P比值分别呈显著正相关,土壤N和土壤N/P比值极显著相关,其相关系数为0.983。【结论】研究区土壤氮素缺乏,可以考虑在草地生长过程中适当添加氮肥。
[Abstract]:[objective] to understand the nutrient limitation of typical grassland in the upper reaches of Yili River, and to provide theoretical basis for nutrient cycling and plant-soil nutrient management in different grassland communities. It also provides the scientific basis for the improvement of ecological environment in this region. [methods] through field investigation and indoor analysis and determination, correlation analysis method was used to analyze different types of grassland plant-soil nitrogen and phosphorus. [results] the nitrogen, phosphorus and potassium contents in the roots of the aboveground and underground parts of plant communities of different grassland types varied greatly in the study area. Nitrogen content in the aerial parts of the desert steppe, the semi-desert steppe and the alpine meadow, the nitrogen content of the underground roots of the desert steppe and the semi-desert steppe, the nitrogen content of the mountain meadow steppe, The nitrogen content of mountain meadow and alpine meadow, P content of plant aboveground of different grassland community type and plant N / P ratio were significantly negative correlation, soil N and soil P content, soil P content and soil N / P ratio were significantly positive correlation, respectively. The correlation coefficient between soil N and soil N / P ratio was 0.983.Conclusion the soil nitrogen deficiency in the study area could be considered by adding appropriate nitrogen fertilizer in the course of grassland growth.
【作者单位】：河北工程大学;中国科学院新疆生态与地理研究所荒漠与绿洲生态国家重点实验室;中国农业科学院;南方现代林业协同创新中心南京林业大学生物与环境学院;
【基金】：国家自然科学基金项目(41471191,41375149) 江苏省“青蓝工程”资助项目(苏教师[2016]15号) 江苏高校优势学科建设工程资助项目(PAPD)
【分类号】：S812

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