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【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。
【Objective】 Understanding of nutrient restriction of typical grassland in the upper reaches of Ili River provides a theoretical basis for nutrient cycling and plant-soil nutrient management of different grassland community types, and also provides a scientific basis for ecological environment improvement in this region. 【Method】 The contents of nitrogen, phosphorus, potassium and stoichiometry in plant-soil of different types of grassland were analyzed by field survey, sampling and indoor analysis. Correlation analysis was used. 【Result】 The contents of nitrogen, phosphorus and potassium in the aboveground and underground parts of plant communities varied greatly in different grassland types in the study area. The nitrogen contents in aboveground parts of mountain meadow steppes and alpine meadow plants> desert steppe, semi-desert steppe and alpine Nitrogen content in the meadow; nitrogen content in the underground part of the plants in the desert steppe and semi-desert steppe> nitrogen content in the mountain meadow steppe, mountain meadow and alpine meadow; P content in the aerial parts of the plant communities with N / There was a significant negative correlation between soil N and soil P, soil P and soil N / P, and soil N and soil N / P were highly correlated. The correlation coefficient was 0.983. 【Conclusion】 N deficiency in the soil of the study area can be considered in the grassland growth process appropriate to add nitrogen fertilizer.