可鲁克湖—托素湖保护区4种盐生植物生态化学计量特征

盐生植物是柴达木盆地高寒湿地的重要组成部分，对维护高原地区生态安全有着不可或缺的角色，选取可鲁克湖-托素湖自然护区内的柽柳(Tamarix chinensis)、盐爪爪(Kalidium foliatum)、芦苇(Phragmites australis)和白刺(Nitraria tangutorum)4种典型盐生植物群落为研究对象，分析不同植物及不同营养器官中C,N,P的生态化学计量特征。研究结果表明：4种植物不同器官的C,N,P含量存在明显的种间差异，4种盐生植物叶片的C∶N(19.29)略低于全球植物叶片的平均水平(22.50)、4种盐生植物叶片的C∶P(274.81)高于全球植物叶片C∶P平均水平(232.00),根系的C∶N,C∶P均高于全球水平。4种盐生植物具有较高的固碳优势和养分利用策略，有较强的碳同化能力。柽柳和芦苇两种植物生长主要受N元素限制，盐爪爪和白刺两种植物生长主要受P元素限制，表现出可鲁克湖—托素湖湿地自然保护区内不同植物对于营养元素的分配利用各有不同。

Ecological Stoichiometric Characteristics of Four Species of Halophytes in Keluke Lake-Tuosu Lake Reserve

Halophytes are an important part of the alpine wetlands of the Qaidam Basin and play an indispensable role in maintaining the ecological security of the plateau area. Four typical halophytic communities in the natural reserve of Lake Kluk-Tosu Lake were selected as the research objects:Tamarix chinensis,Kalidium foliatum,Phragmites australis and Nitraria tangutorum. The eco-stoichiometry characteristics of C,N and P in different plants and different vegetative organs were analyzed. The results showed that there were obvious interspecific differences in the contents of C,N and P in different organs of four plants. The average C∶N (19.29) of leaves of four halophytes was slightly lower than the global average of plant leaves (22.50),the average C∶P (274.81) of leaves of four halophytes was higher than the global average of C∶P of plant leaves (232.00),and the average C∶N and C∶P of root systems were higher than the global level. The results showed that the four halophytes had high carbon sequestration advantages and nutrient utilization strategies,and had strong carbon assimilation ability. The growth of tamarix and reed plants was mainly limited by N element,while the growth of Kalidium foliatum and Nitraria tangutorum was mainly limited by P element,indicating that different plants in the Keluk Lake-Tosu Lake Wetland Nature Reserve had different distribution and utilization of nutrients.