中文摘要：

采用野外调查和室内分析相结合的方法,对宁夏阅海湿地芦苇和香蒲植物叶片和土壤碳（C）、磷（P）和氮（N）季节动态及其累积进行研究.结果表明：阅海湿地2种植物叶片C、P、N含量高于土壤C、P、N;土壤C、P、N含量随土层加深均呈现出下降的趋势,“表聚性”较明显;不同季节土壤和叶片C、P、N含量均表现为芦苇＞香蒲,2种植物土壤C、P、N含量随季节变化均表现为先增加后降低,秋季达到最大;2种植物土壤C/N随季节变化表现为增加趋势,N/P随季节变化表现为降低趋势,C/P则无明显变化规律;2种植物叶片C含量随季节变化表现为增加趋势,P和N含量随季节变化表现为先增加后降低,C/N和C/P随季节变化表现为“V”形规律,N/P表现为春季、夏季显著高于秋季、冬季（P＜0.05）;2种植物C累积量在冬季最大,春季最小,P和N累积量在秋季最大,春季最小;相关性分析表明2种湿地植物C、P、N累积量更依赖于土壤C、P、N和含水量;2种植物叶片C、C/N、C/P、N/P与分别与土壤C、C/N、C/P、N/P呈显著相关关系（P＜0.05）,可以用不同的曲线拟合;从N/P比值来看,氮素成为阅海湿地2种植物生产力的重要限制因子.

英文摘要：

Accumulation features and seasonal dynamics of the contents of carbon （C）, nitrogen （N） and phosphorus（P） in leaves of Phragmites australi and Typha orientalis and their planting soil in Yuehai wetland in Ningxia Hui autonomous region were studied by field investigation and indoor analysis. It was indicated that the contents of C, N and P in leaves of the 2 plants were higher than those in planting soil and they tended to decline in the deeper soil, showing a significant “surface accumulation” effect. In different seasons, the contents of C, N and P in both leaves and planting soil of Phragmites australis were higher than those of Typha orientalis. In the planting soil of the 2 plant species, the contents of C, N and P firstly increased and then decreased with the changing seasons, which peaked in autumn, and the ratio of C/N steadily increased while the N/P decreased. In plant leaves, the content of C increased with the changing seasons while P and N content increased firstly and then decreased. The seasonal changes of the ratios of C/N and C/P showed a “V” shape tendency while the ratios of N/P in spring and summer were significantly higher than those in autumn and winter（P〈0. 05）. In leaves of 2 plant species, the accumulation of C was the largest in winter but the smallest in spring. For N and P, the accumulation amount were the largest in autumn but the smallest in spring. Correlation analysis showed that the accumulative contents of C, P and N in plant leaves strongly depended on the contents of C, P and N in the soil and also relied on soil moisture content. Different methods of curve fitting were applied in demonstrating the significant correlations in the content of C and ratios of C/ N, C/P and N/P between plant leaves and planting soil（P〈0.05）. Based on the results about N/P ratio, it can be concluded that nitrogen is an important limiting factor in the productivity of these two wetland plants in Yuehai.