石梅湾3种植物叶片与其群落凋落物C,N,P生态化学计量特征研究

摘要：

研究植物叶片和凋落物碳(C)、氮(N)、磷(P)含量和计量比对阐明植物群落生理过程及维持生态系统养分平衡至关重要。以石梅湾青皮林、木麻黄林和红树林为研究对象,通过测定建群种叶片和凋落物C,N和P含量,并分析其化学计量学特征与差异。结果表明:1)3种植物叶片C,N,P含量均显著高于凋落物(P<0.05),相反,其化学计量比显著低于凋落物;2)3种植物叶片N,P的养分再吸收效率表现为P(44.49~62.63%)大于N(18.96~34.37%),说明对P元素的养分再吸收能力较强;3)3种植物叶片N:P比值依次为青皮(16.03)、木麻黄(15.18)和拉关木(8.04),说明青皮生长倾向于受P限制,木麻黄生长倾向于受N和P共同限制,拉关木生长倾向于受N限制。研究结果可为海岸带森林生态系统的可持续发展提供科学依据。

关键词: 植被类型, 凋落物, 养分质量分数, 生态化学计量特征

Abstract:

It is important to study the contents and quantitative comparisons of carbon(C),nitrogen(N) and phosphorus(P) in plant leaves and litters.In order to elucidate plant community physiological processes and maintain nutrient balance in the ecosystem,this paper is infended for the study of wanning city vatica Forest,casuarina forests and mangroves.By measuring the C,N,and P in the leaves and their community litters of Vatica mangachapoi,Casuarina equisetifolia,and Laguncularia racemosa,the stoichiometric characteristics and differences of C,N,and P in the leaves and their communities of three kinds of plants are analyzed.The results show that the contents of C,N and P in the leaves of the three plants are significantly higher than those of litters(P<0.05).On the contrary,their stoichiometric ratios are significantly lower than those of litters.The nutrients resorption efficiencies of N and P are different,ranging in 18.96%~34.37%,and 44.49%~62.63%,respectively.Among them,P is larger than N,indicating that the nutrient reabsorption capacity of element P is strong.The ratio of N:P of the three plants was V.mangachapoi(16.03)>C.equisetifolia(15.18)>L.racemosa(8.04).The V.mangachapoi tend to be restricted by phosphors(P),C.equisetifolia tends to be restricted by phosphors(P) and nitrogen(N),and the L.racemosa tend to be restricted by nitrogen(N).The results can provide scientific basis for the sustainable development of forest ecosystem in coastal zone.

Key words: vegetation types, litter, nutrient concentration, ecological stoichiometry characteristics

中图分类号: 

S718.5

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