鄱阳湖沙山植物叶片与土壤C:N、C:P沿沙化梯度分布特征  

C∶N AND C∶P STOICHIOMETRY OF LEAF AND SOIL IN RESPONSE TO DESERTIFICATION GRADIENT IN A SANDY HILL ALONG POYANG LAKE

作　　者：付姗[1] 吴琴[1,2] 郑艳明[1] 胡启武[1,2] 

机构地区：[1]江西师范大学地理与环境学院,江西南昌330022 [2]鄱阳湖湿地与流域研究教育部重点实验室,江西南昌330022

出　　处：《长江流域资源与环境》2015年第3期447-454,共8页Resources and Environment in the Yangtze Basin

基　　金：江西省教育厅科技落地计划"鄱阳湖沙化土地与水土流失治理技术推广与示范"资助项目;国家自然科学基金项目(31270522;31460129)

摘　　要：在鄱阳湖多宝沙山沿沙化梯度测定了17种常见植物叶片及土壤有机碳(C)、全氮(N)、全磷(P)含量,以阐明沙山常见植物种与土壤C∶N、C∶P分布特征及对沙化的响应,为沙山植被恢复提供基础数据。结果表明:(1)植物叶片C∶N、C∶P分布范围为18.5~127.3、169.8~507.1,平均值分别为43.1、341.8;土壤0~10、10~30、30~50cm层C∶N变化范围分别为9.8~46.3、2.4~46.5和3.7~45.0;相应土层C∶P范围分别为19.8~75.9、3.0~90.5和4.7~76.5。(2)植物C∶N、C∶P对沙化的响应模式一致,均表现出在重度沙化区数值最小;土壤C∶N随沙化程度增加表现出降低趋势,而C∶P则表现出增加趋势,二者对沙化的响应不一致。(3)植物C∶N、C∶P变化主要取决于叶片的N、P含量;土壤C∶N的变化受控于土壤N含量;C∶P变化则决定于土壤有机C含量。There are some sandy hills distributed along Poyang Lake,which belong to typical southern desertification.As located in subtropical climate zone,the sandy hills differed in vegetation and soil from northern deserts.Since carbon(C),nitrogen(N)and phosphorous(P)stoichiometry are critical indicators of biogeochemical coupling in terrestrial ecosystems,the nutrients stoichiometry has been successfully used in indicating community succession,vegetation restoration and degenerative process in recent years.The C∶N and C∶P of plant leaf can indicate the ability of assimilating the carbon when the plant uptakes the N and P elements,as well as the nutrient use efficiency of plant.The C∶N and C∶P of soil can reflect organic matter decomposition and soil nutrient supply.In addition,the homoeostasis of C,N and P stoichiometry is the important mechanism maintaining ecosystem structure,function and stability.However,carbon,nitrogen and phosphorous stoichiometry of the sandy hills along Poyang Lake were still poorly understood.In this study,leaves of 17 dominant species and soil were sampled along desertification intensity gradient in Duobao sandy hill,Poyang Lake.Subsequently,leaf and soil organic carbon,total nitrogen and total phosphorous were measured.The objective of this study was to clarify C∶N and C∶P stoichiometry of leaf and soil in response to desertification intensity and provide a scientific basis for vegetation restoration.Results indicated that ratio of leaf carbon to nitrogen ranged from 18.5to 127.3,with mean of 43.1.The ratio of carbon to phosphorous varied from 169.8to 507.1,averaged at 341.8.The ratio of leaf carbon to nitrogen in high desertification intensity is 28.0,the ratio of carbon to phosphorous is 307.4.The ratio of leaf carbon to nitrogen in moderate desertification intensity is 59.5,and the ratio of carbon to phosphorous is 370.1.However,the ratio of leaf carbon to nitrogen in low desertification intensity is 39.0,while the ratio of carbon to phosphorous is 337.6.The soil C∶N value ra

关 键 词：鄱阳湖沙山 化学计量学 碳氮比 碳磷比 

分 类 号：Q948.1[生物学—植物学]