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屈凡柱,孟灵,付战勇,孙景宽,刘京涛,宋爱云.不同生境条件下滨海芦苇湿地CNP化学计量特征研究.生态学报,2018,(5).http://dx.doi.org/10.5846/stxb201702020207  
不同生境条件下滨海芦苇湿地CNP化学计量特征研究
The stoichiometry characterization of Carbon, nitrogen and phosphorus in different reed-dominated coastal wetland habitats
投稿时间:2017-02-02  修订日期:2017-10-21
DOI: 10.5846/stxb201702020207
关键词CNP化学计量特征,不同生境,滨海芦苇湿地,黄河三角洲
Key WordsC, N and P stoichiometry  different habitats  reed-dominated coastal wetland  the Yellow River Delta
基金项目国家重点研发计划项目(2017YFC0505904);国家自然科学基金(41501088);山东省自然科学基金(ZR2015CL013);山东省高等学校 科技计划项目(J15LE16)
作者单位E-mail
屈凡柱 滨州学院--山东省黄河三角洲生态环境重点实验室 fanzhuqu@163.com 
孟灵 滨州学院  
付战勇 山东农业大学林学院  
孙景宽 滨州学院 sunjingkuan@126.com 
刘京涛 滨州学院  
宋爱云 滨州学院  
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摘要:
为阐明不同生境对黄河三角洲滨海芦苇湿地土壤和植物碳(C)氮(N)磷(P)含量及生态化学计量特征的影响,选取新生湿地和退耕湿地两种湿地类型为研究对象,对土壤和植物体CNP含量及其化学计量特征进行研究。研究表明:1)退耕芦苇湿地土壤TC、TN的含量明显增加,TP的含量变化不大。2)新生湿地和退耕湿地土壤RCNP分别为42.6:1.6:1、71.2:2.0:1,RNP低于全球平均水平(13.1)和我国平均水平(5.2),土壤表现为N限制。新生湿地土壤剖面中,RCN和RCP变化剧烈;RNP值随深度的增加而减小;退耕湿地土壤RCNP值规律性较好,RCN随深度的增加而变大,RCP和RNP值随深度的增加而减小。3)新生湿地和退耕湿地中芦苇整株RCN、RCP和RNP平均值分别为78.2、1753、22.4;67.0、1539、23.0。开垦活动可以降低芦苇植物体RCN和RCP值,但由于芦苇植物体本身对RNP的约束性较高,对RNP值的影响不大,芦苇植株RNP约为23。以上结论可以为黄河三角洲国家级自然保护区正在进行的湿地保护与恢复工作提供借鉴和参考。
Abstract:
Carbon (C), nitrogen (N), and phosphorus (P) are the three major chemical elements which exist in non-arbitrary ratios in different ecosystems. It has been showed that marine plankton is composed of C, N, and P in a characteristic molar ratio of 106:16:1, which is similar to the ratio of C, N, and P in marine water. The empirically developed stoichiometric ratio method, which has become widespread in marine and freshwater phytoplankton studies, has opened an avenue for coastal wetland ecosystems exploration. C, N, and P stoichiometry at different scales from molecules to organisms, and from ecosystems to the biosphere in previous studies have already been proven to be valuable in understanding various connections between trophic interactions and nutrient cycling. In order to reveal the impact of different reed-dominated coastal wetland habitats on the contents and the stoichiometry characterization of C, N and P of soil and plant in the Yellow River Delta, two typical wetlands of New-born wetland (NW) and farmland converted into wetland (FW) were selected as investigation subjects in the study. The results showed that the average content of soil total carbon (TC) and total nitrogen (TN) in NW was higher than that in FW. The significant difference of total phosphorus (TP) is not observed between NW and FW. The atomic C:N:P ratios (RCNP) in the soils (42.6:1.6:1, 71.2:2.0:1, respectively) and the plants (1753:22.4:1, 1539:23.0:1, respectively) of NW and FW were not well constrained. The average value for RNP was 1.6–2.0 in the soil, which was significantly lower than average global level (13.1) and China (5.2), suggested that N was limited in the soils of the Yellow River Delta. The RCN and RCP changed considerably with no obvious distribution patterns from the surface to bottom in the soil profiles of NW. The RNP was higher in the top soil and decreased slowly with depth. In the soil profiles of FW, the RCN changed dramatically and increased with depth and the RCP and RNP also decreased with depth. The RCN, RCP, and RNP of the reed plants averaged 78.2, 1753, and 22.4, respectively, for intact reed plants in new wetland, and 67.0, 1539, and 23.0, respectively, in farmland converted into wetland. Our results indicated that the decreases of RCN and RCP values for the reed tissues were subjected to anthropogenic cultivation. Although RCN and RCP varied widely among different wetland soils and plants, average RNP in the intact reed plant (about 23) was well constrained in the reed-dominated wetlands at regional scale of the Yellow River Delta. The results could potentially provide a useful reference for ongoing wetland conservation and restoration in the Yellow River Delta Natural Reserves.
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