典型喀斯特峰丛洼地植被群落凋落物C∶N∶P生态化学计量特征
Litter C∶N∶P ecological stoichiometry character of plant communities in typical Karst Peak-Cluster Depression
查看参考文献37篇
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文摘
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为了解典型喀斯特峰丛洼地植被群落凋落物养分空间分异以及其生态化学计量特征,分析了4个不同演替阶段植被凋落物现存量,C,N,P含量及C,N,P元素比值关系在不同坡位间的差异.结果表明:(1)不同演替阶段群落凋落物现存量和C,N,P含量,N∶P值随植被正向演替而升高;C∶N值和C∶P值随植被正向演替而下降.(2)凋落物C含量,C∶N值,C∶P值和N∶P值在不同坡位表现为上坡位较高,下坡位较低;P含量的变化规律与之相反,N含量则没呈现很明显的规律性(P<0.05).典范对应分析(CCA)结果表明演替阶段和坡位对凋落物积累,养分分布和存储影响最大,坡度,坡向和裸岩率也有较大影响.(3)N∶P值是制约凋落物分解和养分循环的重要因素.凋落物在P素较低的情况下具有较高的N及木质素含量(即较高的N∶P值),分解速率较低,较低的N∶P值使凋落物更易分解.N素在3个坡位的不显著差异以及P素的显著差异反映了P含量波动对喀斯特峰丛洼地植被凋落物N∶P值和分解速率变化的影响.推测下坡位及幼龄林群落由于具有较低的N∶P值,其凋落物分解速率相对较快,养分的存储量较少.因此,上坡位,成熟林群落的凋落物有利于积累养分 |
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其他语种文摘
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Ecological stoichiometry theory, which was put forward to investigate nutrient cycling of marine ecosystem by Reiners, has been incorporated successfully into many research fields such as decomposition dynamics, nutrient cycling and biology ecological response to global change and so on. The ratio of carbon∶nitrogen∶phosphorus(C∶N∶P) in planktonic biomass was found to be well-constrained in marine ecosystem. Some analyses indicated the existence of analogous ratios in plants, suggesting that the theory may be applicable in terrestrial ecosystems. Here we tested if the ecological stoichiometry theory is applicable to the typical Karst Peak-Cluster Depression, where our previous studies showed that soil nutrient in the upward slope was higher than in the downward slope. It was speculated that the possible reason could be that the litter carbon, nitrogen, phosphorus and carbon: nitrogen: phosphorus(C∶N∶P) ratio were the same as soil nutrient. It was also inferred that litter C∶N∶P ratio could play an important role in the decomposition and nutrient cycling of Karst forested ecosystems. In this study, the slope gradients of litter carbon, nitrogen, phosphorus and their mass ratio in four vegetation succession stages was analyzed in order to understand the spatial differentiation and ecological stoichiometry trail of litter nutrient of plant communities in the typical Karst Peak-Cluster Depression. The results of this study showed that(1) carbon, nitrogen, phosphorus and N∶P ratio in litter standing crops increased from the early to the later succession stages, while the ratio of C:∶N and C∶P decreased.(2) The content of litter carbon, ratio of C∶N,C∶P and N∶P in upward slope were larger than that in downward slope, while the reverse trend was exhibited in phosphorus content and no significantly different nitrogen content was observed among slopes(P<0.05).The result of Canonical Correspondence Analysis(CCA) showed that the succession stages and slope position had greater impact on the litter accumulation, nutrient distribution and storage, compared to that of slope and bare rock.(3) It is known that the litter decomposition and nutrient cycling is mainly constrained by the N∶P ratio. Previous research indicated that litter P concentrations and low N∶P ratio did not limit decomposition, but litter N concentrations and high N∶P ratios showed contrary results. The lack of significant differences among N elements among slopes and significant difference of P elements reflected that the fluctuations of P content affected vegetation litter N∶P ratio and the changing decomposition rate in typical Karst Peak-Cluster Depression. Lower N and high lignin content(namely higher N∶P ratio) under the case of low P leading decomposition rate become lower, thus lower N∶P ratio is easy for litter decomposition. It is presumed that litter decomposed faster in the downward slope and in young-growth plant communities than that in the upward slope and in old-growth plant communities due to the lower N∶P ratio. As a result, less litter nutrient was stored in the downward slope and in young-growth plant communities. Therefore, litter in the upward slope, old-growth forests were conducive to the accumulation of nutrients |
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来源
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生态学报
,2011,31(2):335-343 【核心库】
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关键词
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喀斯特峰丛洼地
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凋落物
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养分含量
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养分归还
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C∶N∶P生态化学计量
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地址
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1.
广西师范大学生命科学学院, 中国科学院亚热带农业生态过程重点实验室, 湖南, 410125
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中国科学院环江喀斯特生态系统观测研究站, 中国科学院亚热带农业生态过程重点实验室, 湖南, 410125
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广西师范大学生命科学学院, 桂林, 541004
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广西木论国家级自然保护区管理局, 广西, 环江, 547100
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-0933 |
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学科
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环境科学基础理论 |
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基金
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中国科学院知识创新工程重要方向项目
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国家自然科学基金项目
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国家科技支撑计划项目
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中国科学院知识创新工程青年人才领域前沿项目
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文献收藏号
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CSCD:4120014
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参考文献 共
37
共2页
|
|
1.
Vasconcelos H L. Litter production and litter nutrient concentrations in a fragmented amazonian landscape.
Ecological Applications,2004,14(3):884-892
|
被引
11
次
|
|
|
|
|
2.
高志红. 森林凋落物生态功能研究概况及展望.
东北林业大学学报,2004,32(6):79-83
|
被引
35
次
|
|
|
|
|
3.
Rinnan R. Mineralization and carbon turnover in subarctic heath soil as affected by warming and additional litter.
Soil Biology & Biochemistry,2007,39:3014-3023
|
被引
17
次
|
|
|
|
|
4.
Rinnan R. Effects of litter addition and warming on soil carbon, nutrient pools and microbial communities in a subarctic heath ecosystem.
Applied Soil Ecology,2008,39:271-281
|
被引
28
次
|
|
|
|
|
5.
Farrer E C. Litter drives ecosystem and plant community changes in cattail invasion.
Ecological Applications,2009,19(2):398-412
|
被引
7
次
|
|
|
|
|
6.
马文翰. 贵州喀斯特脆弱生态环境的可持续发展.
贵州师范大学学报,2003,21(2):75-77
|
被引
3
次
|
|
|
|
|
7.
蒋忠诚. 论岩溶峰丛洼地石漠化的综合治理技术——以广西平果果化示范区为例.
中国岩溶,2008,27(1):50-55
|
被引
21
次
|
|
|
|
|
8.
魏鲁明. 茂兰喀斯特森林凋落物量的动态研究.
南京林业大学学报自然科学版,2009,33(3):31-34
|
被引
12
次
|
|
|
|
|
9.
朱双燕. 桂西北喀斯特次生林凋落物养分归还特征.
生态环境学报,2009,18(1):274-279
|
被引
16
次
|
|
|
|
|
10.
Elser J J. Organism size, life history, and N: P stoiehiometry: towards a unied view of cellular and ecosystem processes.
Bioscience,1996,46:674-684
|
被引
202
次
|
|
|
|
|
11.
陈志辉. 喀斯特环境移民迁出区植物多样性研究.
中国生态农业学报,2008,16(3):723-727
|
被引
15
次
|
|
|
|
|
12.
谭卫宁. 广西木论国家级自然保护区兰科植物资源状况及其特点.
林业调查规划,2008,33(6):75-80
|
被引
5
次
|
|
|
|
|
13.
陈庆城(译).
植物群落-植物群落生态学教程,1981:13-301
|
被引
1
次
|
|
|
|
|
14.
Redfield A. The biological control of chemical factors in the environment.
Science,1958,46:205-221
|
被引
3
次
|
|
|
|
|
15.
Jackson R B. A global budget for fine root biomass, surface area, and nutrient contents.
Proceedings of the National Academy of Science (USA),1997,94:7362-7366
|
被引
217
次
|
|
|
|
|
16.
Mcgroddy M E. Scaling of c:n:p stoichiometry in forests worldwide: implications of terrwstrial redfield-type ratios.
Ecology,2004,85(9):2390-2401
|
被引
266
次
|
|
|
|
|
17.
Elser J J. Biological stoichiometry from genes to ecosystems.
Ecology Letters,2000,3:540-550
|
被引
428
次
|
|
|
|
|
18.
Zhou G Y. Old-Growth Forests can Accumulate Carbon in Soils.
Science,2006,314:1417
|
被引
104
次
|
|
|
|
|
19.
Luyssaert S. Old-Growth Forests as Global Carbon Sinks.
Nature,2008,455:213-215
|
被引
93
次
|
|
|
|
|
20.
Magill A H. Dissolved organic carbon and nitrogen relationships in forest.
Soil Biology & Biochemistry,2000,32:603-613
|
被引
37
次
|
|
|
|
|
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