作 者 ：刘万德,苏建荣,李帅锋,张志钧,李忠文
期 刊 ：生态学报 2010年 30卷 23期 页码：6581~6590
Keywords:successional stages, correlation analysis, stoichiometry, monsoon evergreen broad-leaved forest,
摘 要 ：通过测定中国西南季风常绿阔叶林不同演替阶段（演替15a，演替30a及原始林）群落中植物叶片与土壤中C、N、P含量，探索了季风常绿阔叶林不同演替阶段群落C、N、P化学计量特征及其与物种丰富度及多度的相关性。结果表明：土壤及植物中全N、全P含量及土壤中C含量均为演替30a群落中最低，而植物中C含量在不同演替阶段群落间无显著性差异。在不同演替阶段共有种中，40%的物种N含量原始林中最高，40%的物种P含量演替15a群落中最高，而80%的物种C含量无显著性差异。土壤中C∶N比在不同演替阶段间无显著变化，而N∶P及C∶P比则随演替呈减小趋势。植物中C∶N及C∶P比均为演替30a群落最高，而N∶P比则随演替呈增加趋势。不同演替阶段共有种的C∶N比中，40%的物种原始林中最低，40%的物种无差异，而C∶P与N∶P比中则均有60%物种无显著性差异，但70%物种在演替15a群落中N∶P小于14，演替30a群落中50%物种N∶P在14—16，原始林中则有80%物种N∶P大于16。群落物种丰富度及个体多度均与C∶N、N∶P、C∶P无显著的相关性，但植物中的N、P与土壤的N、P分别具有显著的线性正相关，说明土壤中N、P供应量影响植物体中的N、P含量。
Abstract:One of the principal insights of Darwin′s theory of evolution by natural selection is the common descent of all organisms. Perhaps the strongest evidence for common descent is the shared underlying biochemistry based on nucleic acids, proteins, lipids, and other biomolecules. At the same time, natural selection has generated a plethora of morphologies, life history strategies and other differences that reflect variation in the way that organisms take up and transform energy and a variety of material elements. Ecological stoichiometry provides a framework for linking this variation with species interactions, food web dynamics, and nutrient cycling, and is a useful tool to study the effect of elemental composition of organisms on the nutrient cycling. Ecological stoichiometry is a complementary model of ecosystem functioning, potentially supplementing and extending insights from ecological energetics, which has been the dominant mode of biophysical analysis in ecology. Central to the stoichiometric application in ecology is realizing biological entities (such as molecules, organelles, cells, and organisms) varied considerably in terms of their elemental composition and these differences are fundamentally linked to important aspects of ecological functioning. Thus, the ways that organisms interact with each other and with their abiotic environment can be strongly and reciprocally influenced by the elemental requirements of organisms involved and the balance of chemical elements presented to them in their environment. In this study, we explored the relationship between the stoichiometry properties and the species diversity by testing C, N and P contents of plant and soil across three successional stages (15 years old (CF), 30 years old (CT), and primary forest (CP)) of monsoon evergreen broad-leaved forests in Southwest China. The results showed that N and P contents in the soil and plants as well as soil C content were the lowest in the CT, and there was no significant difference in C content in plants across three successional stages. The N content of 40% common species were the highest in CP, and P content of 40% common species were the highest in CF, while no significant difference were detected to C content of 80% common species. The N/P and C/P ratios in soil decreased with succession, while no significant difference existed for the C/N ratio in soil. The C/N and C/P ratios in plants were the highest in CT, and the N/P ratio in plants increased with succession well. The C/N ratio of 40% common species were the lowest in CP, while there were no significant difference for the C/P and N/P ratios of 60% common species in three successional stage. However, the N/P ratio of 70% common species in CF were lower than 14, and 50% common species in CT were 14-16, and 80% common species in CP were higher than 16. There were no significant correlations between species richness(or abundance) and C/N, N/P and C/P ratios. However, N and P content in plants were positively correlated with their contents in soil respectively. Our test finally indicated that N and P content in soil would affect N and P content in plants.
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