Knowledge Resource Center for Ecological Environment in Arid Area
| 植被生产力与植物克隆性的样带分析 | |
| 其他题名 | Transect analysis of vegetation productivity in relation to plant clonality |
| 李仁强 | |
| 出版年 | 2007 |
| 学位类型 | 博士 |
| 导师 | 董鸣 |
| 学位授予单位 | 中国科学院植物研究所 |
| 中文摘要 | 克隆植物存在于自然界几乎所有类型生态系统，在群落和生态系统中起着重要作用。作为植物群落的重要组分，克隆植物势必深刻地影响群落的结构和功能。揭示克隆植物在不同类型生态系统中的重要性及其与环境因子的关系是克隆植物生态学研究的重要内容。\n本研究以东北样带为平台，通过采用野外植物和土壤调查，结合2006年23期500 m MODIS NDVI数据，重点分析环境因素和群落生产力与克隆植物丰富度和重要性的关系。主要结论如下：\n1．沿东北样带自西向东的不同植被类型中，克隆植物出现的频率和重要值呈现降低的趋势，具体体现为：典型草原 > 荒漠草原 > 草甸草原 > 农田 > 森林。克隆植物丰富度、重要值和相对物种数均与海拔呈显著相关，但这种关系随克隆构型发生变化。\n2．群落中克隆植物物种丰富度与土壤有机碳、全氮和全磷均有显著的相关关系，但与全钾并不呈现显著相关关系。通径分析表明，在三种草原植被中，土壤成分对克隆植物重要性的影响强度随草原类型变化而变化。\n3．植被生产力与年均降水量和年均日照时数显著相关；虽然植被生产力与年均温度没有显著的相关性，但与温度季节性变化呈显著相关；植被生产力与降水和温度季节性的相关性随植被类型发生变化。\n4. 就整个东北样带而言，植被生产力与群落中总的物种丰富度和克隆植物丰富度呈显著正相关，但与不同克隆构型克隆植物的丰富度相关关系不一致。在不同植被类型中，生产力与克隆植物丰富度没有相关关系，但与克隆植物重要值呈现不同相关关系。具体而言，克隆植物重要值与植被生产力的相关性在荒漠草原表现为正相关，在典型草原和草甸草原呈负相关，而在农田和森林没有显著相关性。\n在土壤环境相对贫瘠和植被生产力水平较低的条件下，克隆植物可能比非克隆植物具有更强的适应能力，并在群落次生演替过程中起重要作用。在高海拔、养分贫瘠的群落中，克隆植物出现频率较高。在荒漠草原，由于土壤贫瘠、扰动频繁，因此克隆植物在群落中的重要性较高，在生产力水平高的植物群落中克隆植物重要性较高；在典型草原和草甸草原，由于土壤养分等条件的改善，克隆植物在群落中的重要性降低，在生产力水平高的植物群落中克隆植物重要性较低；在农田和森林群落中，环境质量最好，克隆植物在群落中的重要性低，对群落的结构和生产力不构成显著影响，因此克隆植物重要性与生产力相关性不显著。 |
| 英文摘要 | Clonal plants extensively occur in almost all ecosystems, playing significant roles in successional processes of communities and ecosystems. As important components in plant communities, they may affect community structure and functioning. Studies on relationships among the importance value (IV)，primary productivity and other environmental factors are important fields in plant ecology. \n The Northeast China Transect (NECT) provides a unique opportunity to explore these relationships due to its regional environmental gradients. We combined plant and soil field data with 500 m MODIS NDVI to examine these relationships. Our results are as follows：\n 1. Among different NECT vegetation types, there was a tendency for the occurrence and IV of clonal plants to decrease in the following pattern: typical steppe > desert steppe > meadow steppe > farmlands > mixed forests. The species richness, IV and relative richness of clonal plants were all significantly related to elevation, and different clonal architectures had varied responses to elevation.\n 2. In NECT, the IV and species richness of clonal plants were positively related to the soil organic carbon, total nitrogen, and total phosphorus, but not related to total kalium. Path analyses indicated that different soil components had different degrees of influence on the IV of clonal plants. \n3. In NECT, the average precipitation and sunlight houses were significantly associated with vegetation productivity, while the average temperature was not significantly related to vegetation productivity. In different vegetation types, vegetataion productivity had different responses to the seasonality of precipitation and temperature. \n4. In NECT, vegetation productivity was related to the richness of total species and clonal plants, and had different relationships with different growth types of clonal plants. Within each vegetation type, vegetation productivity was not significantly related to species richness, but had different relationships with the IV of clonal plants. The IV of clonal plants and vegetation productivity had a positive relationship in desert steppe, negative relationships in typical steppe and meadow steppe, and no relationship in farmlands and forests.\nOur results suggest that clonal plants may have the stronger acclimation ability compared with non-clonal plants, and play the vital role in the secondary successional processes of communities. Clonal growth derives from the adaptation to different environments. The occurrence of clonal plants was more frequent in higher altitudes, more barren soils, and in early and middle stages of successional processes. IVs of clonal plants increase with vegetation productivity in desert steppe because of relative barren soils and rigorous habitats, while in typical and meadow steppes, IVs decrease with vegetation productivity due to meliorative habitats. In farmlands and forests, clonal plants have no impacts on the structure and productivity of vegetation, therefore their IVs are very low due to the good habitat condition. |
| 中文关键词 | 克隆植物 ; 土壤环境 ; 植被生产力 ; MODIS ; 重要值 ; 东北样带 |
| 英文关键词 | Clonal plants soil environments vegetation productivity MODIS importance value NECT |
| 语种 | 中文 |
| 国家 | 中国 |
| 来源学科分类 | 生态学 |
| 来源机构 | 中国科学院植物研究所 |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/286611 |
| 推荐引用方式 GB/T 7714 | 李仁强. 植被生产力与植物克隆性的样带分析[D]. 中国科学院植物研究所,2007. |
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