基于林龄的滨海盐碱地杨树刺槐混交林土壤理化性质及草本植物多样性动态

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 基于林龄的滨海盐碱地杨树刺槐混交林土壤理化性质及草本植物多样性动态 DOI: 10.5846/stxb201801220172 作者: 作者单位: 山东农业大学,山东农业大学,滨州学院,山东农业大学,山东省黄河三角洲农业高新技术产业示范区管理委员会 作者简介: 通讯作者: 中图分类号: S725.1 基金项目: 国家自然科学基金项目（31770668）；山东省重大科技创新工程（2017CXGC0316）；山东省重点研发计划（2015GNC111026） Soil physiochemical properties and diversity of herbaceous plants dynamic on the different ages mixed forests of Populus×Euramercana ‘Neva’ and Robinia pseucdoacacia in coastal saline-alkali area Author: Affiliation: Shandong Agricultural University, Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:以黄河三角洲滨海盐碱地不同林龄的杨树（Populus×Euramercana ‘Neva’）、刺槐（Robinia pseucdoacacia）人工混交林及相应的纯林为研究对象，采用空间代时间的方法，研究了其不同林龄人工林林下植被特征与土壤理化性质变化。结果表明：（1）白茅（Imperata cylindrica）、猪毛菜（Salsola collina）、刺儿菜（Cirsium setosum）是滨海盐碱地人工林林下群落的优势种。（2）随着林分年龄（3年、7年、18年）的增加，杨树刺槐混交林及相应纯林Patrick指数及Margalef指数、Shannon-Wiener指数、Simpson指数及Pielou指数均表现出低-高-低的变化趋势，7年生时丰富度、草本多样性、均匀度最高。（3）杨树刺槐混交提高了林下草本物种组成及重要值，就纯林而言，刺槐林下植被物种多样性显著高于同龄杨树。（4）随着林龄的增大，杨树刺槐混交林及其纯林林下土壤pH值逐渐降低，杨树刺槐纯林土壤含盐量先增后减，杨树×刺槐混交林土壤含盐量依次递减；杨树刺槐混交林及其纯林林下土壤全磷含量呈先增加后减小趋势；杨树纯林及杨树×刺槐混交林全氮含量呈先减小后增加的趋势，刺槐纯林林下土壤全氮量呈连续增长的趋势；林龄间土壤pH、含盐量、全氮及全磷含量差异显著。（5）草本植物多样性相关指数与土壤含盐量呈极显著负相关，与土壤全磷量呈极显著正相关。 Abstract:Using the variable of spatial instead of time, the dynamics of soil physiochemical properties and undergrowth vegetation characteristics of Populus×Euramercana ‘Neva’ and Robinia pseucdoacacia artificial mixed and the corresponding pure forests in different ages in the coastal saline-alkali area of the Yellow River Delta were addressed in this research. The results showed that:(1) Imperata cylindrica, Salsola collina, and Cirsium setosum were the dominant species in the undergrowth community of plantations. (2) With increasing plantation ages (3 a, 7 a, and 18 a), the Patrick index, Margalef index, Shannon-Wiener index, Simpson index, and Pielou index of Populus×Euramercana ‘Neva’ and Robinia pseucdoacacia artificial mixed forests and their pure forests appeared a low-high-low variation trend; 7 a artificial forests had the highest richness, uniformity, and diversity of herbs. (3) Populus×Euramercana ‘Neva’ and Robinia pseucdoacacia mixed forest had more species of understory herbs and higher importance values. As far as pure forests are concerned, the species diversity of the understory vegetation of the Robinia pseucdoacacia forest was significantly higher than that of the Populus×Euramercana ‘Neva’ forest. (4) With stand age increased, the soil pH value of mixed and the corresponding pure forests decreased gradually. The soil salinity of pure forests increased first and then decreased, and that of the mixed forests decreased gradually. The total phosphorus content of mixed and the corresponding pure forests first increased and then decreased. The total nitrogen content of the Populus×Euramercana ‘Neva’ pure and mixed forests first decreased and then increased. Soil total nitrogen content in the Robinia pseucdoacacia pure forests exhibited a continuously increasing trend. Soil pH value, salinity, total nitrogen, and total phosphorus among the three age stands were significantly different. (5) There was a significant negative correlation between the index of herbaceous diversity and soil salinity, and a significant positive correlation with soil total phosphorus. 参考文献 相似文献 引证文献