不同水淹下狗牙根-牛鞭草混作对植株生物量的影响

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 不同水淹下狗牙根-牛鞭草混作对植株生物量的影响 DOI: 10.5846/stxb201606211206 作者: 作者单位: 三峡库区生态环境教育部重点实验室，重庆市三峡库区植物生态与资源重点实验室，西南大学生命科学学院，广西农业科学院农业资源与环境研究所,三峡库区生态环境教育部重点实验室，重庆市三峡库区植物生态与资源重点实验室，西南大学生命科学学院,三峡库区生态环境教育部重点实验室，重庆市三峡库区植物生态与资源重点实验室，西南大学生命科学学院,三峡库区生态环境教育部重点实验室，重庆市三峡库区植物生态与资源重点实验室，西南大学生命科学学院,三峡库区生态环境教育部重点实验室，重庆市三峡库区植物生态与资源重点实验室，西南大学生命科学学院,三峡库区生态环境教育部重点实验室，重庆市三峡库区植物生态与资源重点实验室，西南大学生命科学学院 重庆市地质矿产勘查开发局川东南地质大队 作者简介: 通讯作者: 中图分类号: 基金项目: 国家国际科技合作专项（2015DFA90900）；三峡后续工作库区生态与生物多样性保护专项项目（5000002013BB5200002）；重庆市林业重点科技攻关项目（渝林科研2015-6）；中央财政林业科技推广示范项目（渝林科推[2014-10]） Effects of mixed intercropping of Cynodon dactylon and Hemarthria altissima on their biomass under different flooding conditions Author: Affiliation: Key Laboratory of Eco-environment in the Three Gorges Reservoir Region ( Ministry of Education), Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region,School of Life Sciences,Southwest University, Agricultural Resources and Environment Research Institute, Guangxi Academy of Agricultural Sciences,,Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region,School of Life Sciences, Southwest University, Chongqing 400715, China,,,Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), School of Life Sciences, Southwest University 2Southeast Sichuan Geological Group，Chongqing Bureau of Geology and Minerals Exploration 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:了解狗牙根（Cynodon dactylon）和牛鞭草（Hemarthria altissima）在不同水淹地区较优的种植方式对退化湿地的植被修复具有重要意义。设置4种不同水分条件，即对照组（CK）、水淹与干旱交替组（FD）、土壤表面水淹组（FL）和全淹组（SM），4种不同的植株密度（每盆分别种植1，2，4株或12株）和2种不同的种植方式（单作和混作），研究两物种在不同水淹条件下以不同方式和密度种植时的生物量变化。结果表明，水分、种植密度和种植方式均显著影响两物种的地上生物量和总生物量（P < 0.05）。CK和FD条件下，以中、高密度混作的狗牙根地上生物量和总生物量与单作相比显著下降（P < 0.05），牛鞭草在混作方式下的生物量与单作相比有了一定提高，其中在高密度混作情况下其生物量得到显著提高（P < 0.05）。在FL条件下，与单作相比，中、低密度混作的狗牙根和牛鞭草生物量均具有一定的上升。全淹条件下以中、低密度混作对狗牙根地上生物量和总生物量具有显著的促进作用（P < 0.05），对牛鞭草无显著差异（P > 0.05），高密度混作方式则对两物种生物量均无显著影响（P > 0.05）。随着水淹程度的增加，混作对狗牙根产生的生长抑制影响逐渐减弱。在长期浅水淹的地区，采取中、低密度混作将更有利于牛鞭草和狗牙根的长期共存。在较低海拔的全淹地区，采取高密度的牛鞭草-狗牙根混作方式将是更为理想的选择。 Abstract:The water level fluctuation zone of the Three Gorges Reservoir has been affected by a number of ecological problems, most importantly, the loss of previous vegetation. The revegetation of this region is just one example of a potential solution to this issue, and revegetation projects have been carried out in the region over recent years in an attempt to restore the riparian ecosystem within the Three Gorges Reservoir region. The riparian species Hemarthria altissima and Cynodon dactylon have been commonly used in this revegetation effort. Knowledge of the growth responses of plant species to different flood regimes and identifying a suitable planting pattern will lead to improvements in the design of wetland management strategies. Therefore, the aim of this study was to determine the optimal planting pattern for these two species under different flood conditions. Four flooding conditions were designed using an independent-group design and their results were evaluated. These groups were the Control Group (CK), the Flooding-Dry Alternating Group (FD), the Soil-Flooding Group (FL), and the Submergence Group (SM). These groups had four different planting densities, which were 1, 2, 4, or 12 plants per experimental pot. Single cropping strategies were applied to the pot with one plant, while both single and mixed cropping strategies were applied to the pots with, 2, 4, and 12 plants. The ratio of H. altissima to C. dactylon in the mixed intercropping groups was 1:1 in the pots with 2, 4, and 12 plants. The results indicated that the total and aboveground biomasses of H. altissima and C. dactylon were significantly influenced by water treatment, planting density, and planting pattern (P < 0.05). The total and aboveground biomasses of C. dactylon significantly decreased in the mixed intercropping pots with medium and high planting densities under the CK and FD conditions (P < 0.05). In contrast, the total and aboveground biomasses of H. altissima increased in the mixed intercropping pots for all planting densities, and increased significantly at the high planting density under the CK and FD conditions (P < 0.05). The total H. altissima and C. Dactylon biomasses increased in the mixed intercropping pots with low and medium planting density under the FL treatment. The total and aboveground C. dactylon biomasses also significantly increased in the mixed intercropping pots with low and medium planting density under the SM treatment (P < 0.05). However, the mixed intercropping pattern with low and medium planting density did not influence the H. altissima biomass under the SM treatment (P > 0.05). Furthermore, the mixed intercropping pattern with high planting density did not influence the H. altissima and C. Dactylon biomasses under the SM treatment (P > 0.05). The inhibition influence of the mixed intercropping pattern to C. Dactylon declined as flooding stress increased. The results suggested that the long-term coexistence of H. altissima and C. Dactylon would improve if a mixed intercropping pattern with low and medium planting densities was adopted in areas where flooding lasted for a long period. Therefore, in order to strengthen the soil retention functions of H. altissima and C. dactylon, and improve the species diversity and community stability of the vegetation restoration, mixed intercropping with a high H. altissima-to-C. dactylon planting density is the optimal choice in low-altitude areas that are completely flooded. 参考文献 相似文献 引证文献