Knowledge Resource Center for Ecological Environment in Arid Area
| Intensive rotational targeted grazing (IRTG) as a management tool for Rosa multiflora | |
| LaBarge, Erin R. | |
| 出版年 | 2016 |
| 学位类型 | 硕士 |
| 导师 | Kleppel, Gary S. |
| 学位授予单位 | State University of New York at Albany |
| 英文摘要 | The efficacy of intensive rotational targeted grazing (IRTG) for suppression of the invasive shrub, multiflora rose (Rosa multiflora) was investigated in upstate New York. Sheep stocked at high density were rotated through a circuit of enclosures at a frequency of 3-d per enclosure, from May-September, 2011 and 2012. The photosynthetic surface areas (PSA) and vitality of R. multiflora plants were evaluated before (May 2011) and after treatment by grazing (Sept 2011). Changes over time were compared with similar measurements of ungrazed plants. Species richness (S) was estimated in each enclosure before (May) and after (September) treatment. PSA in grazed enclosures declined by 56.8% over the 2011 season and by 62.5% during the 2012 season. One year after ITRG treatment, healthy R. multiflora plants in grazed enclosures had declined by 91% and unhealthy and dead plants had increased by more than 200%. The distributions of healthy, unhealthy and dead plants, in grazed and ungrazed enclosures, though not different before treatment (chi square goodness of fit test; p>0.05 were different one year later (p<0.001). Mean S in grazed enclosures increased by 27% over the season and by the end of the study, S was 12% higher than ungrazed enclosures. Evidence of stress in R. multiflora (clumping, dwarfing and reddening of leaves) at the end of the 2011 season led me to investigate the possible presence of rose rosette disease (RRD) during 2012. Potential stress was confirmed in plants experiencing leaf reddening. Chlorophyll a concentrations were significantly lower in red than green leaves (Student’s t = 5.20, df=28, p<0.001). Not unexpectedly, Normalized Difference Vegetative Index (NDVI) lso differed in red and green leaves (Student’s t = 2.76, df=32, p<0.01). Green leaves had higher dry weights than red leaves (Student’s t=14.13, df=151, p<0.001). Wool from the sheep, and R. multiflora leaf and petiole samples were collected to determine if the eriophyid mite, Phyllocoptes fructiphilus, a vector for RRD was present. No significant evidence of P. fructiphilus in leaf and petiole (Mean=0.00 N=414 SD=.71) or wool samples (Mean=0.00 N=11 SD=0) was found. This was unexpected, although it would only take one mite to be the vector if that particular mite was carrying the rose rosette virus. Further studies would be required to test whether rose rosette was confirmed in this population. Visual evidence of RRD symptoms were more prevalent in grazed enclosures than ungrazed locations, and a greater decline in grazed enclosures was clear. |
| 英文关键词 | Grassland management Grazing Invasive species Landscape management Multiflora rose Rotational grazing |
| 语种 | 英语 |
| 国家 | United States |
| 来源学科分类 | Biology; Conservation |
| URL | https://pqdtopen.proquest.com/doc/1777348933.html?FMT=AI |
| 来源机构 | State University of New York |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/249840 |
| 推荐引用方式 GB/T 7714 | LaBarge, Erin R.. Intensive rotational targeted grazing (IRTG) as a management tool for Rosa multiflora[D]. State University of New York at Albany,2016. |
| 条目包含的文件 | 条目无相关文件。 | |||||
| 个性服务 |
| 推荐该条目 |
| 保存到收藏夹 |
| 导出为Endnote文件 |
| 谷歌学术 |
| 谷歌学术中相似的文章 |
| [LaBarge, Erin R.]的文章 |
| 百度学术 |
| 百度学术中相似的文章 |
| [LaBarge, Erin R.]的文章 |
| 必应学术 |
| 必应学术中相似的文章 |
| [LaBarge, Erin R.]的文章 |
| 相关权益政策 |
| 暂无数据 |
| 收藏/分享 |
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
