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DOI | 10.2989/10220119.2018.1508071 |
Growth in three Karoo shrub species under various grazing treatments: the tracking of marked individuals over 25 years | |
van der Merwe, Helga1,2; Milton, Suzanne J.1,3 | |
发表日期 | 2019 |
ISSN | 1022-0119 |
EISSN | 1727-9380 |
卷号 | 36期号:1页码:61-66 |
英文摘要 | Growth studies of long-lived shrubs are uncommon. In semi-arid rangelands, livestock and wildlife grazing influence growth processes and may interact with changing climate. Tierberg-LTER, excluded from livestock since 1987, and two adjacent ranches allowed for a comparative growth study of three shrub species (Osteospermum sinuatum - palatable, Pteronia empetrifolia - moderately palatable, and P. pallens - unpalatable) across contrasting present ungulate herbivory (none in exclosures, wildlife only, or livestock and wildlife combined) and past livestock herbivory (moderate and overgrazed). Marked individuals were measured at irregular intervals over 25 years. Stem basal diameter (mm), height (m) and two canopy diameters (m) were measured at the onset of the study and in 2014. Mean basal diameter growth (mm y(-1)) varied between species and treatments. Change in mean attribute values was influenced by interactions with grazing history and treatments. Some historical and grazing treatments had a negative effect on the palatable O. sinuatum and no significant effect on moderately palatable P. empetrifolia or unpalatable P. pallens. The age of the originally marked individuals are unknown but >70% of these individuals survived over the 25-year period. Our results support previous findings that dwarf shrubs in deserts are slow growing and long lived, and that grazing regime affects plant growth. |
WOS研究方向 | Environmental Sciences & Ecology |
来源期刊 | AFRICAN JOURNAL OF RANGE & FORAGE SCIENCE |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/91892 |
作者单位 | 1.South African Environm Observat Network SAEON Ari, Kimberley, South Africa; 2.Univ Cape Town, Plant Conservat Unit, Cape Town, South Africa; 3.Univ Cape Town, Dept Biol Sci, FitzPatrick Inst African Ornithol, DST NRF Ctr Excellence, Cape Town, South Africa |
推荐引用方式 GB/T 7714 | van der Merwe, Helga,Milton, Suzanne J.. Growth in three Karoo shrub species under various grazing treatments: the tracking of marked individuals over 25 years[J],2019,36(1):61-66. |
APA | van der Merwe, Helga,&Milton, Suzanne J..(2019).Growth in three Karoo shrub species under various grazing treatments: the tracking of marked individuals over 25 years.AFRICAN JOURNAL OF RANGE & FORAGE SCIENCE,36(1),61-66. |
MLA | van der Merwe, Helga,et al."Growth in three Karoo shrub species under various grazing treatments: the tracking of marked individuals over 25 years".AFRICAN JOURNAL OF RANGE & FORAGE SCIENCE 36.1(2019):61-66. |
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