DOI: 10.1016/j.foreco.2017.03.017
Scopus记录号: 2-s2.0-85016456068
论文题名: Effects of climate on competitive dynamics in mixed conifer forests of the Sierra Nevada
作者: Johnson C. ; Chhin S. ; Zhang J.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2017
卷: 394 起始页码: 1
结束页码: 12
语种: 英语
英文关键词: Climate
; Competition
; Dendrochronology
; Mixed conifer
; Pinus lambertiana
; Pinus ponderosa
; Sierra Nevada
Scopus关键词: Competition
; Cooling systems
; Climate
; Dendrochronology
; Mixed conifer
; Pinus lambertiana
; Pinus ponderosa
; Sierra Nevada
; Forestry
; Abies concolor
; Calocedrus decurrens
; Coniferophyta
; Pinus lambertiana
; Pinus ponderosa
英文摘要: Trees in more competitive environments appear to respond to climate differently than trees in less competitive environments. In turn, climate patterns may affect inter- or intra-specific competition, favoring certain individuals over others. Using dendrochronological methods, we sampled cores from dominant pine trees and their nearby competitors in 40 stands in the northern Sierra Nevada. Our dendroclimatological analyses showed complex responses to climate for the dominant pine and their competitors. Pinus lambertiana Dougl. and Pinus ponderosa Dougl. Ex P. & C. Laws benefited from cooler temperatures in the past May; all species benefited from warmer winter temperatures; Calocedrus decurrens (Torr.) Florin benefited from cooler temperatures in the past summer, while Abies concolor (Gord. & Glend.) Lindl.) and the two pine species benefited from cooler temperatures in the present summer. All species showed consistently positive effects from increased precipitation and increased moisture availability. A competition ratio calculated as the ratio between the dominant tree's radial increments to the competitor's indicated that climate could influence competition through one of two mechanisms. One, negative responses to climate conditions that were negative for one species but neutral for another tended to drive the competition ratios. Two, conditions that were negative for both competing trees tended to hurt competitors more than dominant trees, while conditions that were generally positive tended to help competitors more than dominant trees. These results suggest that the dominant pine trees may be more resilient to climate stress than competitors. Reducing competition via management such as thinning may increase climatic resilience for all species and possibly have positive competitive results for competitors. Increasing temperatures will tend to harm Sierra Nevada conifers in the summer and spring, but may show some benefit over the winter as long as precipitation is not reduced. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64357
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Forestry, Michigan State University, Natural Resources Building, 480 Wilson Road, Room 126, East Lansing, MI, United States; USDA Forest Service, Pacific Southwest Research Station, 3644 Avtech Parkway, Redding, CA, United States
Recommended Citation:
Johnson C.,Chhin S.,Zhang J.. Effects of climate on competitive dynamics in mixed conifer forests of the Sierra Nevada[J]. Forest Ecology and Management,2017-01-01,394