Comparative analysis of annual rings of perennial forbs in the Loess Plateau,China |
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| Institution: | 1. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;2. University of the Chinese Academy of Sciences, Beijing 100049, China;3. College of Forestry, Northeast Forestry University, Harbin 150040, China;1. College of Agronomy, Northwest A&F University, Yangling 712100, Shaanxi, China;2. College of Forestry, Northwest A&F University, Yangling 712100, Shaanxi, China;3. Eastern Cereal and Oilseed Research Centre, Agriculture and Agri-Food Canada, 960 Carling Ave., Ottawa, Ontario K1A OC6, Canada;1. Chinese Institute of Water-Saving Agriculture, Northwest A&F University, Yangling 712100, Shaanxi, China;2. Key Laboratory of Crop Physi-Ecology and Tillage Science in Northwestern Loess Plateau, Minister of Agriculture, Northwest A&F University, Yangling 712100, Shaanxi, China;1. School of Materials and Energy, Guangdong University of Technology, Guangzhou Higher Education Mega Center 100#, Guangzhou, 510006, China;2. Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter, Guangzhou, 510006, China;3. Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou, 510640, China;1. Yunnan Provincial Key Laboratory of Panax notoginseng, Faculty of Life Science and Technology, Kunming University of Science and Technology, Jingming South Road, Kunming, 650500, China;2. UWA School of Agriculture and Environment, Faculty of Science, The University of Western Australia, 35 Stirling Highway, Perth, WA, 6009, Australia;3. Faculty of Architecture and City Planning, Kunming University of Science and Technology, Jingming South Road, Kunming, 650500, China;4. Vegetable Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou, 501640, China;5. Yunnan Rural Science and Technology Service Center, Kunming, 650021, China;1. State Key Laboratory of Crop Stress Biology in Arid Areas, Northwest Agricultural and Forestry University, Yangling 712100, Shaanxi, China;2. Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture/College of Natural Resources and Environment, Northwest Agricultural and Forestry University, Yangling 712100, Shaanxi, China;3. Department of Renewable Resources, University of Alberta, Edmonton, Alberta, Canada |
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| Abstract: | Although recent studies have demonstrated that annual growth rings are present among perennial forbs species at high northern latitudes, little is known about whether there are demarcated growth rings of perennial forbs in the Loess Plateau of China where plant growth is strongly limited by dry climate conditions and severe soil erosion. In this study, we collected the main roots of 11 perennial forbs species along the precipitation gradient in the Loess Plateau, and analyzed the growth rings in the secondary root xylem. We found that ten species showed distinct annual growth rings, and the anatomical patterns, including vessel size and density, varied considerably among different families. Our results suggest, for forbs species in the Loess Plateau, that vessel diameter in the root xylem was strongly correlated with growth rate of the forb’s roots. Ring widths of the forbs showed a significant declining trend, reflecting the deteriorating signal of growth condition with age. In comparison to other families, forb species of Fabaceae usually have the evidently larger vessels that link directly to higher hydraulic capacity and growth rate. In terms of annual ring width patterns, this study provides an applicable approach to detecting effects of limited climatic conditions and life history strategies on herbaceous vegetation in the Loess Plateau. |
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| Keywords: | Herb-chronology Anatomical patterns Secondary root xylem Permanent main root Growth rate Age distribution |
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