Characteristics in coarse woody debris mediated by forest developmental stage and latest disturbances in a natural secondary forest of Pinus tabulaeformis |
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| Institution: | 1. College of Forestry, Northwest A&F University, Yangling, Shaanxi 712100, China;2. Qinling National Forest Ecosystem Research Station, Huoditang, Ningshan, Shaanxi 711600, China;1. Key Laboratory for Silviculture and Conservation of the Ministry of Education, College of Forestry, Beijing Forestry University, No. 35, Qinghua East Road, Beijing 100083, PR China;2. National Energy R & D Center for Non-Food Biomass, Beijing Forestry University, No. 35, Qinghua East Road, Beijing 100083, PR China;3. National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, No. 35, Qinghua East Road, Beijing 100083, PR China;1. Zhejiang Forestry Academy, Hangzhou 310023, China;2. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;4. Qinghai Academy of Environmental Science, Xining 810007, China;5. Bureau of Science and Technology for Resource and Environment, Chinese Academy of Sciences, Beijing 100864, China;1. College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875, China;2. State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China;1. Key Laboratory of Grassland Ecosystem of Ministry of Education, Sino-U.S. Centers for Grazing land Ecosystem Sustainability, Pratacultural College, Gansu Agricultural University, Lanzhou, 730070 Gansu, China;2. Fodder and Forage Station of Xuanhan County, Xuanhan, 636150 Sichuan, China;1. Key Laboratory of Computational Geodynamics, Chinese Academy of Sciences, Beijing 100049, China;2. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Coarse woody debris (CWD) characteristics are expected to reflect forest stand features. Few studies evaluated logging-induced stand characteristics of secondary coniferous forests by quantifying the quality and quantity in CWD. After selective logging, the form of secondary forest of Pinus tabulaeformis in the Qinling Mountains is inferior and the regeneration is poor. We measured the CWD characteristics of the forest which had an average CWD biomass amount of 12.56 t hm−2, and was predominated by abundant logs (65.68%), followed by snags (33.13%). The CWD biomass of P. tabulaeformis and Toxicodendron vernicifluum was significantly higher than that of other species, which took up 85.51% of the total. Although there was no significant difference among different diameter sizes (P > 0.05), the CWD biomass of diameter 30–40 cm occupied 46.26% of the total (5.81 t hm−2). Similarly, the CWD biomass of decay class I and II accounted for 39.89% (5.01 t hm−2) and 33.04% (4.15 t hm−2) of the total CWD biomass respectively, despite no significant difference among those 5 decay classes (P > 0.05). The results indicated that the combination of young forest developmental stage caused by past selective logging and natural and anthropogenic disturbances such as strong wind, tapping lacquer, firewood collection, and illegal tree felling played a crucial role in distribution characteristics of CWD in this secondary forest of P. tabulaeformis. |
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| Keywords: | Qinling Mountains Coarse woody debris Biomass Forest management |
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