secondary forest ecosystem; forest ecosystem management; functional promotion; efficient utilization of non-wood resources
The secondary forest or second-growth forest, originated from natural regeneration after the destructive disturbances of original forests induced by human beings (e.g., long-term and large-scale logging) or by natural extreme events, has become the major forest resource worldwide. Since the flood disasters happened in the Yangtze River and Nen River in 1998, the Chinese government began to realize the importance of natural forests and started to implement the Natural Forest Conservation Project. A more rigorous protection measure of comprehensive ban on commercial logging in natural forests was implemented in 2016. As a result, the forest farmers, whose main business was timber harvesting, are facing unemployment. In such context, the new requirements for scientific research work have been put forward to indicate how to protect and restore the existing secondary forest ecosystem, and how to make rational use of existing forest resources and promote the economic transformation in forest regions. Since its establishment in 2003, Qingyuan Forest CERN (Qingyuan Forest) of Chinese Academy of Sciences has been conducting the long-term monitoring of the ecological elements (including water, soil, atmosphere, and biotic factors), the basic researches on forest ecology and silviculture, as well as the applied researches on the conservation and restoration of the temperate secondary forest ecosystem and efficient utilization of non-wood resources by experimental demonstration and technology promotion. All of these important progresses have provided scientific and technological support for the ecological conservation, restoration, and sustainable development of forests in Northeast China. Significant research achievements include the precision quantification technology/method of forest stand/gap structure, and the development of the technologies for the restoration of secondary forests and the cultivation of Panax ginseng under forest canopy based on the regulation principle of vertically stratified structure of forest stands, the clarification of the natural disturbance processes and its ecological significance, and the development of the techniques for promoting the restoration of secondary forest ecosystems and cultivation and utilization of Chinese herbal medicine under forest canopy by simulating natural disturbance (e.g., forming forest gaps). The researchers in Qingyuan Forest also revealed the coexistence mechanism of dominant tree species in secondary forests and applied it to the techniques of promoting forest gap regeneration and cultivation of wild vegetables under forest canopy. They also indicated the mechanism of forest litter for maintaining productivity of larch plantations in the secondary forest ecosystem, and developed measures for improving water conservation function of the forest ecosystem, and increased the survival rate of Rana chensinensis breeding under the forest canopy. The above progresses have provided the basic theory and technical support for ecological security construction and protection, restoration of resource capacity and efficient utilization of resources in temperate forests. These research and extension activities have made Qingyuan Forest an important platform to carry out the cooperative researches at home and abroad and a center for generating and transferring scientific knowledge for forest restoration and sustainable management in temperate forest ecosystems.
Bulletin of Chinese Academy of Sciences
朱教君, 刘世荣.次生林概念与生态干扰度.生态学杂志, 2007, 26(7):1085-1093.
Zhu J J, Matsuzaki T, Gonda Y. Optical stratification porosity as a measure of vertical canopy structure in a Japanese pine coastal forest. Forest Ecology and Management, 2003, 173(1-3):89-104.
Hu L L, Gong Z W, Li J S, et al. Estimation of canopy gap size and gap shape using a hemispherical photograph. Trees-Structure and Function, 2009, 23(5):1101-1108.
Hu L L, Zhu J J. Determination of canopy gap tridimensional profiles using two hemispherical photographs. Agricultural and Forest Meteorology, 2009, 149(5):862-872.
Zhu J J, Zhang G Q, Wang G G, et al. On the size of forest gaps:can their lower and upper limits be objectively defined? Agriculture and Forest Meteorology, 2015, 213(2):64-76.
Hu L L, Zhu J J. Improving gap light index (GLI) to quickly calculate gap coordinates. Canadian Journal of Forest Research, 2008, 38(9):2337-2347.
Zhu J J, Li X F, Liu Z G, et al. Factors affecting the snow/wind induced damage of a montane secondary forest in Northeastern China. Silva Fennica, 2006, 40(1):37-51.
Li X F, Jin L, Zhu J J, et al. Response of species and stand types to snow/wind damage in a temperate secondary forest, Northeast China. Journal of Forestry Research, 2017, https://doi.org/10.1007/s11676-017-0446-z.
Zhu J J, Mao Z H, Hu L L, et al. Plant diversity of secondary forests in response to anthropogenic disturbance levels in montane regions of northeastern China. Journal of Forest Research, 2007, 12(6):403-416.
Zhu C Y, Zhu J J, Zheng X, et al. Comparison of gap formation and distribution pattern induced by wind/snowstorm and flood in a temperate secondary forest ecosystem, Northeast China. Silva Fennica, 2017, 51:7693.
Lu D L, Zhu J J, Sun Y R, et al. Gap closure process by lateral extension growth of canopy trees and its effect on woody species regeneration in a temperate secondary forest, Northeast China. Silva Fennica, 2015, 49(5):1310.
朱教君, 刘世荣.森林干扰生态研究.北京:中国林业出版社, 2007.
Zhu J J, Matsuzaki T, Li F Q, et al. Effect of gap size created by thinning on seedling emergency, survival and establishment in a coastal pine forest. Forest Ecology and Management, 2003, 182(1-3):339-354.
Yan Q L, Zhu J J, Zhang J P, et al. Spatial distribution pattern of soil seed bank in canopy gaps of various sizes in temperate secondary forests, Northeast China. Plant and Soil, 2010, 329(1-2):469-480.
Zhang M, Zhu J J, Li M C, et al. Different light acclimation strategies of two coexisting tree species seedlings in a temperate secondary forest along five natural light levels. Forest Ecology and Management, 2013, 306(6):234-242.
Yang K, Shi W, Zhu J J. The impact of secondary forests conversion into larch plantations on soil chemical and microbiological properties. Plant and Soil, 2013, 368(1-2):535-546.
Gao T, Zhu J J, Zheng X, et al. Timber production assessment of a larch plantation:An integrated framework with fieldbased inventory, remote sensing data and forest management history. International Journal of Applied Earth Observation and Geoinformation, 2016, 52:155-165.
Yang K, Zhu J J, Yan Q L, et al. Changes in soil P chemistry as affected by conversion of natural secondary forests to larch plantations. Forest Ecology and Management, 2010, 260(3):422-428.
Yang K, Zhu J J. The effects of N and P additions on soil microbial properties in the paired stands of temperate secondary forests and adjacent larch plantations in Northeast China. Soil Biology & Biochemistry, 2015, 90:80-86.
Yan T, Lü X T, Zhu J J, et al. Changes in nitrogen and phosphorus cycling suggest a transition to phosphorus limitation with larch plantation stand development. Plant and Soil, 2017, https://doi.org/10.1007/s11104-017-3473-9.
Yan T, Zhu J J, Yang K, et al. Nutrient removal under different harvesting scenarios for larch plantations in northeast China:Implications for nutrient conservation and management. Forest Ecology and Management, 2017, 400:150-158.
Yang K, Zhu J J. Impact of tree litter decomposition on soil biochemical properties obtained from a temperate secondary forest in Northeast China. Journal of Soils and Sediments, 2015, 15(1):13-23.
Zhang W W, Lv Z T, Yang K, et al. Impacts of conversion from secondary forests to larch plantations on the structure and function of microbial communities. Applied Soil Ecology, 2017, 111:73-83.
Gang Q, Yan Q L, Zhu J J. Effects of thinning on early seed regeneration of two broadleaved tree species in larch plantations:implication for inducing pure larch plantations into larchbroadleaved mixed forests. Forestry, 2015, 88(5):573-585.
Yan Q L, Zhu J J, Gang Q, et al. Comparison of spatial distribution patterns of seed rain between larch plantations and adjacent secondary forests in Northeast China. Forest Science, 2016, 62:652-662.
Lu D L, Wang G G, Zhang J X, et al. Convert larch plantation to mixed forest:Effects of canopy treatment on the survival and growth of planted seedlings. Forest Ecology and Management, 2018, 409:19-28.
Wang J, Yan Q L, Yan T, et al. Rodent-mediated seed dispersal of Juglans mandshurica regulated by gap size and within-gap position in larch plantations:implication for converting pure larch plantations into larch-walnut mixed forests. Forest Ecology and Management, 2017, 404:205-213.
Zhu J J, Liu Z G, Wang H H, et al. Effects of site preparations on emergence and early establishment of Larix olgensis in montane regions of northeastern China. New Forest, 2008, 36(3):247-260.
Shang G D, Zhu J J, Gao T, et al. Using multi-source remote sensing data to classify Larch plantations in Northeast China and support the development of multi-purpose silviculture. Journal of Forestry Research, 2017, DOI:10.1007/s11676-017-0518-0.
Yan Q L, Zhu J J, Gang Q. Comparison of spatial patterns of soil seed banks between larch plantations and adjacent secondary forests in Northeast China:implication for spatial distribution mode of larch plantations. Trees-Structure and Function, 2013, 27(6):1747-1754.
Yan Q L, Gang Q, Zhu J J, et al. Variation in survival and growth strategies for seedlings of broadleaved tree species in response to thinning of larch plantations:implication for converting pure larch plantations into larch-broadleaved mixed forests. Environmental and Experimental Botany, 2016, 129:108-117.
Wang R Z, Xu T L, Yu L Z, et al. Effects of land use types on surface water quality across an anthropogenic disturbance gradient in the upper reach of the Hun River, Northeast China. Environmental Monitoring and Assessment, 2013, 185(5):4141-4151.
Jiaojun, ZHU; Qiaoling, YAN; Lizhong, YU; Jinxin, ZHANG; Kai, YANG; and Tian, GAO
"Support Ecological Restoration and Sustainable Management of Forests in Northeast China Based on Research of Forest Ecology and Demonstrations,"
Bulletin of Chinese Academy of Sciences (Chinese Version): Vol. 33
, Article 12.
Available at: https://bulletinofcas.researchcommons.org/journal/vol33/iss1/12