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Scientia Silvae Sinicae ›› 2022, Vol. 58 ›› Issue (8): 26-40.doi: 10.11707/j.1001-7488.20220804

• Research papers • Previous Articles     Next Articles

Development Mixed Forest with Community Structure is the Key Technologies to Maintain, Restore, and Improve the Functions of Forest Soil and to Achieve the Sustainable Management of Plantation

Chengdong Yang   

  1. Research Institute of Forestry, CAF Beijing 100091
  • Received:2022-05-20 Online:2022-08-25 Published:2022-12-19

Abstract:

Objective: To reveal the mechanism of soil quality degradation and forest tree growth decline caused by mono culture of single species especially single conifer species, and consecutive cropping and to illustrate the mechanism and technical approach of the development of mixed forest with community structure in maintaining, restoring and improving the functions of forest soil. Method: Based on many years of studies on conditions and mechanisms of soil quality degradation of major forest plantations in China and practices of degradation control, and on an extensive literature study, both home and abroad, paper in-depth explore advance of the soil quality degradation and prevention and treatment caused by domestic and foreign single tree pure forest management especially management of single species coniferous pure forest, continuous cropping. A comprehensive comparison of physical and chemical properties of soil and biological activities between the single conifer species forest and different stand types of the mixed forests under similar site conditions was conducted to reveal the mechanisms of soil degradation due to mono culture of single species especially single conifer species and consecutive cropping, and to illustrate the mechanisms of and technical approaches to maintaining, restoring and improving soil functions of mixed forest. Result: Under similar site conditions, the monoculture of single species forest especially single conifer speciesforest and consecutive cropping in comparison with different stand types of the mixed forests showed decreases in the amount of litter, the quality and quantity of soil organic matter, the contents of available phosphorus, exchangeable cation, pH value, soil biochemical activities, soil fertility and tree growth, as well as the increase of severity of diseases and pests. Alternative species, proportions and models for mixed forests is clearly illustrated for the development of mixed forests with main afforestation tree species, technical approaches to improve existing single species forest especially the single conifer species plantations with poor growth into mixed forest with community structure is thoroughly elaborated. Conclusion: The development of mixed forest with community structure is the key technology to maintain, restore and improve forest soil functions, to improve forest soil productivity and to achieve sustainable management of forest plantations.

Key words: coniferous forest, broad-leaved forest, mixed forest, soil quality, soil biochemical activity

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