Quantitative dynamics on stimulating regeneration and sowing seedlings ofLarix gmelinii in Daxing’an Mountains

Abstract

To understand the quantitative dynamics and death reason of stimulating regeneration seedlings is significant for stimulating the natural regeneration ofLarix gmelinii and implement of conservation project of natural forest. This paper summarized location observations and directly-seeding simulation experiments of six permanent sample plots that were set up after the seed bumper harvest year ofLarix gmelinii in 1989. The study showed that stimulating natural regeneration seedlings had a large mortality in the first three years, especially in the first year of seedling emergence. After three years seedlings died less and stepped into the stable regeneration stage. A large number of seedlings died of sunscald as the primary death reason. For those areas of good site conditions and rich soil, damping-off would cause seedlings to death in large quantities. The task of stimulating regeneration is mainly to get rid of the litter (forest floor) on burned areas. By means of promoting measures, emergence rate of sown seeds would be several times and dozens of times higher than that of seed shedding on the condition of retention of forest floor. Promoting the regeneration need to select the suitable site against great slope and low-lying lands; at the same time, be careful of the avoidance of frost heaving by depression water.

Keywords

Larix gmelinii / Larch / Stimulating natural regeneration / Seedlings / Burn area / Daxing’an Mountains

References

[1] Jianping Shan Relationship between Fruitage ofLarix gmelinii and its characteristics of long branches [J]. Chinese Journal of Ecology, 1990, 9(6): 20-23.

[2] Dali Tao, Zhenbang Xu, Xu Li Effect of litter layer on natural regeneration of companion free species in the Korean pine forest [J]. Environment and Experimental Botany, 1989, 27(1): 53-65.

[3] Duning Xiao, Wengui Shu Forest soils and their productive properties in the North Great Xingan Mountains [J]. Journal of Ecology, 1988, 7: 41-48.

[4] Zhenbang Xu et al. Fruitage ofLarix gmelinii in 1989 in Tuqiang Forestry Bureau Jurisdiction Area of the Greater Xingan Mountains [J]. Chinese Journal of Ecology, 1992, 11(3): 8-12.

[5] Zhenbang Xu et al. Fruitage ofLarix gmelinii and its relation to age structure of short branches [J]. Chin. J. Appl. Ecol., 1993, 4(3): 234-240.

[6] Zhenbang Xu et al. Germination condition of assistingLarix gmelinii natural regeneration [J]. Chin. J. Appl. Ecol., 1994, 5(2): 120-125.