검색 상세

Comparison of Structural Characteristics among Different Types of Limestone Forests in Cat Ba Biosphere Reserve, Vietnam

초록/요약

Vietnam’s forests have long been known for their rich and diverse fauna and flora. However, the country has experienced significant deforestation and forest degradation due to human activities in the past decades. In response, various scientific works as well as technical solutions have been developed to reverse this trend. This study was conducted to assess the ecological characteristics of limestone forests with different management practices (no logging, post-selective logging, and post-clear-cut forests) and mixed plantations for the restoration and sustainable management of degraded natural limestone forests in the Cat Ba Biosphere Reserve, Vietnam. Structural characteristics of overstory as well as understory were investigated and then evaluated. The results showed that post-selective logging and post-clear-cut forests had much less number of tree species than no-logging forests. Several poor forest stands showed that the natural restoration of degraded limestone forests to the level of unimpacted primeval state could be very slow, or nearly impossible. Mixed plantations showed better signs of reasonable growth, the presence of various valuable species as well as higher biodiversity index than the naturally regenerated post-logged forests, and were nearly comparable to the no logged forest. Some limitation still existed in enrichment planting, such as high planting density and lower soil fertility than no-logged forests. These findings implied that further silvicultural and ecological techniques should be developed to improve the existing models as well as to be the basis for future measures in similar sites.

more

목차

Chapter 1. General Introduction 1
1.1. Study Background 1
1.2. Objectives 2
Chapter 2. Literature review 3
2.1. Structural characteristics of natural limestone forests 3
2.2. Natural regeneration in natural limestone forests 5
2.3. Restoration of degraded natural limestone forests 6
Chapter 3. Materials and Methodology 8
3.1 Study area 8
3.2 Methodology 10
3.2.1. Field inventory 10
3.2.2. Data analysis 15
Chapter 4. Results and Discussion 19
4.1. Structural characteristics of some typical natural forest types 19
4.1.1. Species composition and growth characteristics of the overstory in natural limestone forest 19
4.1.2. Natural regeneration, shrubs and herbaceous layer characteristics in natural limestone forests 31
4.2. Assessing some restoration models for degraded natural limestone forest 38
4.2.1. Species composition and growth characteristics of overstory layer in the restoration models 38
4.2.2. Natural regeneration, shrubs and herbaceous layer characteristics in restoration models 46
4.3. Comparison of soil properties in the secondary forest and the mixed plantation 53
Chapter 5. Conclusion 56
References 58

more
반출 Meta View 목록