老挝过度采伐热带混合落叶林区的人工补植

来源 :林业研究(英文版) | 被引量 : 0次 | 上传用户:lurnay
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Enrichment planting is commonly used for increasing the density of desired tree species in secondary forests often characterized by a prevalence of low commercial species. The objectives of the study were to identify the optimal enrichment planting method vis-a-vis gap and line planting, and to evaluate the performance of two dipterocarps (Vatica cinerea and Dipterocarpus alatus) and three legumes (Afzelia xylocarpa,Pterocarpus macrocarpus, Dalbergia cochinchinensis) planted in logged-over mixed deciduous forest of Laos. The enrichment planting trial was arranged in a randomized complete block design with seven replications. Survival, height and diameter were measured seven years after planting and subjected to analysis of variance. Survival rate of planted seedlings did not vary between enrichment planting (p > 0.05). However,diameter and height growth was favored more in gaps than in planting lines. This was related to rapid canopy closure in both gaps and lines,albeit more remarkable in planting lines. Significant inter-species variation was detected for survival rate, height and diameter. The shade-tolerant dipterecarps had better survival and growth than the light-demanding leguminous species (p < 0.0001). The size class distribution of individuals was irregular, accentuating uneven light condition in the understory.Given the difficulty to maintain constant line width and even light condition, the cost of annual clean operation and the rigid geometric patterns of planting lines, the use of logged-over gaps for enrichment planting is recommended. Dipterocarpus alatus and V. cinerea are recommended for enrichment planting in mixed deciduous forests. A. xylocarpa, D. cochichinensis and P. macrocarpus can be planted in wider gaps, lines and open sites as plantation of mixed species or under canopy of young swidden forests.
其他文献
本刊讯(钟华报道)中国生活用纸行业面临产能严重过剩的局面,产品价格竞争将进入白炽化程度。在产品销价难以提高的情况下,若能通过改变原料结构,降低成本,将成为未来竞争的一大利
期刊
针对目前正压漏孔校准工作中存在的测量下限指标低、测量不确定度大等问题,提出了正压漏孔校准装置的优化设计方法.采用特殊设计,将定容室的容积减小到10 mL以下,降低了气体
通过对比试验研究了不同沙藏、库藏、袋藏和假植保存措施对葡萄苗其含水量、成活率、生长量、保存成本的影响.结果表明:沙藏处理的葡萄苗在同一保存存期内,根系、枝条含水量
利用磁控溅射技术在单晶硅P(111)、不锈钢表面分别制备了类金刚石(DLC)、CrN、TiN涂层.采用CSM球-盘摩擦磨损试验机,对比研究高接触应力下在甘油环境中三种涂层摩擦学性能,采
该文从挂篮荷载计算、施工流程、支座及临时固结施工、挂篮安装及试验、合拢段施工、模板制作安装、钢筋安装、混凝土的浇筑及养生、测量监控等方面人手,介绍了S226海滨大桥
期刊
坠安全器是施工升降机中最为重要的安全装置,它的性能好坏直接影响到施工人员的人身安全.文章分析SSD型钢丝绳式货用施工升降机瞬时式防坠安全钧的控制不足之处,针对断绳防坠
军用电子设备的维修是以更换电子集成模块为主,根据这一特点,通过分析处理电子设备的故障特征信息,把一种基于D-S证据理论的算法应用于故障特征信息的融合,从而实现故障电子模块
该文从挂篮荷载计算、施工流程、支座及临时固结施工、挂篮安装及试验、合拢段施工、模板制作安装、钢筋安装、混凝土的浇筑及养生、测量监控等方面人手,介绍了S226海滨大桥
期刊
该文从挂篮荷载计算、施工流程、支座及临时固结施工、挂篮安装及试验、合拢段施工、模板制作安装、钢筋安装、混凝土的浇筑及养生、测量监控等方面人手,介绍了S226海滨大桥
期刊