The effect of single-tree selction system on soil properties in an oriental beech stand of Hyrcanian

来源 :Journal of Forestry Research | 被引量 : 0次 | 上传用户:intaaad
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
A case study was conducted in beech forests of northern Iran to determine the effect of the created gaps on some soil properties in beech stand. Changes of soil properties in small (60 150 m 2 ), medium (151 241 m 2 ), large (242 332 m 2 ) and very large (333 550 m 2 ) gaps, as well as under closed stands were studied eight years after the gap creation. Soil samples were taken from three depths, 0 10, 10 20 and 20 30 cm. The gaps were different from their around undisturbed stands in terms of the following soil parameters: Mg +2 concentration of 0 10 cm at medium gap size, bulk density of 10 20 cm at very large gap size as well as K + and Ca +2 concentrations at 20 30 cm at small and large gap sizes, respectively. Furthermore, the size of the gaps had no effect on soil characteristics through the whole profile. Water saturation percent (Sp %) at 0 10cm as well as P and Mg +2 at 20 30 cm was different amongst undisturbed stands around different gap sizes. The center and the edges of the gap were different only in terms of organic carbon at the depth of 10 20 cm. Significant differences were observed between gaps andclosed canopy regarding P and Ca +2 at depth 0 10 cm and 10 20 cm, respectively. It can be concluded that applied silvicultural system for harvesting trees which created these gaps might be suitable for conservation and forest management in the region. A case study was conducted in beech forests of northern Iran to determine the effect of the created gaps on some soil properties in beech stand. Changes in soil properties in small (60 150 m 2), medium (151 241 m 2), large ( 242 332 m 2) and very large (333 550 m 2) gaps, as well as under closed stands were studied eight years after the gap creation. Soil samples were taken from three depths, 0 10, 10 20 and 20 30 cm. gaps were different from their around undisturbed stands in terms of the following soil parameters: Mg +2 concentration of 0 10 cm at medium gap size, bulk density of 10 20 cm at very large gap size as well as K + and Ca + 2 concentrations at 20 30 cm at small and large gap sizes, respectively. The size of the gaps had no effect on soil characteristics through the whole profile. Water saturation percent (Sp%) at 0 10cm as well as P and Mg +2 at 20 30 cm was different amongst undisturbed stands around different gap sizes. The center and the edges of the gap were different only in terms of organic carbon at the depth of 10 20 cm. respectively. Significant differences were observed between gaps andclosed canopy regarding P and Ca +2 at depth 0 10 cm and 10 20 cm, respectively. It can be concluded that applied silvicultural system for harvesting trees which created these gaps might be suitable for conservation and forest management in the region.
其他文献
稳像算法的研究对实现电子稳像有重要的作用。介绍了车载电子稳像技术的基本概念、原理以及常用的典型算法,给出了一种典型的电子稳像系统,结合车载摄像系统成像的特点,选用
利用造纸废水处理厂3种污泥,以5%的加入量分别配抄160g·m-2箱纸板。结果表明:曝气池好氧活性污泥最佳,添加好氧活性污泥的纸板可以获得比原浆更高的环压指数和裂断长;且对浆
海水淡化技术在不断地发展,从传统的蒸馏法到目前的膜处理.真空蒸馏处理技术(VDT)是在烘干处理技术基础上的发展,应用在船舶上,利用船舶的废热来淡化海水的一项技术,分析了原
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
随着人们对居住要求的提高,软装饰设计在室内设计中越来越受欢迎.软装饰设计是一种针对目前家庭装潢中盲目追来豪华现象提出的健康家装新时尚.室内界面装修完毕之后,利用那些
总结成绩,正视问题,充分认识天保工程建设面临的新形势从1998年开始试点到现在天保工程的实施已经整整5年了。这5年里,天保工程区发生了很大变化,整个林业发展的形势也发生
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
对13个桉树无性系进行造林试验,结果表明:不同无性系之间在树高、胸径、单株材积等存在极显著差异;最优无性系C10的单株材积为0.909 2m~3,是最差无性系(C7)的21.2倍,是群体均
据报道,深圳对于城市更新的依赖性在去年已经高达75%,但其城市更新进程长期处于“拆不动、赔不起、玩不转”的困境中。缘于此,8月初,正在内部征集意见的深圳《城市更新条例(草案稿
改变传统的基于PCI插槽的图象卡加摄像头的图象采集模式,介绍了利用CY7C68013和OV9620芯片开发数字摄像系统的设计方案。重点阐述了WDM模式的USB设备驱动程序与采集视频流的