孟加拉国库克斯巴扎(Cox’s Bazar)和兰加马蒂(Rangamati)地区森林区和采伐区土壤属性比较

来源 :林业研究(英文版) | 被引量 : 0次 | 上传用户:feicuisenlinviolet
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
The study dealt with the assessment of impact of deforestation on soil through a comparative analysis of soil physicochemical properties of natural forest and deforested areas. Soil samples from three depths (top, middle and bottom) under natural forest and nearby deforested areas were collected to investigate soil properties. Forest soils show no significant change in particle size distribution. Bulk density of forested soils shows the significant differences in top and middle layers. Soil pH in top and middle soil, organic matter in top soil and available phosphorus in middle soil of the forest site are found to be significantly higher than that of the deforested soils. Forest soils also have significantly higher level of exchangeable Ca2+, K+ in top and middle soil and Mg2+ at all depth than those of deforested site. Exchangeable Na+ and cation exchange capacity (CEC) are observed unchanged in both sites. The results suggest that change in soil properties was more obvious in surface and sub surface portions of both areas. The study shows that deterioration of physicochemical properties occurred due to deforestation.
其他文献
由于高强度螺栓连接方式对被连接件制作具有连接方便、经济可靠等优点,被广泛应用于中小型塔式起重机的塔身连接上.本文结合高强度螺栓的性能特点、性能及计算就塔机标准节连
Forest ecosystem services contribute to human welfare, both directly and indirectly. Here the economic value of water conservation by Bazoft basin located in Za
CH4 is one of the most important greenhouse gases, and mainly comes from soils in forest ecosystems. The objective of this study was to determine the effects of
就住宅室内照明艺术来说,任何漂亮、幽雅的房间和陈设,没有光则是一片昏暗.有了光,室内协调的色调,新颖的家具、美丽的装饰才能被表现出来,人才开始感觉到一切,才可以进行正
A study was conducted at two pair sites of Chittagong Hill Tracts in Bangladesh to find out the effects of shifting cultivation on soil fungi and bacterial popu
今年上半年,央行连续三次降息降准,补贴、降首付、降税费、提额度……,如此宽松的利好政策下,郑州楼市表现不俗,量价齐升,房价已经连续涨了8月.rn上半年房地产市场走势平稳rn
近日,四川省名牌战略领导小组办公室发布了《第十届四川名牌公告》。根据《四川省名牌产品管理办法》规定,四川省第十届名牌的评选和确认工作,通过企业自愿申报、质量经济数据指
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
设计制作了用于EAST托卡马克装置水平窗口的基于CdTe探头的硬X射线诊断单元.经与EAST联机试验运行,结果表明,该诊断单元设计原理正确,空间分辨率精度及辐射屏蔽达到设计目标,
推力器的电离效率直接影响到推力器的功率、比冲以及推力等重要工作参数,本文主要利用PIC模拟得到阳极层霍尔推力器放电等离子体的平均电子能量以及电子、离子数比率随电磁场