FOREST LANDSCAPE PATTERN DYNAMICS OF LUONING COUNTY IN HENAN PROVINCE AND ITS DRIVING FORCES

来源 :中国地理科学 | 被引量 : 0次 | 上传用户:zliang_1981
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
With the help of ARC/INFOR and ERDAS software, based on the information from forest resources distribution maps and TM images, four indices were chosen to analyze spatial pattern changes of forest landscape of Luoning County, Henan Province from 1983 to 1999. The results showed that: 1) The number and total area of patches were rapidly increased with time changes. The fragmentation degree of the landscape was increasing great-ly. 2) The area of some forest patch types, especially shrub forest, economic forest, Populus spp. Forest, Quercus spp. Forest, sparse forest, deserted grassland etc. Had been greatly changed. 3) The fragemation degree of each forest patch type became greater from 1983 to 1999.4) The transition probabilities of deserted forest, economic forest,Pi-nus tabulaeformis forest, Populus spp. Forest exceed 85%,Robinia pseuoacacia forest, deserted grassland, 65% and Quercus spp. Forest, non-forest, shrub forest had smaller ones, which were 26.5%, 29.1% and 45.3%, respec-tively. The main transition trends of various patches were non-forest and Quercus spp. Forest. During the course of transition, the types that 50% of area was remained were Quercus spp. Forest, non-forest and shrub forest. Accord-ing to above analyses, the main driving forces, such as the management policies, market economy factors and influ-ences of human activities etc. Were brought out.
其他文献
当前随着现代化建设的发展,城市建设和文物古迹的保护之间的冲突越来越多。如何更好的协调好城市建设和文物保护的关系,如何使两者协调发展,本文通过对广东地区城市发展和文物保
目的:建立丝石竹药材质量标准。方法观察丝石竹药材性状、显微特性;采用薄层色谱法(tlc)进行药材鉴别;测定药材的杂质、水分、总灰分、重金属及浸出物含量;高效液相色谱法(HPlc)测定
Tetraselmis sp.-1 is a new microalgae strain constructed by cell fusion technique. In this paper, the mixotrophic cultivation of Tetraselmis sp.-1 in airlift ph
目的:比较常规凿骨劈冠法与超声骨刀法在拔除下颌低位水平阻生智齿时的手术操作时间,术中及术后并发症,为临床选择合适的拔牙方法提供参考。方法两侧智齿阻生类型均为下颌低位水
This paper presents an analytical model for predicting VOC waste gas degradation in a trickling biofilter. To facilitate the analysis, the packed bed is simplif
楮头红作为闽南地区广泛应用的极有价值的名贵中草药,具有清热平肝,利湿解毒作用。本文对楮头红的品种及生药学鉴定、化学成分、药理活性及质量控制进行综述,为楮头红资源今后研
目的:观察米非司酮治疗妇产科疾病的临床疗效。方法选取2012年7月至2014年1月我院收治的103例妇产科疾病患者,均使用米非司酮进行相关疾病的治疗,并对患者的临床资料进行回顾性
The Changjiang River (Yangtze) is one of the fastest growth areas of container transportation in Chi-na. Rail, road and water transportation have competed again
Hunter-gatherer populations in greater northeast Asia experienced dramatic range expansions during the early Upper Paleolithic (45-22 ka) and the late Upper Pal
目的:探讨内科治疗重症非胆源性胰腺炎的应用价值。方法回顾性分析重症非胆源性胰腺炎123例患者的临床资料,其中102例内科治疗,21例手术治疗。结果102例内科治疗患者中,治愈出院