宝鸡市净第一性生产力对土地利用变化的坡度、坡向条件响应  

Net Primary Productivity of Baoji City in Response to Landuse Changes in Different Slopes and Aspects

作　　者：陈伟青 薛亮 

机构地区：[1]陕西师范大学地理科学与旅游学院,陕西西安710119

出　　处：《水土保持通报》2017年第6期277-284,共8页Bulletin of Soil and Water Conservation

基　　金：科技基础性工作专项"黄土高原生态系统与环境变化考察"(2014FY210100)

摘　　要：[目的]研究坡度与坡向、土地利用变化以及净第一性生产力三者之间的内在联系,为区域生态可持续发展提供科学依据。[方法]选取陕西省宝鸡市作为研究区域,以宝鸡市数字高程模型和Landsat TM遥感影像为数据源,基于CASA模型计算净第一性生产力,探究宝鸡市净第一性生产力对土地利用变化的坡度、坡向条件响应。[结果]宝鸡市净第一性生产力的变化集中分布在林地、耕地和草地3种土地利用类型中,其中林地的影响最大。10a间有96%以上的林地保持不变,77%左右的草地转变为林地,林地总面积达12 239.67km2。林地在斜坡地中的净第一性生产力变化最为显著,净增长达到166 668.60g/(m2·a),在半阴坡区域的净第一性生产力增长值最高,达到182 230.00g/(m2·a)。耕地对净第一性生产力的影响集中分布在平坡和缓平地条件下,坡向范围为阳坡至半阴坡,在阳坡下具有最高值59 479.5g/(m2·a)。草地的变化受坡向条件的影响较小,因此在坡向条件中对净第一性生产力的影响也相对均衡,而坡度分布主要是斜坡地和缓坡地。[结论]宝鸡市总体呈现了较好的生态可持续发展态势,应在此基础上继续加大对生态环境的保护力度,充分利用宝鸡市的地理位置特征和地形特点,综合考虑斜坡地与半阴坡下林地的利用率,使其净第一性生产力持续增长。[Objective]Studying the relationship among slope aspects,land use change and net primary productivity,so as to provide scientific basis for regional ecological sustainable development.[Methods]We took Baoji City as an example to study the effect of land use change on regional net primary production based on different slopes and aspects with the help of digital elevation model and the Landsat TM images.We used the CASA model to estimate net primary production of Baoji City.[Results]From 2000 to 2010,the change of net primary productivity in Baoji City was concentrated in forest land,cultivated land and grassland,among which forest land had the greatest influence.More than 96% of forest lands remained unchanged in the past ten years,and about 77% of grasslands was transformed into forest lands.The total area of forest lands was 12 239.67 km2.The net primary productivity of forest lands in the sloping land was the most significant,with a net increase of 166 668.60 g/（m2·a）;and the net primary productivity increment in thesemi-shady aspect area was the highest,reaching 182 230.00 g/（m2·a）.The influence of cultivated land on the net primary productivity concentrated on the flat land and the gentle slope.The aspect＇s range is from the sunny aspect to the semi-shady aspect and the highest value was 59 479.5 g/（m2·a）at the sunny slope.The change of grassland was less affected by the aspect condition,so its effect on the net primary productivity was relatively balanced in the slope condition,and the slope distribution was mainly slope and gentle slope.[Conclusion]Overall,the ecosystem of Baoji City keeps a good situation.Moreover,keeping net primary production in sustained growth is very important,and to maintain the sustainable development of ecological environment,we should take better account of Baoji＇s location and terrain to make good use of the forest land in sloping land and the semi-shady aspect.

关 键 词：净第一性生产力 土地利用变化 坡度 坡向 宝鸡市 

分 类 号：K909[历史地理—人文地理学]