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晋西北防护林30年来时空变化特征及影响要素

李秀芬1,苏蕾2,张金鑫3,张泽秀1,刘利民1**,刘雪峰1   

  1. 1沈阳农业大学, 沈阳 110866; 2东北林业大学, 哈尔滨 150036; 3中国科学院沈阳应用生态研究所, 沈阳 110016)
  • 出版日期:2013-09-10 发布日期:2013-09-10

Spatiotemporal variation characteristics and influencing factors of protection forests after their 30 years construction in Northwest Shanxi Province of China.

LI Xiu-fen1, SU Lei2, ZHANG Jin-xin3, ZHANG Ze-xiu1, LIU Li-min1**, LIU Xue-feng1   

  1. (1Shenyang Agricultural University; Shenyang 110866, China; 2Northeast Forestry University; Haerbin 150036, China; 3Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China)
  • Online:2013-09-10 Published:2013-09-10

摘要:

为了了解晋西北地区防护林建设30年来的变化情况,采用ERDAS和GIS分析工具对该地区1980年、1990年、2000年和2007年4期遥感影像进行人工目视解译,分析了该地区防护林近30年的时空变化特征,并对引起这种变化的驱动力因素进行了探讨。结果表明:近30年防护林空间分布格局变化不大,以灌木分布最多(约占整个林地面积的50%),针阔混交林最少(不到林地面积的10%);近30年防护林的总面积呈减少趋势,3个时段(1980—1990年、1990—2000年和2000—2007年)的年变化率分别为-2.04%、0.62%和-0.029%;近30年的林地变化主要以林地与耕地和草地间的相互转化为主,各类型林地间相互转变次之;政策因素是影响林地变化的主要因素;此外,地表水文及人为干扰对林地时空变化也产生了影响。
 

关键词: 高浓度镉, 高浓度锌, 抗氧化系统, 复合影响, 烟草

Abstract: In order to understand the variation characteristics of the protection forests after their 30 years construction in Northwest Shanxi Province of China, the remote sensing images of Northwest Shanxi in 1980, 1990, 2000 and 2007 were used for visual interpretation, and the spatiotemporal variation characteristics of the protection forests and related driving forces were analyzed. There were no significant variations in the spatial pattern of the protection forests during the 30 years. Among the protection forests, shrub forests dominated (about 50% of the total), and coniferous-broadleaved mixed forests took the least percentage (<10%). The total area of the protection forests during the 30 years presented a decreasing trend, with the annual variation rate in 1980-1990, 1990-2000, and 2000-2007 being -2.04%, 0.62%, and -0.029%, respectively. The variations of the protection forests were dominated by the conversions among woodland, farmland, and grassland, followed by the conversions among different woodland types. Policy was the main factor causing the variation of woodland. In addition, surface water conditions and human disturbances also played important roles in the variations of protection forests in the study region.

Key words: combined effect, elevated Cd2+, elevated Zn2+, tobacco, antioxidant system.