黄土高原中部降水梯度带植被覆盖度动态变化特征
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国家自然科学基金项目"黄土高原降水梯度带生态水文过程演变与最佳植被盖度研究"(41171186)


Dynamical Change of Fractional Vegetation Cover in Central Precipitation Gradient Zone of Loess Plateau
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    摘要:

    黄土高原植被生长的水分环境从东南向西北呈现明显的梯度变化,定量分析各降水梯度带植被覆盖度空间分布特征和演变趋势,对正确评价退耕还林草工程的生态效应具有重要意义。选择一条垂直于降水梯度变化的样带,利用MODIS/NDVI数据,基于像元二分模型获取了研究区2000-2010年植被覆盖度空间分布特征,采用斜率法和相关系数法分析了植被覆盖度的变化趋势和影响因素。结果表明:(1)研究区植被覆盖度在空间分布上由东南向西北降低,东南部地区植被覆盖度达82.6%,北部荒漠地区仅为38.6%; (2)由于退耕还林草工程的实施,该区11 a间植被覆盖度整体呈现上升趋势,其中2007年植被覆盖度值最高,为65.3%,与降水年际变化趋势一致; (3)研究区植被覆盖度主要受当年4-8月降雨量和气温影响,时间序列具有显著相关性。

    Abstract:

    Soil water condition for vegetative growth in Loess Plateau presents a gradient change from Southeast to Northwest. Quantitative analyses of spatial distribution and temporal change of fractional vegetative cover(Fc) can offer an important indication for evaluating the regional environmental changes after the implementation of returning farming land to forestry and grass land. The MODIS/NDVI images with 250 m×250 m spatial resolution were used as the data source to estimate Fc in the central precipitation gradient zone of Loess Plateau based on a dimidiate pixel method, and the spatial distribution and temporal change of Fc were obtained for the period from 2000 to 2010. The spatial characteristics and temporal trend of Fc were analyzed, while the relationships of Fc with climatic factors were discussed. Results showed that: (1) The Fc in the studied zone presented a decreasing trend from southeast to northwest. The maximum Fc value in southeastern region was 82.6% and the minimum Fc value in northwestern desert was only 38.6%; (2) The average Fc value in the studied zone appeared an increasing trend from 2000 to 2010 due to implementation of the project of returning farming land to forestry or grass land. The maximum average Fc value of 65.3% occurred in 2007 because of the maximum annual precipitation during the studied period; (3) The Fc value in the studied zone was affected by the precipitation and the temperature during the period of April to August in each year, the regression analyses of time series proved a significantly positive correlation between Fc and total precipitation and between Fc and average temperature.

    参考文献
    [1] 孙睿,刘昌明,朱启疆. 黄河流域植被覆盖度动态变化与降水的关系[J]. 地理学报. 2001,56(6):667-672.
    [2] 李存珍,马明国,张峰,等. 1982-2003年中国西北地区植被动态变化格局分析[J]. 遥感技术与应用,2006,21(4):332-337.
    [3] 夏露,刘咏梅,柯长青. 基于SPOT4数据的黄土高原植被动态变化研究[J]. 遥感技术与应用,2008,23(1):67-71.
    [4] 杨文治,马玉玺,韩仕峰,等. 黄土高原地区造林土壤水分生态分区研究[J]. 水土保持通报. 1994,8(1):1-9.
    [5] 朴世龙,方精云.最近18年中国植被覆盖的动态变化[J]. 第四纪研究,2001,21(4):294-302.
    [6] 李海亮. 基于MODIS数据的石羊河流域植被覆盖时空变化研究[D]. 甘肃兰州:西北师范大学,2009.
    [7] 赵英时. 遥感应用分析原理与方法[M]. 北京:科学出版社,2003:1387-398.
    [8] Stow D A, Hope A, Mc Guire D. Remote sensing of vegetation and land-cover change in Arctic Tundra ecosystems[J]. Remote Sensing of Environment, 2004, 89(3):281-308.
    [9] 陈云浩,李晓兵,史培军,等. 北京海淀区植被覆盖的遥感动态研究[J]. 植物生态学报,2001,25(5):588-593.
    [10] 陈涛,李平湘,张良培. 武汉地区1988-2002年植被覆盖度变化动态分析[J]. 遥感技术与应用,2008,5(23):511-516.
    [11] 何彬方,冯妍,吴文玉,等. 安徽省十年植被指数时空变化特征[J]. 生态学杂志,2010,29(10):1912-1918.
    [12] 李苗苗. 植被覆盖度的遥感估算方法研究[D]. 北京:中国科学院,2003.
    [13] 吴云,曾源,赵炎,等. 基于MODIS数据的海河流域植被覆盖度估算及动态变化分析[J]. 资源科学,2010,32(7):1417-1423.
    [14] 宋富强,邢开雄,刘阳,等. 基于MODIS/NDVI的陕北地区植被覆盖动态监测与评价[J]. 生态学报,2011,31(2):354-363.
    [15] 苗正红,刘志明,王宗明,等. 基于MODIS NDVI的吉林省植被覆盖度动态遥感监测[J]. 遥感技术与应用,2010,25(3):387-393.
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李杏鲜,连晋姣,黄明斌.黄土高原中部降水梯度带植被覆盖度动态变化特征[J].水土保持通报,2014,(2):272-275

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  • 收稿日期:2014-01-24
  • 最后修改日期:2014-02-03
  • 在线发布日期: 2016-03-29