锡林郭勒草原植被覆盖度时空动态与影响因素分析

发布时间：2018-05-11 03:04

本文选题：锡林郭勒草原 + 植被覆盖度　；参考：《农业机械学报》2017年03期

【摘要】：以MODIS地表辐射率数据对内蒙古自治区锡林郭勒草地进行研究,分析了2001—2013年生长季(4—10月份)草甸草原、典型草原、沙地草原和荒漠草原4种草地类型植被覆盖度(fv)的时空变化特征,用变异系数(C_v)衡量各类草原f_v的变化程度,并结合气象和放牧数据分析气候变化和人类活动(放牧)对草地f_v的影响。结果表明,在不同年份各类型草原f_v均表现为由东向西递减的规律,同类型草原年际间fv呈不显著波动变化。研究区多年f_v的Cv结果表明有78.66%地区属脆弱和很脆弱水平,其中典型草原和沙地草原属脆弱级别,而荒漠草原属很脆弱级别,只有草甸草原属稳定级别。降水量对f_v的影响较大,呈显著正相关关系;而温度对fv的影响较小,呈不显著负相关关系;牲畜养殖数量对f_v影响较大,锡林郭勒盟草原的适宜综合牲畜养殖数量为39只/km~2(以标准羊计)。
[Abstract]:The grassland of Xilingol in Inner Mongolia Autonomous region was studied with MODIS surface emissivity data, and the meadow grassland, typical grassland, was analyzed in the growing season of 2001-2013 from April to October. The temporal and spatial variation characteristics of vegetation cover degree of four grassland types in sandy grassland and desert steppe were measured by the coefficient of variation (Cvv), and the variation degree of fv in different steppe was measured by the coefficient of variation (Cvv). The effects of climate change and human activities (grazing) on fv of grassland were analyzed with meteorological and grazing data. The results showed that the fv of all types of steppe decreased from east to west in different years, and there was no significant fluctuation of fv among the same types of steppe. The Cv results of fv for many years in the study area showed that 78.66% of the regions were fragile and very fragile, among which the typical steppe and sandy grassland were fragile, while the desert steppe was very fragile, and only meadow steppe was stable. The effect of precipitation on fv was significant positive correlation, while temperature had little effect on fv and had no significant negative correlation. The suitable number of integrated livestock in the Xilingol prairie is 39 / kmmc2 (measured by standard sheep).
【作者单位】：内蒙古农业大学水利与土木建筑工程学院;内蒙古自治区水资源保护与利用重点实验室;
【基金】：国家自然科学基金项目(51569017、51269014、51139002) 教育部创新团队发展计划项目(IRT13069) 中国博士后科学基金项目(2015M572630XB) 内蒙古自然科学基金项目(2015MS0514)
【分类号】：S812

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