摘要
文章通过对乌兰布和沙漠人工植被区不同建植年份内不同植被覆盖度的梭梭(Haloxylon ammodendron)-甘草(Glycyrrhiza uralensis)植物群落的地表颗粒粒度特征的研究,探讨不同建植年份以及不同植被覆盖度群落地表土壤风蚀粗粒化差异及特征,揭示沙区梭梭-甘草群落配置模式的植被治沙效果,结果表明:①低盖度(<20%)梭梭-甘草人工植被群落地表土壤粒度随建植年份增加其组分变化不显著,中高盖度(>20%)梭梭-甘草人工植被群落地表土壤粒度随建植年份增加粉沙黏土组分含量显著增加。显然,中高盖度梭梭-甘草群落对沙化地表阻沙固尘能力显著,显著增强地表抗风蚀性。②土壤中细小颗粒(如黏粒、粉粒)的数量与颗粒的分形维数值呈正比关系,细小颗粒数量随分形维数值的增加而增多,同时分形维数值越大,其颗粒的平均粒径、偏度数值就会越小。
The differences and characteristics of surface soil wind erosion in different planting years and different vegetation coverage communities were analyzed based on the study on the characteristics of the topsoil grain size of Haloxylon ammodendron-Glycyrrhiza uralensis artificial vegetation with different coverage in different years in Ulanbuh Desert. Moreover, the effect of vegetation on sand control in Haloxylon ammodendron-Glycyrrhiza uralensis community configuration model was investigated and revealed. The results are as follows:① the topsoil grain size of low coverage(<20 %) Haloxylon ammodendron-Glycyrrhiza uralensis artificial vegetation community did not change significantly with the increase of planting year, while the topsoil grain size of middle and high coverage(>20 %) Haloxylon ammodendron-Glycyrrhiza uralensis artificial vegetation increased with the planting year, and the content of silt clay increased greatly. Obviously,the middle-and-high-coverage Haloxylon ammodendron-Glycyrrhiza uralensis community can significantly resist sand and dust on the desertified surface, and remarkably improve the wind erosion resistance of the surface. ② The number of fine particles(such as sticky particles and powder particles) in the soil is in direct proportion to the fractal dimension value of the particles. The number of small particles increases with the increase of fractal dimension value, and the larger the fractal dimension value is, the smaller the average particle size and skewness value of the particles.
作者
包晨曦
左合君
王海兵
闫敏
BAO Chenxi;ZUO Hejun;WANG Haibing;YAN Min(College of Desert Control Science and Engineering/Inner Mongolia Key Laboratory of Aeolian Physics and Desertification Control Engineering,Inner Mongolia Agricultural University,Hohhot 010011,Inner Mongolia,China)
出处
《内蒙古林业调查设计》
2020年第3期96-104,共9页
Inner Mongolia Forestry Investigation and Design
基金
国家重点研发计划“乌兰布和沙漠生态园区沙产业技术和模式集成与示范(2016YFC0501009)”。
关键词
植被覆盖度
风蚀
粒度特征
vegetation coverage
wind erosion
characteristics of the grain size
