摘要
[目的]探究查干淖尔干盐湖附近沙化土地防护林下的土壤机械组成与生态效应,为当地的防护林建设与沙化土地治理提供科技支持。[方法]以查干淖尔干盐湖南缘沙地柽柳和梭梭两种防护林的带间、根颈和冠幅下0—20 cm的土壤为研究对象,土壤样品的机械组成用激光粒度仪测定得出,计算并分析了平均粒径、标准偏差、偏度、峰态和分形维数等粒度参数。[结果](1)研究区土壤机械组成以砂粒为主,相较于裸沙地(CK),柽柳和梭梭(带间、根颈、冠幅下)黏粉粒总含量分别增加了5.19%,0.59%,20.44%和1.53%,3.93%,4.32%,其中在冠幅下表现最为明显。(2)防护林下的土壤分选性较差,偏度均为正偏,向着尖窄方向发展;分形维数介于2.13~2.70,两种防护林冠幅下的分形维数均高于带间与根颈,与对照相比,防护林下土壤粒径整体向细粒趋势发展。(3)土壤粒度频率显示防护林各位置斜率均偏低,表明两种防护林的颗粒径级丰富度优于对照。[结论]各粒度参数及分维值反映两防护林对于当地沙化土壤有改良作用,柽柳防护林下土壤细粒化趋势更为明显。
[Objective]The aims of this study are to investigate the soil mechanical composition and ecological effect under the protection forest of sandy land near Qehan Dry Salt Lake,and to provide scientific and technological support for local protection forest construction and sandy land management.[Methods]The soil samples of 0—20 cm were collected in inter-belt,root neck and under canopy of two protection forests,Tamarix chinensis and Haloxylon ammodendron on the southern edge of Qehan Dry Salt Lake.The mechanical composition of soil samples was measured by laser particle sizer.And the average particle size,standard deviation,skewness,peak state and fractal dimension were calculated and analyzed.[Results](1)The soil mechanical composition is mainly composed of sand particles,compared to bare sand(CK),the total contents of clay and silt increased by 5.19%,0.59%,20.44%and 1.53%,3.93%,4.32%in Tamarix chinensis and Haloxylon ammodendron(inter-belt,root neck and under canopy),respectively,with the most pronounced performance under canopy.(2)Soil sort ability was poor under shelterbelts,with a positive skewness towards a narrower tip;the fractal dimensions was between 2.13~2.70,higher under both shelterbelt canopies than between strips and root necks,and the overall particle size tended towards finer particles compared to CK.(3)Soil particle size frequencies revealed low slopes at all locations in the shelterbelts,indicating that the particle size class richness of both shelterbelts was better than those in the control.[Conclusion]The particle size parameters and sub-dimensional values reflect the improvement of the local sandy land by the two protected forests,with the trend of fine-grained soil under the red willow protection forest more obvious.
作者
蔡佳乐
蒙仲举
罗建国
孟芮冰
祁帅
阿拉腾陶格苏
Cai Jiale;Meng Zhongju;Luo Jianguo;Meng Ruibing;Qi Shuai;Alatengtaogesu(College of Desert Control Science and Engineering,Inner Mongolia Agricultural University,Hohhot 010018,China;Otokqian Banner Forestry Ecological Protection Center,Ordos,Inner Mongolia 016200,China;Ordos Geological Survey and Monitoring Institute,Ordos,Inner Mongolia 016200,China)
出处
《水土保持研究》
CSCD
北大核心
2024年第4期179-187,196,共10页
Research of Soil and Water Conservation
基金
国家自然科学基金(4206070150)
内蒙古科技攻关项目(2022YFDZ0027)。
关键词
查干淖尔干盐湖
防护林
柽柳
梭梭
粒度特征
Qehan Dry Salt Lake
protective forest
Tamarix chinensis
Haloxylon ammodendron
granularity features
