宁夏中部干旱带不同自然地貌风蚀沙粒粒径特征研究  

Particle Size Characteristics of Wind Eroded Sand in Different Natural Landforms in Arid Zone of Central Ningxia

作　　者：张安东 左忠[1] 王红梅[3] 潘占兵[4] 李浩霞[1] ZHANG An-dong;ZUO Zhong;WANG Hong-mei;PAN Zhan-bing;LI Hao-xia(Institute of Desertification Control,Ningxia Academy of Agriculture and Forestry Sciences,Yinchuan,Ningxia750002,China;College of Life Sciences,Sichuan University,Chengdu,Sichuang 610065,China;College of Agriculture,Ningxia University,Yinchuan,Ningxia 750021,China;Research Institute of Ningxia Academy of Agriculture and Forestry Sciences,Yinchuan,Ningxia 750002,China)

机构地区：[1]宁夏农林科学院荒漠化治理研究所,宁夏银川750002 [2]四川大学生命科学学院,四川成都610065 [3]宁夏大学农学院,宁夏银川750021 [4]宁夏农林科学院科研处,宁夏银川750002

出　　处：《西北林学院学报》2018年第5期51-57,86,共8页Journal of Northwest Forestry University

基　　金："全国退耕还林工程生态效益监测(宁夏)";宁夏回族自治区一二三产业融合发展科技创新示范项目"宁夏多功能林业分区域研究与示范";2015年中央财政林业科技推广示范项目"宁夏半干旱黄土丘陵区退化生态系统恢复技术示范推广"(2015[04])

摘　　要：以宁夏中部干旱带不同自然地貌作为试验样地,应用诱捕法收集风蚀沙粒,通过激光粒度分析仪分析沙粒粒径后,判断各试验点的土壤组成,分析评价沙粒粒径与地表风蚀相关性。结果表明,半固定沙地、流动沙地以及沙柳林地风蚀沙粒以细沙粒为主,占比95%左右,粗砂粒占比5%左右,无粉粒,风蚀沙源主要以就地起沙为主;花棒林、沙蒿林和农田防护林带内风蚀沙粒有8%~12%粉粒,天然草地粉粒占比29.04%,放牧草地粉粒占比69.38%,细沙粒含量较少,植被固沙效果明显,风蚀强度呈下降趋势,沙源以就地起沙为主,但有部分沙源属于外来沉降,土壤状况逐步改善;柠条退耕地、废弃村庄以及封育草地的固沙效果较好,风蚀沙粒主要以粉粒为主,占比90%,风蚀沙源多外来沉积,风蚀强度降低;耕作农田中黄绵土粉粒比例一般高于风沙土,抗风蚀能力较强。Sand samples of wind erosion were collected by trapping method from natural terrains which were in different wind erosion environments in arid zone of central Ningxia.Laser particle size analyzer was used to analyze the diameters of the sand particles.Soil compositions of the sampling plots were analyzed.The relationship between sand particle size and surface wind erosion was discussed.In semi-fixed sandy land,moving sandy land,and Salix cheilophila forest land,fine grains were the main components of wind eroded sands,accounting for about 95%,coarse sand grains accounted for about 5%,no powdery sand grains were found.The source of wind erosion was mainly from the local.While in the forest lands of Hedysarum scoparium,Artemisia desertorum and shelterbelt,8%to 12%of powdery sand were observed,it was 29.04%in natural grasslands,and 69.38%in grazing grass lands.Low contents of fine sand grains indicated that vegetations in these lands had significant effects in fixing sand and decreasing winding erosion intensity.Also,the source of winding erosion was mainly from the local,while partial was from foreign sources.The best soil improvement occurred in Caragana korshinskii,abandoned villages and enclosure grassland,manifested by 90%powdery grain content.The main source of wind erosion was mostly external deposition with decreased winding erosion intensity.The proportion of powdery sand in cultivated land of loess soil area was significantly higher than that in sandy soil area.Soil erosion resistance ability was higher than sandy soil.

关 键 词：宁夏中部干旱带 自然地貌 风蚀 沙粒粒径 

分 类 号：P931.3[天文地球—自然地理学]