甘肃民勤人工梭梭林土壤粒度特征研究  

Soil Grain Size Characteristics of Artificial Haloxylon ammodendron Plantations in Minqin,Gansu Province

作　　者：张晓娟[1] 杨雪梅[1] 王飞[1] 王强强[1,3] 郭树江 张裕年[1,2] 张卫星 ZHANG Xiao-juan;YANG Xue-mei;WANG Fei;WANG Qiang-qiang;GUO Shu-jiang;ZHANG Yu-nian;ZHANG Wei-xing(Gansu Desert Control Research Institiute,Lanzhou 730070,Gansu,China;State Key Laboratory Breeding Base of Desertification and Aeolian Sand Disaster Combating,Wuwei 733000,Gansu,China;Gansu Minqin National Studies Station for Desert Steppe Ecosystem,Minqin 733300,Gansu,China)

机构地区：[1]甘肃省治沙研究所,甘肃兰州730070 [2]甘肃省荒漠化与风沙灾害防治国家重点实验室(培育基地),甘肃武威733000 [3]甘肃民勤荒漠草地生态系统国家野外科学观测研究站,甘肃民勤733300

出　　处：《西北林学院学报》2023年第4期82-89,共8页Journal of Northwest Forestry University

基　　金：国家自然科学基金(32060373,31960334,32060378,32060246,31700339);甘肃省青年科技基金计划项目(20JR10RA469);中科院“西部之光”项目。

摘　　要：梭梭(Haloxylon ammodendron)作为石羊河流域人工固沙林的主体,对维持区域生态环境稳定具有重要作用。通过对民勤不同年代营造的人工梭梭林0~100 cm层土壤粒度特征进行分析,研究梭梭造林后植被恢复过程中土壤粒度组成、分形维数及与土壤理化性质的作用关系。结果表明,1)民勤人工梭梭林土壤以细砂(100~250μm)为主(33.08%~65.83%),其次是中砂(15.42%~40.79%)。20世纪70年代营造的梭梭林土壤黏粒、粉粒及极细砂高于其他年代梭梭林。人工梭梭林对土壤粒度的影响主要在表层(0~10 cm)区域,较深土层变异较小。2)民勤人工梭梭林风沙土质地较粗,分选系数介于较好和较差之间,偏度为近对称-正偏度,峰值为中等-尖窄,分形维数变化范围为1.400~2.166。3)分形维数与黏粒、粉粒、极细砂含量呈极显著正相关(P<0.01),与细砂、中砂含量分别呈极显著(P<0.01)、显著(P<0.05)负相关。民勤人工梭梭林土壤粒度的形成受到土壤有机质、全N、速效P及pH的影响较大。研究结果为民勤人工林建设、沙化土地治理以及生态恢复提供理论依据。As the main body of artificial sand fixation forest in the Shiyang River basin,Haloxylon ammodendron plays an important role in maintaining the stability of regional ecological environment.By the method of field investigation and indoor analysis,based on the analysis of soil particle size characteristics in 0-100 cm layer of artificial H.ammodendron plantations with different ages,the relationship between soil particle size composition,fractal dimension and soil physicochemical properties in the process of vegetation restoration after establishing H.ammodendron plantation was studied.The results were as follows.1)The soil of the artificial H.ammodendron plantations in Minqin was mainly fine sand(33.08%-65.83%),followed by medium sand(15.42%-40.79%).The contents of clay,silty and very fine sand in the soil of H.ammodendron plantations established in 1970s were higher than others.The influence of artificial H.ammodendron plantation on soil grain size was mainly in the surface layer,and the variation was small in the deep soil layer.2)The soil texture of the H.ammodendron plantation in Minqin was coarser,the sorting coefficient was between good and poor,the skewness was near symmetric-positive,the peak value was medium-narrow,and the fractal dimension varied from 1.400 to 2.166.3)The fractal dimension was significantly and positively correlated with clay particles,silty particles and very fine sand(P<0.01),and negatively correlated with the content of fine sand and medium sand.The formation of soil grain size was significantly affected by soil organic matter,total nitrogen,available phosphorus and pH.The results provide theoretical basis for the construction of plantation,the management of desertified land and ecological restoration in Minqin.

关 键 词：人工梭梭林 土壤粒度 分形维数 土壤理化性质 

分 类 号：S152.3[农业科学—土壤学]