乌兰布和沙漠东北缘5种土地利用类型土壤粒度特征

发布时间：2018-04-03 23:57

本文选题：土壤粒度　切入点：分形维数　出处：《水土保持研究》2017年05期

【摘要】：研究荒漠化发生区域的土壤粒度特征,可为区域荒漠化防治及生态建设提供一定理论依据。通过野外调查、采样及室内分析,对乌兰布和沙漠东北缘5种不同土地利用类型(流动沙丘、草方格沙障固沙区、人工梭梭林、白刺群落和油蒿群落)的土壤粒度特征及分形维数进行了研究。结果表明:(1)5个样地土壤颗粒组成均以细沙为主,含量为66.49%~81.54%;粉沙含量最少,仅为0.58%~1.72%;不同粒级土壤颗粒百分含量由高到低为:细沙中沙极细沙粗沙粉沙。(2)5个样地土壤颗粒分形维数的差异极显著(p0.01),油蒿群落(1.72)白刺群落(1.56)人工梭梭林(1.44)流动沙丘(1.40)草方格沙障(1.37);土壤颗粒分形维数与粉沙、极细沙百分含量呈极显著正相关(p0.01),与细沙百分含量呈显著负相关(p0.05),与中沙和粗沙百分含量关系不显著(p0.05)。(3)天然植被生长区域,植被盖度较好,风沙土颗粒较细。因此,应加大对区域内天然植被的保护,防止土壤风蚀的发生与发展。
[Abstract]:The study of soil granularity characteristics in the region of desertification can provide a theoretical basis for regional desertification control and ecological construction.Through field investigation, sampling and laboratory analysis, five different land use types (mobile dune, grass grid sand barrier sand fixation area, artificial Haloxylon ammodendron forest) in the northeastern margin of Wu Lan and desert were studied.The soil granularity characteristics and fractal dimension of Spurr community and Artemisia annua community were studied.The results showed that the soil particle composition of the five plots was mainly fine sand, the content of which was 66.49 and 81.54, and the silt content was the least.The fractal dimension of soil particles and silt sand,The percentage of very fine sand was positively correlated with the percentage of fine sand, and negatively correlated with the percentage of fine sand, but not with the percentage of middle sand and coarse sand.) in the natural vegetation growing area, the vegetation coverage was better and the particles of aeolian sandy soil were finer.Therefore, the protection of natural vegetation in the region should be strengthened to prevent the occurrence and development of soil erosion.
【作者单位】：国家林业局内蒙古磴口荒漠生态系统定位研究站/中国林业科学研究院沙漠林业实验中心;中国林业科学研究院荒漠化研究所;内蒙古自治区准格尔旗水土保持局;
【基金】：科技部“十二五”农村领域国家科技计划课题(2012BAD16B0103) “内蒙古磴口荒漠生态系统国家定位观测研究站”运行补助(2015-LYPT-DW-024) 国家林业局防沙治沙专题“乌兰布和沙漠东北部荒漠化定位监测”
【分类号】：S152.3

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