土壤粒径及有机碳特征对灌丛沙堆发育阶段的影响研究

发布时间：2018-03-16 12:09

本文选题：柠条　切入点：灌丛沙堆　出处：《土壤通报》2017年05期 　论文类型：期刊论文

【摘要】：为揭示风沙区柠条灌丛沙堆的发育规律,并为灌丛沙堆的发育阶段划分提供参考,对大、中、小三种柠条(Caragana korshinskii)灌丛沙堆顶部、中部和底部的土壤颗粒组成及分形维数、土壤有机碳特征进行研究。结果表明:土壤有机碳含量随灌丛沙堆的增大而递减,与灌丛及其沙堆的外部形态特征呈显著性负相关;随灌丛沙堆的增大,细砂含量逐渐增加,粉粒的含量逐渐减少;土壤粒径分形维数随灌丛沙堆的增大而递减,其与土壤黏粒、粉粒呈显著性正相关,与细砂、极细砂的百分含量呈负相关;土壤有机碳含量与土壤粒径分形维数之间存在显著性正相关。灌丛沙堆具有明显的空间异质性,沙堆上的土壤有机碳含量与土壤的颗粒组成与沙堆大小具有一定的相关性,并可作为划分沙堆发育阶段的标准,但需要充分考虑风力、植物和沙源等因素的影响。
[Abstract]:In order to reveal the development rule of Caragana korshinskii in wind-sand area, and to provide reference for the division of the development stage of the shrub sand heap, the soil particle composition and fractal dimension of the top, middle and bottom of the shrub sand heap of Caragana korshinskii, three species of Caragana korshinskii, were studied. The results showed that the content of soil organic carbon decreased with the increase of shrub sand pile, and was negatively correlated with the external morphological characteristics of shrub and sand heap, and the content of fine sand increased gradually with the increase of shrub sand heap. The fractal dimension of soil particle size decreased with the increase of shrub sand, which was positively correlated with soil clay and silt, and negatively correlated with the percentage of fine sand and very fine sand. There was a significant positive correlation between soil organic carbon content and fractal dimension of soil particle size. It can be used as the criterion for dividing the developing stage of sand heap, but the factors such as wind, plant and sand source should be taken into account.
【作者单位】：宁夏大学西北土地退化与生态恢复国家重点实验室培育基地;宁夏大学西北退化生态系统恢复与重建教育部重点实验室;
【基金】：宁夏自然科学基金项目:荒漠草原人工灌木林地下水埋深生长季的变化规律及其与降水量关系(No.NZ15001)资助
【分类号】：S152.3;S153.6

【相似文献】