摘要
为阐明农田弃耕后土壤质量演变特征,在阴山北麓中段农牧交错区内选择当年耕地、弃耕1 a、2 a、3 a、4 a5种类型土地进行研究,测定弃耕农田0-80 cm层土壤颗粒特征和有机质含量,基于多重分形理论分析的基础上,探究土壤粒径分布与有机质含量的关系。结果表明：砂粒含量与多重分形参数（D0、D1、α0）之间存在正相关关系,与有机质成极显著负相关;研究区内土壤随着砂粒含量的增加,土壤粒径分布范围逐步变宽,分布越离散,土壤向粗粒化方向演替。随着弃耕年限的延长,表层（0-10 cm）土壤表现出黏粒、有机质含量呈一致减少趋势,黏粒含量与土壤有机质呈极显著正相关。因此,可以考虑用黏粒含量反应土壤有机质变化趋势。
In this study,the 5 types of abandoned farmland in the middle reaches of the Yinshan Mountain were lucubrated so as to investigate the characteristics of spatial variation and nonuniform soil particle size during the process of abandoned farmland succession.These types included the farmland abandoned in the same year and for1,2,3 and 4 years respectively,and the distribution of soil particle size and of soil organic matter content at soil layer of 0-80 cm in depth was analyzed.Base on the multifractal theory analysis,the distribution of soil particles was determined,and its relationship with the variation of soil organic matter content was explored.The results showed that the sand content was positively correlated to multifractal parameters D0,D1andα0,but it was negatively correlated to the organic matter content.The distribution of soil particle size was mainly affected by sand content in the study area.With the increase of sand content in soil,the distribution range of soil particle size became wider and more discrete,and the soil progressed in a coarse-grained succession.With the increase of farmland-abandoned years,both the cosmid content and organic matter content in topsoil were in a decrease trend,and there was an extremely significant positive correlation between them,so the change trend of cosmid content could be used to predict the change trend of organic matter content in topsoil.
作者
王燕
斯庆毕力格
贾旭
蒙仲举
吕世杰
WANG Yan;String Bilge;JIA Xu;MENG Zhong-ju;LV Shi-jie(College of Desert Control Science and Engineering,Inner Mongolia Agricultural University,Hohhot 010018,Inner Mongolia,China;Erdos Forestry Bureau,Erdos 610051,Inner Mongolia,China;College of Science,Inner Mongolia Agricultural University,Hohhot 010018,Inner Mongolia,China)
出处
《干旱区研究》
CSCD
北大核心
2018年第4期804-812,共9页
Arid Zone Research
基金
国家自然基金项目(51769019)
内蒙古农业大学青年科学基金项目(2014XYQ-8)
关键词
弃耕农田
多重分形
土壤粒径
有机质
半干旱区
abandoned farmland
multifraetal
soil particle size
organic matter content
semiarid area
