摘要
[目的]探讨阴山北麓不同土地利用类型土壤颗粒组成和有机质特征。[方法]选取内蒙古阴山北麓农牧交错区天然草地、旱作农田、弃耕地(弃耕2年)、新开垦农田(开垦1年)4种不同土地利用类型,分析典型样地土壤颗粒机械组成、土壤颗粒分形维数和有机质含量之间的关系。[结果]试验区土壤表层颗粒含量主要是粉粒和极细砂含量,其余粒级土壤颗粒的影响程度较小。0~80 cm土层中0~50μm粒级颗粒含量与分形维数呈一定函数关系,土壤分形维数与黏粒(<2μm)和粉粒(2~50μm)百分含量呈正相关,与其余粒级相关性不大。0~50 cm土层,4种土地利用类型土壤颗粒分形维数随土层深度的变化发生不同程度波动,总体上随深度增加呈上升趋势,且天然草地分形维数变幅最大,为0.083。0~80 cm土层颗粒平均分形维数由小到大依次为弃耕地(2.186)<新开垦农田(2.230)<旱作农田(2.275)<天然草地(2.290)。4种土地利用类型中弃耕地由于处在恢复阶段,在各层的有机质含量均表现为最低。[结论]4种土地利用类型中,天然草地土壤黏粒和粉粒含量最高,平均分形维数最大,有机质含量较高。
[Objective]To discuss the soil particle composition and organic matter characteristics of different land use types in the northern piedmont of Yinshan Mountain.[Method]Four different land use types were selected from the farming-pastoral ecotone in the northern piedmont of Yinshan Mountain,Inner Mongolia.The relationship between soil particle mechanical composition,soil particle fractal dimension and organic matter content in typical plots was analyzed.[Result]The soil surface particles in the test area were mainly silt and very fine sand,and the other soil particles had little influence.The particle content of 0-50μm in 0-80 cm soil layer was a function of fractal dimension.The fractal dimension was positively correlated with the percentage of clay particles(<2μm)and silt particles(2-50μm),but had little correlation with other grain sizes.In 0-50 cm soil layer,the fractal dimension of soil particles of four land use types fluctuated in varying degrees with the change of soil depth,and generally showed an upward trend with the increase of soil depth,and the maximum range of fractal dimension of natural grassland was 0.083.The average fractal dimensions of particles in 0-80 cm soil layer from small to large were abandoned land(2.186)<newly reclaimed farmland(2.230)<dry farmland(2.275)<natural grassland(2.290).The organic matter content of abandoned farmland in each layer was the lowest in the four utilization types because it was in the recovery stage.[Conclusion]Among the four land use types,natural grassland has the highest clay and silt content,the highest average fractal dimension,and the highest organic matter content.
作者
杨圃畅
蒙仲举
党晓宏
李浩年
张晓伟
李新
YANG Pu-chang;MENG Zhong-ju;DANG Xiao-hong(College of Desert Control,Inner Mongolia Agricultural University,Hohhot,Inner Mongolia 010018;Maowusu Sandy Land Ecological Development Co.,Ltd.,Ordos,Inner Mongolia 017300)
出处
《安徽农业科学》
CAS
2022年第24期49-52,89,共5页
Journal of Anhui Agricultural Sciences
基金
国家自然科学基金项目(4206070150)。
关键词
土壤粒径
颗粒粒级
分形维数
有机质含量
土地利用类型
农牧交错区
Soil particle size
Particle fraction
Fractal dimension
Organic matter content
Land use type
Agro-pastoral intersecting region
