干旱区生态环境知识资源中心(Arid): 宁夏荒漠草原沙漠化过程中土壤粒径分形特征

Arid

	宁夏荒漠草原沙漠化过程中土壤粒径分形特征
其他题名	Fractal features of soil particle size in the process of desertification in desert grassland of Ningxia,China
	阎欣; 安慧
来源期刊	应用生态学报
ISSN	1001-9332
出版年	2017
卷号	28 期号:10 页码:3243-3250
中文摘要	研究宁夏荒漠草原沙漠化过程中土壤性状、土壤粒径分形维数的变化特征,以及分形维数与土壤性状的关系.结果表明:草地沙漠化对土壤分形维数(D)影响显著,D值为1.69~2.62.除在10~20 cm土层出现较小波动外,随着沙漠化程度加剧,0~ 30 cm土层D值整体呈减小趋势.在荒漠草原沙漠化过程中,荒漠草地D值最大,黏粒和粉粒体积百分含量最高,极细砂粒和细砂粒体积百分含量最低;流动沙地D值最小,黏粒和粉粒体积百分含量最小,极细砂粒和细砂粒体积百分含量最高.D与<50 mum和>50 mum粒径的土壤颗粒存在显著正相关和负相关,表明50 mum粒径是决定草地沙漠化过程中土壤分形维数与土壤粒径关系的临界粒径.随着荒漠草原沙漠化加剧,土壤有机质和全氮含量逐渐降低,土壤容重逐渐升高,固定沙地至半固定沙地是荒漠草原沙漠化的质变过程,其中土壤粘粒体积百分含量、粉粒体积百分含量、土壤有机质含量、土壤全氮含量骤减,极细砂粒体积百分含量、细砂粒体积百分含量和土壤容重骤增.分形维数与土壤有机质、土壤全氮和土壤容重显著相关,固定沙地与半固定沙地分形维数的临界值为2.58,因此分形维数2.58可作为荒漠草原沙漠化的退化指标.
英文摘要	The variation of soil properties,the fractal dimension of soil particle size,and the relationships between fractal dimension of soil particle size and soil properties in the process of desertification in desert grassland of Ningxia were discussed. The results showed that the fractal dimension (D) at different desertification stages in desert grassland varied greatly,the value of D was between 1.69 and 2.62. Except for the 10-20 cm soil layer,the value of D gradually declined with increasing desertification of desert grassland at 0-30 cm soil layer. In the process of desertification in desert grassland,the grassland had the highest values of D,the volume percentage of clay and silt, and the lowest values of the volume percentage of very fine sand and fine sand. However,the mobile dunes had the lowest value of D,the volume percentage of clay and silt,and the highest value of the volume percentage of very fine sand and fine sand. There was a significant positive correlation between the soil fractal dimension value and the volume percentage of soil particles <50 mum,and a significant negative correlation between the soil fractal dimension value and the volume percentage of soil particles >50 mum. The grain size of 50 mum was the critical value for deciding the relationship between the soil particle fractal dimension and the volume percentage. Soil organic matter (SOM) and total nitrogen (TN) decreased gradually with increasing desertification of desert grassland,but soil bulk density increased gradually. Qualitative change from fixed dunes to semi-fixed dunes with the rapid decrease of the volume percentage of clay and silt,SOM,TN and the rapid increase of volume percentage of very fine sand and fine sand,soil bulk density. Fractal dimension was significantly correlated to SOM,TN and soil bulk density. Fractal dimension 2.58 was a critical value of fixed dunes and semi-fixed dunes. So,the fractal dimension of 2.58 could be taken as the desertification indicator of desert grassland.
中文关键词	土壤粒径分布 ; 土壤分形维数 ; 土壤理化性质 ; 沙漠化 ; 荒漠草地
英文关键词	soil particle size distribution (PSD) soil fractal dimension soil physical and chemical characteristics desertification desert grassland
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:6085118
来源机构	宁夏大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236916
作者单位	宁夏大学, 西北土地退化与生态恢复宁夏省部共建国家重点实验室培育基地;;西北退化生态系统恢复与重建教育部重点实验室, 银川, 宁夏 750021, 中国
推荐引用方式 GB/T 7714	阎欣,安慧. 宁夏荒漠草原沙漠化过程中土壤粒径分形特征[J]. 宁夏大学,2017,28(10):3243-3250.
APA	阎欣,&安慧.(2017).宁夏荒漠草原沙漠化过程中土壤粒径分形特征.应用生态学报,28(10),3243-3250.
MLA	阎欣,et al."宁夏荒漠草原沙漠化过程中土壤粒径分形特征".应用生态学报 28.10(2017):3243-3250.