侵蚀泥沙、有机质和全氮富集规律

The enrichments of organic matter and total nitrogen in sediment as affected by relavant factors

Serious soil erosion has already resulted in degradation of the Loess Plateau of China. Soil erosion is commonly accompanied by extensive soil nutrient loss. Because of enrichment processes,sediment nutrient content is often higher than that of natural soil. The objective of this study is to determine the enrichments of organic matter and total nitrogen in sediment in hilly and gully loess areas on the Loess Plateau of China. Measurements of enrichment ratios (ER) of organic matter (EROM) and total nitrogen (ERTN) in sediment as affected by rainfall, slope gradient, tillage, and fertilization were made in the field under natural rainfall conditions. The results showed that the enrichment of clay in sediment resulted in the enrichment of organic matter (OM) and total nitrogen (TN) in sediment. The averages of sediment clay ER, EROM and ERTN for the various slope gradients were 1.77, 2.09 and 1.61, respectively. The soil erosive module was negatively correlated with EROM and ERTN. Our results indicate that measures to reduce soil erosion, i.e. reducing rainfall erosivity, decreasing soil slope gradient, decreasing fertilizer use, and using level trenches, may increase EROM and ERTN. Both quantity and quality of sediment yield should be considered when implementing erosion control measures.

作 者：

张兴昌 郑纪勇 李世清 ZHANG Xingchang Zheng Jiyong Li Shiqing  

作者单位：

State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,Northwest Sci-tech University of Agriculture and Forestry,Yangling 712100,China 

刊 名：

地理学报（英文版）  ISTIC SCI

英文刊名：

JOURNAL OF GEOGRAPHICAL SCIENCES 

年，卷(期)：

2004 14(4) 

分类号：

P9 

关键词：

sediment   organic matter   total nitrogen   enrichment ratio  

机标分类号：

S15 S2 

机标关键词：

侵蚀泥沙有机质富集规律total nitrogenthe Loess Plateau of Chinaorganic mattersoil erosionnutrient contentcontrol measuressediment yieldfertilizer usenutrient loss 

基金项目：

国家重点基础研究发展计划(973计划)，国家自然科学基金，The Science Foundation of the State Key Laboratory of Soil Erosion and Dry Farming, CAS 

DOI：