侵蝕泥沙、有機質和全氮富集規律

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

doi：

Abstract：

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：	張興昌鄭紀勇李世清
Author：	ZHANG Xingchang  Zheng Jiyong  Li Shiqing
作者單位：	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
期 刊：	地理學報（英文版）   ISTICSCI
Journal：	JOURNAL OF GEOGRAPHICAL SCIENCES
年，卷(期)：	2004, 14(4)
分類號：	P9
Keywords：	sediment    organic matter    total nitrogen    enrichment ratio
機標分類號：	S15 S2
機標關鍵詞：	侵蝕泥沙    有機質    富集規律    total nitrogen    the Loess Plateau of China    organic matter    soil erosion    nutrient content    control measures    sediment yield    fertilizer use    nutrient loss
基金項目：	國家重點基礎研究發展計劃(973計劃)，國家自然科學基金，The Science Foundation of the State Key Laboratory of Soil Erosion and Dry Farming, CAS