黄土高原典型土壤有机氮组分剖面分布的变化特征

doi:10.3864/j.issn.0578-1752.2011.24.007

Abstract

Abstract: 【Objective】 In order to evaluate the effects of location, soil depth and land use on the contents of soil organic nitrogen (N), the size and composition of soil organic N pool were studied using a large variety of soil profiles sampled on the Loess Plateau. 【Method】 Based on different soil types and land-use patterns, 96 soil samples in 8 depth classes（0-10, 10-20, 20-40, 40-60, 60-80, 80-100, 100-120 and 120-140 cm）were collected from different regions on the Loess Plateau. The method of Bremner was used to test the soil organic N content.【Result】Even with the same land use pattern, the content of soil depth-specific total soil hydrolysable N and its components increased from north to south on the Loess Plateau. The proportion of organic N components within total hydrolysable N was stable. However, the proportion of total hydrolysable N in total soil N significantly decreased within 0-40 cm layers and remained stable below 40 cm. The content of four components significantly decreased within 0-40 cm, slightly decreased within 40-80 cm and remained stable below 80 cm. The percentage of organic N components in total hydrolysable N differed among soil types: amino acid-N (39.5%)＞ammonia N(32.3%)＞HUN fraction(25.7%)＞amino sugar-N(2.5%) in Ust-Sandiic Entisols; amino acid-N (36.0%)＞ammonia N (35.6%)＞HUN fraction (25.3%)＞amino sugar-N (3.1%) in Los-Orthic-Entisol; and ammonia N (50.6%)＞amino acid-N (29.0%)＞HUN fraction (17.5%)＞amino sugar-N (2.8%) in Eum-Orthic Anthrosol. Except amino sugar-N, all the soil organic N components within 0-40 cm in grassland were more than those in cropland; however, the inter-layer variation became smaller with the profiles.【Conclusion】From north to south of the Loess Plateau, the content of organic N and its different forms increased, the proportion of organic N component in total hydrolysable N was stable in the same layer under the same land-use patterns. However, the proportion of total hydrolysable N in total soil N decreased. Amino acid-N and ammonia N were the major forms of the soil organic N on the Loess Plateau. Land-use pattern had a great effect on the content and distribution of N. Both organic N and its components in grassland was more than that in cropland.

Key words: organic nitrogen components, profile, the Loess Plateau, distribution characteristics

DANG Ya-Ai, WANG Guo-Dong, LI Shi-Qing. The Changing Characteristics of Profile Distribution of Soil Organic Nitrogen Component of the Typical Soil Types on the Loess Plateau[J].Scientia Agricultura Sinica, 2011, 44(24): 5021-5030.

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