土壤学报2012，Vol.49Issue(4)：740-747,8.
长期不同土地利用方式对潮棕壤有机氮组分及剖面分布的影响
EFFECT OF LONG-TERM LAND USE ON FRACTIONATION AND PROFILE DISTRIBUTION OF ORGANIC NITROGEN IN AQUIC BROWN SOIL
摘要
Abstract
Contents of fractions of organic nitrogen ( N ) in the soil profiles of fields that had been under different land uses(paddy field,upland and forestland) for 16 years were determined with the Bremner method. Results show that non-acidolysable N was the dominant fraction of organic N in all the three soils(0 ~ 60 cm in depth) ,and the contents of acido-lysable total N and acidolysable soil organic N fractions and their proportions to total N were, on the whole, the highest in surface soil(0 ~ 20 cm) . The content of acidolysable total N in 0 ~ 60 cm soil layer and contents of various acidolysable organic N fractions in 0 ~ 40 cm soil layer decreased with soil depth, but the proportions of acidolysable total N and various acidolysable organic N fractions to total N in 0 ~ 60 cm soil layer did not show any obvious regulations. Within the same soil depth,the paddy soil and the upland soil showed a similar regularity in contents of acidolysable total N and acidolysable soil organic N fractions and their proportions to total N, that is, unknown N > ammonia N > ami no acid N > amino sugar N,while the forest soil,did not show any obvious regularity in this aspect. Compared with paddy soil,upland soil and forest soil were more likely to increase the contents and their proportions to total N of acidolysable total N, acidolysable ammonia N,amino acid N and amino sugar N in the surface soil layer. In upland soil, the increase in acidolysable ammonia IV was more significant,while in forest soil,the increase in acidolysable amino acid N and acidolysable amino sugar N was. As a whole,when paddy field was turned into forest land,the increase in eadily decomposable acidolysable N was the most significant, thus indicating that its potential of increasing soil N supply is the highest.关键词
潮棕壤/土地利用方式/有机氮组分Key words
Aquic brown soil/Land use patterns/ Organic nitrogen fractions分类
农业科技引用本文复制引用
张玉玲,陈温福,虞娜,张玉龙,邹洪涛,党秀丽..长期不同土地利用方式对潮棕壤有机氮组分及剖面分布的影响[J].土壤学报,2012,49(4):740-747,8.基金项目
国家自然科学基金项目(41101276)、国家“973”项目子课题(2011CB100500)、公益性行业(农业)科研专项经费(nyhyzx07-001-01)和沈阳农业大学博士后基金项目资助 （41101276）
