Effect of long-term fertilization on soil aggregate-associated dissolved organic nitrogen on sloping cropland of purple soil
文献类型： 外文期刊
作者： Hua, K. K. 1 ; Zhu, B. 2 ; Wang, X. G. 2 ; Guo, X. S. 1 ; Wang, D. Z. 1 ; Guo, Z. B. 1 ;
作者机构： 1.Anhui Acad Agr Sci, Soil & Fertilizer Res Inst, Hefei, Peoples R China
2.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Processes & Ecol Regulat, Chengdu, Peoples R China
关键词： cropland;mineral fertilizer;manure;crop straw;microbial biomass
期刊名称：PLANT SOIL AND ENVIRONMENT （ 影响因子：1.799； 五年影响因子：2.169 ）
ISSN： 1214-1178
年卷期： 2014 年 60 卷 2 期
页码：
收录情况： SCI
摘要： To investigate the effect of fertilization practice on dissolved organic nitrogen (DON) in aggregates, the study was conducted and involved four fertilization treatments: no fertilizer; mineral fertilizer (MF); pig manure matched with mineral fertilizer (MFP) and crop straw matched with mineral fertilizer (MFR). The results showed that DON content and storage were the highest in > 5 mm aggregates and were the lowest in < 0.25 mm aggregates. Compared with MF, MFP and MFR significantly increased DON contents in > 5 mm by 404.7% and 184.4%. In comparison with MFR, DON content and storage in > 5 mm aggregates for MFP were significantly enhanced by 77.5% and 75.0%. A significantly positive linear correlation relationship between DON content and microbial biomass carbon content was observed in aggregates (R-2 = 0.84; P < 0.01). The results suggest that pig manure matched with mineral fertilizer is a preferred strategy for retaining DON nutrient due to enhanced microbial biomass in aggregates on sloping upland of purple soil.
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