Integrated management systems and N fertilization: effect on soil organic matter in rice-rapeseed rotation |
| |
Authors: | Jing Tian Shihua Lu Mingsheng Fan Xiaolin Li Yakov Kuzyakov |
| |
Institution: | 1. Key Laboratory of Plant-Soil Interactions, Ministry of Education; and College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China 3. Department of Soil Science of Temperate Ecosystems, University of G?ttingen, 37077, G?ttingen, Germany 2. Institute of Soils and Fertilizers, Sichuan Academy of Agricultural Sciences, Chengdu, 610066, China
|
| |
Abstract: | Aims Understanding the effects of long-term crop management on soil organic matter (SOM) is necessary to improve the soil quality and sustainability of agroecosystems. Method The present 7-year long-term field experiment was conducted to evaluate the effect of integrated management systems and N fertilization on SOM fractions and carbon management index (CMI). Two integrated soil-crop system management (ISSM-1 and ISSM-2, combined with improved cultivation pattern, water management and no-tillage) were compared with a traditional farming system at three nitrogen (N) fertilization rates (0, 150 and 225 kg N ha?1). Results Management systems had greater effects on SOM and its fractions than did N fertilization. Compared with traditional farming practice, the integrated management systems increased soil organic carbon (SOC) by 13 % and total nitrogen (TN) by 10 % (averaged over N levels) after 7 years. Integrated management systems were more effective in increasing labile SOM fractions and CMI as compared to traditional farming practice. SOC, TN and dissolved organic matter in nitrogen increased with N fertilization rates. Nonetheless, N addition decreased other labile fractions: particulate organic matter, dissolved organic matter in carbon, microbial biomass nitrogen and potassium permanganate-oxidizable carbon. Conclusions We conclude that integrated management systems increased total SOM, labile fractions and CMI, effectively improved soil quality in rice-rapeseed rotations. Appropriate N fertilization (N150) resulted in higher SOC and TN. Though N application increased dissolved organic matter in nitrogen, it was prone to decrease most of the other labile SOM fractions, especially under higher N rate (N250), implying the decline of SOM quality. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|