Maize Straw Returning Approaches Affected Straw Decomposition and Soil Carbon and Nitrogen Storage in Northeast China

Autor:	Hongli Lian, Yehan Su, Zhengyu Wang, Yue Sun, Yingyan Wang, Ying Jiang, Hua Qi, Ping Tian, Pengxiang Sui, Guangxin Meng, Ziqi Ma
Rok vydání:	2019
Předmět:	animal structures SOC and STN stocks residue C and N release Chemistry food and beverages chemistry.chemical_element 04 agricultural and veterinary sciences Soil carbon 010501 environmental sciences Straw complex mixtures 01 natural sciences Decomposition Nitrogen straw decomposition Animal science crop residue incorporation 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Soil horizon Positive relationship Cycling Agronomy and Crop Science Carbon 0105 earth and related environmental sciences
Zdroj:	Agronomy Volume 9 Issue 12
ISSN:	2073-4395
DOI:	10.3390/agronomy9120818
Popis:	The characterization of straw decomposition and the resulting carbon (C) and nitrogen (N) release is crucial for understanding the effects of different straw returning methods on the immobilization and cycling of soil organic carbon (SOC) and soil total nitrogen (STN). In 2017&ndash 2018, a field micro-plot experiment was carried out in northeastern China to investigate the effects of different straw returning approaches on straw decomposition, C release, N release, SOC, STN, and the soil C&ndash N ratio. Six straw returning treatments were applied: straw mixed with soil (SM) and straw buried in the soil (SB) at soil depths of 10 (O), 30 (T), and 50 cm (F). The results indicate that the straw decomposition proportion (SD), C release, and N release in SM + O were higher than that in SM + T and SM + F. Moreover, SOC and STN concentrations and the soil C&ndash N ratio were significantly enhanced by SM/B + O in the 0&ndash 20 cm soil layers, SM/B + T in the 20&ndash 30 cm soil layer, and SM/B + F in the 40&ndash 60 cm soil layers. In the 0&ndash 50 cm soil profile, the highest SOC stocks were obtained using SB + T. The STN stocks were also significantly affected by the straw returning depth, but the effect was inconsistent between the two years. SD had a positive relationship with SOC and STN in the 0&ndash 20 cm soil layers conversely, they were negatively related in the 30&ndash 60 cm soil layers. The results of this study suggest that straw buried in the soil to a depth not exceeding 30 cm might be an optimal straw returning approach in northeastern China.
Databáze:	OpenAIRE
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