Recovery Role in Soil Structural, Carbon and Nitrogen Properties of the Conversion of Vegetable Land to Alfalfa Land in
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ORIGINAL PAPER
Recovery Role in Soil Structural, Carbon and Nitrogen Properties of the Conversion of Vegetable Land to Alfalfa Land in Northwest China Tiefeng Yu 1 & Fang Lin 1 & Xiaojing Liu 1 & Xiaowei Wang 2 Received: 7 November 2019 / Accepted: 27 February 2020 # Sociedad Chilena de la Ciencia del Suelo 2020
Abstract Soil structural, carbon (C), and nitrogen (N) properties could be influenced by land-use change. The objective of this study was to investigate the effects of the conversion from vegetable (Brassica pekinensis) planting for 7 years (2007–2014) to alfalfa (Medicago sativa L.) planting with 5 nitrogen levels (N0~N4) for 3 years (2015–2017) on soil structural, C, and N properties. After vegetable cultivation, soil structural, C, and N properties declined significantly. However, after alfalfa planting, especially in 2017, the lowest values of bulk density (N1 = 1.32 g m−3, N2 = 1.33 g m−3) and the highest values of macroaggregate proportion (N1 = 78.17%, N2 = 77.33%) were obtained. The highest values of SOC (N1 = 11.11 g kg−1, N2 = 11.08 g kg−1), SMBC (N1 = 390.97 mg kg−1), and sucrase (N1 = 17.47 mg g−1 d−1) were appeared. The maximum values of available nitrogen (N1 = 57.83 mg kg−1, N2 = 59.82 mg kg−1), SMBN (N1 = 56.01 mg kg−1, N2 = 58.14 mg kg−1), and urease (N2 = 2.71 mg g−1 d−1) were obtained. Taken together, our findings suggest that the conversion of vegetable land to alfalfa land with low N level could significantly improve soil structural, C, and N properties. Keywords Perennial crops . Vegetable crops . Soil fertility . Soil management . Soil quality
Abbreviations C Carbon SOC Soil organic carbon SMBC Soil microbial biomass C N Nitrogen SOM Soil organic matter SMBN Soil microbial biomass N
Tiefeng Yu and Fang Lin contributed equally to this work and should be considered co-first authors. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s42729-020-00218-w) contains supplementary material, which is available to authorized users. * Xiaojing Liu [email protected] 1
Pratacultural College, Gansu Agricultural University, Lanzhou, Gansu, China
2
Vegetable Research Institute, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu, China
1 Introduction Soil carbon (C) and nitrogen (N) contents are important indicators of soil ability to support agroecosystems productivity and resilience to environmental changes. Many soil properties (e.g., soil structural properties, C, and N properties) that affect agricultural productivity and ecosystem function are influenced by the soil C and N status (Lal 2002). In addition, soil C is often associated with major nutrients, especially N, and hence influences the cycling and availability of nutrients for crop and pasture production (Zhou et al. 2015). Appropriate land use and soil management can improve the soil quality (Zhou et al. 2015; Khan et al. 2019). It not only improves land productivity, but also regulates the balance of soil C and N, and improves surface soil structural properties (Lal 2002; Su 2007). V
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