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标题：Integrated use of straw mulch with nitrogen fertilizer improves soil functionality and soybean production
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作者：Kashif Akhtar ; Weiyu Wang ; Guangxin Ren 等
期刊名称：Environment International
印刷版ISSN：0160-4120
电子版ISSN：1873-6750
出版年度：2019
卷号：132
页码：1-10
DOI：10.1016/j.envint.2019.105092
语种：English
出版社：Pergamon
摘要：AbstractMulching can effectively maintain and improve soil health and functionality. The mechanisms, however, have not been fully elucidated. Therefore, the effects of temperature on the biogeochemical properties of soil were investigated in the present study in relation to nitrogen management and soil functionality. The results of the 3-year field experiments showed that integrated straw mulch (S) and nitrogen fertilizer (N) treatments enhanced the activities of soil urease, invertase, alkaline phosphatase, and catalase by >1.8, 2.1, 2.0 and 1.4 fold, respectively, compared with the control treatment. Furthermore, these treatments increased soil available N by 28%, phosphorus by 45%, and potassium by 55%. In general, the soil organic carbon, dissolved carbon and labile organic carbon content in the treated plot were approximately 1.2–2.9 folds greater than in the control plot. These improvements in soil fertility and carbon indices increased the biomass and grain yield of soybean (67 and 75%, respectively) during the three-year study period. During 2015–2017, the straw mulch and nitrogen fertilizer treatment increased the soil moisture (23%) and decreased the soil temperature (8%) in comparison to the control in the 0–0.2 m soil depth and, therefore, improved soil enzyme activities, nutrient availability, and carbon stocks, and ultimately, soil functionality and sustainability, in the semiarid region.Graphical abstractDisplay OmittedHighlights•Integrated use of straw mulch with nitrogen fertilizer improved soil carbon pool.•S + N regime improved soil nutrients and soil water content in 0–0.4 m soil layer.•S + N treatments significantly decreased the soil temperature.•Soil enzyme activities were positively correlated with nutrient dynamics.•Soybean yield was significantly enhanced by straw mulch with nitrogen fertilizer.
关键词：Soil hydrothermal properties;Nutrient availability;Enzyme activities;Soil carbon