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Compounding soils to improve cropland quality:A study based on field experiments and model simulations in the loess hilly-gully region,China

引用

Journal of Mountain Science 2022年第10期19卷 2776-2790页

作者： HUANG Yun-xin LIU Zheng-jia LIU Yan-sui LI Yu-rui LIU Xue-qi Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 101408China National Observation and Research Station of Earth Critical Zone on the Loess Plateau in Shaanxi Xi'an 710061China Faculty of Geographical Science Beijing Normal UniversityBeijing 100875China

Increasing the quantity and improving the quality of cropland can alleviate the human-land contradiction and promote the sustainable development of agriculture especially in mountainous *** the support of the central government’s policies,Yan’an,Northern Shaanxi,China implemented a major land consolidation engineering project in the loess hilly-gully region from 2013 to 2018,achieving 33,333.3 ha of new ***,the poor quality of some newly-constructed cropland at the initial stage hindered its efficient *** order to overcome this problem,red clay and Malan loess were compounded in different volume ratios to explore the method to improve the cropland *** Root Zone Water quality Model was used to simulate the effects of different soil treatments on soil water,nitrogen and maize *** data were collected from 2018 to 2019 to calibrate and validate the *** root mean square error(RMSE)of soil water content,nitrate nitrogen concentration,above-ground biomass,leaf area index were in the range of 11.72-14.06 mm,4.06-11.73 mg kg^(-1),835.21-1151.28 kg ha^(-1)and 0.24-0.47,respectively,while the agreement index(d)between measured and simulated values ranged from 0.70 to *** was showed that,compared with land constructed with Malan loess only(T1),the soil structure and hydraulic characteristics of land with a volume ratio of red clay and Malan loess of 2:1(T3)was *** indicated that,compared with T1,the soil water content and available water content of T3 increased by 14.4%and 19.0%,respectively,while N leaching decreased by 16.9%.The aboveground biomass and maize yield of T3 were 7.9%and 6.7%higher than that of T1,***,the water productivity and nitrogen use efficiency of T3 increased by 21.0%and 16.6%compared with that of *** results indicated that compounding red clay and Malan loess in an appropriate ratio was an effective method to improve soil *** study provides a

关键词： Soil reconstruction Soil quality Land consolidation engineering high-quality cropland Loess hilly-gully region Root Water quality Model

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