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

作　　者：HUANG Yun-xin LIU Zheng-jia LIU Yan-sui LI Yu-rui LIU Xue-qi 

机构地区：[1]Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China [2]College of Resources and Environment,University of Chinese Academy of Sciences,Beijing 101408,China [3]National Observation and Research Station of Earth Critical Zone on the Loess Plateau in Shaanxi,Xi'an 710061,China [4]Faculty of Geographical Science,Beijing Normal University,Beijing 100875,China

出　　处：《Journal of Mountain Science》2022年第10期2776-2790,共15页山地科学学报（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant No.41931293);the National Key Research and Development Program of China(Grant No.2017YFC0504701)。

摘　　要：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 areas.With 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 cropland.However,the poor quality of some newly-constructed cropland at the initial stage hindered its efficient utilization.In order to overcome this problem,red clay and Malan loess were compounded in different volume ratios to explore the method to improve the cropland quality.The Root Zone Water Quality Model was used to simulate the effects of different soil treatments on soil water,nitrogen and maize growth.Experimental data were collected from 2018 to 2019 to calibrate and validate the model.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 0.96.It 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 better.Simulation 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,respectively.Furthermore,the water productivity and nitrogen use efficiency of T3 increased by 21.0%and 16.6%compared with that of T1.These results indicated that compounding red clay and Malan loess in an appropriate ratio was an effective method to improve soil quality.This study provides a technical idea and specific technical parame

关 键 词：Soil reconstruction Soil quality Land consolidation engineering High-quality cropland Loess hilly-gully region Root Water Quality Model 

分 类 号：S156[农业科学—土壤学]