Soil fragmentation properties as influenced by induced compaction in Asian clayey hydragric anthrosols conditions

Gaoming Xu, Xiaoyu Zhang, Yixuan Xie, Tingfeng He, Lianfei Huo, Shuguang Hou, Haoqi Chen, Qishuo Ding
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Abstract

Compaction of clayey hydragric anthrosols (paddy soil) caused by field traffic can seriously jeopardize the sustainability of intensive rice–wheat rotation systems. This study aimed to investigate the effect of applied stress and compaction times on the soil fragmentation properties for Asian clayey hydragric anthrosols. A specific in situ soil sinkage test bench was used to quantitatively simulate various types of wheel traffic. Experimental treatments included no compaction (control), and 20 combinations of five different applied stresses (50, 100, 150, 200, and 300 kPa) and four different compaction cycles (1, 3, 6, and 12). Intact soil cores with a diameter of 100 mm and a height of 100 mm at depths of 0–100 and 100–200 mm were collected for drop-shatter testing. Three soil fragmentation state parameter indicators, including mean weight diameter (MWD), specific surface area (SSA), and mass fractal dimension (MFD), were measured. With the increase of applied stress and compaction cycles, the MWD of hydragric anthrosols for 0- to 100-mm and 100- to 200-mm soil layers gradually increases, and the SSA and MFD gradually decrease. Referring to the definition of the soil compression curve, we propose a soil fragmentation curve to characterize soil fragmentation behavior and a pre-compression stress of soil structures to represent the bearing capacity that does not affect soil fragmentation. Soil drop-shatter tests also indicated that soil compaction increased soil tillage energy consumption. For 0- to 100-mm and 100- to 200-mm soil layers, the pre-compression stress of soil structures based on MWD, SSA, and MFD is basically the same, and the average coefficient of variation is 3.86% and 5.64%, respectively. This result indicates that the value of pre-compression stress of soil structures by using the soil fragmentation state parameters is very stable. It can be used for prediction of soil compaction risks of clayey hydragric anthrosols affecting soil fragmentation.

亚洲黏性水文人类活动条件下诱导压实对土壤破碎化特性的影响
农田交通造成的粘质水化土(水稻土)压实会严重危及水稻-小麦集约轮作系统的可持续性。本研究旨在探讨施加应力和压实时间对亚洲黏性水合人类土壤破碎化特性的影响。采用专门的原位土壤沉降试验台,对不同类型的车轮交通进行了定量模拟。试验处理包括不压实(对照),5种不同的施加应力(50、100、150、200和300 kPa)和4种不同的压实周期(1、3、6和12)的20种组合。收集0 ~ 100 mm和100 ~ 200 mm深度、直径为100 mm、高度为100 mm的完整土芯进行落锤破碎试验。测量了土壤破碎化状态参数指标,包括平均重径(MWD)、比表面积(SSA)和质量分形维数(MFD)。随着外加应力和压实循环次数的增加,0 ~ 100 ~ 100 mm和100 ~ 200 mm土层的水合人类活动的MWD逐渐增大,SSA和MFD逐渐减小。参考土壤压缩曲线的定义,我们提出了表征土壤破碎化行为的土壤破碎化曲线和表征不影响土壤破碎化的土壤结构承载力的土壤结构预压应力。土壤落碎试验也表明,土壤压实增加了土壤耕作能耗。对于0 ~ 100 mm和100 ~ 200 mm土层,基于MWD、SSA和MFD的土体结构预压应力基本相同,平均变异系数分别为3.86%和5.64%。这表明,利用土壤破碎状态参数计算的土结构预压应力值是非常稳定的。该方法可用于预测黏性水力活动对土壤破碎化影响的土壤压实风险。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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