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棕壤与褐土击实容重对含水量的响应
邱德勋1, 张含玉1, 姜自龙2, 刘前进1, 陈锦鸿1, 韩曜蔚1
1.临沂大学/山东省水土保持与环境保育重点实验室, 资源环境学院;2.临沂市兰山区住房和城乡建设局
摘要:
土壤在农业机械或者夯实压力下,容重会发生变化,其变化的程度受到土壤含水量的影响。为揭示棕壤与褐土受力后容重变化对含水量的响应特征,对土壤在不同的含水量下进行击实试验。结果表明:随着击实能量的增大,棕壤容重迅速增大后趋于稳定,而褐土容重达到稳定状态较慢。两种土壤容重随含水量的变化,因击实次数不同而具有差异性。棕壤容重随含水量增加,总体呈先增大后小幅度减小趋势,但在较低击实次数下,含水量为88.3 g/kg 时容重略微减小;褐土容重在击实次数较低时,随土壤含水量增加呈先减小后增大趋势,而在击实次数较高时,呈先减小后增大而后又减小趋势,在含水量136.5 g/kg 时出现最大值。含水量与击实能量对土壤击实容重的影响存在差异。在耕作条件(容重≤1.6 g/cm3)和工程条件(容重>1.6 g/cm3)下,影响棕壤击实容重的最主要因素分别为含水量和击实次数,而影响褐土击实容重的最主要因素均为击实次数。在耕作条件下,棕壤击实容重在较低含水量(<50 g/kg)下数值较低,且随击实次数增多,容重变化较小;褐土的较小容重出现在较低击实能量范围内(<90 kJ/m3),且受含水量的影响较小。在工程条件下,当棕壤与褐土的含水量为150 g/kg左右时,获得较大容重所需的击实能量最低。
关键词:  容重  含水量  击实  棕壤  褐土
DOI:10.13758/j.cnki.tr.2019.06.023
分类号:S152
基金项目:国家自然科学基金项目(41571261;41701311)、山东省自然科学基金项目(ZR2017JL019;ZR2017PD003)、山东省大学生创新创业训练计划项目(201710452021)资助。
Responses of Compacted Bulk Density of Brown Soil and Cinnamon Soil to Moisture Content
Qiu Dexun1, Zhang Hanyu1, Jiang Zilong2, Liu Qianjin1, Chen Jinhong1, Han Yaowei1
1.Linyi University/Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection, College of Resources and Environment;2.Lanshan Housing and Urban-Rural development bureau, Liny, Shandong
Abstract:
Bulk density is the basic physical property of soil. The variation of soil bulk density is affected by soil moisture under agricultural machinery or rammed pressure. In this study, compaction experiment was conducted to evaluate the characteristics of bulk density for brown soil and cinnamon soil under different moistures. The results showed that bulk density of brown soil increased rapidly first and then tended to be stable with the increase of compaction energy, but cinnamon soil reached the stable state slowly. The change of soil bulk density with moisture was different under different compaction times, for brown soil, bulk density increased firstly and then decreased slightly, but when the moisture was 88.3 g/kg bulk density was slightly decreased under less compaction times, while bulk density of cinnamon soil decreased first and then increased with the increase of soil moisture when the compaction times was relatively low. However, when the compaction times was more, bulk density decreased firstly and then increased and finally decreased again with the maximum value appeared at moisture of 136.5 g/kg. The effects of moisture and compaction energy on soil bulk density were different under tillage condition (≤1.6 g/cm3) and engineering condition (>1.6 g/cm3). The main factors influencing the compaction density of brown soil were moisture and compaction times, respectively, but for cinnamon soil only was compaction time. Under tillage condition, the compaction density of brown soil was lowest at low moisture (<50 g/kg), and changed little with the increase of compaction times. While the lowest bulk density of cinnamon soil appeared at the lower compaction energy (<90 kJ/m3), and was less affected by moisture. Under engineering condition, when the moisture was about 150 g/kg the compaction energy required to obtain larger bulk density was the lowest.
Key words:  Bulk density  Moisture content  Compaction  Brown soil  Cinnamon soil

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