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作物根系对农田土壤干缩开裂影响的试验分析 被引量:3

Experimental Analysis of the Effects of Crop Root System on Farmland Soil Desiccation Cracking
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摘要 为探究农田中作物根系对土壤干缩开裂行为的影响,对根系作用及无根系作用下的农田土壤进行了自然干缩开裂试验,讨论了根系作用及无根系作用下土壤干缩裂隙的发育规律,分析了根系对土壤干缩裂隙形态及其Minkowski密度的影响。结果表明:相比无根系影响的土壤,根系影响下的土壤干缩裂隙在根系附近裂隙发育程度较低,裂隙宽度、单个裂隙长度及团聚体面积较小,而在远离根系位置呈现与无根系影响下土壤干缩裂隙相似的形态特征;作物根系使得干缩裂隙的Minkowski密度显著降低,相比无根系作用的农田土壤干缩裂隙,6株玉米根系存在时面积密度m_(0)平均降低31%,长度密度m_(1)平均降低19%,欧拉数密度m_(2)平均降低20%;综上所述,作物根系对土壤干缩开裂存在明显的抑制作用,分析指出根系对干缩开裂的影响主要体现在局部增大土壤抗拉强度及限制土壤材料移动两个方面。 In order to explore the effect of crop roots on soil desiccation cracking behavior in farmland,the natural desiccation cracking experiments of farmland soil under the effect of roots and without roots was carried out,and the development law of soil desiccation cracks under the effect of roots and without roots was discussed.Also the effects of crop roots on soil desiccation crack morphology and Minkowski density were analyzed.The results showed that compared with the soil without root influence,the degree of soil desiccation cracks near the root was lower,the width of the cracks,the length of a single crack and the area of aggregates were smaller,and the morphological characteristics of soil desiccation cracks far away from the root were similar to those of the soil without root influence.Crop roots significantly reduced the Minkowski density of desiccation cracks.Compared with the desiccation cracks in farmland without roots,the area density(m_(0)),length density(m_(1))and Euler number density(m_(2))of the six maize roots decreased by 31%,19% and 20% on average when the roots were present.In conclusion,crop roots have obvious inhibition effect on soil desiccation cracking.The effects of roots on soil desiccation cracking are mainly reflected in two aspects of locally increasing soil tensile strength and restricting soil material movement.
作者 申同庆 李株丹 刘登川 朱磊 SHEN Tong-qing;LI Zhu-dan;LIU Deng-chuan;ZHU Lei(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China;Engineering Research Center for Efficient Utilization of Modern Agricultural Water Resources in Arid Regions,Ministry of Education,Yinchuan 750021,China)
出处 《节水灌溉》 北大核心 2021年第7期41-45,共5页 Water Saving Irrigation
基金 宁夏自然科学基金项目(2020AAC03040) 国家自然科学基金项目(51879134)。
关键词 根系 开裂 干缩裂隙 Minkowski密度 root system cracking desiccation crack Minkowski density
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