羧甲基纤维素钠对土壤团粒结构及水分运动特性的影响

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	羧甲基纤维素钠对土壤团粒结构及水分运动特性的影响
	吴军虎 ; 陶汪海 ; 王海洋 ; 王全九
刊名	Transactions of the Chinese Society of Agricultural Engineering(农业工程学报)
	2015-01-15
通讯作者邮箱	wujunhu@126.com
卷号	31 期号:2 页码:117-123
关键词	土壤水分(moisture) 土壤改良剂(soil conditioners) 羧甲基纤维素钠(sodium carboxyl methyl cellulose) 团粒结构(aggregate structure) 分形维数(fractal dimension)
其他题名	Influence of sodium carboxyl methyl cellulose on soil aggregate structure and soil water movement
通讯作者	吴军虎
中文摘要	土壤改良剂的应用研究对改善土壤环境，促进作物生长有着重要意义。该文通过向土壤中添加不同质量的羧甲基纤维素钠（ sodium carboxyl methyl cellulose，简称 CMC），研究了不同含量的 CMC 对土壤团粒结构及水分运动的影响。结果表明：随着 CMC 含量的增大，土壤水稳性团聚体含量增大，土壤分形维数减小，土壤黏粒和粉粒比例减少，砂粒比例增多，黏粒和粉粒均与土壤分形维数呈正相关关系，砂粒与分形维数呈负相关关系，黏粒含量对土壤分形维数影响最为显著，土壤中＜0.1 mm 的颗粒含量减少，而≥0.1 mm 的颗粒含量均有不同程度的增加；随 CMC 含量的增大，土壤的入渗能力减弱，稳定入渗率显著减小， Philip 公式中吸渗率减小， Kostiakov 公式中的经验系数减小，经验指数增大；随着 CMC 含量的增大，土壤的持水能力增强， van Genuchten 公式中土壤滞留含水率、饱和含水率及与进气值相关的系数均有所增大，形状系数逐渐减小。该研究对可为 CMC 的田间土壤改良应用提供理论依据。
英文摘要	Soil amendment agent plays important role in improving soil structure and enhancing crop growth. Sodium carboxyl methyl cellulose (CMC) is anion linear polymer cellulose ether， which is odorless, tasteless and nontoxic. It is regarded as an effective soil amendment agent because of its strong water absorption capacity. In this paper, a laboratory study was carried out to investigate the influence of sodium carboxyl methyl cellulose on soil aggregate structure and soil water movement in the soil columns by respectively adding 0, 0.5, 1.0, 1.5, 2.0, 2.5 and 3.0 g CMC into each 1 000 g soil collected from Changwu agro-ecological experiment station in the loess plateau. The results indicated that water stable aggregate content increased from 3.36% to 15.05%, and the soil fractal dimension reduced from 2.53 to 2.37 with increasing CMC content. In the meantime, clay content reduced from 3.47% to 0.84%, silt content reduced from 86.19% to 61.27%, but sand content increased from 10.35% to 37.89%. Clay and silt contents were negatively correlated with soil fractal dimension, and sand content was positively correlated with soil fractal dimension. The influence of clay content was most significant on soil fractal dimension. The content of soil particle less than 0.1 mm reduced from 85.59% to 48.41%, but the content of soil particle between 0.1 and 0.2 mm, 0.2 and 0.3 mm, 0.3 and 0.4 mm, 0.4 and 0.5 mm, 0.5 and 0.6 mm increased from 9.53% to 22.56, 2.14% to 10.99%, 1.31% to 6.69%, 0.84% to 4.31%, 0.43% to 2.81% respectively, and the content of soil particle larger than 0.6 mm increased slightly. The relationship between water stable aggregate content, soil fractal dimension, clay content, silt content, sand content and CMC content followed quadratic function (R2≥0.95, P≤2.92×10-3). The relationship between clay content, silt content, sand content and soil fractal dimension followed linear function (R2≥0.95, P≤1.85×10-6). The soil infiltration capacity and the stable infiltration rate reduced with increasing CMC content. The cumulative infiltration volume reduced from 14.36 cm to 3.28 cm after 700 minutes. The stable infiltration rate reduced from 0.0150 to 0.0028 cm/min, and the relationship between stable infiltration rate and CMC content followed linear function (R2=0.96, P=2.99×10-6). Infiltration rate in Philip formula reduced from 0.46 to 0.13, the empirical coefficient K in Kostiakov formula reduced from 0.29 to 0.16, but the exponent increased from 0.41 to 0.53. Soil water retention capacity was enhanced with the increasing CMC content. The residual water content, saturated water content and coefficient associated with intake value in van Genuchten formula were increased, but the shape coefficient decreased with increasing CMC content. The residual water content increased from 0.12 to 0.14, saturated water content increased from 0.42 to 0.46, coefficient associated with intake value increased from 0.0031 to 0.0054 and shape coefficient reduced from 1.75 to 1.40. The results suggested that CMC can hinder water movement by reacting with water to form gel and then the smaller soil particles can be combined into the bigger soil aggregates. In conclusion， CMC additions agent could change soil structure and decrease soil infiltration capacity effectively. This study may provide valuble information for the application of CMC in soil improvement.
分类号	S152.4； S152.7(中图分类号)
收录类别	EI
语种	中文
内容类型	期刊论文
源URL	[http://ir.iswc.ac.cn/handle/361005/7730]
专题	水土保持研究所_水保所科研产出（EI）_2015年EI
作者单位	1.中科院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室，杨陵 712100 2.西安理工大学西北旱区生态水利工程国家重点实验室培育基地，西安 710048
推荐引用方式 GB/T 7714	吴军虎,陶汪海,王海洋,等. 羧甲基纤维素钠对土壤团粒结构及水分运动特性的影响[J]. Transactions of the Chinese Society of Agricultural Engineering(农业工程学报),2015,31(2):117-123.
APA	吴军虎,陶汪海,王海洋,&王全九.(2015).羧甲基纤维素钠对土壤团粒结构及水分运动特性的影响.Transactions of the Chinese Society of Agricultural Engineering(农业工程学报),31(2),117-123.
MLA	吴军虎,et al."羧甲基纤维素钠对土壤团粒结构及水分运动特性的影响".Transactions of the Chinese Society of Agricultural Engineering(农业工程学报) 31.2(2015):117-123.