Effect of organic matter on CEC due to permanent and variable charges in selected temperate region soils

环境科学 土壤有机质 土壤pH值 环境化学 土工试验 阳离子交换容量 底土 土壤类型 土壤碳 农学
作者
K. H. Tan,P.S. Dowling
出处
期刊:Geoderma [Elsevier BV]
卷期号:32 (2): 89-101 被引量:33
标识
DOI:10.1016/0016-7061(84)90065-x
摘要

Cation exchange capacities due to permanent charges (CECp) and variable charges (CECv) and at pH 8.2 (CECt) were determined in soil samples before and after removal of organic matter with H2O2 to study the effect of interactions between organic matter and clay on the different types of CEC. Five soils with differing organic matter contents and different clay mineralogies were selected and used, e.g. Dubuque, Tubac, Tama, Greenville and Houston Black series. The results indicated that the lowest CECp (2.9 mequiv./100 g soil) was detected in the Ap horizon of Greenville soil with a low organic matter content and kaolinitic mineralogy. The highest CECp (11.3 mequiv./100 g soil) in the A horizon was measured in the Houston Black soil also with low organic matter content but which contained montmorillonitic clay. Dubuque, Tubac and Tama A horizons, with mixed mineralogy, had CECp values (4.6–6.5 mequiv./100 g soil) between those exhibited by the Greenville and Houston Black soils. After removal of organic matter, the CECp of the Houston Black soil increased in value, indicating that the permanent charge of the montmorillonitic clay has been blocked by the interaction of the organic matter with the clay. This interaction between two soil components causing a decrease in CECp is known in plant science as antagonism. On the other hand, removal of organic matter from soils with mixed mineralogy resulted in a decrease in CECp. The interactions between organic matter and clay in these soils yielded clay—organic complexes with a synergistic effect on permanent charges, which produced the higher CECp values. In the Greenville Ap horizon, destruction of organic matter had no effect on CECp. Based on absolute values, the A horizons of the soils had low CECv's, with the Houston Black exhibiting relatively the highest value (24.0 mequiv./100 g soil). The Ap horizon of the Greenville soil had a CECv (6.7 mequiv./100 g soil), which was 3.5 times smaller than that of the A1p horizon of the Houston Black soil. When the percentage of the CECv contributing to the CECt was studied, however, it appeared that in the Greenville Ap horizon 70% of the CECt was attributed to the CECv, compared to 68% in the Houston Black A1p horizon. The conclusion was made that variable charges were equally prominent in the soils studied. In the absence of organic matter, %CECv in the A
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
Yong-AI-BUPT完成签到,获得积分10
1秒前
júpiter完成签到,获得积分10
2秒前
qiaoxi完成签到,获得积分10
2秒前
2秒前
cuddly完成签到 ,获得积分10
3秒前
mzrrong完成签到 ,获得积分10
4秒前
酢浆草小熊完成签到 ,获得积分10
5秒前
mcl发布了新的文献求助10
7秒前
chun完成签到 ,获得积分10
8秒前
顺利的曼寒完成签到 ,获得积分10
10秒前
firewood完成签到,获得积分10
14秒前
hh完成签到 ,获得积分10
14秒前
与一完成签到 ,获得积分10
14秒前
fomo完成签到,获得积分10
15秒前
OO圈圈完成签到,获得积分10
18秒前
yellow完成签到 ,获得积分10
18秒前
犹豫的若完成签到,获得积分10
19秒前
暮雪残梅完成签到 ,获得积分10
20秒前
海意完成签到,获得积分10
20秒前
大力的诗蕾完成签到 ,获得积分10
20秒前
松柏完成签到 ,获得积分10
21秒前
帆帆帆完成签到 ,获得积分10
22秒前
一只鲨呱完成签到,获得积分10
28秒前
Marshall完成签到 ,获得积分10
32秒前
尊敬秋双完成签到 ,获得积分10
36秒前
不爱吃鱼的猫完成签到,获得积分10
38秒前
月亮完成签到 ,获得积分10
38秒前
影像大侠完成签到,获得积分10
40秒前
踢球的孩子完成签到 ,获得积分10
42秒前
美丽的鞋垫完成签到 ,获得积分10
45秒前
nusiew完成签到,获得积分10
45秒前
tonydymt完成签到 ,获得积分10
46秒前
chenying完成签到 ,获得积分0
47秒前
mojomars完成签到,获得积分10
47秒前
TiY完成签到 ,获得积分10
48秒前
49秒前
zoe完成签到 ,获得积分10
51秒前
蓝意完成签到,获得积分0
53秒前
59秒前
雪白发卡完成签到,获得积分10
1分钟前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
Cognitive Neuroscience: The Biology of the Mind 1000
Technical Brochure TB 814: LPIT applications in HV gas insulated switchgear 1000
Immigrant Incorporation in East Asian Democracies 600
Nucleophilic substitution in azasydnone-modified dinitroanisoles 500
不知道标题是什么 500
A Preliminary Study on Correlation Between Independent Components of Facial Thermal Images and Subjective Assessment of Chronic Stress 500
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3968578
求助须知:如何正确求助?哪些是违规求助? 3513391
关于积分的说明 11167428
捐赠科研通 3248822
什么是DOI,文献DOI怎么找? 1794499
邀请新用户注册赠送积分活动 875116
科研通“疑难数据库(出版商)”最低求助积分说明 804664