水分状况对红壤水稻土中有机物料碳分解和分布的影响

被引：27

作者：

江春玉 ^{[1
]}

李忠佩 ^{[1
,2
]}

崔萌 ^{[1
,2
]}

车玉萍 ^{[1
]}

机构：

[1] 土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所)

[2] 中国科学院大学

来源：

土壤学报 | 2014年 / 51卷 / 02期

关键词：

水分状况; 红壤水稻土; 有机物料碳; 分解速率; 腐殖质;

D O I：

暂无

中图分类号：

S153.6 [土壤成分];

学科分类号：

090301 [土壤学];

摘要：

以室内模拟的方法研究了好气、淹水和干湿交替3种水分条件下有机物料碳在红壤水稻土中分解和分布的差异。试验结果表明,干湿交替条件下有机物料的分解速率最高,好气条件下次之,淹水条件下较低。好气和淹水条件下添加物料促进土壤原有有机碳的矿化,产生正激发效应,而干湿交替条件显著抑制了土壤原有有机碳的矿化,呈负激发效应,随着培养时间的延长激发效应减弱。干湿交替条件下添加有机物料处理的土壤胡敏酸(Humic acid,HA)色调系数和E4/E6比值显著低于淹水和好气条件,淹水培养使土壤胡敏酸的结构简单化,干湿交替使胡敏酸芳构化和腐殖化程度增加,结构复杂化。有机物料碳在土壤腐殖质组分中的分配比例显示,干湿交替和好气条件促进了胡敏酸的形成,提高了土壤原有富里酸(Fulvic acid,FA)组分的转化和胡敏酸组分的分解;淹水条件下物料碳在富里酸组分中分布比例较高,且抑制了土壤原有胡敏酸组分的分解。有机物料碳在>0.053 mm粒级团聚体中分布比例较大,干湿交替和淹水条件下更为明显。

引用

页码：325 / 334

页数：10

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