摘要
利用尼龙网袋法研究三尖叶猪屎豆、四棱豆、大叶千斤拔、马占相思、绒毛山蚂蝗和葛六种绿肥的施用对土壤交换盐基的动态影响。结果表明,施用绿肥均能够显著增加土壤的交换性盐基含量(对Na+作用不显著),表明施用绿肥能使土壤的保肥和缓冲能力增强,且均在绿肥施用后的前60 d效果最显著(K+在前30 d最显著),随后缓慢降低并逐渐接近于对照;6种绿肥中葛和绒毛山蚂蝗的Ca/K、Ca/Mg和(Ca+Mg)/SEB(交换性盐基总量)均显著高于对照,而K/SEB低于对照,说明绿肥对土壤交换性盐基比例关系的影响以交换性Ca的相对富集为主要特征;相关分析表明,土壤交换性Ca、Mg、K和SEB之间显著正相关,而与交换性Na、绿肥全Ca、全Mg、全K均无显著相关性。
The nylon bag method was used to study the dynamic effect of the application of six tropical leguminous green manures on the exchangeable base cations of latosol.The results showed that the incorporation of the green manures increased soil exchangeable base cations（Na＋ wasn’t significant）,suggesting that the green manures increased soil fertility and buffering capacity to acid.The greater increase in soil exchangeable base cations was observed during the initial 60 days after the application of green manures（exchangeable K＋ at 30 days）,and then the soil exchangeable base cations decreased gradually to near the status of exchangeable base cations in the control treatment.The ratios of Ca/K,Ca/Mg and（Ca＋Mg）/SEB for the treatment with Desmodium velutinum（Willd.）DC.Prodr and Pueraria lobata（Willd.）Ohwi in Bull added were significantly higher than that for the control,but the ratio of K/SEB was lower than the control,illustrating that the biggest effects of green manures on soil exchangeable Ca2＋ occurred.The correlation analysis showed that soil exchangeable Ca,Mg,K and SEB were significantly correlated with each other,but they were not correlated with exchangeable Na and the total amount of exchangeable Ca,Mg,K significantly.
出处
《热带作物学报》
CSCD
2011年第7期1282-1286,共5页
Chinese Journal of Tropical Crops
基金
国家自然科学基金项目(No.40961016)
海南省自然科学基金(No.410200)
农业部热带作物种质资源利用重点开放实验室基金(No.KFKT-2010-10)
现代农业产业技术体系建设专项基金
关键词
绿肥
砖红壤
交换性盐基
动态影响
Green manures
Latosol
Exchangeable base
Dynamic effect
