Nutrient Release from Weathering of Purplish Rocks in the Sichuan Basin, China

ZHU Bo; WANG Tao; YOU Xiang; GAO Mei-Rong

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Nutrient Release from Weathering of Purplish Rocks in the Sichuan Basin, China

机译：四川盆地紫色岩风化过程中的养分释放

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Purplish soils having high fertility with mineral nutrients inherited from the parent rock are widely distributed in the hills along the Yangtze River,especially in the Sichuan Basin.Pot and field weathering experiments were conducted to mimic rock weathering and nutrient release processes in order to better understand soil fertility and nutrient compensation.Three types of purplish rock formations formed in the Jurassic period,Shaximiao (J2s),Suining (J3s),and Penglaizhen (J3P),as well as one type formed in the Cretaceous period,the Chengqiangyan group (K1c),were used in this study.Results showed that the soil formation rate was in the range from 11.2 to 19.6 mm every year,and rock weathering was in the order ofJ3s ＞ J3P＞ J2s ＞ K1c.Because more rock surface was exposed to sunlight and rainfall in field conditions,pot weathering was slower than field weathering.Nutrient release rates increased with rock weathering and was in the order similar to that of rock weathering:J3p > J3s ＞ J2s＞ K1c.Potassium release was the most important in all rocks;after 2 years of weathering,19.4% to 46.9% of K was released from the initial parent rocks,which suggested that K release from weathering could meet most of the crop K requirement in purplish soils.Thus,rapid release of nutrients from weathering of purplish rocks was key to nutrient replenishment and fertility of purplish soils.

机译：紫色土具有丰富的肥沃土壤，其原生岩石中含有矿物质营养成分，分布在长江沿岸的丘陵地区，特别是四川盆地。为了模拟和研究岩石的风化和养分释放过程，进行了盆栽和田间风化实验，以更好地了解土壤肥力和养分补偿。侏罗纪时期形成的三种紫色岩层有沙溪庙（J2s），遂宁（J3s）和蓬莱镇（J3P），以及白垩纪形成的一种类型的成强岩群（K1c结果表明，每年土壤形成速率在11.2至19.6 mm范围内，岩石风化的顺序为J3s＞ J3P＞ J2s＞ K1c。因为更多的岩石表面暴露在阳光下养分释放速率随岩石风化的增加而增加，且与岩石风化的顺序相似：J3p> J3s＞ J2s＞钾的释放是所有岩石中最重要的;风化2年后，初始母体岩石释放了19.4％至46.9％的钾，这表明风化释放的钾可以满足大部分作物对紫色钾的需求因此，紫色岩石风化过程中养分的快速释放是紫色土壤养分补充和肥力的关键。

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来源
《土壤圈（英文版）》 |2008年第2期|257-264|共8页
作者
ZHU Bo; WANG Tao; YOU Xiang; GAO Mei-Rong;
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作者单位

Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610041 (China);

Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610041 (China);

Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610041 (China);

Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610041 (China);

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收录信息中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
原文格式 PDF
正文语种 chi
中图分类农业基础科学;
关键词
nutrient release,purplish rock,soil formation,weathering;

机译：养分释放;紫色岩石;土壤形成;风化;

Nutrient Release from Weathering of Purplish Rocks in the Sichuan Basin, China

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