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

查看全文 作　　者：ZHU Bo WANG Tao YOU Xiang GAO Mei-[1]Rong

机构地区：[1]Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041 (China)

出　　处：《Pedosphere》索引2008年第18卷第2期,共8页

基　　金：the National Basic Research Program of China(No.2003CB415202);the National Natural Science Foundation of China(Nos.40571093 and 49601009) 摘　　要：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(J_2s),Suining(J_3s),and Penglaizhen (J_3p),as well as one type formed in the Cretaceous period,the Chengqiangyan group(K_1c),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 of J_3s>J_3p>J_2s>K_1c.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:J_3p>J_3s>J_2s>K_1c.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. 关键词：土壤岩石风化作用养分流失

相关文献

参考文献（25）
引证文献（19）
耦合文献（0）

参考文献(25)

引证文献(19)

互联网出版许可证新出网证(渝)字10号全国400电话 - 免长途话费

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

参考文献(25)

引证文献(19)

用户提示