文献类型： 外文期刊

作者： Han, Guang-Zhong ¹ ; Huang, Lai-Ming ² ; Tang, Xian-Gan ⁴ ;

作者机构： 1.Neijiang Normal Univ, Sch Geog & Resources Sci, Lab Simulat Soil Proc, Neijiang 641112, Sichuan, Peoples R China

2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China

3.Univ Chinese Acad Sci, Coll Resource & Environm, Beijing 100049, Peoples R China

4.Jiangxi Acad Agr Sci, Natl Engn & Technol Res Ctr Red Soil Improvement, Nanchang 330200, Jiangxi, Peoples R China

关键词： Chronosequence; Illite; Muscovite; Potassium supply capacity; Purple paddy soils

期刊名称：JOURNAL OF SOILS AND SEDIMENTS （ 影响因子：3.308； 五年影响因子：3.586 ）

ISSN： 1439-0108

年卷期： 2019 年 19 卷 3 期

页码：

收录情况： SCI

摘要： PurposePurple paddy soils are important for food production. Their potassium (K) supply capacity affects rice yields through its effect on nutrient availability. We hypothesize that changes in soil mineralogy can influence the K supply capacity and the efficiency of K fertilizer. Designing management practices that optimize crop yield while minimizing environmental impacts is a major challenge in agriculture. For this, it is necessary to understand the evolution of, and interaction of, minerals and different chemical forms of K in the soil system.Materials and methodsTaking advantage of the long-term paddy cultivation history in China, two purple paddy soil chronosequences, one in Guang'an, Sichuan Province (P sequence) and the other in Longsheng, Guangxi Autonomous Region (PS sequence) in Southwest China, were investigated.Results and discussionDepotassification is prevalent in both paddy soil chronosequences, which is consistent with the decrease of illite and K-feldspar in the P sequence and with the decrease of muscovite in the PS sequence. K-bearing primary minerals are the long-term stable source of non-exchangeable K (interlayer K) in both chronosequences. Illite in clay fractions acts as the main sources of non-exchangeable K in the P sequence. In contrast, clay minerals derived from muscovite are the main sources of non-exchangeable K in the PS sequence. Clay mineral authigenesis is an important process in the purple paddy soils rich in K-bearing minerals.ConclusionsThe changes in mineralogy of purple paddy soils do not conform to the usual sequence found in the well-drained natural soils. Artificial submergence promotes the conversion of mineral K (lattice-bound K) to non-exchangeable K and enhances the availability of mineral K. The disintegration of K-bearing primary minerals thus controls the K supply capacity in purple paddy soils.