广东耕地土壤速效钾变化趋势及影响因素分析
通过长期定位监测数据，对1984年后的广东耕地土壤速效钾变化进行分析。结果表明：1984年以来，全省耕地土壤速效钾含量总体水平增加了近1倍，年平均增加1．8mg／kg，全省监测点速效钾含量属于中上水平（大于100mg／kg）的频率由“七五前”的10．1％上升到“十二五”期间的38．4％，提高幅度超过28．3％，而属于低水平（小于100mg／kg）的频率在相同时期内则由89．9％下降到61．5％，全省土壤速效钾整体仍处于较缺乏水平；不同区域的耕地土壤速效钾增加速率明显不同，其中珠三角地区速效钾含量增加76mg／kg，增幅为155％，年平均增加2．6mg／kg，明显高于其他区域。施用钾肥是耕地土壤...
Saved in:
| Published in | 广东农业科学 Vol. 42; no. 16; pp. 32 - 36 |
|---|---|
| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
广东省耕地肥料总站,广东广州,510500
2015
|
| Subjects | |
| Online Access | Get full text |
Cover
Loading…
| Summary: | 通过长期定位监测数据，对1984年后的广东耕地土壤速效钾变化进行分析。结果表明：1984年以来，全省耕地土壤速效钾含量总体水平增加了近1倍，年平均增加1．8mg／kg，全省监测点速效钾含量属于中上水平（大于100mg／kg）的频率由“七五前”的10．1％上升到“十二五”期间的38．4％，提高幅度超过28．3％，而属于低水平（小于100mg／kg）的频率在相同时期内则由89．9％下降到61．5％，全省土壤速效钾整体仍处于较缺乏水平；不同区域的耕地土壤速效钾增加速率明显不同，其中珠三角地区速效钾含量增加76mg／kg，增幅为155％，年平均增加2．6mg／kg，明显高于其他区域。施用钾肥是耕地土壤速效钾含量增加的主要原因，不同耕地利用类型、施肥处理、秸秆是否还田与土壤速效钾含量有密切关系。 |
|---|---|
| Bibliography: | 44-1267/S Based on the long-term monitoring data, the paper analyzed the changes of cultivated soil available potassium in Guangdong Province since 1984. The results showed that the overall level of Guangdong soil available potassium content increased by one time, with an average annual increase of 1.8 mg/kg since 1984. In all the monitoring points, the frequency of middle upper level （ higher than 100 mg/kg ） increased form 10.1% （ the period of ＂7th Five- Year Plan＂ ） to 38.4% （ the period of ＂12th Five-Year Plan＂ ）, the frequency of low level （ lower than 100 mg/kg ） decreased form 89.9% （ the period of ＂Tth Five-Year Plan＂ ） to 61.5% （ the period of ＂12th Five-Year Plan＂ ） , the available potassium was still in a relatively lack of level. The results also showed that the increase rates of soil available potassium content in different regions were obviously different, the content of soil available potassium in the Pearl River Delta region increased by 76 mg/kg, the annual average growth was 2.6 mg/kg, which |
| ISSN: | 1004-874X |