沈阳市近郊大田土壤微量元素变化趋势调查

为了科学地指导施肥，笔者通过对沈阳市大田土壤15年间微量元素（锰、铁、铜、锌）的变化趋势的分析，探讨不同耕种方式对土壤微量元素含量变化的影响。于2000、2014年在沈阳市近郊采集了3974个稻田、玉米田、露地蔬菜耕层土样，室内化验分析结果表明：调查区土壤有效性锰、铁、铜、锌的含量丰缺值变幅较大，并且这种变化与种植类型有直接关系。其中有1/3的土壤缺锌，主要集中在稻田和玉米田，土壤缺硼已成为普遍现象。其他元素的变化在3种种植类型的土壤中变化不明显。

Variation Trend of Field Trace Elements in Suburbs of Shenyang

In order to guide fertilization scientifically, the authors investigated the effects of different cultivation patterns on the variation trend of field trace elements (Mn, Fe, Cu and Zn) during 15 years. 3974 soil samples were collected from paddy field, maize field and open vegetable topsoil in 2000 and 2014 respectively in suburbs of Shenyang, the results of indoor test showed that the variation range of available Mn, Fe, Cu and Zn was large, which was related to cultivation pattern directly. About 1/3 fields lacked Zn and most of them were rice and maize field. And the deficiency of B was common. The variation of other elements was not significant in this three cultivation patterns.