【作者】 段建南； 王改兰； 贾宁凤； 黄学芳； 池宝亮； 张亮；

【Author】 SDuan Jiannan~1 Wang Gailan~1 Jia Ningfeng~2 Huang Xuefang~3 Chi Baoliang~3 Zhang liang~1 (1.College of Resources and Environment,Hunan Agricultural University.,Changsha 410128,China; 2.College of Economics and Management,Shanxi University,Taiyuan 030006,China 3.Arid Farming Research Center,Shanxi Academy of Agricultural Sciences,Tayuan 030031,China)

【机构】 湖南农业大学资源环境学院； 山西大学经济与工商管理学院； 山西农科院旱地农业研究中心；

【摘要】 在晋西北黄土丘陵区栗褐土上进行的长期定位施肥试验结果表明,18年后不同施肥处理土壤全钾含量无显著差异,而土壤速效钾含量和缓效钾含量则产生了极显著差异。就表层土壤而言,无外源钾补充的三个处理（NP、 N、CK）,土壤速效钾含量较低,在78～90 mg·kg^-1之间,已接近中等水平的下限,施低量有机肥的三个处理（M1、 M1N、M1NP）,土壤速效钾含量为150～185 mg·kg^-1,在极高水平指标的左右,施高量有机肥的2个处理（m²NP、 m²N）,土壤速效钾含量达240 mg·kg^-1以上,是土壤速效钾含量极高水平指标的1.45倍多。不同处理对土壤缓效钾含量的影响与土壤速效钾含量基本一致,以施高量有机肥的处理>施低量有机肥的处理>不施有机肥的处理,但处理间的变化幅度明显低于土壤速效钾含量的变化幅度。不同处理对20～40 cm 土壤速效钾和缓效钾含量也产生了一定影响,变化规律与耕层相似,但没有耕层明显。耕层土壤有机质含量与土壤速效钾和缓效钾含量具有高度的指数相关。更多还原

【Abstract】 Soil potassium nutrient is analyzed sampling in the long-term experiment plot on chestnut cinna- mon soil,located at Zhuanyaogou experiment area,northwestern Shanxi province,in the Loess Plateau re- gion.The results show that there are no significance of difference in content of total potassium in soil,hut there are top significance of difference in content of readily available potassium and slowly available potas- sium in soil,after 18 years different fertilizer treatments.In surface soil layer（0～20 cm）,contents of readi- ly available potassium in three treatments（NP,N and CK）,no applications of farmyard manure（no supply of potassium sources）,are between78～90 mg·kg^-1,near the lower limit of medium lever of readily availa- ble potassium.The contents in three treatments（M1,MIN and M1NP）,fewer applications of farmyard ma- nure,are between 150～185 mg·kg^-1,around the very high lever.The contents in two treatments（m²NP and m²N）,more applications of farmyard manure,are more than 240 mg·kg^-1,about time and a half of the very high lever.The effect of treatments on the content of slowly available potassium is consistent basically with that on the content of readily available potassium in surface soil layers,that is treatments of more ap- plications of farmyard manure>treatments of fewer applications of farmyard manure>treatments of no applications of farmyard manure.But the change extent of the content of slowly available potassium is less than that of readily available potassium in treatments.In subsurface layer（20～40 cm）,there are a few effects of treatments on the content of readily available potassium and slowly available potassium.The change of the content is the same situation but no significance of difference as the surface soil layer.There are high exponential correlations between the content of soil organic mater and the content of readily avail- able potassium and the content of slowly available potassium in surface soil layer.更多还原