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水旱轮作条件下不同类型土壤供钾能力及钾素动态变化研究 预览 被引量:12

POTASSIUM SUPPLY CAPACITY OF AND POTASSIUM DYNAMICS IN DIFFERENT TYPES OF SOILS UNDER PADDY RICE-RYEGRASS ROTATION
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摘要 采用盆栽试验,研究了黑麦草-水稻轮作条件下不同类型土壤供钾能力及钾素动态变化,以期为土壤供钾机制研究及合理的钾素调控提供依据。结果表明:不施钾条件下(NP处理),潮土上种植作物的生物量和吸钾量最高,黄褐土次之,红壤最低;施钾条件下(NPK处理),3种土壤上种植作物的生物量无显著差异,作物吸钾量为黄褐土〉潮土〉红壤。整个轮作期,红壤、黄褐土和潮土NPK处理的作物生物量较NP处理分别增加55.6%、45.2%和23.2%,作物吸钾量分别增加368.8%、166.8%和74.5%。轮作前季(黑麦草季),NP处理的3种土壤水溶性钾含量和交换性钾含量均降低,潮土非交换性钾含量明显降低,红壤和黄褐土非交换性钾含量在前期变化不大,中期有升高的趋势,后期显著降低;NPK处理的土壤钾含量均高于NP处理,且各种形态钾含量的变化趋势与NP处理基本相同。轮作后季(水稻季),NP处理的3种土壤水溶性钾含量变化不大,交换性钾含量呈先降低后升高的趋势,非交换性钾含量呈先升高后降低的趋势;NPK处理的土壤交换性钾含量在水稻生长前期明显升高,中期下降,后期有略微上升,水溶性钾和非交换性钾含量有先升高后降低的变化趋势。综上所述,在不施钾条件下,轮作期内各土壤钾素消耗量较大,水溶性钾和交换性钾含量降低,并促进了非交换性钾的释放;施钾能提高土壤水溶性钾和交换性钾含量,并向非交换性钾方向转化,施钾对黑麦草和水稻有显著增产效果,可以有效地提高土壤供钾水平。 A pot experiment was carried out using different types of soils to study their potassium (K) supply capacities and K dynamics under a ryegrass-rice rotation system, with a view to providing scientific basis for the research on mechanism of soil supplying K and reasonable K control. Results show that both aboveground biomass and K uptake of the crops in the group without K treatment (NP) were the highest in fluvo-aquic soil (FS), which was followed by yellow cinnamon soil ( YCS), then red soil (RS) , while in the group with K, fertilization, no significant difference (p 〉 0.05 ) between the soils was observed in aboveground biomass and a decreasing order of YCS 〉 FS 〉 RS was in terms of K uptake. Treatment NPK was 55.6% , 45.2% and 23.2% higher than treatment NP for red soil, yellow cinnamon soil and fluvoaquic soil, respectively, in biomass and 368.8% , 166.8% and 74.5% , higher, respectively in K uptake. In the ryegrass growth season, the concentrations of water soluble K and exchangeable K in treatment NP decreased in all the soils. The concentration of non-exchangeable K decreased significantly in fluvo-aquie, but remained almost unchanged in the early season, rose in the middle season and dropped in the late season in yellow cinnamon soil and red soil. Soil K was much higher in treatment NPK than in treatment NP, but varied in a similar pattern in all the three soils, regardless of treatments and K forms. During the rice growing period, in treatment NP, water soluble K in all the soils did not change much soil exchangeable K declined first and then rose, but non-exchangeable K showed a reverse trend, while in treatment NPK, soil exchangeable K rose significantly in the early, and declined in the middle and then turned slightly back again in the late period, whereas soil water soluble K and non-exchangeable K showed a rising and then failing trend. To sum up, In treatment NP, K consumption was higher in all the soils and in all the periods of the rotation, thus decreasing both soi
作者 占丽平 李小坤 鲁剑巍 丛日环 王瑾 王筝 廖志文 Zhan Liping Li Xiaokun Lu Jianwei Cong Rihuan Wang Jin Wang Zheng Liao Zhiwen ( 1 College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China) (2 Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River) , Ministry of Agriculture, Wuhan 430070, China )
出处 《土壤学报》 CAS CSCD 北大核心 2013年第3期591-599,共9页 Acta Pedologica Sinica
基金 国家自然科学基金项目(41001178)、公益性行业(农业)科研专项经费项目(201203013)、华中农业大学新进博士科研启动专项(2009BQ080)和中央高校基本科研业务费专项资金联合资助
关键词 土壤供钾能力 红壤 黄褐土 潮土 黑麦草 水稻 Potassium supply capacity Red soil Yellow cinnamon soil Fluvo-aquic soil Ryegrass Rice
作者简介 占丽平(1988-),女,湖南石门人,硕士研究生,主要研究方向为土壤肥力。E-mail:zhan.li.ping@163.com 通讯作者,Tel:027—61379276:E—mail:lixiaokun@mail.hzau.edu.cn
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