北京地区施硫肥对苜蓿形态和产量的影响  

Effect of sulfur fertilizer on the morphology and production of Medicago sativa in the Beijing region

作　　者：周湧[1] 汪诗平[2] 陈默君[3] 

机构地区：[1]中国农业科学院农业环境与可持续发展研究所,北京100081 [2]中国科学院西北高原生物研究所,青海西宁810008 [3]中国农业大学草地研究所,北京100094

出　　处：《草业学报》2005年第5期75-80,共6页Acta Prataculturae Sinica

基　　金：国家十五攻关项目(2002BA518A03-02);中国科学院院长基金资助

摘　　要：在北京地区进行了不同施硫肥水平对苜蓿生产和土壤有效硫(NaHCO3浸提)含量变化的影响的试验.结果表明,施硫肥显著增加了苜蓿的生长和发育,延长了第4茬的生长期;养分缺乏导致更多光合产物分配到茎部,使茎叶比增加.施硫肥增大了苜蓿最新展开的三出复叶的叶面积,叶绿素含量升高,最终提高苜蓿干物质产量30%左右.在相同或相近的密度下,苜蓿初花期的高度可以很好地预测其干物质产量.生长季结束时不施硫肥的土壤有效硫含量显著比生长季前的低,土壤中各层次有效硫含量与苜蓿干物质总产量间均存在显著性正相关.总体上,0～45 cm土壤中以NaHCO3浸提的有效硫含量在20～30 mg/kg较适宜.This experiment was conducted in order to study the effect of sulfur fertilizer application on both Medicago sativa production and on soil available S as extracted by NaHCO3 ,in the Beijing region. The results showed that S application significantly increased M. sativa production and development as well as growth rate, regeneration rate,stem height and basal stem diameter. Further,S application significantly enhanced trifoliate leaf area and chlorophyll concentration and decreased the ratio of stem to leaf dry matter （DM）. Soil available S extracted by NaHCO3 at the end of the experiment was significantly lower without S application compared with what was extracted at the beginning of the growth season. The correlations between total DM yield per year and soil available S at different soil depths were significant. Overall 20-30 mg/kg available S in soils was required for the maximum DM yield to be achieved,although the spatial and temporal variations of soil available S were shown to be large within the growing season.

关 键 词：北京地区 硫肥 苜蓿形态 干物质产量 

分 类 号：S541.9[农业科学—作物学]