[1] Fan F, Zhang Q G, Zhang Y L, et al . Fertilization effects on alfalfa nodule. Bulletin of Agricultural Science and Technology, 2006, (7): 96-98. [2] Yan J, Han X Z, Wang S Y, et al . Effect of different forms nitrogen on nodule growth and nitrogen fixation in Soybean. Soybean Science, 2009, 28(4): 674-677. [3] Liu X J, Liu Y N. Effects of different N levels on productivity and quality of alfalfa varieties. Acta Agrestia Sinica, 2013, 7(4): 702-707. [4] Liu X J, Kuai J L, Li W Q, et al . Effects of NH 4 + -N and NO 3 - -N on root growth, nodulation and nitrogen-fixation of alfalfa. Journal of Gansu Agricultural University, 2011, 46(5): 106-110. [5] Heidi T, Heuberger J, Kling G, et al . Contribution of N uptake and morphological root characteristics to N efficiency in tropical maize cultivars. Crop Production, 2002, 29: 958-963. [6] Xu G W, Li S, Zhao Y F, et al . Effects of straw returning and nitrogen fertilizer application on root secretion and nitrogen utilization of rice. Acta Prataculturae Sinica, 2014, 23(2): 140-146. [7] Peng L Q, Li X Y, Qi X, et al . The relationship of root traits with persistence and biomass in 10 alfalfa varieties. Acta Prataculturae Sinica, 2014, 23(2): 147-153. [8] Kuai J L, Liu X J, Li W Q. Effects of different nitrogen levels on the growth characteristics of alfalfa inoculated with rhizobium. Grassland and Turf, 2010, 31(3): 56-59. [9] Linkohr B I, Williamson L C, Fitter A H, et al . Nitrate and phosphate availability and distribution have different effects on root system architecture of Arabidopsis . The Plant Journal, 2002, 29(6): 751-760. [10] Chen P, Feng K, Wang X L, et al . Effects of pH on uptake of different forms of nitrogen by young core. Journal of Yangzhou University (Agricultural and Life Sciences Edition), 2003, 24(3): 46-50. [11] Yang X E, Sun X. Different varieties of NH 4 + -N and NO 3 - -N absorption kinetics. Chinese Journal of Soil Science, 1991, 22(5): 222-224. [12] Qiao Y F, Miao S J, Han X Z. Effects of nitrogen forms on the root morphology and proton extrusion in soybean. Soybean Science, 2006, (3): 265-269. [13] Sun M, Guo W S, Sun T F, et al . Effects of nitrogen forms on root characteristics in wheat. Journal of Yangzhou University (Agricultural and Life Sciences Edition), 2007, 28(1): 54-57. [14] Song H X, Shen S L, Ma S Y, et al . Effects of NH 4 + -N and NO 3 - -N on the nitrogen fixation of soybean nodules. Soybean Science, 1997, 16(4): 283-286. [15] Gan Y B, Tu X W, Tian R J. Study on optimum timing of nitrogen application on soybean. Soybean Science, 1998, 17(4): 287-291. [16] He J G, Yan H, Jia J C, et al . Effect of nitrogen management on growth and yield of soybean. Soybean Bulletin, 1990, (10): 11-15. [17] Zhang Q, Zhang L, Wei S Q, et al . Effects of Ca 2+ on acid tolerance of Medicago sativa and Rhizobium meliloti . Chinese Journal of Applied Ecology, 2007, 18(6): 1231-1236. [18] Sun J G, Zhang Y C, Xu J, et al . Isolation and biological characteristic investigation on efficient nitrogen-fixing bacilli. Scientia Agricultura Sinica, 2009, 42(6): 2043-2051. [19] Wang F, Liu B, Zhu J W. Effect of magnesium (Mg) on root activity, chlorophyll content and permeability of soybean. Journal of Agro-Environment Science, 2004, 23(2): 235-259. [20] Yao T, Zhang D G, Hu Z Z. Associative nitrogen-fixing bacteria in the rhizosphere of Avena sativa in an alpine region I Isolation an identification. Acta Prataculturae Sinica, 2004, 13(2): 106-111. [21] Nan L L, Shi S L, Zhang J H. Study on root system development ability of different root-type alfalfa. Acta Prataculturae Sinica, 2014, 23(2): 117-124. [22] Zhang C M, Xu Y H, Zhao H J. Effects of different nitrogen forms on nitrogen uptake and root growth of rice at the seedling stage. Journal of Nanjing Agricultural University, 2011, 34(3): 72-76. [23] Saravitz C H, Chaillou S, Mussel J, et al . Influence of nitrate on uptake of ammonium by niteogen-depleted soybean: is the dffect located in roots or shoot. Journal of Experimental Botany, 1994, 280(45): 1575-1584. [24] Liu Y N, Liu X J, Zhang X L, et al . Effect of clipping and fertilization on production performance of different alfalfa varieties. Grassland and Turf, 2013, 33(3): 69-73. [25] Wang S Q, Han X Z, Qiao Y F. Root morphology and nitrogen accumulation in soybean ( Glycine max L.) under different nitrogen application levels. Chinese Journal of Eco-Agriculture, 2009, 17(6): 1069-1073. [26] Wang D Y, Wang Z Q. Effect of planting date, plant density and nitrogen application rate on yield and quality of vegetable soybean. Journal of Zhejiang University (Agricultural and Life Sciences Edition), 2001, 27(1): 69-72. [27] Dong S K, Liu L J, Sun C Z, et al . Effects of nitrogen levels on nodule growth of soybean using 15 N tracing method. Plant Nutrition and Fertilizer Science, 2011, 17(4): 985-988. [28] Li B Z, Xin W J, Sun S B, et al . Physiological and molecular responses of nitrogen starved rice plants to re-supply of different nitrogen sources. Plant and Soil, 2006, 287(1-2): 145-159. [29] Jia Y B, Yang X E, Liu J X. Morphological and physiological adaptation of plant root to nutrient defficit and elemental toxicity stress. Chinese Journal of Soil Science, 2005, 36(4): 610-616. [1] 范富, 张庆国, 张永亮, 等. 施肥对紫花苜蓿根瘤的影响. 农业科技通报, 2006, (7): 96-98. [2] 严君, 韩晓增, 王守宇, 等. 不同形态氮对大豆根瘤生长及固氮的影响. 大豆科学, 2009, 28(4): 674-677. [3] 刘晓静, 刘艳楠. 供氮水平对不同紫花苜蓿产量及品质的影响. 草地学报, 2013, 7(4): 702-707. [4] 刘晓静, 蒯佳林, 李文卿, 等. 硝态氮与铵态氮对紫花苜蓿根系生长及结瘤固氮的影响. 甘肃农业大学学报, 2011, 46(5): 106-110. [6] 徐国伟, 李帅, 赵永芳, 等. 秸秆还田与施氮对水稻根系分泌物及氮素利用的影响研究. 草业学报, 2014, 23(2): 140-146. [7] 彭岚清, 李欣勇, 齐晓, 等. 紫花苜蓿品种根部特性与持久性和生物量的关系. 草业学报, 2014, 23(2): 147-153 [8] 蒯佳林, 刘晓静, 李文卿. 不同氮素水平对接种根瘤菌紫花苜蓿生长特性的影响. 草原与草坪, 2010, 31(3): 56-59. [10] 陈平, 封克, 汪晓丽, 等. 营养液pH对玉米幼苗吸收不同形态氮素的影响. 扬州大学学报(农业与生命科学版), 2003, 24(3): 46-50. [11] 杨肖娥, 孙羲. 不同水稻品种NH 4 + -N和NO 3 - -N吸收的动力学. 土壤通报, 1991, 22(5): 222-224. [12] 乔云发, 苗淑杰, 韩晓增. 氮素形态对大豆根系形态性状及释放H + 的影响. 大豆科学, 2006, (3): 265-269. [13] 孙敏, 郭文善, 孙陶芳, 等. 氮素形态对小麦根系特性影响的初步研究. 扬州大学学报: 农业与生命科学版, 2007, 28(1): 54-57. [14] 宋海星, 申斯乐, 马淑英, 等. 硝态氮和氨态氮对大豆根瘤固氮的影响. 大豆科学, 1997, 16(4): 283-286. [15] 甘银波, 涂学文, 田任久. 大豆的最佳氮肥施用时期研究. 大豆科学, 1998, 17(4): 287-291. [16] 何建国, 严华, 贾金川, 等. 不同氮肥管理对大豆生长及产量的影响. 大豆通报, 1990, (10): 11-15. [17] 张琴, 张磊, 魏世清, 等. 钙离子对紫花苜蓿及苜蓿根瘤菌耐酸能力的影响. 应用生态学报, 2007, 18(6): 1231-1236. [18] 孙建光, 张燕春, 徐晶, 等. 高效固氮芽孢杆菌筛选及其生物学特性. 中国农业科学, 2009, 42(6): 2043-2051. [19] 王芳, 刘鹏, 朱靖文. 镁对大豆根系活力叶绿素含量和膜透性的影响. 农业环境科学学报, 2004, 23(2): 235-259. [20] 姚拓, 张德罡, 胡自治. 高寒地区燕麦根际联合固氮菌研究Ⅰ: 固氮菌分离及鉴定. 草业学报, 2004, 13(2): 106-111. [21] 南丽丽, 师尚礼, 张建华. 不同根型苜蓿根系发育能力研究. 草业学报, 2014, 23(2): 117-124. [22] 张辰明, 徐烨红, 赵海娟. 不同氮形态对水稻苗期氮素吸收和根系生长的影响. 南京农业大学学报, 2011, 34(3): 72-76. [24] 刘艳楠, 刘晓静, 张晓磊, 等. 施肥与刈割对不同紫花苜蓿品种生产性能的影响. 草原与草坪, 2013, 33(3): 69-73. [25] 王树起, 韩晓增, 乔云发. 施氮对大豆根系形态和氮素吸收积累的影响. 中国生态农业学报, 2009, 17(6): 1069-1073. [26] 王丹英, 汪自强. 播期、密度、氮肥用量对菜用大豆产量和品质的效应. 浙江大学学报(农业与生命科学版), 2001, 27(1): 69-72. [27] 董守坤, 刘丽君, 孙聪姝, 等. 利用 15 N标记研究氮素水平对大豆根瘤生长的影响. 植物营养与肥料学报, 2011, 17(4): 985-988. [29] 贾彦博, 杨肖娥, 刘建祥. 植物根系对养分缺乏和毒害的适应及其与养分吸收效率的关系. 土壤通报, 2005, 36(4): 610-616. |