研究了兰州市永登县秦王川灌区中型狼尾草（Pennisetum longissimum var. intermedium）、新疆大叶苜蓿（Medicago sativa）和皮燕麦（Avena sativa）对盐渍土的适应特点及其改盐效应。通过对3种植物不同生育期（播后90 d、120 d、150 d）根际土壤pH值、导电率（EC）、盐分离子及有机质含量的测定，探讨盐渍化土壤影响下耐盐植物根际微环境的变化。结果显示：在盐渍化逆境下，3种植物对于根际土壤微环境均有一定调节作用，生育期内土壤pH值、EC值、Na+、SO42-、Cl-和Ca2+含量逐渐降低，土壤有机质含量逐渐增加。新疆大叶苜蓿根际土壤pH值变化较为突出，其次是中型狼尾草和皮燕麦，播后150 d较播前降幅分别为2.18%、2.06%、1.21%；中型狼尾草根际土壤EC值降幅最大，其次为新疆大叶苜蓿和皮燕麦，播后150 d较播前降幅分别为42.69%、33.29%、28.33%；在3个取样期，中型狼尾草根际土壤Na+、SO42-、Cl-含量变化幅度最大，新疆大叶苜蓿对Ca2+的吸收能力强于中型狼尾草和皮燕麦；中型狼尾草在生长期内根际土壤有机质含量持续增加，新疆大叶苜蓿在生长前期有机质增量较显著，生长中后期增量减缓，根际微环境变化趋于稳定。综合而言，中型狼尾草对盐渍土的适应及改良效应较突出，其次是新疆大叶苜蓿，再次是皮燕麦。
Adaptation of Pennisetum longissimum var. intermedium, Medicago sativa and Avena sativa growing in saline soils in Qinwangchuan of Gansu, China was investigated by measuring the changes of rhizospheric pH value, electronic conductivity (EC), content of salt ions and organic matter at 90 d, 120 d and 150 d after sowing. The results showed that the three plants had adjustment effects on saline soil microenvironment, which were proved by decreases of the pH, EC, content of Na+, SO42-, Cl- and Ca2+ and increases of the content of organic matter progressively during the whole growth period. Medicago Sativa had the greatest effect on pH, the next was Pennisetum longissimum var. intermedium, followed by Avena sativa, decreased by 2.18%, 2.06% and 1.21% at 150 d after sowing, respectively. Pennisetum longissimum var. intermedium was found with the greatest effect on EC, the next was Medicago sativa, followed by Avena sativa, decreased by 42.69%, 33.29% and 28.33% at 150 d afer sowing, respectively. During the growth period, the changes in the content of Na+, SO42- and Cl- were the greatest for Pennisetum longissimum var. intermedium, while Medicago sativa had better absorption for Ca2+. The content of organic matter increased continuously within the whole growth period for Pennisetum longissimum var. intermedium. A significant increase of the content of organic matter for Medicago sativa was found during earlier growth stage, which slowed down during medium and later growth stages. In conclusion, Pennisetum longissimum var. intermedium had the best adaptation and improvement capacity in saline soil, followed by Medicago sativa and Avena sativa.
[1] 陈能场,童庆宣.根际环境在环境科学中的地位[J].生态学杂志,1994,13(3):45-52.
[2] 吕东英,李卫红,杨玉海,等.多枝怪柳幼苗根际微生物数量与分布对土壤水分变化的响应[J].中国沙漠,2012,32(3):737-743.
[3] 陈波,林建国,陈清,等.根际环境及其对土壤污染物的作用[J].安徽农业科学,2009,37(16):7617-7619,7629.
[4] 曾曙才,苏志尧,陈北光,等.植物根际营养研究进展[J].南京林业大学学报(自然科学版),2003,27(6):79-83.
[5] 李从娟,马键,李彦,等.梭梭和白梭梭主根周围土壤养分的梯度分布[J].中国沙漠,2011,31(5):1174-1180.
[6] Leinweber P,Mcissncr R,Eckhardt K U,et al. Management facts on forms of phosphorus in soil and leaching losses[J]. European journal of Soil Science,1999,50:413-424.
[7] Tan K H. Nopamornbodi O. Electron microbeam analysis and scanning electron microscopy of soil-root interface[J]. Soil Science,1981,131(3):100-106.
[8] 高翔,王爱民,张世彪.兰州秦王川灌区水资源配置分析[J].中国沙漠,2001,21(1):67-71.
[9] 董进明,毛志芳.适宜西北地区次生盐渍化土壤栽培的牧草品种筛选[J].草原与饲料,2011,31(2):43-46.
[10] 丁光伟,赵存兴.黄土高原地区土地盐渍化的防治[J].干旱区资源与环境,1991,5(4):50-60.
[11] 樊自立,马英杰,马映军.中国西部地区的盐渍土及其改良利用[J].干旱区研究,2001,18(3):1-6.
[12] 王文,张德罡.白茎盐生草对盐碱土壤的改良效果[J].草业科学,2011,28(6):902-904.
[13] 董利苹,曹靖,李先婷,等.不同耐盐植物根际土壤盐分的动态变化[J].生态学报,2011,31(10):2813-2821.
[14] 鲍士旦.土壤农化分析[M].北京:中国农业出版社,2000,12-21.
[15] 龚家栋.作物的耐盐性及盐水灌溉管理[J].中国沙漠,1995,15(2):158-163.
[16] Wang X P,Geng S J,Ri Y J. Physiological responses and adaptive strategies of tomato plantstosalt and alkaline stresses[J]. Scientia Horticulturae,2011,130:248-255.
[17] 许祥明,叶和春,李国凤.植物抗盐机理的研究进展[J].应用与环境生物学报,2000,6(4):379-387.
[18] 谢振宇,杨光穗.牧草耐盐性研究[J].草业科学,2003,20(8):11-16.
[19] 张立全,张凤英,哈斯阿古拉.紫花苜蓿耐盐性研究进展[J].草业学报,2012,21(6):296-305.
[20] 杨青川,孙彦,苏加楷,等.紫花苜蓿耐盐育种及耐盐研究基础的进展[J].中国草地,2001,23(1):59-62.
[21] 张有福,陈拓,费贯清,等.盐度对三种荒漠植物渗透调节物质积累影响的研究[J].中国沙漠,2007,27(5):787-790.
[22] 弋良朋,马健,李彦.不同土壤条件下荒漠盐生植物根际盐分特征研究[J].土壤学报,2007,44(6):1139-1143.
[23] 张怀山.9个国产狼尾草野生种的特征特性与栽培利用研究[J].草业与畜牧,2009,169(12):18-21.
[24] 陆炳章,许慰睽.杂交狼尾草在盐渍土区生长特性及其应用[J].中国草地,1990,2:58- 62.
[25] 刘国道,白昌军,王东劲,等.热研4号王草选育[J].草地学报,2002,10(2):92-96.
[26] 李光道,白生才,张秀志,等.植物抗盐性研究综述[J].甘肃农业科技,2011,2:29-32.
[27] Rygol J,Zimmermann U. Radial and axial turgor pressure measurements in individual root cells of Msembryanthemum crystallinum grown under various saline conditions[J]. Plant Cell Environment,1990,13:15-26.
[28] 弋良朋,马健,李彦.两种土壤条件下荒漠盐生植物根际系统养分分布的实验研究[J].中国沙漠,2008,28(3):443-448.
[29] 牛灵安,郝晋珉,张宝忠,等.盐渍化改造区土壤有机质变化与培肥系统研究[J].中国农业大学学报,2003,8(l):26-30.
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