阿拉善右旗荒漠盐碱土园林植物引进栽培技术研究
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摘要
通过对阿拉善右旗额肯呼都格镇硫酸盐型盐土掺拌细沙、增施腐熟羊粪土壤改良,引种灌木紫穗槐、多枝柽柳,落叶乔木刺槐、杏树、白榆,常绿乔木樟子松,草本马蔺、紫花苜蓿、高羊茅的适应性对比研究发现:
     ●引种地60 cm土层内均匀掺拌细沙(原土与细沙比例2∶1)处理土壤的含盐量、PH值等指标均显著低于、而有机质显著高于对照土壤(P<0.05),补施腐熟羊粪处理土壤(0.01m~3/m~2)与对照间无差异显著性(P>0.05);引种植物在掺拌细沙处理土壤的表现显著(P<0.05)优势于补施腐熟羊粪、对照两种土壤的表现,而补施腐熟羊粪与对照间无显著性差异(P>0.05)。这就充分说明土壤拌沙改良是一种行之有效而且效果显著的土壤改良方法。
     ●引进各树种适应能力山强到弱的顺序为:刺槐>柽柳>紫穗槐>白榆>杏树>樟子松,且刺槐、柽柳、紫穗槐、白榆、杏树均极显著的高于樟子松的适应能力(P<0.01),刺槐、柽柳、紫穗槐、白榆间无显著性差异(P>0.05),且刺槐、柽柳均显著(P<0.05)高于杏树的适应能力,紫穗槐、白榆、杏树间无显著性差异;引进各树种处理与对照权重值平均数的比较研究表明,各树种适应能力由强到弱的顺序与上相同,但各树种适应性权重值间的差异显著性与上不完全相同,即刺槐、柽柳的适应性权重值极显著的高于白榆、杏树和樟子松,紫穗槐的适应性权重值极显著的高于杏树和樟子松,而极显著的低于刺槐,显著低于柽柳,与白榆间无显著性差异,白榆极显著的高于樟子松,而显著的高于杏树,杏树又极显著的高于樟子松;另外,处理土壤中刺槐、柽柳、紫穗槐的适应性权重值均大于80%,而在对照土壤中只有刺槐的适应性权重值大于80%。综上所述,在研究区通过土壤拌沙改良,能够成功引种刺槐、柽柳、紫穗槐三种园林绿化树种,在无条件改良土壤时可成功引种刺槐。
     ●盐分胁迫能够降低参试种子的发芽势、发芽率及种子活力,参试种子田间适应性综合分析表明,适应性山强到弱的顺序为:马蔺>紫花苜蓿>高羊茅,且马蔺、紫花苜蓿的平均越冬率显著高于高羊茅的平均越冬率(P<0.05),马蔺与紫花苜蓿的平均越冬率间差异不显著(P>0.05),马蔺和紫花苜蓿的适应性权重值明显高于高羊茅,相差在20%以上,而马蔺和紫花苜蓿适应性权重值相差不大,说明这两种草坪地被植物在研究区的综合适应能力都较强;另外,高羊茅春季返青期有大量死苗现象,盖度随种植年限的增大而越來越低。因此,引种马蔺、紫花苜蓿是比较耐盐碱,抗寒的草坪地被植物,可作为当地城市绿化的优良材料大面积推广种植,而高羊茅在研究区的综合适应能力较差,不能作为在本研究区的推广草坪草种。
     ●重盐化土和盐土上的绿化引种,引种植物的成活率与其根系分布的深浅有直接的关系。大多深根系耐盐引种植物夏秋季能够忍受高含量盐分的胁迫而正常生长,冬季尤其极端低温时,部分有轻微冻害现象;引进国外地表网状葡匐浅层根系的高羊茅草坪虽能耐受极端低温,但却往往在翌年的早春瘁死,这主要是春季大量返盐,盐分大量聚集土壤表层,浅根系在高含量盐分的胁迫下,根系萌生活力大大减弱,加之经受春季较大变率的气温,植物根际反复出现冻融交替,很快失去活力而死亡。
Trials were conducted in Ekenhuduge town in Alashan Youqi of inner Mongolia, Fine sand and thoroughly decomposed sheep manure were applied on the sulphuric-salinity soil to improve the soil. Shrubs, such as Amorpha fruticosa Linn, Tamarixramosissima。deciduous arbor, such as Robinia pseudoacacia Linn, Armaniaca sibirica Linn, Ulmus pumla Linn. ever-green arbor, such as Pinus sylvestris L. var. mongolica, herbaceous plants, such as Irls ensata Thunb, Medicago sativa Linn, Tall Fescue, etc. were planted. Research on the comparison of their adaptability reveals:
     Within the 60-cm-deep soil layer, salt content and PH value of the soil which is mixed with fine sand (the ratio between original soil and fine sand is 2:1) are obviously lower than that of the non-treatment soil (P<0.05) . while the organic matter is higher, there is no obvious difference between the soil treated with thoroughly decomposed sheep manure (0.01 m~3/m~2) and the non-treatment (P>0.05 ) soil. The performance of introduced plants grown in the soil mixed with fine sands (P<0.05) are much better than that in the soil applied with thoroughly decomposed sheep manure and non-treatment soil; there's no obvious difference of plants' performance between the soil treated with thoroughly decomposed sheep manure and non-treatment soil (P>0.05) . So it can be concluded that applying fine sand in the soil is an effective measure to improve soil, and its result is significant.
     The adaptability of introduced species from strong to weak are: Robinia pseudoacacia Linn>Tamarixramosissma>Amorpha fruticosa Linn>Ulmus pumila L>Armeniaca sibirica L>Pinus sylvestris var. mongolica. Moreover, the adaptability of Robinia pseudoacacia Linn, Tamarixramosissima, Amorpha fruticosa Linn, lmus pumila L, Armeniaca sibirica L are all obviously stronger than that of Pinus sylvostris vat. mongolica (P<0.01) . there are no sharp differences among Robinia pseudoacacia Linn, Tamarix ramosissima, Amorpha fruticosa Linn, Ulmus pumila L (P>0.05), and the adaptability of Robinia pseudoacacia Linn and Tamarix amosissima (P<0.05) are obviously stronger than that of Armeniaca sibiricn L。there are no obvious differences among Amorpha fruticosa Linn, Ulmus pumila L and Armeniaca sibirica L. Research on the comparison between the treatments of introduced species and the average importance value shows: the adaptability of different species from strong to weak are the same as the above, but the importance value of adaptability of different species are quite different from the above. The importance value of adaptability of Robinia pseudoacacia Linn and Tamarixramosissima are obviously higher than that of Ulmus pumila L, Armeniaca sibirica L and Pinus sylvestris vat. mongolica; the importance value of adaptability of Amorpha fruticosa Linn is obviously higher than that of Armeniaca sibirica L and Pinus sylvestris vat. mongolica, while extremely lower than that of Robinia pseudoacacia Linn, lower than that of Tamarixramosissima, and is no obvious difference with that of Ulmus pumila L; the importance value of adaptability of Ulmus puila L is extremely higher than that of Pinus sylvestris var. mongolica, and obviously higher than that of Armeniaca sibirica L; the importance value of adaptability of Armeniaca sibirica L is extremely higher than that of Pinus sylvestris var. mongolica. Meanwhile, in the treated soil, the importance value of adaptability of Robinia pseudoacacia Linn, Tamarixramosissima and Amorpha fruticosa Linn are all higher than 80%, while in the non-treated soil, only the importance value of Robinia pseudoacacia Linn is higher than 80%. To be concluded,such 3 species for garden beautification as Robinia pseadoacacia Linn, Tamarixramosissima and Amorpha fruticosa Linn can be successfully introduced through applying fine sand for soil treatment; and if the condition for improving soil is not favorable, Robinia pseudoacacia Linn can be successfully introduced and planted.
     Salt stress will weak the germination potential, germination rate and vitality of the seeds in the trial. The comprehensive analysis of the adaptability of seeds in the trial shows: the adaptability of seeds, from strong to weak, are Iris ensata Thunb>Medicago sativa>Tall Fescue. The average survival ratio to spend winter of Iris ensata Thunb and Medicago sativa are obviously higher than that of Tell Fescue (P<0.05); there's no big difference of the average survival ratio to spend winter between Iris ensata Thunb and Medicago sativa (P>0.05 ). The importance value of adaptability of Iris ensata Thunb and Medicago sativa are obviously higher than that of Tall Fescue, with a difference of over 20%; the importance value of adaptability between Iris ensata Thunb and Medicago sativa are almost the same, which means this two speci4es are strong in adaptability in the plot. In addition, large quantity of Tall Fescue will die in spring, and the coverage becomes lower and lower as the species growing in many years. From the. trial, it can be concluded that Iris ensata Thunb and Medicago satire are the species which are strong in salt and cold-resistance, and can be extended in a large area as a fine species for city beautification; Tall Fescue has weak integrated adaptability in the plot, and is not feasible to be extended in a large area.
     In the soil with heavy and normal salinity, the survival ratio of introduced species is directly related to the depth of root system. For most of the species whose roots are strong in salt-resistance, they can endure the stress of heavy salt and grow normally in summer and autumn, while part of them will be damaged in winter due to extremely low temperature. The Tall Fescue with shallow root which is introduced from foreign countries can endure the extremely low temperature, however, it may die in the next early spring. The reason is that large amount of salt will accumulate on the soil surface in spring, the shallow root, under the stress of heavy salt, will have poor vitality. Moreover, due to the big temperature difference in spring, the root of plants will be repeatedly frozen and melted, which will cause their death because of losing adaptability.
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