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利用根袋模拟实验方法,研究了古尔班通古特沙漠南缘5种常见植物梭梭(Haloxylon ammodendron)、白梭梭(Haloxylon persicum)、刺沙蓬(Salsola ruathenica)、骆驼蓬(Peganum harmala)和骆驼刺(Alhagi sparsifolia)的根际和非根际土壤的pH值及养分含量状况。结果表明:干旱区五种植物均可以通过根系调节降低根际土壤pH,且梭梭根际和非根际的pH值差异显著。有机质含量除梭梭和白梭梭外均在根际显著聚集,其根际聚集率分别为刺沙蓬110.27%,骆驼蓬113.08%,骆驼刺为126.73%。全氮含量在刺沙蓬和骆驼蓬的根际中亏缺显著,亏缺率分别达24.54%和18.75%,而在骆驼刺根际中却显著聚集,聚集率为120.43%。有效氮在根际和非根际中的含量与全氮相反,刺沙蓬和骆驼蓬根际中聚集率分别为178.16%和151.76%,而在骆驼刺根际中亏缺率为45.79%。全磷含量和全钾含量在根际和给根际间均无显著差异。有效磷含量在刺沙蓬和骆驼蓬根际中出现了显著亏缺。速效钾含量在梭梭根际中表现为亏缺,在骆驼刺中表现为富集,而在其余3种植物中差异不显著。总之,5种干旱区植物均表现出不同程度的根际效应,对降低根际土的pH值、提高根际有机质含量有积极作用,对5种不同生活型植物的对比表明梭梭和白梭梭两种荒漠灌木在1 a的盆栽实验中,其根际效应没有草本植物根际效应大。
In this study, five common plants Haloxylon ammodendron, Haloxylon persicum, Salsola ruathenica, Peganum harmala ) And Alhagi sparsifolia rhizosphere and non-rhizosphere soil pH values and nutrient status. The results showed that the rhizosphere soil pH could be decreased by root system regulation in all five kinds of plants in arid area, and there was a significant difference in pH between rhizosphere and non-rhizosphere of Haloxylon ammodendron. The contents of organic matter except for both Haloxylon ammodendron and Haloxylon ammodendron all clustered in the rhizosphere. The rhizosphere accumulation rates were 110.27%, 113.08% and 126.73%, respectively. The total nitrogen content was significantly deficient in the rhizosphere of Punctuate and Peganum harmala, with a deficit rate of 24.54% and 18.75%, respectively, but significant accumulation in the rhizosphere of Camel thorn, with an accumulation rate of 120.43%. The content of available nitrogen in rhizosphere and non-rhizosphere was the opposite to that of total nitrogen. The concentrations of available nitrogen in rhizosphere and non-rhizosphere rhizosphere were 178.16% and 151.76% respectively, while that in camelid rhizosphere was 45.79%. There was no significant difference between total phosphorus and total potassium in rhizosphere and rhizosphere. Available phosphorus content showed a significant deficit in the rhizosphere of Sabina and Peganum harmala. Available potassium content showed deficit in Haloxylon ammodendron and was enriched in Alhagi sparsifolia, but not significant in the other three species. In conclusion, all the five kinds of arid zones showed different degrees of rhizosphere effects, which had a positive effect on reducing rhizosphere pH and increasing rhizosphere organic content. Comparison of five different living plants showed that Haloxylon ammodendron In the 1-year-old pot experiment, the rhizosphere effect of two desert shrubs was not as large as that of the rhizosphere of herbaceous plants.