塞北荒漠植物根围球囊霉素和生态化学计量特征的空间分布

发布时间：2018-12-30 16:40

【摘要】：为探明塞北荒漠梁地植物根围土壤球囊霉素和生态化学计量特征的空间分布规律,于2013年6月选取内蒙古正蓝旗青格勒图典型梁地阳坡,设置梁底、梁坡和梁顶3个样地,按照0~10、10~20、20~30、30~40、40~50 cm五个土层分别采集沙鞭(Psammochloa villosa)和沙蒿(Artemisia sphaerocephala)根围土壤样品,分析土壤因子、球囊霉素含量和生态化学计量特征.结果表明,梁底土壤w(SOC)(SOC为有机碳)、w(TN)、w(碱解氮)、w(TP)、w(有效钾)和w(球囊霉素)明显高于梁坡和梁顶,不同样地内,随着土层加深,土壤养分含量逐渐降低,w(球囊霉素)显著降低,但生态化学计量比随坡位及土层变化不显著.不同样地土壤w(SOC)、w(TN)、w(TP)平均值分别为5.936、1.286、0.115 mg/g,C/N[w(SOC)/w(TN)]、C/P[w(SOC)/w(TP)]、N/P[w(TN)/w(TP)]平均值分别为4.918、58.349、11.876,均低于全国陆地土壤平均水平.土壤中w(总球囊霉素)和w(易提取球囊霉素)平均值分别为1.822和0.838 mg/g,低于森林生态系统和草地生态系统,w(总球囊霉素)约占有机碳库的29.9%,具有较高的贡献值.研究显示,塞北荒漠植物根围土壤养分贫乏,磷素缺乏严重;球囊霉素含量及其生态分布规律可作为监测和评价土壤质量状况的有效指标.
[Abstract]:In order to find out the spatial distribution of balloon mycin and ecostoichiometric characteristics of plant root environs in the desert beam land of the north of Saibei, in June 2013, three sample plots, namely, the beam bottom, the beam slope and the beam top, were set up on the typical Liangdiyang slope of Qingglertu, Zhenglan Banner, Inner Mongolia. The soil samples of (Psammochloa villosa) and (Artemisia sphaerocephala) were collected from five soil layers of 0 ~ (10) 10 ~ 10 ~ (10) ~ 10 ~ (20) ~ (20) ~ (20) C ~ (20) C ~ (30) C ~ (40) ~ (50) cm to analyze the soil factors, the content of balloon mycin and the characteristics of ecostoichiometry. The results showed that w (SOC) (SOC of soil under beam was organic carbon,), w (TN), w (, alkali-hydrolyzed nitrogen,), w (TP), w (, available potassium) and w (balloon mycin) were significantly higher than those of beam slope and beam top, and in different fields, with the deepening of soil layer, Soil nutrient content decreased gradually and, w (balloon mycin) decreased significantly, but the eco-stoichiometric ratio did not change significantly with slope position and soil layer. The mean values of soil w (SOC), w (TN), w (TP) were 5.936 ~ 1.286 ~ 0.115 mg/g,C/N [w (SOC) / w (TN)], C / P [w (SOC) / w (TP)], respectively. The average value of N / P [w (TN) / w (TP)] was 4.918 ~ 58.349 ~ 11.876, which was lower than the national average level of terrestrial soil. The average values of w (total balloon mycin) and w (easy to extract balloon mycin) in soil were 1.822 and 0.838 mg/g, respectively, which were lower than those in forest ecosystem and grassland ecosystem (, w (total balloon mycin) accounting for 29.9% of organic carbon pool. Has a high contribution value. The results showed that the nutrient deficiency and phosphorus deficiency of the desert plant rhizosphere soil were poor, and the content of balloon mycin and its ecological distribution could be used as an effective index to monitor and evaluate the soil quality.
【作者单位】：河北大学生命科学学院;
【基金】：国家自然科学基金项目(31270460) 河北省自然科学基金项目(C2014201060)
【分类号】：Q948;X172

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