| 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 |
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| 引用本文： | 张亚娟,贺学礼,赵丽莉,张娟,许伟.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[J].环境科学研究,2017,30(11):1723-1731. |
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| 作者姓名： | 张亚娟 贺学礼 赵丽莉 张娟 许伟 |
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| 作者单位： | 河北大学生命科学学院, 河北 保定 071002 |
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| 基金项目： | 国家自然科学基金项目（31270460）；河北省自然科学基金项目（C2014201060） |
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| 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/Nw(SOC)/w(TN)]、C/Pw(SOC)/w(TP)]、N/Pw(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.
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| 关 键 词： | 土壤因子 球囊霉素 生态化学计量 沙鞭 沙蒿 |
| 收稿时间： | 2017/2/20 0:00:00 |
| 修稿时间： | 2017/7/4 0:00:00 |
Spatial Distribution of Glomalin and Ecological Stoichiometry Characteristics under Desert Plants in Saibei Sandland |
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| ZHANG Yajuan,HE Xueli,ZHAO Lili,ZHANG Juan and XU Wei.Spatial Distribution of Glomalin and Ecological Stoichiometry Characteristics under Desert Plants in Saibei Sandland[J].Research of Environmental Sciences,2017,30(11):1723-1731. |
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| Authors: | ZHANG Yajuan HE Xueli ZHAO Lili ZHANG Juan and XU Wei |
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| Affiliation: | College of Life Sciences, Hebei University, Baoding 071002, China |
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| Abstract: | The spatial distribution characteristics of glomalin and ecological stoichiometry of soils were explored along dunes under desert plants in Saibei sandland. The soil samples in the rhizosphere of Psammochloa villosa and Artemisia sphaerocephala were collected from three sites (top-dune, mid-dune, and foot-dune) along one typical dune in June 2013, and divided into five depth intervals:0-10, >10-20, >20-30, >30-40 and >40-50 cm. The results showed that soil nutrients and glomalin content were significantly different among the three studied sites and different soil layers. The contents of soil organic carbon, nitrogen, phosphorus and potassium at the bottom of the slope were significantly higher than those at the middle and top. The soil nutrient contents significantly decreased with the depth of soil layer. The glomalin content at the bottom of the slope was obviously lower than those at the middle and top of the slope. However, there was no significant difference in ecological stoichiometry ratios with slope position and soil layer. The mean contents of soil organic carbon (SOC), total nitrogen (TN) and total phosphorus (TP) were 5.936 mg/g, 1.286 mg/g and 0.115 mg/g, respectively, and C/N, C/P and N/P ratios in the soil were 4.918, 58.349 and 11.876, respectively. These values were significantly lower than the average levels for terrestrial soil in China. The means of the total glomalin-related soil proteins (GRSP) and easily extractable glomalin-related soil proteins (GRSP) were 1.822 and 0.838 mg/g, respectively, which were lower than those in grassland and forest ecosystems. The total GRSP was about 29.9% of the total organic carbon pool. The results showed that soil nutrients in the rhizosphere soil of Saibei desert plants were poor, and phosphorus deficiency was serious. Therefore, the distribution of glomalin could be used as an effective index to monitor and evaluate soil quality. |
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| Keywords: | glomalin edephic factors ecological stoichiometry Psammochloa villosa Artemisia sphaerocephala |
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