为探明荒漠植物沙柳（Salix psammophila）根围AM真菌时空异质性,2009年5月、8月和10月分别从内蒙古荒漠植物沙柳根围分0~10,11~20,21~30,31~40和41~50 cm 5个土层采集土壤样品,研究了AM真菌时空分布及与土壤因子的相关性.结果表明,沙...为探明荒漠植物沙柳（Salix psammophila）根围AM真菌时空异质性,2009年5月、8月和10月分别从内蒙古荒漠植物沙柳根围分0~10,11~20,21~30,31~40和41~50 cm 5个土层采集土壤样品,研究了AM真菌时空分布及与土壤因子的相关性.结果表明,沙柳根围AM真菌平均孢子密度为282个/100g,平均总定殖率0.642;从土壤中共分离AM真菌3属20种,其中球囊霉属（Glomus）15种、无梗囊霉属（Acaulospora）4种、盾巨孢囊霉属（Scutellospora）1种.AM真菌孢子密度、菌丝定殖率和丛枝定殖率随时间变化先升后降,最大值出现在8月;泡囊定殖率随时间变化先降后升,最大值出现在10月;随土壤深度增加,孢子密度和定殖率下降,最大孢子密度和最高定殖率均出现在10月份0~10 cm土层.孢子密度与土壤温度、pH极显著正相关,与土壤速效P极显著负相关;泡囊定殖率与土壤碱解N显著正相关;丛枝定殖率与土壤温度、湿度和pH极显著正相关,与土壤碱解N极显著负相关;菌丝定殖率与易提取球囊霉素极显著正相关.总球囊霉素和易提取球囊霉素与土壤碱解N和有机C极显著正相关.球囊霉素含量的动态变化能够综合反映土壤AM真菌分布和活动、有机C动态和养分循环进程,应作为荒漠土壤质量和功能评价的新指标进一步深入研究.展开更多
The liquefied product of Salixpsammophila wood was separated by thin-layer chromatography （TLC） and column chromatography, and its structure was identified by nuclear magnetic resonance （NMR） spectra in our study....The liquefied product of Salixpsammophila wood was separated by thin-layer chromatography （TLC） and column chromatography, and its structure was identified by nuclear magnetic resonance （NMR） spectra in our study. The separation result indicates that the sample of liquefied S. psammophila contained at least two categories of components. The structure of the main components was guaiacyl C-1, C-2 of the hydroxyphenyl propane, i.e., the aromatic nucleus protons of lignin. Degradation and polycondensation reactions occurred when the S. psammophila wood was liquefied in phenol. Polycondensation reactions occurred among the depolymerization products from cellulose, the aromatic depolymerization products from lignin and the products of the displacement reactions between phenoxide ion and cellulose.展开更多
In order to extend the investigation of the characteristics of desert shrub liquefaction and the structure of liquefied desert shrubs, we studied the liquefaction of Salixpsammophila and Caragana intermedia in the pre...In order to extend the investigation of the characteristics of desert shrub liquefaction and the structure of liquefied desert shrubs, we studied the liquefaction of Salixpsammophila and Caragana intermedia in the presence of phenol and used FTIR analysis on unliquefied and liquefied S. psammophila and C. intermedia. The results showed that the liquefaction effects are enhanced with an increase in temperature, catalyst content and liquid ratio. FTIR analysis proved that more active functional groups appeared after S. psammophila and C. intermedia were liquefied in the presence of phenol. These results can provide a theoretical basis for the further utilization of liquefied S. psammophila and C. intermedia and the development of desert shrubs in a new utilization field.展开更多
文摘为探明荒漠植物沙柳（Salix psammophila）根围AM真菌时空异质性,2009年5月、8月和10月分别从内蒙古荒漠植物沙柳根围分0~10,11~20,21~30,31~40和41~50 cm 5个土层采集土壤样品,研究了AM真菌时空分布及与土壤因子的相关性.结果表明,沙柳根围AM真菌平均孢子密度为282个/100g,平均总定殖率0.642;从土壤中共分离AM真菌3属20种,其中球囊霉属（Glomus）15种、无梗囊霉属（Acaulospora）4种、盾巨孢囊霉属（Scutellospora）1种.AM真菌孢子密度、菌丝定殖率和丛枝定殖率随时间变化先升后降,最大值出现在8月;泡囊定殖率随时间变化先降后升,最大值出现在10月;随土壤深度增加,孢子密度和定殖率下降,最大孢子密度和最高定殖率均出现在10月份0~10 cm土层.孢子密度与土壤温度、pH极显著正相关,与土壤速效P极显著负相关;泡囊定殖率与土壤碱解N显著正相关;丛枝定殖率与土壤温度、湿度和pH极显著正相关,与土壤碱解N极显著负相关;菌丝定殖率与易提取球囊霉素极显著正相关.总球囊霉素和易提取球囊霉素与土壤碱解N和有机C极显著正相关.球囊霉素含量的动态变化能够综合反映土壤AM真菌分布和活动、有机C动态和养分循环进程,应作为荒漠土壤质量和功能评价的新指标进一步深入研究.
基金supported by grants 200508010603 and 200711020504 from the key pro-ject of the Natural Science Foundation of the InnerMongolia Autonomous Region
文摘The liquefied product of Salixpsammophila wood was separated by thin-layer chromatography （TLC） and column chromatography, and its structure was identified by nuclear magnetic resonance （NMR） spectra in our study. The separation result indicates that the sample of liquefied S. psammophila contained at least two categories of components. The structure of the main components was guaiacyl C-1, C-2 of the hydroxyphenyl propane, i.e., the aromatic nucleus protons of lignin. Degradation and polycondensation reactions occurred when the S. psammophila wood was liquefied in phenol. Polycondensation reactions occurred among the depolymerization products from cellulose, the aromatic depolymerization products from lignin and the products of the displacement reactions between phenoxide ion and cellulose.
基金This study was financially supported by the Natural Science Foundation of Inner Mongolia(No.200508010603).
文摘In order to extend the investigation of the characteristics of desert shrub liquefaction and the structure of liquefied desert shrubs, we studied the liquefaction of Salixpsammophila and Caragana intermedia in the presence of phenol and used FTIR analysis on unliquefied and liquefied S. psammophila and C. intermedia. The results showed that the liquefaction effects are enhanced with an increase in temperature, catalyst content and liquid ratio. FTIR analysis proved that more active functional groups appeared after S. psammophila and C. intermedia were liquefied in the presence of phenol. These results can provide a theoretical basis for the further utilization of liquefied S. psammophila and C. intermedia and the development of desert shrubs in a new utilization field.
