察布查尔县草原土壤微生物量与土壤理化性质相关性研究

发布时间：2018-11-12 16:03

【摘要】：微生物不仅是土壤养分的转化者,同时也是养分的一种存在方式,其生物质量为微生物量。微生物量是土壤养分转化和循环的动力也是养分的库和源,微生物量对环境变化敏感,是土壤质量变化的重要指标。本研究以新疆伊犁察布查尔县1191~2656m海拔草原为研究对象,使用氯仿熏蒸提取法研究不同海拔草原土壤微生物量及其活性的变异特征,研究结果表明微生物量碳(21.05~331.58mg/kg)、微生物量氮(8.75~95.61mg/kg)均为土壤表层大于中、底层,各海拔及土层间差异显著(P0.05),在1191~2216m海拔区间微生物量碳、氮随海拔的增加而增加,并在2216m海拔达到最大值(331.58mg/kg和95.61mg/kg),其后2216~2656m海拔区间微生物量碳、氮显著降低(21.05mg/kg和12.41mg/kg),这可能与随海拔的增加引起此海拔区间气候、降水量、植被类型、植被数量等环境条件的变化有关;通过相关性分析得知微生物量碳、氮、碳氮比彼此间正相关(P0.05);0~20cm土层微生物量碳与含水量呈正显著性相关(P0.05,r=0.755*),微生物量与海拔、容重、有机质、碱解氮呈正相关(P0.05),与pH值、全氮、碳氮比负相关(P0.05)。20~40cm土层微生物量碳与碱解氮呈显著性正相关(P0.05,r=0.829*),微生物量与海拔、全氮正相关(P0.05),与碳氮比负相关(P0.05)。40~60cm土层微生物量与海拔、碳氮比呈负相关(P0.05),与有机质、碱解氮、全氮呈正相关(P0.05)。土壤微生物量可以反映土壤肥力的变化,作为评价土壤肥力的生物学指标。
[Abstract]:Microorganisms are not only the transformants of soil nutrients, but also a way of nutrient existence, and their biological quality is microbial biomass. Microbial biomass is not only the motive force of soil nutrient transformation and cycling, but also the reservoir and source of soil nutrients. Microbial biomass is sensitive to environmental changes and is an important indicator of soil quality change. In this study, chloroform fumigation extraction method was used to study the variation characteristics of soil microbial biomass and its activity in different elevations of Chabuchar County, Yili, Xinjiang, at an altitude of 1191 and 2656m, and chloroform fumigation extraction method was used to study the variation of soil microbial biomass and its activity. The results showed that microbial biomass carbon (21.05~331.58mg/kg) and microbial biomass nitrogen (8.75~95.61mg/kg) were significantly different in surface layer and bottom layer of soil (P0.05). Nitrogen increased with the increase of altitude, and reached the maximum value (331.58mg/kg and 95.61mg/kg) at 2216m, followed by microbial biomass carbon (MMC) and significant decrease of nitrogen (21.05mg/kg and 12.41mg/kg) in the range of 2216 ~ 2656m above sea level. This may be related to the change of climate, precipitation, vegetation type, vegetation quantity and so on. The ratio of microbial biomass carbon, nitrogen and carbon to nitrogen was positively correlated with each other by correlation analysis (P0.05). There was a positive correlation between microbial biomass carbon and water content in 0~20cm soil layer (P 0.05), and a positive correlation between microbial biomass and elevation, bulk density, organic matter, alkali-hydrolyzed nitrogen (P0.05), pH value and total nitrogen. C / N ratio was negatively correlated (P0.05). There was a significant positive correlation between microbial biomass carbon and alkali-hydrolyzed nitrogen in 20~40cm soil layer (P 0.05), but there was a positive correlation between microbial biomass and altitude, total nitrogen (P0.05), total nitrogen (P 0.05), total nitrogen (P 0.05). 40~60cm soil microbial biomass was negatively correlated with altitude, C / N ratio (P0.05), and positively correlated with organic matter, alkali-hydrolyzed nitrogen and total nitrogen (P0.05). Soil microbial biomass can reflect the change of soil fertility as a biological index to evaluate soil fertility.
【作者单位】：东北林业大学林学院;新疆农业大学草业与环境科学学院;
【基金】：国家自然科学基金项目(41461048)资助
【分类号】：S812.2

【相似文献】