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| 祁连山不同海拔氮磷循环细菌数量变化特征 | |
| 引用本文： | 台喜生,杨秀丽,刘光琇,薛林贵,张勇,陈拓,张威,伍修锟,毛文梁.祁连山不同海拔氮磷循环细菌数量变化特征[J].冰川冻土,2014,36(1):214-221. |
| 作者姓名： | 台喜生 杨秀丽 刘光琇 薛林贵 张勇 陈拓 张威 伍修锟 毛文梁 |
| 作者单位： | 1. 中国科学院 寒区旱区环境与工程研究所 沙漠与沙漠化重点实验室, 甘肃 兰州 730000; 2. 兰州交通大学 化学与生物工程学院, 甘肃 兰州 730070; 3. 河西学院, 甘肃 张掖 734000 |
| 基金项目： | 国家自然科学基金项目（91025002；31070357；31100365）；中国科学院重点部署项目（KZZD-EW-04-05）资助 |
| 摘 要： | 祁连山植被的水源涵养作用对于维持黑河的流量至关重要,地下微生物参与生态系统的物质和能量循环,维持了地上植被的稳定,因而具有重要的生态作用.研究分析了祁连山冰沟流域不同海拔梯度上硝化细菌、反硝化细菌、固氮细菌、解磷细菌和植酸矿化细菌的数量随土壤深度的变化规律.结果表明:随土壤深度的增加,氮磷循环细菌的数量下降;随海拔升高,硝化细菌相对减少,而反硝化细菌和固氮细菌呈增多的趋势.典范对应分析(CCA)显示,硝化细菌的数量变化主要受地下生物量和土壤pH值的影响,而反硝化细菌、固氮细菌、解磷细菌和植酸矿化细菌主要受植被盖度、地上生物量和土壤含水量的影响.聚类分析表明,低海拔(E1-2 905 m和E2-3 128 m)浅层土壤(0~40 cm)聚类,而其深层土壤(60 cm)与高海拔(E3-4 130 m)土壤聚类,说明高海拔处土壤发育与低海拔处深层土壤的早期发育相类似.研究表明,高山地区氮磷循环细菌数量的变化受到海拔主导下植被和土壤理化因子的共同作用. |
| 关 键 词： | 氮磷循环细菌 祁连山 海拔 土壤理化因子 植被 |
| 收稿时间： | 2013-08-08 |
Variations of N- and P-cycling bacterial populations along with altitude in the Qilian Mountains |
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| TAI Xisheng,YANG Xiulin,LIU Guangxiu,XUE Lingui,ZHANG Yong,CHEN Tuo,ZHANG Wei,WU Xiukun,MAO Wenliang.Variations of N- and P-cycling bacterial populations along with altitude in the Qilian Mountains[J].Journal of Glaciology and Geocryology,2014,36(1):214-221. | |
| Authors: | TAI Xisheng YANG Xiulin LIU Guangxiu XUE Lingui ZHANG Yong CHEN Tuo ZHANG Wei WU Xiukun MAO Wenliang |
| Institution: | 1. Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; 2. School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China; 3. Hexi College, Zhangye 734000, Gansu, China |
| Abstract: | The Binggou is located in the upper reaches of the Heihe River, Southern Qilian Mountains. Vegetation plays an important role in sustaining a stable runoff of the Heihe River in this region. There are many researches about hydrology and vegetation in the region, but less about underground microorganisms. In this study, the functional microorganisms participated in N and P cycles are focused on. A few vegetation quadrats were investigated in situ and soil samples were taken at three altitudes. The soil physicochemical properties were determined and the functional microorganisms including nitrifier, denitrifier, diazotroph, phosphate-solubilizing bacteria (PSB) and phytate-mineralizing bacteria (PMB) were cultured in laboratory. Colony forming units (cfu) of these functional microorganisms were counted. It is found that number of the functional microorganisms decreases with soil depth. Interestingly, number of nitrifier decreases and that of denitrifier and diazotroph increases with altitudes (2 905 m-4 130 m a. s. l.). Canonical correspondence analysis (CCA) shows that number of nitrifier is mainly affected by the underground biomass and the soil pH value, while number of denitrifier, diazotroph, PSB and PMB correlates with soil moisture, vegetation coverage and aboveground biomass. Hierarchical cluster analysis indicates that the superficial soil layers (0-40 cm) at lower altitudes (E1-2 905 m and E2-3 128 m) will cluster together. The deeper soils (60 cm) at lower altitude cluster with the soils at higher altitude (E3-4 130 m). This study demonstrates that number of the functional microorganisms mainly depends on altitude and its covariables in alpine soils. |
| Keywords: | N- and P-cycling bacteria Qilian Mountains altitude soil physicochemical factors vegetation |
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