作為陸地生態(tài)系統(tǒng)的重要組成之一,，土壤微生物在養(yǎng)分循環(huán),、凋落物分解和植物多樣性維持等方面發(fā)揮著重要作用,。前人的研究表明,，土壤微生物的群落結(jié)構(gòu)和多樣性在小區(qū)或局部尺度上主要受植物物種組成和土壤屬性的影響。但是,，在較大的空間尺度上土壤微生物的功能多樣性受哪些因素驅(qū)動(dòng)我們了解很少,。這對(duì)于評(píng)價(jià)土壤微生物群落如何響應(yīng)全球變化及理解全球變化對(duì)陸地生態(tài)系統(tǒng)產(chǎn)生的潛在影響具有重要意義。
中科院華南植物園恢復(fù)生態(tài)學(xué)科研團(tuán)隊(duì)劉占鋒博士與中國(guó)科學(xué)院生態(tài)環(huán)境研究中心,、內(nèi)蒙古呼倫貝爾環(huán)境研究所的專家合作,，在內(nèi)蒙古呼倫貝爾草原研究了區(qū)域尺度上土壤微生物功能多樣性的驅(qū)動(dòng)機(jī)制。研究人員發(fā)現(xiàn),，在區(qū)域尺度上植物群落結(jié)構(gòu)和多樣性不再是影響土壤微生物群落的重要驅(qū)動(dòng)因子,。在呼倫貝爾草原土壤微生物的功能多樣性在區(qū)域尺度上主要受植被的生物量、土壤含水量和土壤N/P比值的影響,。由于溫帶草原植被生物量主要受土壤水分和氮素的可獲得性的限制,，植被生物量可以很好地指示資源的可獲得性。因此,，該研究認(rèn)為在溫帶草原土壤微生物的功能多樣性在區(qū)域尺度上主要受資源的可獲得性驅(qū)動(dòng),。
該研究結(jié)果已發(fā)表在土壤科學(xué)研究領(lǐng)域權(quán)威雜志Soil Biology and Biochemistry 上。根據(jù)ScienceDirect的統(tǒng)計(jì)結(jié)果,，該論文成為Soil Biology and Biochemistry雜志今年第一季度的25篇熱點(diǎn)文章之一,，該文章研究結(jié)果已被國(guó)內(nèi)外同行所關(guān)注。(生物谷Bioon.net)
生物谷推薦原文出處：
Soil Biology and Biochemistry doi:10.1016/j.soilbio.2009.11.027
Plant biomass, soil water content and soil N:P ratio regulating soil microbial functional diversity in a temperate steppe: A regional scale study
Zhanfeng Liua, b, Bojie Fua, Xiaoxuan Zhenga and Guohua Liua, ,
Soil microorganisms are influenced by various abiotic and biotic factors at the field plot scale. Little is known, however, about the factors that determine soil microbial community functional diversity at a larger spatial scale. Here we conducted a regional scale study to assess the driving forces governing soil microbial community functional diversity in a temperate steppe of Hulunbeir, Inner Mongolia, northern China. Redundancy analysis and regression analysis were used to examine the relationships between soil microbial community properties and environmental variables. The results showed that the functional diversity of soil microbial communities was correlated with aboveground plant biomass, root biomass, soil water content and soil N: P ratio, suggesting that plant biomass, soil water availability and soil N availability were major determinants of soil microbial community functional diversity. Since plant biomass can indicate resource availability, which is mainly constrained by soil water availability and N availability in temperate steppes, we consider that soil microbial community functional diversity was mainly controlled by resource availability in temperate steppes at a regional scale.
