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Effects of vegetation type, fine and coarse roots on soil microbial communities and enzyme activities in eastern Tibetan plateau
Catena ( IF 6.2 ) Pub Date : 2020-05-30 , DOI: 10.1016/j.catena.2020.104694
Lixia Wang , Xueyong Pang , Na Li , Kaibin Qi , Junsheng Huang , Chunying Yin

Microbial communities and enzyme activity in soil are the functional link through which the vegetation type occupying a site, may alter soil processes fundamental to nutrient cycling. Roots are known to regulate soil carbon (C) input, but the impacts of different classes of roots on soil microbial community (as indexed by PLFAs) and enzyme activity are uncertain. Thus, the aim of this study was to assess how different classes of woody roots (fine roots ≤ 2 mm and coarse roots > 2 mm) in Pinus tabulaeformis (PT) and Cercidiphyllum japonicum (CJ) plantations influence the microbial community and enzyme potential activity, as compared to natural shrubland.

In the fine root rhizosphere soil, the PT and CJ plantations had lower abundances of fungal and gram-positive bacterial PLFAs, and the PT plantation had significantly lower acid phosphatase, dehydrogenase, and higher invertase activities compared to the shrubland. The shrubland and CJ plantation had distinctly higher soil microbial parameters (total, fungal, and arbuscular mycorrhizal fungal PLFAs) and enzyme activities (urease, acid phosphatase, invertase, β-glucosidase, and dehydrogenase) in the fine root rhizosphere than in the coarse root rhizosphere and bulk soils. We concluded that soil organic carbon (SOC) (much more significant) and total nitrogen (TN) were the main factors in regulating soil microbial community and enzymes.

Our findings demonstrate the importance of fine roots in regulating microbial community and function. Our results also highlight that differences between fine root rhizosphere and coarse root rhizosphere, or bulk soil are dependent on vegetation type.



中文翻译:

植被类型,细根和粗根对青藏高原东部土壤微生物群落和酶活性的影响

土壤中的微生物群落和酶活性是植被类型占据一个站点的功能链接,可以改变土壤养分循环的基础过程。已知根可以调节土壤碳(C)的输入,但是尚不确定不同类别的根对土壤微生物群落(以PLFAs指数)和酶活性的影响。因此,本研究的目的是评估油松(PT)和日本Cercidiphyllum japonicum)人工林中不同类别的木本根(细根≤2 mm,粗根> 2 mm)如何影响微生物群落和酶潜在活性。 ,与天然灌木林相比。

在细根的根际土壤中,与灌木林相比,PT和CJ人工林的真菌和革兰氏阳性细菌PLFA的丰度较低,而PT人工林的酸性磷酸酶,脱氢酶和较高的转化酶活性明显较低。灌木和CJ人工林的根际土壤微生物参数(总,真菌和丛枝菌根真菌PLFA)和酶活性(脲酶,酸性磷酸酶,转化酶,β-葡萄糖苷酶和脱氢酶)明显高于粗根。根际和块状土壤。我们得出结论,土壤有机碳(SOC)(更为重要)和总氮(TN)是调节土壤微生物群落和酶的主要因素。

我们的发现证明了细根在调节微生物群落和功能中的重要性。我们的结果还突出表明,细根根际和粗根根际或散装土壤之间的差异取决于植被类型。

更新日期:2020-05-30
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