scholarly journals Age and Species of Eucalyptus Plantations Affect Soil Microbial Biomass and Enzymatic Activities

2020 ◽  
Vol 8 (6) ◽  
pp. 811 ◽  
Author(s):  
Jie Xu ◽  
Bing Liu ◽  
Zhao-lei Qu ◽  
Yang Ma ◽  
Hui Sun
Keyword(s):  
Microbial Biomass ◽  
Enzyme Activities ◽  
Fungal Biomass ◽  
Soil Microbial Biomass ◽  
Extracellular Enzymes ◽  
Eucalyptus Species ◽  
Eucalyptus Plantation ◽  
Soil Microbial ◽  
Eucalyptus Plantations ◽  
Plantation Age

Soil microorganisms and extracellular enzymes play important roles in soil nutrient cycling. Currently, China has the second-largest area of eucalyptus plantations in the world. Information on the effects of eucalyptus age and species of trees on soil microbial biomass and enzyme activities, however, is limited. In this paper, the soil microbial biomass and enzyme activities were studied in eucalyptus plantations with different ages (1 and 5+ years) and species of trees (E. urophylla×E. grandis, E. camaldulens and E. pellita) in South China. The results showed that both plantation age and eucalyptus species could affect the total microbial biomass and fungal biomass, whereas the bacterial biomass was affected only by plantation age. The fungal biomass and the fungi-to-bacteria ratio significantly increased along with increasing plantation age. Similarly, the plantation age and eucalyptus species significantly affected the enzyme activities associated with carbon cycling (β-xylosidase, β-d-glucuronidase, β-cellobiosidase and β-glucosidase). The activities of β-d-glucuronidase and β-glucosidase were significantly higher in the E. camaldulens plantation. The enzymes involved in nitrogen (N-acetyl-glucosamidase) and sulfur (sulfatase) cycling were only affected by the eucalyptus plantation age and species, respectively. The results highlight the importance of the age and species of eucalyptus plantations on soil microbial activities.

scholarly journals Changes in Soil Microbial Biomass, Community Composition, and Enzyme Activities After Half-Century Forest Restoration in Degraded Tropical Lands

Forests ◽  
2019 ◽  
Vol 10 (12) ◽  
pp. 1124 ◽  
Author(s):  
Huiling Zhang ◽  
Xin Xiong ◽  
Jianping Wu ◽  
Jianqi Zhao ◽  
Mengdi Zhao ◽  
...  
Keyword(s):  
Microbial Biomass ◽  
Enzyme Activities ◽  
Soil Microbial Biomass ◽  
Extracellular Enzymes ◽  
Soil Depth ◽  
Microbial Properties ◽  
Soil Microbial ◽  
Eucalyptus Forest ◽  
Different Seasons ◽  
Microbial Groups

Soil carbon (C) sequestration and stabilization are determined by not only the C input to the soil but also the decomposition rate of soil organic matter (SOM), which is mainly mediated by soil microbes. Afforestation, an effective practice to restore forests from degraded or bare lands, may alter soil microbial properties, and thus soil C and nitrogen (N) dynamics. The aim of this study was to investigate the impacts of different afforestation strategies on soil microbial compositions and activities after afforestation for half a century. Soil samples were collected from two afforested sites (i.e., a restored secondary forest (RSF) and a managed Eucalyptus forest (MEP)) and two reference sites (i.e., a nearby undisturbed forest (UF), representing the climax vegetation and a bare land (BL), representing the original state before restoration) in south China. We quantified the soil microbial biomass, microbial community compositions, and activities of nine extracellular enzymes at different soil depths and in different seasons. Results showed that the soil microbial biomass, all the main soil microbial groups, and the activities of all extracellular enzymes were significantly increased after afforestation compared to the BL sites, while the ratios of fungi/bacteria (F/B), specific enzyme activities, and the ecoenzymatic stoichiometry were significantly decreased regardless of the season and soil depth. Between the two afforested sites, these microbial properties were generally higher in the RSF than MEP. However, the microbial properties in the RSF were still lower than those in the UF, although the differences varied with different seasons, soil depths, and microbial groups or enzymes. Our findings demonstrated that afforestation might significantly improve microbial properties. Afforestation is more effective in mixed-species plantation than in the monoculture Eucalyptus plantation but needs a much longer time to approach an equivalent level to the primary forests.

SOIL MICROBIAL BIOMASS AND ENZYME ACTIVITIES RESPONSE TO COPPER AND MOLYBDENUM POLLUTION IN THE VICINITY OF ZANGEZUR COPPER AND MOLYBDENUM COMBINE, ARMENIA

2020 ◽  
Vol 54 (3 (253)) ◽  
pp. 235-245
Author(s):  
K.A. Ghazaryan ◽  
H.S. Movsesyan
Keyword(s):  
Microbial Biomass ◽  
Enzymatic Activity ◽  
Enzyme Activities ◽  
Soil Microbial Biomass ◽  
Negative Impact ◽  
Chemical Elements ◽  
Extracellular Enzyme ◽  
Soil Biological Activity ◽  
Soil Enzymatic Activity ◽  
Soil Microbial

The aim of this study was to define a relationship between heavy metal (Cu, Mo) pollution of soil and various extracellular enzyme activities. Six enzymatic activities involved in cycles of carbon, nitrogen, phosphorus and sulfur (β-glucosidase, chitinase, leucine-aminopeptidase, acid phosphomonoesterase, alkaline phosphomonoesterase, and arylsulphatase) as well as microbial biomass were determined in soil samples collected in the surroundings of Zangezur Copper and Molybdenum Combine. The investigations showed that pollution of soil with copper and molybdenum led to a decrease in microbial biomass and soil enzymatic activity, which in turn had a negative impact on cycles of chemical elements, in particular C, P, N and S. This gives reason to conclude that the changes in soil microbial biomass and enzymatic activity may act as indicators of soil biological activity and quality.

Effects of nitrogen deposition on soil microbial biomass and enzyme activities in Castanopsis carlesii natural forests in subtropical regions

2017 ◽  
Vol 37 (1) ◽  
Author(s):  
周嘉聪 ZHOU Jiacong ◽  
刘小飞 LIU Xiaofei ◽  
郑永 ZHENG Yong ◽  
纪宇皝 JI Yuhuang ◽  
李先锋 LI Xianfeng ◽  
...  
Keyword(s):  
Microbial Biomass ◽  
Nitrogen Deposition ◽  
Enzyme Activities ◽  
Soil Microbial Biomass ◽  
Natural Forests ◽  
Soil Microbial

Effect of desertification on soil microbial biomass and enzyme activities in Maqu alpine meadow

2016 ◽  
Vol 36 (18) ◽  
Author(s):  
何芳兰 HE Fanglan ◽  
金红喜 JIN Hongxi ◽  
王锁民 WANG Suoming ◽  
韩生慧 HAN Shenghui ◽  
曾荣 ZENG Rong ◽  
...  
Keyword(s):  
Microbial Biomass ◽  
Enzyme Activities ◽  
Soil Microbial Biomass ◽  
Alpine Meadow ◽  
Soil Microbial

Effects of different altitudes on soil microbial biomass and enzyme activities in Pinus taiwanensis forests on Daiyun Mountain, Fujian Province

2019 ◽  
Vol 39 (8) ◽  
Author(s):  
赵盼盼 ZHAO Panpan ◽  
周嘉聪 ZHOU Jiacong ◽  
林开淼 LIN Kaimiao ◽  
林伟盛 LIN Weisheng ◽  
袁萍 YUAN Ping ◽  
...  
Keyword(s):  
Microbial Biomass ◽  
Enzyme Activities ◽  
Soil Microbial Biomass ◽  
Fujian Province ◽  
Soil Microbial ◽  
Different Altitudes

Interactive effect of vegetation and climate warming on total microbial and fungal biomass in soil

2020 ◽  
Author(s):  
Maria Udovenko ◽  
Vusal Guliyev ◽  
Evgenia Blagodatskaya
Keyword(s):  
Climate Change ◽  
Land Use ◽  
Microbial Biomass ◽  
Fungal Biomass ◽  
Soil Microbial Biomass ◽  
Environmental Changes ◽  
Interactive Effect ◽  
Environmental Research ◽  
Research Station ◽  
Soil Microbial

<p>Soil microbiota ensuring sustainable functioning of terrestrial ecosystems is strongly dependent on climatic conditions and vegetation type. Even within the same climatic zone, active land use alters the size, structure and functioning of the microbial community. We hypothesized that land use effect on soil microbial biomass will be more pronounced under impact of global warming. We also tested whether the biomass of specific microbial group (e.g., fungi) is more sensitive to environmental changes than total microbial biomass.</p><p>We proved these hypotheses in the experiments based on Global Change Experimental Facility platform, located at the field research station of the Helmholtz-Centre for Environmental Research in Bad Lauchstädt near Halle, Saxon-Anhalt, Germany. Experimental setup included 50 plots, located in 10 blocks (5 plots per block). Five blocks are under ambient climate and the rest 5 blocks are subjected to a realistic climate change treatment (under conditions predicted by several models of climate change in Central Germany for 2050–2080 period). Five land use types were established in every block: conventional farming; organic farming; intensively used meadow, extensively used meadow and extensively used pasture. We determined soil microbial biomass and its fungal component by chloroform fumigation-extraction method and by ergosterol content, respectively. We found that fungal biomass was more sensitive to intensive land use for crop production than to climate change. The possible mechanisms of such a sensitivity will be discussed.</p>

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