Drought effects on microbial biomass and enzyme activities in the rhizosphere of grasses depend on plant community composition

Sanaullah, Muhammad; Blagodatskaya, Еvgenia; Chabbi, Abad; Rumpel, Cornélia; Kuzyakov, Yakov

doi:10.1016/j.apsoil.2011.02.004

Cited by 200 publications

(120 citation statements)

References 40 publications

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“…Phenol oxidase and peroxidase not only reflect soil quality, but also correspond to the allelochemicals produced by Pinus (Cao et al, 2006) and Eucalyptus Fu, 2009, 2010). Cellobiohydrolase breaks cellulose chains into smaller units, and the enhanced activity of cellobiohydrolase could indicate high litter or root turnover in the soils (Sanaullah et al, 2011). In the study, the activity of soil acid phosphatase, phenol oxidase, and peroxidase increased gradually with the stand age of the Eucalyptus plantations.…”

Section: Discussionmentioning

confidence: 80%

Soil microbial community structure and function responses to successive planting of Eucalyptus

Chen

Zheng

Zhang

et al. 2013

Journal of Environmental Sciences

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Many studies have shown soil degradation after the conversion of native forests to exotic Eucalyptus plantations. However, few studies have investigated the long-term impacts of short-rotation forestry practices on soil microorganisms. The impacts of Eucalyptus successive rotations on soil microbial communities were evaluated by comparing phospholipid fatty acid (PLFA) abundances, compositions, and enzyme activities of native Pinus massoniana plantations and adjacent 1st, 2nd, 3rd, 4th generation Eucalyptus plantations. The conversion from P. massoniana to Eucalyptus plantations significantly decreased soil microbial community size and enzyme activities, and increased microbial physiological stress. However, the PLFA abundances formed "∪" shaped quadratic functions with Eucalyptus plantation age. Alternatively, physiological stress biomarkers, the ratios of monounsaturated to saturated fatty acid and Gram+ to Gram-bacteria, formed "∩" shaped quadratic functions, and the ratio of cy17:0 to 16:1ω7c decreased with plantation age. The activities of phenol oxidase, peroxidase, and acid phosphatase increased with Eucalyptus plantation age, while the cellobiohydrolase activity formed "∪" shaped quadratic functions. Soil N:P, alkaline hydrolytic nitrogen, soil organic carbon, and understory cover largely explained the variation in PLFA profiles while soil N:P, alkaline hydrolytic nitrogen, and understory cover explained most of the variability in enzyme activity. In conclusion, soil microbial structure and function under Eucalyptus plantations were strongly impacted by plantation age. Most of the changes could be explained by altered soil resource availability and understory cover associated with successive planting of Eucalyptus. Our results highlight the importance of plantation age for assessing the impacts of plantation conversion as well as the importance of reducing disturbance for plantation management.

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Section: Discussionmentioning

confidence: 80%

Soil microbial community structure and function responses to successive planting of Eucalyptus

Chen

Zheng

Zhang

et al. 2013

Journal of Environmental Sciences

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“…Our results provide evidence that the dependence of SCE on soil moisture can be altered by precipitation manipulation. Changes in soil moisture influences the allocation of assimilates in the plant-soil system, and alters microbial biomass and enzymatic activities in the rhizosphere (Sanaullah et al, 2011), thus feeding back to the shifts in the SCE-moisture response function.…”

Section: Discussionmentioning

confidence: 99%

Response of soil CO2 efflux to precipitation manipulation in a semiarid grassland

Wei

Zhang

Liu

et al. 2016

Journal of Environmental Sciences

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Soil CO 2 efflux (SCE) is an important component of ecosystem CO 2 exchange and is largely temperature and moisture dependent, providing feedback between C cycling and the climate system. We used a precipitation manipulation experiment to examine the effects of precipitation treatment on SCE and its dependences on soil temperature and moisture in a semiarid grassland. Precipitation manipulation included ambient precipitation, decreased precipitation (− 43%), or increased precipitation (+ 17%). The SCE was measured from July 2013 to December 2014, and CO 2 emission during the experimental period was assessed.The response curves of SCE to soil temperature and moisture were analyzed to determine whether the dependence of SCE on soil temperature or moisture varied with precipitation manipulation. The SCE significantly varied seasonally but was not affected by precipitation treatments regardless of season. Increasing precipitation resulted in an upward shift of SCE-temperature response curves and rightward shift of SCE-moisture response curves, while decreasing precipitation resulted in opposite shifts of such response curves. These shifts in the SCE response curves suggested that increasing precipitation strengthened the dependence of SCE on temperature or moisture, and decreasing precipitation weakened such dependences. Such shifts affected the predictions in soil CO 2 emissions for different precipitation treatments. When considering such shifts, decreasing or increasing precipitation resulted in 43 or 75% less change, respectively, in CO 2 emission compared with changes in emissions predicted without considering such shifts. Furthermore, the effects of shifts in SCE response curves on CO 2 emission prediction were greater during the growing than the non-growing season.

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“…There are three main mechanisms that could increase SOC decomposition after conversion: (1) plowing leading to better aeration, (2) removal of plant biomass by annual harvesting or grazing, and (3) decrease of belowground C input by roots and rhizodeposition. Additionally, other processes such as changes of water budget (Sanaullah et al 2011), aggregate destruction (Chen et al 2007), fertilization, and decreasing soil C/N ratio may be important for soil C losses.…”

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confidence: 99%

Land use change decreases soil carbon stocks in Tibetan grasslands

Qiao

Cao

et al. 2015

Plant Soil

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Backgrounds and aims Land use is an important factor affecting soil organic carbon (SOC) dynamics and can produce positive C climate feedback, but its effects remain unknown for Tibetan ecosystems. Methods Recent land use changes have converted the traditional winter Kobresia pastures of nomads in the northeastern Tibetan Plateau to Elymus pastures or even to cropland. Detailed SOC measurements up to 30-cm depth were combined with analysis of δ 13 C, δ 15 N, bulk density, microbial C, and N contents in three land use types. Results Bulk density was decreased by conversion from Kobresia pasture to cropland but increased by conversion to Elymus pasture. The loss of 1 % of SOC caused by land use change leads to δ 13

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Drought effects on microbial biomass and enzyme activities in the rhizosphere of grasses depend on plant community composition

Cited by 200 publications

References 40 publications

Soil microbial community structure and function responses to successive planting of Eucalyptus

Soil microbial community structure and function responses to successive planting of Eucalyptus

Response of soil CO2 efflux to precipitation manipulation in a semiarid grassland

Land use change decreases soil carbon stocks in Tibetan grasslands

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