Influence of soil properties on fluorescein diacetate hydrolyzing activity under different agro-ecosystems
TL;DR: In this paper, the FDHA in both soil pretreatments showed positive correlation with organic matter (0.98∗∗ for field moist soil and 0.92∗ ∗ for air-dried soil) and clay content.
Abstract: Fluorescein diacetate hydrolyzing activity (FDHA) of soils, both in field moist and air dried, of different agro-ecosystems in alluvial soil was studied. Field moist soils recorded higher values than in air-dried soils, but they showed significant positive correlation (0.93∗∗). FDHA in both soil pretreatments showed positive correlation with organic matter (0.98∗∗ for field moist soil and 0.92∗∗ for air-dried soil) and clay content (0.85∗∗ for field moist soil and 0.82∗ for air-dried soil) of the soils. Multiple regression analysis showed that the stabilization of FDHA in the studied soils was due to organic matter-enzyme complex. Among the organic matter fractions, humus C plays dominating role to control the FDHA of the soils.
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TL;DR: Though acid mine drainage affected soils had higher microbial biomass and activities due to higher organic matter content than those of the baseline soils, the ratios of microbial parameters/organic carbon indicated suppression of microbial growth and activitiesdue to acidity stress.
30 citations
TL;DR: Overall, there was a tendency for increased soil major nutrients and microbial traits with Parthenium weed invasion, and the magnitude and/or direction of the weed invasion is affected by complex interactions among environmental factors that might change across invaded habitats and survey periods, making broad generalizations un-informative for management.
Abstract: Parthenium hysterophorus L. (Asteraceae) is an annual weed of worldwide significance in grasslands and riparian corridors. In view of the invasibility and known allelochemical properties exhibited by its presence in a given habitat, the weed is hypothesized to change soil properties significantly.
16 citations
Cites methods from "Influence of soil properties on flu..."
...…activities involve in decomposition of soil organic matter, such as non-specific esterases, proteases, and lipases activities) was assayed using methods as described by Chakrabarti and Bhattacharyya (2006) on 1 g of soil sample mixed with 60 mM sodium phosphate buffer (pH 7.6) and 5.0 mM FDA....
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01 Aug 2009
TL;DR: In this article, the effects of municipal compost (MC), poultry litter (PL), and cover crops of spring oats and red clover (RC) on soil enzyme activities, and soil bacterial community-level physiological profiling (CLPP) in a Mexico silt loam in North Central Missouri, USA.
Abstract: Soil microbial activity and diversity are affected by organic sources applied to improve soil quality and fluctuate seasonally. We investigated the effects of municipal compost (MC), poultry litter (PL), and cover crops of spring oats and red clover (RC) on soil enzyme activities, and soil bacterial community-level physiological profiling (CLPP) in a Mexico silt loam in North Central Missouri, USA. Temporal patterns of these parameters were observed by periodic five soil sampling from spring to fall over a two year period. MC increased soil dehydrogenase (DH) activity consistently beginning about three months after MC application; fluorescein diacetate (FDA) hydrolytic activity significantly began to increase by the September of the first year but fluctuated during the following period. DH activity responded more directly to the amount or properties of organic residues in soils while FDA hydrolysis and CLPP were generally influenced by composition of organic sources, and enzyme activities and CLPP showed seasonal variation, which depended on organic sources and soil moisture. MC and cover crops may be useful organic sources for enhancing general soil microbial activity and altering soil microbial diversity, respectively. Because microbial activities and diversity are dynamic and subject to seasonal changes, the effects of organic amendments on these parameters should be investigated frequently during a growing season.
1 citations
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76 citations
"Influence of soil properties on flu..." refers methods in this paper
...Cation exchange capacity (CEC) was determined according to the method of Sankaram (1966)....
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...Organic carbon (C) was determined by wet digestion method as described by Nelson and Sommers (1982) and total nitrogen (N) by micro-Kjeldahl method as described by Sankaram (1966)....
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TL;DR: In this paper, it was shown that carboxyl groups, not phenolic groups, are responsible for the influence of humic acid on enzyme activity, and that the effect of the sample on the activities of four proteolytic enzymes was investigated.
Abstract: Humic acids, methylated with diazomethane, no longer inhibit or stimulate proteolytic enzymes. If an exhaustively methylated humic acid sample is hydrolysed to different degrees, there is a direct relationship between the number of carboxyl groups freed and the effect of the sample on the activities of four proteolytic enzymes. When fully hydrolysed the humic acid sample has essentially the same effect as the untreated humic acid, although the phenolic groups are still methylated. These results suggest that carboxyl groups, not phenolic groups, are responsible for the influence of humic acids on enzyme activity.
35 citations
"Influence of soil properties on flu..." refers background in this paper
...Enzymes are ionically (Buttler & Ladd 1969) and covalently bound (Tate 2000) to colloidal soil organic matter or associated with clay particles....
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TL;DR: In this article, Urease activity (by buffer and non-buffer method) of different agro-ecosystems in alluvial soil was studied and multiple regression analysis showed that the stabilization of urease activation in the soils studied was due to an organic matter humus complex.
Abstract: Urease activity (by buffer and non-buffer method) of soils of different agro-ecosystems in alluvial soil was studied. Urease activity by buffer method records a higher value than the non-buffer method. Both the methods showed significant positive correlation (0.99**) between each other. Urease activity by both methods showed positive correlation with organic matter (0.88** and 0.89**, buffer method) and clay content (0.91** and 0.83*, non-buffer method)) of the soils. Multiple regression analysis showed that the stabilization of urease activity in the soils studied was due to an organic matter – enzyme complex. Among the organic matter humus C plays a dominating role to control the urease activity of the soils.
15 citations
"Influence of soil properties on flu..." refers background in this paper
...However, little is known about the correlation between enzyme activities with soil organic matter fractions such as water-soluble organic carbon, carbohydrate and humus carbon contents (Chakrabarti et al. 2004)....
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TL;DR: In this article, 14 agricultural soils from various areas of Tuscany were characterized by a range of measurements indicative of soil biological activity, and the objective of their research was to identify soil parameters suitable as indicators for evaluating their quality.
Abstract: Fourteen agricultural soils from various areas of Tuscany were characterized by a range of measurements indicative of soil biological activity. The objective of our research was to identify soil parameters suitable as indicators for evaluating their quality. In general, enzyme activities were found to vary widely, with the highest activity for each enzyme being distributed among only five of the 14 soils studied. The narrowest range (14-fold) in enzyme activities for the various soils was observed for catalase and the widest range (577-fold) for g -glucosidase. Biomass C and, among the measured enzyme activities, amylase, were well correlated with total organic carbon, total N, cation and anion exchange capacity. Positive correlations were found between the maximum water holding capacity and dehydrogenase, amylase, biomass C, FDA hydrolytic activity, the biological index of fertility and the enzyme activity number, so showing that soil moisture may play an important role in affecting soil biological chara...
6 citations
"Influence of soil properties on flu..." refers methods in this paper
...FDHA has been used to detect the effects of different soil management (Perucci & Scarponi 1994; Bandick & Dick 1999; Ghosh et al. 2004) and found to vary widely in different ecosystems as well as in similar ecosystems in different zones (Levi-Minzi et al. 2002)....
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