Spatial variation of soil enzyme activities and microbial ... - USDA ARS
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Spatial variation of soil enzyme activities and microbial ... - USDA ARS
Jul 7, 2005 - Nancy W. Mungai . Peter P. Motavalli . Robert J. Kremer . ... Department of Soil Science, Egerton University,. P.O. Box 536 Njoro, Kenya e-mail: ...
Biol Fertil Soils (2005) 42: 129–136 DOI 10.1007/s00374-005-0005-1
ORIGINA L PA PER
Nancy W. Mungai . Peter P. Motavalli . Robert J. Kremer . Kelly A. Nelson
Spatial variation of soil enzyme activities and microbial functional diversity in temperate alley cropping systems Received: 10 August 2003 / Revised: 14 March 2005 / Accepted: 14 March 2005 / Published online: 7 July 2005 # Springer-Verlag 2005
Abstract Spatially dependent patterns in microbial properties may exist in temperate alley cropping systems due to differences in litter quality and microclimate in areas under trees compared to those in the alleys. The effect of tree row location was evaluated for its impact on soil enzyme activities and Biolog substrate use patterns. Soils were sampled to a depth of 30 cm at the tree row and at the middle of the alley at two sites: a 21-year-old pecan (Carya illinoinensis)/bluegrass (Poa trivials) intercrop (Pecan site) and a 12-year-old silver maple (Acer saccharinum)/soybean (Glycine max)–maize (Zea mays) rotation (Maple site). Sampling was done in fall 2001 and summer 2002. βGlucosidase activities, Biolog patterns expressed as average well color (AWC), substrate richness, and Shannon diversity index, and total Kjeldahl nitrogen (TKN) were significantly higher (P|t| Maple tree Maple mid P>|t| Summer 2002 Pecan tree Pecan mid P>|t| Maple tree Maple mid P>|t|
Soil organic carbon (mg kg−1)
Total Kjeldahl nitrogen (mg kg−1)
Fluorescein DA (mg g−1)
10 cm
20 cm
30 cm
10 cm
20 cm
30 cm
10 cm
20 cm
30 cm
24.6 21.1 NS 18.5 21.2 NS
18.1 18.8 NS 18.6 17.1 NS
18.0 18.0 NS 15.4 11.3 *
2.09 1.80 * 2.10 2.41 NS
1.21 1.28 NS 1.86 1.63 NS
1.07 1.10 NS 1.67 1.43 *
7.1 6.2 * 4.7 6.9 ***
5.1 5.6 NS 3.6 3.5 NS
5.2 6.1 NS 3.1 3.2 NS
26.8 25.8 NS 25.0 24.0 NS
17.8 16.9 NS 19.6 15.4 NS
16.0 15.7 NS 12.2 11.6 NS
2.32 2.09 NS 2.41 2.36 NS
1.55 1.47 NS 1.94 1.59 NS
1.34 1.34 NS 1.34 1.27 NS
5.5 5.0 NS 4.7 4.8 NS
4.9 5.4 NS 4.9 4.4 NS
4.5 6.0 ** 4.1 4.6 NS
Fluorescein DA fluorescein diacetate, NS not significant a Tree and mid represent tree row and middle of alley, respectively
133 Table 3 Correlation coefficients (r) among soil organic carbon and nitrogen, soil enzyme activities, and Shannon diversity index for surface soil (0–10 cm) in two alley cropping systems for fall 2001 Site soil property
Pecan
Maple
SOC β-Glucosidase Fluorescein DA Shannon index 48 hb Shannon index 60 h Shannon index 72 h Shannon index 84 h
SOC Soil organic carbon, TKN total Kjeldahl nitrogen, Fluorescein DA fluorescein diacetate a Soybean yields b Shannon index at 48, 60, 72 and 84 h of incubation *, **, ***Significance at P
