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Effect of multipurpose tree species on soil fertility and CO2 efflux under hilly ecosystems of Northeast India

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Title Effect of multipurpose tree species on soil fertility and CO2 efflux under hilly ecosystems of Northeast India
Not Available
 
Creator T. Ramesh
K. M. Manjaiah
J. M. S. Tomar
S. V. Ngachan
 
Subject Activation energy _ MPTs _ Soil CO2 efflux _ Soil fertility _ Temperature
 
Description Not Available
A 26 years old agroforestry plantation
consisting of four multipurpose tree species (MPTs)
(Michelia oblonga Wall, Parkia roxburghii G. Don,
Alnus nepalensis D. Don, and Pinus kesiya Royle ex -
Gordon) maintained at ICAR Research Complex,
Umiam, Meghalaya, India were compared with a
control plot (without tree plantation) for soil fertility
status and CO2 efflux. The presence of trees improved
all the physico - chemical and microbial biomass
parameters studied in this experiment. Relative to
control, soils under MPTs showed significant increases
of 17 % soil organic carbon, 26 % available nitrogen
(AN), 28 % phosphorus (AP), 50 % potassium (AK),
65 % mean weight diameter (MWD) of aggregates,
21 % moisture and 34 % soil microbial biomass
carbon (MBC) while reducing the mean bulk density
(7 %). However, these parameters significantly differed
among the tree species i.e., soils under A.
nepalensis and M. oblonga had higher values of these
attributes except bulk density, than under other species.
Irrespective of treatments, the values of all these
attributes were higher in surface soils while bulk
density was highest in subsurface (60–75 cm). Cumulative
CO2 efflux under MPTs was significantly higher
(15 %) and ranged from 1.71 g 100 g - 1 (M. oblonga)
to 2.01 g 100 g - 1 (A. nepalensis) compared to control
at 150 days of incubation. In all the treatments,
increment in temperature increased the oxidation of
soil organic matter, thereby increased the cumulative
CO2 efflux from soils. Of the tree species, with
increment in temperature, A. nepalensis recorded more
CO2 efflux (2.50 g 100 g - 1) than other MPTs but the
per cent increase was more in control plot. P. kesiya
and A. nepalensis recorded highest activation energy
(59.1 and 39 kJ mol - 1, respectively). Net organic
carbon sequestered in soil was highest under A.
nepalensis (25.7 g kg - 1) followed by M. oblonga
(19.3 g kg - 1), whereas control showed the lowest
values. Amount of net carbon stored in the soil had
significant and positive correlation with MBC
(r = 0.706 * *), MWD (r = 0.636 *), and AN
(r = 0.825 * *).
Not Available
 
Date 2020-03-06T06:16:46Z
2020-03-06T06:16:46Z
2013-09-27
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/33632
 
Language English
 
Relation Not Available;
 
Publisher Not Available