Table 2 The experimental treatments and sampling intervals from the measurement of soil amino sugars and respired CO2 during the incubation period.

From: Effects of drying and wetting cycles on the transformations of extraneous inorganic N to soil microbial residues

Treatmentsa

Substrate

Drying length (days)

Wetting length (days)

Moisture

Frequency

Sampling intervals

wetting phase

drying phase

Soil respired CO2

Amino sugarsb

CW

NH4 + or NH4 + + Glucose

0

36

20%

—

0

1 hour and 4 hour after the beginning of incubation, and then every 1 day of the whole incubation

At the same sampling day for the LD

LD

NH4 + or NH4 + + Glucose

1

3

20%

15%

9

Same as above

After 1st, 2nd, 4th, 6th and 9th wetting

MD

NH4 + or NH4 + + Glucose

2

3

20%

10%

7

Same as above

After 1st, 2nd, 4th, 6th and 7th wetting

SD

NH4 + or NH4 + + Glucose

3

3

20%

5%

6

Same as above

After 1st, 2nd, 4th and 6th wetting

  1. aCW, continuous wetting treatment; LD, low drying intensity treatment; MD, medium drying intensity treatment; SD, severe drying intensity treatment. bThe soils were sampled at the end of each drying and wetting cycle (at the third day after rewetting in each drying and wetting cycle).
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