Field Notes

<--2003-11-10 09:00:00 | 2003-11-27 09:00:00-->

Tonzi: 2003-11-12 09:00:00 (DOY 316)
Author: Jianwu Tang
Others:

Summary: Soil respiration, soil cores from C, N, BD, Leaf litter samples

Trip note On Nov. 12, 2003
Who: Jianwu Tang
Weather: clear

A couple of days after raining. Soil is getting wet. Tree leaves are about half green and half brown. I saw the grass is germinating.

I measured soil CO2 efflux along the transect and checked and downloaded the soil CO2 profile measurements. CO2 efflux averaged 2 mmol m^-2 s^-1 under trees, while 5 mmol m^-2 s^-1in the open areas, much more than the those before rain.

I took soils cores for measuring C, N and bulk density, along the transect. #21, and #6: 2cm and 10cm soil cores. #22-#26. 10cm cores.

Our leaf screens have collected a large amount of leaves. I took back 2 bags of leaves from the big tree. It seems our methods are more accurate compared with the small leaf basket (which underestimates LAI).

Soil moisture probe reading:

Tonzi	7931AFE	402165	574B4B	402FF3	57632
11/12/2003	canopy	Canopy	open	drip line	open
D316	tower	understory	solar panel	sap flow	resp trans
0-15cm	15.30	15.10	28.65	13.35	19.00
15-30cm	12.25	25.10	26.55	23.50	25.25
30-45cm	15.80	4.10	11.25	10.85	8.55
45-60cm	11.05	5.15	9.30	9.15	8.40
Tang
	7A432E	7A3C6E	7A3B40	7A4AAA

0-15cm	17.30	16.20	15.10	8.65
15-30cm	15.05	18.20	16.25	6.75
30-45cm	13.95	11.55	16.25	15.70
45-60cm	9.15	6.15	14.10	7.10