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Potential bias of daily soil CO2 efflux estimates due to sampling time.

Abstract：

:Soil respiration (Rs) has been usually measured during daylight hours using manual chambers. This approach assumes that measurements made during a typical time interval (e.g., 9 to 11 am) represent the mean daily value; locally, this may not always be correct and could result in systematic bias of daily and annual Rs budgets. We propose a simple method, based on the temporal stability concept, to determine the most appropriate time of the day for manual measurements to capture a representative mean daily Rs value. We introduce a correction factor to adjust for biases due to non-optimally timed sampling. This approach was tested in a semiarid shrubland using 24 hr campaigns using two treatments: trenched plots and plots with shrubs. In general, we found optimum times were at night and potential biases ranged from -29 to + 40% in relation to the 24 hr mean of Rs, especially in trenched plots. The degree of bias varied between treatments and seasons, having a greater influence during the wet season when efflux was high than during the dry season when efflux was low. This study proposes a framework for improving local Rs estimates that informs how to decrease temporal uncertainties in upscaling to the annual total.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Cueva A,Bullock SH,López-Reyes E,Vargas R

doi

10.1038/s41598-017-11849-y

subject

Has Abstract

pub_date

2017-09-20 00:00:00

pages

11925

issue

1

issn

2045-2322

pii

10.1038/s41598-017-11849-y

journal_volume

7

pub_type

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