Losses of SOC

Question 1

Lal 2008 (loss)

Answer 1

most soils in sub-Saharan Africa and S. Asia ~ 0.1% SOC (UK ~2%)

Question 2

Wang et al 2022 (loss)

Answer 2

warming results in higher SOC losses in top vs sub-soil

Question 3

Borelli et al 2020 (loss)

Answer 3

2070 = 50% more soil erosion from c.c. and land use change

Question 4

Yang et al 2003 (loss)

Answer 4

erosion is a natural process but humans are acclerating it

Question 5

Yang et al 2003 (loss)

Answer 5

nearly 60% of erosion is estimated to be anthropologically induced

Question 6

Yang et al 2003 (loss)

Answer 6

erosion = preferential removal of SOM and clay, resulting in less nutrients and release of CO2

Question 7

Graves et al 2015 (loss)

Answer 7

loss of SOC costs England and Wales ~ £560 million yr-1, 47% of soil degradation cost

Question 8

L3 (loss)

Answer 8

66% UK is CT, 8% is ZT

Question 9

L3 (loss)

Answer 9

intensive cultivation at Leeds Uni Farm (24 years of continous cropping) = 66% loss of macroaggregates, 33% less water retention, depleted SOC and earthworms