[Temperature sensitivity of organic C mineralization in gray forest soils after land use conversion].
A laboratory incubation test was conducted to study the organic C mineralization in gray forest soils after land use conversion and the temperature sensitivity of the mineralization. It was shown that after the conversion from wildwood land to farmland, the organic C and total N contents in 0-10 cm and 10-20 cm soil layers decreased by 68.5% and 76.8%, and 40.5% and 44.4%, and the average mineralization rate and cumulative mineralization of soil organic C in farmland were 24.4%-43.2% and 9.20%-13.7% of those in wildwood land, respectively. At lower temperature (< 25 degrees C), there was no significant difference in the temperature sensitivity of soil organic C mineralization between the two land use types; while at higher temperature ( > 25 degrees C), this temperature sensitivity in farmland soil was higher in 0-10 cm layer but significantly lower in 10-20 cm layer, compared with that in wildwood land soil.
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China. rmxu@issas.ac.cn
Ru-Min
RM
Xu
Zhong-Pei
ZP
Li
Yu-Ping
YP
Che
Chao
C
Zhang
D002244:Carbon / Q000737:chemistry*; D002681:China; D018556:Crops, Agricultural / Q000254:growth & development*; D012987:Soil / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis; D013696:Temperature; D014197:Trees / Q000254:growth & development*
D012987:Soil; D012989:Soil Pollutants; D002244:Carbon