[CH4 absorption and its affecting factors in a wheat field with conservation tillage].
In order to understand the relationships between CH4 fluxes and its affecting factors in a wheat field with conservation tillage, the CH4 fluxes in two wheat fields, one with conservation tillage and the another with conventional tillage, were measured in situ by static chamber-GC method, with soil temperature and soil moisture and inorganic nitrogen contents determined at the same time. The results showed that these two fields had an obvious and similar seasonal variation pattern of CH4 fluxes, but the average and seasonal CH4 absorption fluxes differed significantly. In the growth period of wheat, the fields were the sink of CH4, and the CH4 absorption fluxes was in the order of conventional tillage with no straw returning (CN) > conventional tillage with straw returning (CS) > subsoiling with straw returning (PS) > harrowing with straw returning (HS) > rotary tillage with straw returning (RS) > no tillage with straw covered (NS). Comparing with conventional tillage, conservation tillage reduced the CH4 absorption fluxes. In conservation tillage, the CH4 absorption fluxes was positively correlated with soil temperature but negatively correlated with soil moisture content; while in conventional tillage, the CH4 absorption fluxes had no significant correlations with the two factors. In all treatments, there was a significant negative correlation between CH4 absorption fluxes and soil NH4+ -N content.
Zhao
Jian-bo
JB
State Key Laboratory of Crop Biology, College of Agronomy, Shandong Agricultural University, Taián 271018, Shandong, China. whjianbo@163.com
Li
Zeng-jia
ZJ
Chi
Shu-jun
SJ
Ning
Tang-yuan
TY
Gu
Shu-bo
SB
Qiu
Li-qun
LQ
Wang
Yun
Y
Jiang
Xiao-dong
XD
D000042:Absorption; D000383:Agriculture / Q000379:methods*; D000393:Air Pollutants / Q000032:analysis / Q000378:metabolism*; D017753:Ecosystem; D004784:Environmental Monitoring; D008697:Methane / Q000032:analysis / Q000378:metabolism*; D012987:Soil / Q000032:analysis*; D014908:Triticum / Q000254:growth & development*
D000393:Air Pollutants; D012987:Soil; D008697:Methane