[Effect of prescribed burning on grassland nitrogen gross mineralization and nitrification].
The seasonal dynamics of nitrogen gross mineralization, nitrification, and mineral nitrogen consumption rates in burned and unburned Leymus chinensis grasslands were studied with 15N pool dilution technique. The results indicated that the gross mineralization and nitrification rates in burned area were higher than those in unburned area in April and May, and lower than those in unburned area in September. NH4(+)-N consumption rates were higher than unburned area in April and May, and lower in September. NO3(-)-N consumption rates were higher than control in April and May, and lower than control in July and September. The NH4(+)-N concentrations were higher in burned area in April, May and July, and no difference in September. NO3(-)-N concentrations were no difference between burned and unburned areas in April and May, and higher in burned areas in July and September.
Li
Yuzhong
Y
Agrometeorology Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China. Leeyz@cja.org.cn
Zhu
Tingcheng
T
Li
Jiandong
J
Zhou
Daowei
D
D000641:Ammonia / Q000032:analysis; D005390:Fires; D009566:Nitrates / Q000032:analysis; D009584:Nitrogen / Q000737:chemistry*; D006109:Poaceae / Q000378:metabolism*; D012987:Soil / Q000032:analysis*; D014867:Water
D009566:Nitrates; D012987:Soil; D014867:Water; D000641:Ammonia; D009584:Nitrogen