[Effects of long-term fertilization on paddy soils organic nitrogen, microbial biomass, and microbial functional diversity].
Soil samples were collected from the plow layers at two long-term experiment sites in Xinhua and Ningxiang counties of Hunan Province, China to study the effects of long-term fertilization on organic nitrogen, microbial biomass, and microbial functional diversity of paddy soils. Long-term fertilization showed great effects on the soil N content. Compared with CK, treatments NPK plus manure or straw increased the contents of soil total acid-hydrolysable N and its fractions amino sugar N, amino acid N, and ammonium N. Treatment NPK had no significant effects on soil microbial biomass C and N, but treatments NPK plus manure increased the contents of soil microbial biomass C and N significantly. BIOLOG test showed that treatments NPK plus manure enhanced the carbon utilization efficiency of soil microbes, and improved the functional diversity of soil microbial communities, compared with CK. Long-term different fertilizer treatments resulted in the differences of carbon substrate utilization patterns of soil microbial communities.
Hao
Xiao-Hui
XH
College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China. hetty_hitt@163.com
Hu
Rong-Gui
RG
Wu
Jin-Shui
JS
Tang
Shui-Rong
SR
Luo
Xi-Qian
XQ
D001419:Bacteria / Q000145:classification / Q000254:growth & development; D044822:Biodiversity; D015169:Colony Count, Microbial; D017753:Ecosystem; D005308:Fertilizers; D009584:Nitrogen / Q000032:analysis*; D009930:Organic Chemicals / Q000032:analysis; D012275:Oryza / Q000254:growth & development*; D012987:Soil / Q000032:analysis*; D012988:Soil Microbiology
D005308:Fertilizers; D009930:Organic Chemicals; D012987:Soil; D009584:Nitrogen