[Effects of Biochar Amendment on NO Emission and Its Functional Genes in Pepper Growing Soil in Tropical Areas].

Biochar application may mitigate NO emissions and increase crop yield, yet little is known about microbial dynamics variation. To investigate the potential of increasing yield and reducing emissions of biochar in tropical areas and the dynamic mechanism of related microorganisms, a pot experiment was conducted to investigate the biochar application on pepper yield, NO emissions, and dynamic variation of related microorganisms. Three treatments were applied:2% biochar amendment (B), conventional fertilization (CON), and no nitrogen (CK).

Global soil nitrogen cycle pattern and nitrogen enrichment effects: Tropical versus subtropical forests.

Tropical and subtropical forest biomes are a main hotspot for the global nitrogen (N) cycle. Yet, our understanding of global soil N cycle patterns and drivers and their response to N deposition in these biomes remains elusive. By a meta-analysis of 2426-single and 161-paired observations from 89 published  N pool dilution and tracing studies, we found that gross N mineralization (GNM), immobilization of ammonium ( ) and nitrate ( ), and dissimilatory nitrate reduction to ammonium (DNRA) were significantly higher in tropical forests than in subtropical forests.

[Contribution of nutrient uptake and utilization on yield advantage in maize and potato intercropping under different nitrogen application rates].

Intercropping of maize and potato, as an important intercropping planting pattern, has a prominent advantage of resource utilization and yield. However, contribution of nutrient uptake and utilization to crop yield advantage and its response to N application rates remain unclear. Through a 2-year plot experiment, including maize monoculture, potato monoculture and maize intercropping with potato at 4 N-fertilized levels of N(0 kg·hm), N(125 kg·hm), N(250 kg·hm) and N(375 kg·hm), nutritional contribution of yield advantage of intercropping was studied.