[Interannual variation of soil organic nitrogen fractions and its response to straw returning.].

Elucidating the interannual variation of soil organic nitrogen fractions and its response to straw returning is of great significance for rational regulation of soil organic nitrogen pool and sustainable soil utilization. We conducted a field microcosm experiment with typic hapludoll soil at the National Field Observation and Research Station of Shenyang Agroecosystems. Three treatments were set, including nitrogen fertilizer addition (200 kg N·hm, the same in other treatments), nitrogen fertilizer addition with 50% straw return, and nitrogen fertilizer addition with 100% straw return.

[Comparison of Enrichment and Transport of Cadmium in the Fruit of High and Low Enrichment Pepper Varieties and Its Distribution in Subcells].

Peppers are a high Cd-enriched vegetable. On the basis of a preliminary screening experiment of 91 pepper varieties and soil culture experiments during the entire growth period of 26 varieties, a high Cd variety (X15), medium Cd variety (X39), and two low varieties (X45 and X55) were selected to study the effect of different cadmium levels (0, 5, and 10 mg·kg Cd) on enrichment, transport, and accumulation as well as its subcellular distribution and chemical form. Based on the results, 5 mg·kg and 10 mg·kg of Cd inhibited shoot dry weights of four pepper varieties but increased the root dry weights of X15, X45, and X55 varieties.