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利用~(15)N示踪法测定红萍在水和土壤中的分解过程。所采用的三个红萍种(8个品系)中,属于羽叶萍中的Malaysia品系的生物量最高,进入水中的腐烂物质数量最大,墨西哥萍居中,细萍生长极慢。红萍混入土中时,羽叶萍的矿化过程最活跃,其次是细萍、墨西哥萍。盆钵中的水稻植株,吸收了50%插秧时混入的红萍氮。红萍放养在水面时,对水稻有效的氮还不到10%。大田试验中,混入土中的红萍对水稻有效的氮量比置于上表的要多。
Deletion process of Rhodiola rosea in water and soil was determined by ~ (15) N tracer method. Of the three Rhododendron species (8 lines) used, the Malaysia strain belonging to Pinus papyrus had the highest biomass and the largest amount of decayed substance entering the water. The Mexican duckweed and Pinilla grew very slowly. Hongping mixed soil, Yu Ping’s mineralization process is most active, followed by fine Ping, Mexico Ping. Potted rice plants in the pot, absorbed 50% when planting translucent nitrogen. When Rhododendron is stocked on the surface of the water, less than 10% of the available nitrogen is available to rice. In field trials, rhizomes mixed with soil had more effective N rates than rice in the table above.