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首页> 外文期刊>Plant and Soil >Effects of CO2 and N fertilization on decomposition and N immobilizationin ponderosa pine litter
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Effects of CO2 and N fertilization on decomposition and N immobilizationin ponderosa pine litter

机译：CO2和N施肥对黄松凋落物分解和固氮的影响。

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摘要

Naturally senesced needles from ponderosa pine (Pinus ponderosa Dougl.), grown from seed in open-top chambers under three levels of CO2 (350, 525 and 700 mu l l(-1)) and three levels of N fertilization (0, 10 and 20 g N m(-2) yr(-1)), were used in a field litterbag decomposition study and in a laboratory study on potential microbial and nonmicrobial N immobilization. The litterbag studies revealed no statistically significant effects of either CO2 or N treatment on mass loss, N concentration, or N content over a 26-month period. The laboratory study of potential N-15 immobilization revealed no statistically significant effects of CO2 or N treatment on either total or microbial immobilization. Elevated (CO2) did have a significant negative effect on nonmicrobial immobilization, however. Natural abundance of N-15 was significantly greater with elevated (CO2) in both live and naturally senesced needles under all N treatments. This pattern combined with N-15 natural abundance in soils suggests that saplings grown under elevated (CO2) were either taking up more N from surface horizons or from a more recalcitrant soil N pool in either horizon.
机译：源自美国黄松（Pinus积木）的自然衰老的针叶，由种子在开放式密闭室中以三种二氧化碳水平（350、525和700亩ll（-1））和三种氮肥水平（0、10和10）种植而成。 20 g N m（-2）yr（-1））用于野外垃圾袋分解研究和潜在微生物和非微生物固氮作用的实验室研究。垃圾袋研究表明，在26个月内，CO2或N处理对质量损失，N浓度或N含量均无统计学意义的影响。潜在的N-15固定化的实验室研究表明，CO2或N处理对全部或微生物固定均无统计学意义的影响。但是，升高（CO2）确实对非微生物固定化有明显的负面影响。在所有N处理下，活针和自然衰老的针中N-15的自然丰度都显着增加（CO2）。这种模式与土壤中N-15的自然丰度相结合，表明在高浓度（CO2）下生长的树苗要么从地表水平吸收更多的N，要么从任一水平吸收更顽固的土壤N。

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