頁籤選單縮合
題名 | 關刀溪集水區土壤氮素礦化與生物固氮作用=Mineralization and Dinitrogen Fixation in Guandaushi Watershed Soils |
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作者 | 譚鎮中; 黃世傑; 李振州; Tan, Chen-chung; Huang, Shih-chieh; Lee, Chen-chou; |
期刊 | 土壤與環境 |
出版日期 | 19981200 |
卷期 | 1:4 1998.12[民87.12] |
頁次 | 頁371-379 |
分類號 | 432.225 |
語文 | chi |
關鍵詞 | 森林生態系; 養分循環; 礦化作用; 硝化作用; 固氮作用; Forest ecosystem; Nutrient cycling; Mineralization; Nitrification; N[feaf]fixation; |
中文摘要 | 本研究主要目的在探討惠蓀林場關刀溪集水區土壤氮素礦化作用,硝化作用與生物固氮作用。季節的變化對土壤中有效性氮有相當的影響;大部分土壤的無機氮含量在雨季開始的三月時高於乾季之十月與十二月。土壤經火燒與颱風吹倒林木的干擾後,土壤無機態氮量也提高。所有採樣點土壤的平均淨礦化作用速率及平均淨硝化作用速率範圍分別約為20∼150及0∼50 μg N/g/30 days,闊葉林土壤有較高的淨礦化作用速率,火燒過後土壤比未燒過土壤的淨礦化作用與硝化作用速率較低。倒木則會提高淨礦化作用與硝化作用速率。杉木林與闊葉林區土壤游離性生物固氮活性較低,以石灰調高pH值後,土壤生物固氮活性均提高, 因此,pH 值可能為生物固氮活性的重要限制因子之一。經火燒過後土壤之生物固氮活性大於對照區土壤。 |
英文摘要 | The primary purpose of this study was to investigate the mineralization, nitrification and biological dinitrogen fixation rates in Guandaushi watershed soils. Inorganic nitrogen contents in most of the soils sampled were higher in March than that in dry season (i.e. October and December). Burnt and tree fall increased the inorganic nitrogen contents in the soils. Average net N mineralization rates and net nitrification rates of the watershed soils were 20~150 and 0~53 μg N/g/30 days, respectively. Coniferous forest soils had lower net N mineralization rates than those of hardwood forest soils. Burnt soils had lower net N mineralization and net nitrification rates than that in unburnt soils. However, the net N mineralization and net nitrification could be enhanced by tree fall. The nitrogenase activities of the watershed soils were considerable low. Liming could stimulate soil nitrogenase activities, revealed that the low pH value was one of the major limiting factors controlling the nitrogenase activity in the soil. Soil nitrogenase activities of burnt soils were higher than that of unburnt soils. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。