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題名 | Variations of [fee4]N Natural Abundance in Leaves and Soils of Two Natural Lauro-Fagaceae Forests in Taiwan=臺灣兩個天然楠櫟林葉片與土壤[fee4]N天然豐富度之變異 |
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作者 | 王巧萍; 林國銓; | 書刊名 | 臺灣林業科學 |
卷期 | 18:2 2003.06[民92.06] |
頁次 | 頁153-157 |
分類號 | 436.193 |
關鍵詞 | 穩定同位素; [fee4]N天然豐富度; 亞熱帶土壤; 楠櫟林; Stable isotope; δ[fee4]N; Subtropical soils; Lauro-Fagaceae forest; |
語文 | 英文(English) |
中文摘要 | 本研究測定福山與六龜兩個天然楠櫟林葉片與土壤15N天然豐富度之變異,以瞭解亞熱帶森林之氮循環與氮利用效率之趨勢。福山土壤之氮濃度(0.67?.11%)雖明顯低於六龜(1.19?.05%),但兩試驗地之葉片平均氮濃度(福山: 1.91?.18%、六龜:1.88?.32%)則無顯著差異。福山之葉片與土壤15N天然豐富度分別為-1.9?.3及1.6?.5�,均明顯高於六龜之-4.4?.0與0.6?.1�,這可能是由於福山之高降雨量,使得在礦化過程中因同位素分離作用而較輕的硝酸根可大量淋溶流失,而留下較重的15N所致。本研究中的兩亞熱帶天然楠櫟林葉片與土壤之平均15N天然豐富度之測值,均明顯較熱帶森林為低,而與溫帶林者相似。 |
英文摘要 | Foliar and soil δ15N values of 2 subtroical Lauro-Fagaceae forests of Fushan and Liukuei, Taiwan, were investigated to understand N cycling and N use efficiency trends. Although the soils from Fushan (0.67?.11%) contained less nitrogen than those from Liukuei (1.19?.05%), there was no significant difference between the average nitrogen contents in foliage (Fushan 1.91?.18%, Liukuei 1.88?.32%). The average foliar and soil δ15N values of Fushan (-1.9?.3 and 1.6?.5? were both significantly higher than those of Liukuei (-4.4?.0 and 0.6?.1 ?. This may be due to the higher precipitation at Fushan which could lead to more N losses through leaching of nitrate derived from nitrification and leave the heavier 15N remaining in the system. The δ15N values of subtropical foliage and soils measured in this study were significantly lower than those reported from tropical forests; however, they did not significantly differ from those of temperate forests. |
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