Effect of Sample Treatments on Estimation of in situ Soil Available Nitrogen of the Fushan Hardwood Forest

土壤樣本處理對於福山闊葉林土壤現地有效氮估算的影響

洪富文(Fu-Wen Horng) ； 黃仁欽(Ren-Chin Huang)

《台灣林業科學》 14卷3期 (1999/09) Pp. 331-337

https://doi.org/10.7075/TJFS.199909.0331

摘要

在一個暖月（7月）與冷月（3月）採取福山闊葉林的表層士壤，測定現存土壤有效態氮。三種方法分別為1N KCl溶液在現場抽出（處理1），或在現場浸泡後回試驗室抽出（處理2），或留存於室溫回試驗室後抽出（處理3）。抽出液則測定所含NO3(上標 -)-N，NH4(上標 +)-N，以及全無機氮的含量。結果顯示處理2比處理3的值接近處理1的值：暖月的值比冷月的值偏離處理1更大。因此，現場抽出是估算現地土壤有效態氮最好的方怯。

關鍵字

土壤有效氮 ； 土壤抽出液 ； 土壤處理

並列摘要

Three treatments were tested on a warm (July) and a cold (March) sampling dates for the determination of in situ inorganic nitrogen of surface soil in the Fushan hardwood forest. The commonly used KCI solution was applied as the extraction solution on 3 separate occasions before the determination. According to the results, immediate extraction of soil samples gives the best estimation of NO3(superscript -)-N, NH4(superscript +)-N, and total inorganic N concentrations in soil. Keeping soil samples in the extraction solution and quickly sending them back to the laboratory can produce values close to those of field extraction. This is better than those staying overnight, then being transported, and extracted in the laboratory. Deviations from the estimation by in situ extraction are more serious in the warm than in the cold season. Therefore, immediate field extraction is recommended for determination of in situ inorganic nitrogen.

並列關鍵字

soil available nitrogen ； soil extract ； soil treatment