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頁籤選單縮合
題名 | Effects of Thinning Treatments on Nutrient Release from Decomposing Needle Litter of Sugi (Cryptomeria japonica D. Don) in Northeastern Taiwan=臺灣東北部不同疏伐強度下柳杉針葉凋落物分解之養分釋出變化 |
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作者 | 蔡呈奇; 張瑀芳; 許佳雯; | 書刊名 | 臺灣林業科學 |
卷期 | 26:2 2011.06[民100.06] |
頁次 | 頁163-177 |
分類號 | 436.12 |
關鍵詞 | 柳杉; 森林疏伐; 養分釋放; 養分回歸; 凋落物分解; Sugi; Cryptomeria japonica D. Don; Forest thinning; Nutrient release; Nutrient return; Litter decomposition; |
語文 | 英文(English) |
中文摘要 | 本研究主要的目的在於探討台灣東北部50年生之柳杉(Cryptomeria japonica D. Don)人工林經疏伐後,兩年的監測期間柳杉針葉凋落物分解後養分的釋出變化。研究區疏伐的強度有三種,包括未疏伐(T0)、低度疏伐(T28)與中低度疏伐(T36)。本研究利用分解袋法來瞭解柳杉針葉凋落物的分解情形。兩年的凋落物分解試驗研究結果發現:本研究當前的疏伐強度對於柳杉針葉凋落物的養分釋放與養分回歸,有明顯的影響。凋落物分解後,碳的釋放速率最快;除了碳之外,本研究可將凋落物分解的養分動態變化,依據分解試驗期間養分損失量的相關性分析、養分重量留存量與養分含量的變化,歸類為三種類型:(1)氮與磷、(2)鈣與鎂、以及(3)鉀。另外,三種疏伐強度下養分的總體相對移動性的順序大致為:碳>(磷、鉀)>鈣>鎂>氮,本研究中不同疏伐強度的處理只有改變鉀與磷的相對移動性。另外,養分的年回歸量在T0與T28疏伐處理間沒有顯著差異,T36疏伐處理有顯著較低的養分回歸量,推測此結果可能因為在T36疏伐處理區有明顯較低的柳杉針葉凋落物的收集量。隨著疏伐強度的提高,凋落物分解後釋出的碳與其它養分的回歸量均有減少的趨勢。在本研究所有三種疏伐強度下,柳杉針葉凋落物中的生物元素回歸到土壤中的數量多寡有以下的順序:碳>鈣>氮>鉀>磷>鎂。本研究疏伐的強度可能不夠高,因此無法導致針葉凋落物分解、養分的釋放與養分的有效性等有顯著的改變。本研究建議在未來的研究中,能針對溫帶與潮濕環境下,進行較高的疏伐強度處理下的養分分解長期變動研究。 |
英文摘要 | Nutrient release processes associated with needle litter decomposition were monitored for 2 yr after thinning in a 50-yr-old Sugi (Cryptomeria japonica D. Don) plantation in northeastern Taiwan. Three thinning intensities [unthinned (T0), low (T28), and moderately low (T36)] were applied. Litterbags were used to measure the Sugi needle litter decomposition. Results of decomposition for 2 yr illustrated that the current thinning intensities in this study gave clear effects on nutrient release and return of Sugi needle litter. C release from the litter was the fastest. In addition to C, this study categorized nutrient dynamics of the decomposition litter into 3 types based on the quantity correlation of nutrient loss and changes in the weight remaining and concentration of nutrients: (1) N and P, (2) Ca and Mg, and (3) K. The overall relative mobilities of the nutrients examined after 2 yr were as follows: C > (P, K) > Ca > Mg > N. In this study, only the relative mobility of K and P changed with the different thinning intensities. The annual return of all nutrients showed no significant difference between treatments T0 and T28. Significantly lower nutrient return rates existed with treatment T36, and these may have contributed to the significantly lower input of Sugi leaf litterfall. The quantities of C and other nutrients returned through litterfall decreased with an increasing thinning intensity. Amounts of bioelements of Sugi needle litter that were returned to the soil were as follows: C > Ca > N > K > P > Mg for the 3 thinning intensities in this study. It is possible that the current thinning level was not high enough to produce very significant changes in needle litter decomposition, nutrient release, or nutrient availability. For future studies, we suggested that both higher thinning intensity treatment and long-term decomposition studies of changes in temperate and moist environmental conditions are necessary. |
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