福山闊葉林木質殘體累積量及其養分含量

Biomass and Nutrient Content of Woody Debris in the Fushan Subtropical Broadleaf Forest of Northeastern Taiwan

林國銓(Kuo-Chuan Lin) ； 杜清澤(Chin-Tzer Duh) ； 馬復京(Fu-Ching Ma) ； 王相華(Hsiang-Hau Wang)

《台灣林業科學》 18卷3期 (2003/09) Pp. 235-244

https://doi.org/10.7075/TJFS.200309.0235

摘要

木質殘體爲倒伏或站立的木材。於台灣東北部福山亞熱帶天然闊葉林內，選擇山坡和溪谷兩生育地的林分，調查木質殘體累積量及養分貯存量。結果顯示山坡林分因密度較高，喬木生物量較大，其木質殘體量(36.1Mgha^(-1))遠高於溪谷林分者(8.5Mgha^(-1))。兩林分的量與溫帶林者比較屬於低量，但與熱帶雨林者相近可較低。山坡林分以立枯木爲主，佔大型木質殘體總量的79%，溪谷林分則以倒柘爲主，佔58%。木質殘體的累積量佔喬木地上部生物量的百分比，山坡林分爲17%，溪谷林分分別爲C17,900和4,500 kgha^(-1), N 274kgha^(-1), P8和3kgha^(-1)，K10和3kgha^(-1), Ca 134kgha^(-1), Mg27和4 kgha^(-1)。除K以外，其餘養分都是養分循環中不可忽略的組成部分。

關鍵字

木質殘體 ； 亞熱帶闊葉林 ； 山坡 ； 溪谷 ； 立枯木

並列摘要

Woody debris includes pieces of standing or fallen wood. Its biomass and nutrient storage were estimated under 2 topographic conditions (hillside and valley) in the Fushan subtropical broadleaf forest in northeastern Taiwan. Since the hills ide forests contained higher tree density and aboveground tree biomass than did the valley forests, the woody debris biomass on the hillsides (36.1 Mg ha^(-1)) was much higher than that in the valleys (8.5Mg ha^(-1)). And both amounts were lower than those reported for most temperate forests, but similar to or lower than those for tropical forests. Most coarse woody debris of the hillsides was in the snag category (about 79% of the total), while the primary category in the valleys was logs (about 58% of the total). The average amounts of woody debris were about 17% and 7% of the total aboveground tree biomass on hillsides and in valleys, respectively, which indicates that woody debris represents a significant amount of biomass in these forest ecosystems. The total nutrient pools of woody debris on hillsides and in valleys were 17,900 and 4,500kg Cha^(-1), 274 and 77kg N ha^(-1), 8 and 3 kg P ha^(-1), 10 and 3kg K ha^(-1), 134 and 37kg Ca ha^(-1), and 27 and 4kg Mg ha^(-1), respectively, The storage of all nutrients, except for K, in woody debris is an important component of the nutrient cycles of this forest ecosystem.

並列關鍵字

woody debris ； subtropical broad leaf forest ； hillside ； valley ； snag