在自然條件下,，熱帶濕潤森林很少能發(fā)生火災，不大可能具有適應(yīng)火災的能力,。因此可以假設(shè),，火災對這些樹種的影響是相同的，樹木多度的變化僅僅與火災的燃燒方式有關(guān),。換句話說,，如果各個樹種對相同的火災具有不同的反應(yīng)，那么這些樹種的樹木多度的變化應(yīng)該是與其生境的偏好和形態(tài)相關(guān)的,。
中國科學院西雙版納熱帶植物園Johan Slik博士等人通過調(diào)查婆羅洲地區(qū)以及與該地區(qū)鄰接火災地區(qū)老齡樹木,，結(jié)合樹木形態(tài)數(shù)據(jù)和其對生境的偏好，發(fā)現(xiàn)在火災中,，多度會降低的樹種具有如下特征：樹皮薄,，種子休眠期有限，生長在山坡或者山脊,；而多度升高則與喜好高光環(huán)境,，樹木低矮，輕質(zhì)木材,，葉子大,，種子小和較長的種子休眠時間等因素相關(guān)聯(lián)。被調(diào)查物種的多度變化與其形態(tài)特征和生境偏好都有顯著相關(guān)性,。這一結(jié)論雖然可以很好的解釋被調(diào)查物種,，但是不太具有普適性（R2 = 0.09）。這也就說明,，大多數(shù)樹木的死亡率是隨機的,，熱帶濕潤森林對火災的抵抗力很弱。隨著火災頻率在濕潤森林的升高,，熱帶濕潤森林的物種組成很可能最終被改變,，甚至導致物種的滅絕。（生 物 谷Bioon.com）
生 物 谷推薦英文摘要
Oecologia doi:10.1007/s00442-010-1764-4
Fire as a selective force in a Bornean tropical everwet forest
J. W. Ferry Slik · Floris C. Breman · Caroline Bernard ·Marloes van Beek · Charles H. Cannon ·Karl A. O. Eichhorn · Kade Sidiyasa
Abstract Tree species rarely exposed to burning, like in everwet tropical forests, are unlikely to be Wre adapted. Therefore, one could hypothesize that these species are aVected equally by burning and that tree abundance changes are linked solely to Wre behavior. Alternatively, if species do react diVerentially to burning, abundance changes should be linked to tree habitat preference and morphology. Using tree inventories from old-growth and adjacent burned Bornean forest in combination with a database on tree morphology and habitat preference, we test these alternative hypotheses by (1) determining whether species speciWc abundance changes after Wre diVer signiWcantly from equal change, and (2) whether observed abundance changes are linked to species morphology and habitat preference. We found that of 196 species tested, 125 species showed an abundance change signiWcantly diVerent from that expected under our null model of equal change. These abundance changes were signiWcantly linked to both tree morphology and habitat preference. Abundance declines were associated with slope or ridge preference, thin barks, and limited seed dormancy. Abundance increases were associated with high light preference, small adult stature, light wood, large leaves, small seeds and long seed dormancy. While species habitat preference and morphology explained observed abundance increases well, abundance declines were only weakly associated with them (R2 ?0.09). This suggests that most tree mortality was random and everwet tropical
tree species are poorly Wre adapted. As Wre frequencies are increasing in the everwet tropics, this might eventually result in permanently altered species compositions and even species extinctions.
