区域性森林大火的真正成因

Real genesis of regional forest fire.

森林大火真正起因于地球排气中易燃还原性气体在腐殖层的临界积聚（气体体积分数大约为5％～6％）。现场气体（H2，CO）系统测量结果证实了这一点。测量结果显示，该林区腐殖层中H2、CO质量分数分别为（10-170）×10^-6（本底值为0．5×10^-6）和（2～60）×10^-6（本底值为0．5×10^-6），二者均远高于大气本底值数十到数百倍，而且未燃区的测值显然高于1998年燃区。

The regional forest fire is actually caused by critical accumulation （up to about 5-6 vol. % ） of reductive gases from Earth degassing in forest floor, which is revealed by our field H2 and CO measurements. Results show that the given forest is characterized by very high H2 and CO contents in floor soil, which are tens to hundreds times higher than the background H2 and CO contents in atmosphere. The unfired region has higher values than the fired region （fired in 1998）.