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火作为影响森林生态系统的一个生态因子,既可能有利于维持生态系统的平衡与稳定,也可能会破坏系统的结构和功能,甚至引起生态系统的失调或崩溃。森林碳储量是陆地生态系统碳库的重要组成部分,研究火烧对土壤有机碳和理化属性的影响,对认识自然或人为干扰下森林生态系统碳储量的变化具有重要意义。本文通过选取2007年5月南方红壤丘陵区典型人工针叶林中一次突发性火灾后形成的一块火烧迹地,划分不同火烧强度,进行土壤调查取样和室内实验分析。研究结果表明,火灾发生2个月后,高强度火烧和中强度火烧下,0～40cm的土壤剖面有机碳储量相比低强度分别降低了61.4%和39.5%;0～10cm、10～20cm和20～40cm等3个土层上,土壤有机碳储量的大小均呈现出低强度火烧>中强度火烧>高强度火烧的一致趋势。土壤理化性质方面,中、高强度火烧迹地上土壤容重相比低强度火烧有增大趋势,高强度火烧迹地土壤pH值最高。
Fire, as an ecological factor affecting forest ecosystem, may not only help to maintain the balance and stability of ecosystems, but also may damage the structure and function of the system and may even cause ecosystem disorders or collapse. Forest carbon storage is an important part of the terrestrial ecosystem carbon pool. Studying the influence of burning on soil organic carbon and physicochemical properties is of great significance for understanding the changes of carbon stock in forest ecosystems under natural or man-made disturbance. In this paper, by selecting a piece of fire burned area formed after a sudden fire in the typical artificial coniferous forest in red soil hilly region in May 2007, different fire intensity was divided into soil sampling and indoor laboratory analysis. The results showed that organic carbon storage in 0-40 cm soil profile decreased by 61.4% and 39.5%, respectively, at 0-10 cm, 10-20 cm and 2 0 months after fire, The soil organic carbon storage showed a consistent trend of low intensity fire> medium intensity fire> high intensity fire on the three soil layers of 20-40 cm. Soil physical and chemical properties, medium and high intensity of fire burned soil bulk density compared with low-intensity fire has an increasing trend, high-intensity burned soil pH highest.