Abstract:[Background] Fire is recognized as a natural disturbance phenomenon that could significantly affect soil physical, chemical, mineralogical, and biological characteristics. The objective of this study is to evaluate the short-term effects of moderate fire disturbance on soil physical and chemical characteristics of woodlands and grasslands under different soil depths in Juci Mountain, Henan Province. [Methods] Soil samples from grasslands and woodlands at 0-5 and 5-10 cm soil depths of burned and unburned soil were collected by small circular knife, relative indices indicating soil infiltration and soil water storage capacity were determined via traditional methods such as the method of double-ring permeation. The short-term effects of moderate fire disturbance on soil infiltration and soil water storage capacity of woodlands and grasslands under different soil depths were studied by t test using t test function in R software. [Results] Results showed that moderate fire disturbance had a great influence on soil infiltration and water storage capacity. Compared to unburned soil, burned soil of both woodlands and grasslands exhibited a significant decrease in soil bulk density, soil water content and soil non-capillary porosity at soil top 5 cm layers (P<0.05), but no significant changes were observed of above soil properties between burned and unburned soil at 5-10 cm soil depth (P>0.05). A significant decrease in organic carbon and total nitrogen of burned soil and a significant increase in pH, total P and total K of burned soil than that of unburned soil of both grasslands and woodlands at 0-5 cm layer were noted (P<0.05), the similar discipline was found at 5-10 cm soil depth of grasslands. No significant changes of soil chemical characteristics were observed between burned and unburned soil of woodlands. Results showed that soil initial infiltration rate, stable infiltration rate and average soil infiltration rate at soil 0-5 cm soil depths of both grasslands and woodlands increased significantly after moderate fire disturbance (P<0.05), but no significant changes were observed at 5-10 cm soil depth (P>0.05). Soil maximal water storage capacity and soil non-capillary water storage capacity significantly decreased from 289.984 t/hm2 and 390.971 t/hm2 of unburned soil to 258.072 t/hm2 and 342.386 t/hm2 of burned soil (P<0.05), respectively, at 0-5 cm soil depth of grasslands and woodlands. [Conclusions] This study provides better understanding the influence of fire disturbance on the soil infiltration and water storage capacity, and suggests that a burned area is expected to have a faster infiltration rate and a lower water storage capacity than an unburned area especially in top 5 cm soil layer. More works should be done to improve the soil and water storage capacity in burned zone in Juci Mountain area.
闫东锋, 吴桂藏, 郭丹丹, 张振, 杨喜田. 中度火干扰对林草地土壤理化特性的短期影响[J]. 中国水土保持科学, 2017, 15(4): 96-103.
YAN Dongfeng, WU Guizang, GUO Dandan, ZHANG Zhen, YANG Xitian. Short-term effects of moderate fire disturbance on soil physical and chemical characteristics of woodlands and grasslands. SSWC, 2017, 15(4): 96-103.
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