Changes in soil carbon stock after deforestation and subsequent establishment of “Imperata” grassland in the Asian humid tropics
Changes in soil carbon stock after deforestation and subsequent establishment of “Imperata” grassland in the Asian humid tropics
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DOI：
10.1007/s11104-009-0175-y
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发表时间：
2010-04
期刊：
影响因子：
4.9
通讯作者：
Yusuke Yonekura;S. Ohta;Y. Kiyono;Darul Aksa;K. Morisada;Nagaharu Tanaka;M. Kanzaki
中科院分区：
文献类型：
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作者：
Yusuke Yonekura;S. Ohta;Y. Kiyono;Darul Aksa;K. Morisada;Nagaharu Tanaka;M. Kanzaki
在全球范围内，热带森林砍伐之后往往会出现易发生火灾的草原。在东南亚，毁林后的主要土地覆被是Imperata cylindricgrassland。没有关于这种土地转换后土壤碳（C）储存量变化的定量数据。我们的目的是阐明森林砍伐后土壤碳储量的变化，其次是发生和持续的I。在亚洲潮湿的热带地区的圆筒状的草地。我们比较了原始森林（n= 20）和草地（n= 14）之间的土壤碳储量与广泛的土壤质地在东加里曼丹（印尼婆罗洲）。我们还评估了1992年和2004年之间的草地土壤碳储量的时间变化，通过比较相同的土坑（n= 7）。从原始森林到草地的过渡过程中，土壤碳储量（0-100 cm深）增加了23%，在大约10年。然而，在12年的草地网站，土壤碳储量没有变化，在0-100厘米的深度，但我们观察到增加的黑度的土壤，特别是粗质地的土壤。碳储量的增加在很大程度上是由于有机质供应的草根，根茎，和烧焦的材料从野火到地下土壤和底土（5-100厘米）。12年来草地土壤C库（0-100 cm）基本保持不变，表明草地土壤C库已接近平衡状态。然而，增加的黑度的土壤表明，在土壤有机质的质量变化，更高的底土根输入和更深的蚯蚓生物扰动。
Globally, tropical deforestation is often followed by the establishment of fire-prone grassland. In Southeast Asia,Imperata cylindricagrassland is the dominant land cover after deforestation. No quantitative data are available on the changes in soil carbon (C) stock upon such land conversion. We aimed to elucidate changes in soil C stock after deforestation followed by the occurrence and persistence ofI. cylindricagrassland in the Asian humid tropics. We compared soil C stock between primary forests (n= 20) and grasslands (n= 14) with a wide range of soil textures in East Kalimantan (Indonesian Borneo). We also assessed the temporal change in soil C stock in the grassland sites between 1992 and 2004 by comparing identical soil pits (n= 7). Soil C stock (0–100 cm deep) increased by 23% following transition from primary forest to grassland during about 10 years. Over 12 years at the grassland sites, however, soil C stock did not change in the 0–100 cm depth, but we observed increased blackness of soil, especially coarse-textured soils. The increase in C stock following the transition was largely attributed to the organic matter supply by grass roots, rhizomes, and charred materials from wildfires to the subsurface soils and subsoils (5–100 cm). The unchanged soil C stock (0–100 cm) over 12 years at the grassland sites suggests that the soil C stock level there has nearly reached a new equilibrium state. However, the increased blackness of the soil suggests changes in the quality of soil organic matter by higher subsoil root input and deeper bioturbation by earthworms.