Indirect Impacts of Land Use Change on Soil Organic Carbon Change in China
Received date: 2005-12-20
Revised date: 2006-01-11
Online published: 2006-02-15
Soil organic carbon (SOC) storage and its change trend in China is important to the global carbon cycles under the background of global warming. Land use change has both direct and indirect influences on SOC storage. On the one hand, the land use change directly modifies the original ecosystem type and then makes the net primary productivity and soil carbon input change, which directly impacts SOC storage. On the other hand, land use change modifies some physical or chemical properties of soil and thus potentially impacts the value of temperature sensitivity of soil heterogeneous respiration (Q10). Under the situation of global warming, the changed Q10 will modify the feedback intensity of soil respiration and then indirectly impacts the soil organic carbon storage. In this study, a regional process-based carbon cycle model (CASA model) was used to estimate the Q10 values for the different land use types. Basing on the differences of Q10 among land use types, the indirect impacts of land use change on soil organic carbon storage was assessed. The results showed that the land use changes from grassland or forest to cropland will increase the value of Q10. Furthermore, the human activities, such as utilizing of irrigation and nitrogenous fertilizer will also increase the values of Q10. So, the land use change and human activities will potentially increase soil carbon releasing under the situation of global warming and then will indirectly impact soil organic carbon storage.
Key words： Soil respiration; Temperature sensitivity; Q10; CASA model; China.
Zhou Tao,Shi Peijun . Indirect Impacts of Land Use Change on Soil Organic Carbon Change in China[J]. Advances in Earth Science, 2006 , 21(2) : 138 -143 . DOI: 10.11867/j.issn.1001-8166.2006.02.0138
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