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Response of soil respiration to precipitation during the dry season in two typical forest stands in the forest-grassland transition zone of the Loess Plateau |
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| Authors: | Wei-Yu Shi Ryunosuke TatenoJian-Guo Zhang Yi-Long Wang Norikazu YamanakaSheng Du |
| Institution: | a State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences, Yangling, Shaanxi 712100, China b Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China c Faculty of Agriculture, Kagoshima University, Kagoshima 890-0065, Japan d Arid Land Research Center, Tottori University, Tottori 680-0001, Japan e Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
| Abstract: | Forest ecosystems on the Loess Plateau are receiving increasing attention for their special importance in carbon fixation and conservation of soil and water in the region. Soil respiration was investigated in two typical forest stands of the forest-grassland transition zone in the region, an exotic black locust (Robinia pseudoacacia) plantation and an indigenous oak (Quercus liaotungensis) forest, in response to rain events (27.7 mm in May 2009 and 19 mm in May 2010) during the early summer dry season. In both ecosystems, precipitation significantly increased soil moisture, decreased soil temperature, and accelerated soil respiration. The peak values of soil respiration were 4.8 and 4.4 μmol CO2 m−2 s−1 in the oak plot and the black locust plot, respectively. In the dry period after rainfall, the soil moisture and respiration rate gradually decreased and the soil temperature increased. Soil respiration rate in black locust stand was consistently less than that in oak stand, being consistent with the differences in C, N contents and fine root mass on the forest floor and in soil between the two stands. However, root respiration (Rr) per unit fine root mass and microbial respiration (Rm) per unit the amount of soil organic matter were higher in black locust stand than in oak stand. Respiration by root rhizosphere in black locust stand was the dominant component resulting in total respiration changes, whereas respiration by roots and soil microbes contributed equally in oak stand. Soil respiration in the black locust plantation showed higher sensitivity to precipitation than that in the oak forest. |
| Keywords: | Exotic black locust plantation Forest-grassland transition Indigenous oak forest Loess Plateau Precipitation Semiarid region Soil respiration |
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