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Carbon Input
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Scientific Question

Soil carbon (C) storage and cycling play a key role in regulating the responses of terrestrial ecosystems to global climate change. Soil organic C mainly originated from the decomposition of above- (litter decomposition) and below-ground C input (root exudate, root decomposition) from plants. Soil C pool is huge, so it is difficult to found obvious variation in natural condition. Detritus Input and Removal Treatments (DIRT) can examine soil C pool and cycling through changing soil carbon input. The relative roles of these two C input pathways in regulating different components of soil organic C pools and cycling have been conducted in various forest ecosystems (Nadelhoffer et al. 2004). However, response of soil C pool and cycling on the quality and quantity of C input are still not clear. Forest in subtropical-warm temperate transition regions, is predicted to be sensitive to climate change (Mahlstein et al., 2013). Changes in quality and quantity of C input could substantially impact soil C storage and cycling, consequently influence ecosystem and regional C cycling.

Experimental Design

The experiment has been conducted in three forest types (Pinus massoniana forest, Quercus acutissima forest and P. massoniana-Q. acutissima mixed forest) of subtropical-warm temperate transition regions in China since 2015. Twenty-four 2 × 2 m2 plots are arranged into 4 row and 6 columns in each forest type. The distance between each two plots is at least 3 m. One plot in each row is assigned to one of the six treatments: 1) Control, 2) Double litter, 3) No roots, 4) No litter, 5) No input, and 6) No roots and double litter.

                               

Members

Renhui Miao, Xueli Qiu, Guangfei Yang, Yanchun Liu, Yinzhan Liu, Shiqiang Wan

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Copyright:Laboratory of Global Change Ecology

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