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