Dissolved Organic Matter Content Characteristics of Foliar Litter in Subtropical Under Simulated Leaching Conditions
The rich rainfall in subtropical region can lead to a large amount loss of dissolved organic matte(DOM)from foliar litter during the leaching processes,which could be an important source of active organic matter in forest soil.However,the functional traits of deciduous leaves might play essen-tial roles in regulating the dissolution characteristics of DOM,but far less information have been ad-dressed.Therefore,foliar litter of eight typical tree species were selected with obvious functional traits in subtropical forests.This study analyzed the dissolution amount of soluble organic matter and their stoichiometric characteristics(including carbon,nitrogen and phosphorus)of litter using the controlled leaching experiment.The results showed that litter of Elaeocarpus decipiens compared with other species displayed more dissolution of carbon,nitrogen and phosphorus and the mass loss after leaching,due to the higher initial DOM content and the high water-holding capacity.Moreover,foliar litter traits exhibited significant effects on the dissolution rates of dissolved organic carbon,nitrogen and phosphorus,although the dissolution rates of phosphorus were significantly higher than that of carbon and nitrogen.Correlation analysis indicated that the dissolution rate of carbon was mainly affected by the initial dis-solved organic carbon content and nitrogen and the maximum water-holding capacity,while the leaf ar-ea and the initial dissolved organic phosphorus content were the most dominant factors affecting the dis-solution rates of phosphorus.In addition,foliar litter traits also significantly affected the DOC/DOP,DON/DOP and DOC/DON.These results suggest that the material migration processes of foliar litter in subtropical forests is closely related to the water-holding capacity,which can provide a scientific basis for the optimization of regional forest structure and sustainable management.
NETL
NSTL
万方数据
