Analysis and Evaluation of Litter and Soil Water Conservation Capacity of Different Stand Types
This study scrutinizes the hydrological benefits conferred by forest litter and soil across various stand types in Yunyong Forest Farm,Foshan City,Guangdong Province,through employing field surveys and laboratory water retention tests.Specifically,the research subjects encompasses Pinus massoniana pure forest,Pinus caribaea pure forest,Cunninghamia lanceolata pure forest,and a mixed forest of Chinese fir.The findings reveal that litter biomass across the four stand types ranged from 4.42 to 6.72 t∙hm-2,with the mixed Chinese fir forest exhibiting the highest amount and the Masson pine forest having the lowest values.Notably,the litter's semi-decomposed layer harbored a greater mass than its undecomposed counterpart in each forest type.The mixed Chinese fir forest,in comparison to its monoculture counterpart,had an increase of 4.83%and 13.57%in maximum water-holding capacity and effective retention capacity of litter,respectively.Among the three coniferous forests,the Chinese fir forest had the highest maximum water-holding capacity and effective water storage capacity(7.12 t∙hm-2 and 6.00 t∙hm-2,respectively).These capacities were significantly positively correlated with litter thickness and biomass(p<0.05).Moreover,the saturated water-holding capacity,capillary water-holding capacity,and non-capillary water-holding capacity of soil in the Caribbean pine forest were 1.18-1.44 times higher than the other three forest types.The saturated water-holding capacity,capillary water-holding capacity,and non-capillary water-holding capacity of soil in the mixed forest increased by 10.79,3.94,and 6.84 t∙hm-2 compared to the Chinese fir forest.The saturated water-holding capacity and capillary water-holding capacity were significantly correlated with total soil porosity,capillary porosity,bulk density,and organic carbon content(p<0.05),while non-capillary water-holding capacity was mainly related to non-capillary porosity and bulk density of soil(p<0.05).Redundancy analysis elucidates that soil porosity and mass fraction of organic carbon are pivotal in modulating soil water retention across differing stand types,with litter thickness and mass fraction of organic carbon being the salient factors determining the disparities in litter water retention capabilities.The comprehensive water conservation capacity ranking of the four forest types was as follows:mixed Chinese fir forest>Caribbean pine forest>Chinese fir forest>Masson pine forest.Consequently,coniferous mixed forests emerge as superior hydrological assets for the region,with Caribbean pine forest being the most effective among the monocultures.It is recommended that Caribbean pine forest be considered a prime candidate in future afforestation projects for water conservation.
different stand typesconiferous pure forestmixed forestlittersoilwater conservation capacity
万方数据
维普
