杉木林土壤渗滤水溶解有机碳含量与迁移  

Concentrations and Fluxes of Dissolved Organic Carbon in the Soil Percolating Water of Chinese Fir Plantation

作　　者：俞元春[1] 何晟[1] Wang G.Geoff 李淑芬[1] 

机构地区：[1]南京林业大学森林资源与环境学院 [2]Department of Forestry and Natural Resources,Clemson University Clemson 29634

出　　处：《林业科学》2006年第1期122-125,共4页Scientia Silvae Sinicae

基　　金：国家自然科学基金项目(30070615)

摘　　要：Leaching of dissolved organic carbon (DOC) and the associated nutrient elements can be a significant form of loss from Chinese Fir plantations due to intensive cultural treatments. We studied the concentrations and fluxes of DOC in soil percolating water in recently planted, young and mature Chinese Fir stands in southeastern China. Soil samples were collected from 0～20, 20～40 and 40～60 cm in each stand. Soil percolating water was collected with non_suction lysimeters installed at the mid-slope in a line perpendicular to the slope at the depth of 20, 40 and 60 cm. DOC concentrations in soil percolating water ranged from 6.08 to 21.05 mg·L^-1 (mean:12.76 mg·L^-1), decreasing with increasing soil depth. The DOC concentration of the young stand remained the lowest regardless of measuring time. However, the DOC concentration of the recently planted stand was the greatest in May while the DOC concentration of the mature stand was greatest in July when compared to other plantations. DOC concentrations were highly correlated with soil organic carbon (r^2 0.608), total nitrogen (r^2 0.369) and free iron (r^2 0.598) concentrations while the amounts of DOC were closely related to the amounts of organic carbon (r^2 0.829), N (r^2 0.721) and P (r^2 0.377), suggesting the important influence of DOC on the transportation of other elements, especially nutrient elements, in the soil.Leaching of dissolved organic carbon （DOC） and the associated nutrient elements can be a significant form of loss from Chinese Fir plantations due to intensive cultural treatments. We studied the concentrations and fluxes of DOC in soil percolating water in recently planted, young and mature Chinese Fir stands in southeastern China. Soil samples were collected from 0 - 20, 20 - 40 and 40 - 60 cm in each stand. Soil percolating water was collected with non-suction lysimeters installed at the mid-slope in a line perpendicular to the slope at the depth of 20, 40 and 60 cm. DOC concentrations in soil percolating water ranged from 6.08 to 21.05 mg·L^-1 （mean：12.76 mg·L^-1）, decreasing with increasing soil depth. The DOC concentration of the young stand remained the lowest regardless of measuring time. However, the DOC concentration of the recently planted stand was the greatest in May while the DOC concentration of the mature stand was greatest in July when compared to other plantations. DOC concentrations were highly correlated with soil organic carbon （ r^2= 0.608） , total nitrogen （ r^2= 0.369） and free iron （ r^2 = 0.598） concentrations while the amounts of DOC were closely related to the amounts of organic carbon （ r^2 = 0. 829）, N （ r^2 = 0.721） and P （ r^2= 0.377）, suggesting the important influence of DOC on the transportation of other elements, especially nutrient elements, in the soil.

关 键 词：杉木人工林 森林土壤 渗滤水 溶解有机碳 土壤养分 

分 类 号：S714[农业科学—林学]