Soil Nutrient Dynamics in Age Sequence of Mized Plantations of Alder and Cypress in the Hilly Area of Central Sichuan Basin, China
Soil nutrients are essential to ecosystem processes. A field study was conducted in 2004 to study the soil nutrient dynamics in the mixed plantations of alder (Aluns cremastogyne) and cypress (Cupressus funebris) (MPAC) in the hilly area of central Sichuan Basin (HACSB), China. 25 samples in an age sequence of 10-, 15-, 20-, and 25-year-old MPAC and 30-year-old pure cypress plantation (PCP) were selected by the method of spatial-temporal transition and 150 soil samples were collected at 0-15 and 15-30 cm layers to study the soil nutrient dynamics. The concentrations of soil organic carbon (SOC), total nitrogen (Ntot) and available nitrogen (AN) in purplish soil under MPAC increased significantly within initial 15 years (p<0.01 or 0.05) and then declined gradually from 15- to 30-year-old. The concentrations of total phosphorus (Ptot) and total potassium (Ktot) in 0-15 cm layer didn’t significantly change (p>0.05) during 30 years, while those of the 15-30 cm layer changed significantly (p<0.05). The concentrations of available phosphorus (AP) and available potassium (AK) in two layers changed with no significance (p>0.05) among five age stages. But the concentrations of SOC, Ntot, AN, Ptot, AP and AK in each age stand significantly declined (p< 0.01 or 0.05) with soil depth increase, but the Ktot concentrations declined with on significance (p>0.05) except for 20-year-old stands (p<0.05) because purplish soil is originally rich in potassium. The amounts of alder litter input and it’s fixation-N2 function are the principle reasons for the SOC, Ntot and AN dynamics related to stand ages and soil depths, but the ratios of uptake by the cypress root system and the return by its litters are the main reasons for Ptot dynamics. The results indicated that the plantation age and the change of dominant species composition of MPAC are the basic reasons for soil nutrient dynamics.
soil nutrient dynamics mized plantations of alder and cypress purplish soil hilly area of central Sichuan Basin
WU Pengfei ZHU Bo
Life Sciences and Technologies of Southwest University for Nationalities,Chengdu 610041,Sichuan,Chin Institute of Mountain Hazards and Environments,Chinese Academic of Sciences,Chengdu 610041,Sichuan,C
国际会议
2009 International Symposium on Environmental Science and Technology(2009环境科学与技术国际会议)
上海
英文
465-472
2009-06-02（万方平台首次上网日期，不代表论文的发表时间）