马尾松叶片凋落物不同输入量对土壤有机碳、全氮含量及PH产生的动态变化

Dynamic changes of soil organic carbon,totalnitrogen and PH under different inputs of Pinus massoniana litters

研究马尾松(Pinus massoniana)叶片凋落物不同输入量对土壤有机碳的动态变化,结果表明:马尾松叶片凋落物不同输入量及分解时间对土壤有机碳含量影响显著(P<0.05)。随着凋落物输入量的增加,土壤有机碳含量、全氮含量逐渐增加,PH逐渐降低。不同输入量处理的土壤有机碳含量为500 g·m^(-2)>400 g·m^(-2)>300 g·m^(-2)>200 g·m^(-2)>100 g·m^(-2);随着分解时间的增加,土壤有机碳平均含量呈递增规律:2个月<4个月<6个月<8个月<10个月<12个月。不同输入量及分解时间土壤有机碳的增长率不同,分解时间在4个月至6个月时,土壤有机碳含量的增长最快。当凋落物输入量小于300 g·m^(-2)时,10个月后凋落物对土壤有机碳的输入停止。

A systematic investigation was made to clarify the effects of different inputs and decomposition time of Pinus massoniana litters on the soil organic carbon.The results showed that the content of soil organic carbon was depended mainly on the different inputs and decomposition time of Pinus massoniana litter(P<0.05).Specifically,the soil organic carbon and total nitrogen content increased gradually with the increase of litter inputs,whereas,the PH decrease gradually.The soil organic carbon(SOC)contents were ranked in the descending order of the 500 g·m^(-2)>400 g·m^(-2)>300 g·m^(-2)>200 g·m 2>100 g·m^(-2)input treatments.Furthermore,the average contents of soil organic carbon showed an increasing trend with the increase of decomposition time,i.e.,2 months<4 months<6 months<8 months<10 months<12 months.The growth rate of soil organic carbon was also greatly varied in the different input and decomposition time.The highest increase was achieved in the soil organic carbon contents,when the decomposition time was from 4 to 6 months.Once the litter input was less than 300 g·cm^(-2),the litter input to soil organic carbon stopped after 10 months.