梭梭固沙林演替过程中土壤粒径与碳氮含量的变化规律

Changes of Soil Particle Size and Carbon and Nitrogen Content during the Succession of Haloxylon ammodendron Sand-fixing Forest

以民勤沙区0、15、35、55年的人工梭梭固沙林土壤为研究对象,采用方差分析和线性拟合的方法探讨不同年限人工梭梭固沙林土壤粒径与碳氮含量的变化规律。结果表明,随造林年限的增加,土壤黏粒(0.01~2.00μm)、粉粒(>2.00~20.00μm)、细沙粒(>20.00~200.00μm)、有机碳(SOC)和全氮(TN)含量均明显升高且表层(0~5 cm)增加幅度较大,粗沙粒(>200.00~2000.00μm)含量降低。土壤SOC与土壤TN含量呈线性正相关;土壤SOC、TN含量与土壤黏粒、粉粒、细沙粒含量呈线性正相关,但与土壤粗沙粒含量呈线性负相关。说明在沙区种植固沙植被有利于加速成土过程和固定碳氮。

Taking 0,15,35,and 55 years of artificial Halxylon ammodendron sand-fixing forest soil in Minqin sandy area as the research object,the variance analysis and linear fitting methods were used to explore the variation law of soil particle size and carbon and nitrogen content of artificial Halxylon ammodendron sand-fixing forest in different years.The results showed that with the increase of afforestation years,the contents of soil clay(0.01-2.00μm),silt(>2.00-20.00μm),fine sand(>20.00-200.00μm),organic carbon(SOC)and total nitrogen(TN)were significantly increased,and the surface layer(0-5 cm)increased greatly,the content of coarse sand(>200.00-2000.00μm)decreased.There was a linear positive correlation between soil SOC and soil TN content,and a linear positive correlation between soil SOC,TN content and soil clay,silt,fine sand content,but a linear negative correlation between soil SOC,TN and soil coarse sand content.It showed that planting sand-fixing vegetation in sandy area was beneficial to accelerate soil-forming process and fix carbon and nitrogen.