摘要
人工梭梭林(Haloxylon ammodendron)在防风固沙和土壤改良方面具有重要的生态作用。人工梭梭林土壤理化性质在时间序列和垂直空间上的动态变化规律研究结果表明:(1)在1973—2008年的时间序列上,林地土壤含水量和有效钾呈双峰曲线形式,峰值分别出现在1986年和2003年,最低值则在2008年;随种植年限的延长,土壤pH值在0—40cm各土层呈先增加后减小的趋势,在40—100cm各土层则表现为双峰曲线,峰值同样在1986年和2003年;土壤电导率呈波浪形变化;土壤有机碳和有效磷含量呈先增大后减小的趋势;有效氮则呈增加的趋势。(2)0—100cm的垂直空间上,林地土壤含水量、电导率随深度增加而增大,土壤pH值和土壤养分随深度增加而减小。综上,人工梭梭林土壤理化性质随种植年限的增加而逐渐改善,在种植年限为28年时效果最明显,以后趋于稳定。
Planted Haloxylona mmodendron(H.ammodendron)stand has an important ecological effect on sand fixation and soil improvement.The changes of soil physicochemical properties were discussed under the time series and the vertical space in H.ammodendron plantation.The results showed that:(1)in the time series of 1973—2008,the changes of soil water content(SWC)and soil available potassiumfollowed the bimodal curve,and the peak values were observed in 1986 and 2003,respectively,the soil pH value of 0—40cm layer increased at first and then decreased,while in 40—100cm,the change followed the bimodal curve and the peak was observed in 1986 and 2003,respectively,the electrical conductivity(EC)showed in a wave type and the contents of soil organic carbon and available phosphorus increased at first and then decreased gradually,while the available nitrogen content increased;(2)In the vertical direction,the SWC and EC increased with the increase of depth,while the pH value and soil nutrient decreased.In summary,soil physical and chemical properties improved gradually overtime of plantation,and the effect was most obvious in 29-year stands,and then tended to be stable.
出处
《水土保持研究》
CSCD
北大核心
2016年第6期309-315,共7页
Research of Soil and Water Conservation
基金
"十二五"国家科技支撑计划项目(2012BAD16B03)
公益性科研院所基本科研业务费专项(XMBM000002014
KY201516)
关键词
人工梭梭林
造林时间
土壤理化性质
Haloxylon ammodendron plantation
afforestation time
soil physical and chemical properties
