摘要
为探讨黄土丘陵区不同龄沙棘生长对生态环境的影响,测定安塞站实验区4-15年不同龄沙棘林土壤水分和养分变化特征。结果表明,沙棘林地土壤含水量在根系微弱利用层（0-20 cm）和根系利用层（20-300cm）范围内,随着沙棘林龄增加,土壤含水率随土层深度的增加呈下降的趋势。4-15龄沙棘平均碱解N积累量为28.0 g/kg,8龄沙棘碱解N、速效P分别为28.0和1.72 g/kg;12龄碱解N、速效P分别为29.2和1.18 g/kg。随着沙棘林龄增加,速效P积累量呈下降趋势,而碱解N呈增加的趋势,最大值15龄沙棘积累量为30.2 g/kg。实验区域内土壤呈碱性,pH值在8.0-8.6之间变化。随沙棘树龄的增长,其土壤pH值呈上升趋势。
In order to discuss the effect of hippophae with different ages to the ecological environment in hilly and gully region on the Loess Platea,an experiment was made in a plot in Ansai station to study the soil moisture and nutrient change characteristics of the field with different ages of hippophae.The result indicated that the soil moisture content of hippophae forest land in the root system weak use level（0～20 cm） and normal use level（20～300 cm） showed a decline tendency along with aging of hippophae and increase of soil layer depth.The average exactable nitrogen accumulation quantity of 4～15 a-aged hippophae is 28.0 g/kg,while the 8 a-aged hippophae＇s exactable nitrogen,fast-acting P are 28.0 and 1.72 g/kg respectively;and the 12 a-aged hippophae＇s exactable nitrogen,fast-acting P are 29.2 and 1.18 g/kg respectively.Along with the increase of hippophae＇s age,the fast-acting P accumulation quantity assumes a drop tendency,but exactable nitrogen assumes an increase one,with the maximum value of accumulation quantity of 15 a hippophae being 30.2 g/kg.Tests in the region show that the soil assumes the alkalinity,the pH value changes between 8.0～8.6. which diaplays a trend of escalation along with the hippophae treeage growth.
出处
《干旱地区农业研究》
CSCD
北大核心
2008年第5期115-117,123,共4页
Agricultural Research in the Arid Areas
