摘要
通过分析祁连山东段天祝县地区5种植被类型(丛生禾草草地、银露梅灌丛、青海云杉林、青海云杉-白桦混交林和白桦林)覆盖下土壤碳、氮、磷含量的变化情况,研究了不同植被对土壤养分的影响。结果表明:植被对土壤养分具有表聚效应,不同植被覆盖下的土壤0-20cm土层养分含量显著高于20-40cm土层(p<0.05),乔木林的表聚效应强于灌丛和草地。随上覆植被从草本植物到灌木再到乔木的变化,土壤有机碳、全氮、铵态氮和速效磷等养分均呈现出逐渐增加的趋势(p<0.05);硝态氮含量变化情况为白桦林>银露梅灌丛>青海云杉林>青海云杉-白桦混交林>丛生禾草草地,土壤全磷除白桦林下较高外,其他4种植被之间都无显著差异(p>0.05)。青海云杉-白桦混交林维持土壤养分平衡的能力强于其他4种植被。
By analyzing carbon,nitrogen and phosphorus changes of 0-20 cm soil layer and 20-40 cm soil layer under the five vegetation types,we studied the effects of different vegetation on soil nutrients in Tianzhu County of the Eastern Qilian Mountain.The results indicated： vegetation can significantly improve the surface soil nutrient,and surface aggregation effect of arbor is stronger than shrub and grass.With the changes of vegetation from grass to shrub and then to arbor,soil organic carbon,total nitrogen,ammonium nitrogen and available phosphorus show a growing trend（p0.05） while there is no significant changes in soil total phosphorus.Changes in nitrate nitrogen are complex due to many factors.Taking all factors into consideration,the ability to maintain the soil nutrient balance of Qinghai spruce-birch mixed forest is stronger than the other four vegetations.
出处
《水土保持研究》
CSCD
北大核心
2011年第5期166-170,共5页
Research of Soil and Water Conservation
基金
国家基础科学人才培养基金(J0730536)
兰州大学中央高校基本科研业务费专项资金(lzujbky-2009-70)
关键词
祁连山
植被
土壤养分
土壤-植物系统
Qilian Mountains
vegetation
soil nutrient
soil-vegetation ecosystem
