摘要
在宁夏固原上黄试验区,对灌木林地、农地、天然草地、果园和人工草地5种土壤的化学性质进行了分析,探讨了土地利用方式对土壤有机碳的影响。结果表明1表层土壤有机碳含量表现为天然草地>灌木林地>农地>人工草地>果园;2灌木林地和果园土壤有机碳含量随土层加深而变化幅度较小,而天然草地、人工草地和农地随土层加深而递减的幅度较大;30～20cm天然草地和灌木林地的有机碳密度普遍偏高,而农地、果园和人工草地则均较低;而20～40cm和0～40cm的土层内土壤有机碳密度相比之下灌木林地、农地和天然草地相差不大,而果园和人工草地相对较低。
In Shanghuang,Guyuan experimental region of Ningxia,bush forest land,farmland,natural meadow,orchard and artificial meadow were researched.Soil organic C under different usage modes were researched.The results were shown:①the content of organic C was natural meadow>bush forest land>farmland>artificial meadow> orchard in top layer;②the content of organic C of bush forest land and orchard land decrease slowly,but farmland,natural meadow and artificial meadow decrease rapidly as depths of profile increases; ③the organic C density of natural meadow and bush forest land is higher than farmland,artificial meadow and orchard at large in 0～20 cm; while the organic C density of natural meadow,bush forest land and farmland is higher than artificial meadow and orchard in 20～40 cm and 0～40 cm.
出处
《水土保持研究》
CSCD
北大核心
2005年第3期47-49,114,共4页
Research of Soil and Water Conservation
基金
国家自然科学基金(40461006)
国家"十五"科技攻关项目(2001BA606A-04)
西北农林科技大学优秀人才专项基金(04ZX011)
关键词
宁夏固原
土地利用方式
有机碳含量
剖面变化
有机碳密度
Guyuan in Ningxia
land usage modes
the content of organic C
profile property
organic C density
