摘要
对降水量小于200mm的沙坡头无灌溉条件下人工植被固沙区土壤有机碳和全氮含量变异进行研究。结果表明,流沙在固定过程中,人工植被固沙体系的营建改善了成土环境,促进了生物地球化学循环,使土壤碳、氮的含量和分布规律发生了变化:①固沙区土壤有机碳和全氮含量及C／N均高于流沙区,随土层深度增加土壤有机碳和全氮含量呈逐渐降低趋势,而C／N呈逐渐升高趋势;②不同年限固沙区间土壤有机碳、全氮含量及C／N变异小于土层垂直方向的变异;③不同年限固沙区土层垂直方向土壤有机碳和全氮含量及C／N变异较大,变异主要存在于结皮层及其下土层(0～5cm);④流沙区土壤碳、氮含量及C／N低于固沙区,而且在土层垂直方向上基本无变异。
This paper mainly studies the variation of soil organic carbon and total nitrogen in planted sand regions without irrigation in the area of the precipitation below 200 mm. The results show that with the succession from artificial plants to natural vegetation, environment of soil formation and circulation of soil material were influenced, and the soil organic carbon and total nitrogen have been changed: (1)The content of soil organic carbon, total nitrogen, and C/N value in the planted regions have been increased compared with sand-shifting region, moreover, the soil organic carbon and total nitrogen content have a decreasing variation with soil depth increasing; (2)Soil organic carbon and total nitrogen content, C/N value in the shifting sand have a relative small variation with the increasing of soil depth; (3)The variation of soil properties in the planted regions has not obvious rule with the increasing time-spans since planting, and there are no distinctions between sand regions with different stabilization time-spans, but the development of 0～5 cm layer is closely connected with the crust layer.
出处
《中国沙漠》
CSCD
北大核心
2004年第4期437-441,共5页
Journal of Desert Research
基金
科技部 973"项目专题(G2000048704)
中国科学院寒区旱区环境与工程研究所2004年创新项目资助
关键词
人工固沙区
土壤有机碳
土壤氮
变异
植被
planted sand region
soil organic carbon
soil nitrogen
variation
