LI Shi-rong,LI Yong-gui,DUAN Shu-huai,et al.Study on Changes of Soil Physiochemical Property Under Converting Cropland to Forest in Datong of Qinghai Province[J].Research of Soil and Water Conservation,2009,16(02):132-137.
青海大通退耕还林地土壤理化性状演变研究
- Title:
- Study on Changes of Soil Physiochemical Property Under Converting Cropland to Forest in Datong of Qinghai Province
- 分类号:
- S153
- 摘要:
- 生物的生存与发展与土壤密不可分,研究土壤的变化对于整个生态修复过程意义重大.探讨退耕还林工程对土壤理化性状的影响,可以为工程的顺利实施提供相关科学依据.在标准地内典型地段挖取剖面,并用环刀每隔10cm分层取土样,并测定土壤的理化指标.结果表明:在0-20cm土层,淋溶棕褐土总孔隙度、毛管孔隙度和最小持水量随退耕还林年限增长其变化规律基本一致,呈不规则的“S”型曲线;有机质和碳的变幅以农耕地、退耕18a和32a天然林最大,呈“V”型变化;土壤C/N趋于减小,表明在退耕还林地上土壤氮素供应充足.在0-20cm土层,土壤密度与全氮、碳含量负相关,与黏粒含量正相关,而在20-40cm土层,土壤密度与全氮、碳含量和黏粒含量均呈极显著正相关.当各种外应力侵蚀土壤时,对土壤的损伤随侵蚀深度加深而加重;由于土壤黏粒与全氮、碳含量正相关,土壤黏粒减少导致土壤的氮素衰减和稳定性降低.
- Abstract:
- The soil is very important for survival and development of biological and researching the change of soil physiochemical properties are significance for the process of ecological remediation.The study on the impacts of converting cropland to forest for physiochemical property of soil could provide scientific bases for the project development favorably.We collect the samples from the sections every ten centimeters from the top to the bottom in sample plot with the cutting ring and test the physical and chemical properties.The results showed that in the soil genetic horizon of 0-20 cm,with the age increasing of converting cropland to forest; the porosity,capillary porosity,and the minimum water-holding capacity took on the uniform trend of ‘S’ curve,and the organic content and carbon content showed‘V’ curve,the maximum occurred in the arable land and 18 a and 32 a natural forests of converting cropland to forest;the C/N took on down trend,indicating that the N was in under-supply in the converting cropland to forest.In addition,in the soil genetic horizon of 0-20 cm,the soil density is negatively related to the N content and C content,and positively related to clay content.However,in the 20-40 cm soil horizon,the soil density is significant positively to the content of N,C and clay particle.When the soil erosion occurred by the different exogenic forces,the soil damage degree increased with the soil horizon deepening.Due to the content of clay particle is positively correlated with the content of N and the content of C,so the decreasing of clay led to the attenuation and stability falling of N.
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备注/Memo
收稿日期:2008-10-10;改回日期:。
基金项目:国家“十五”攻关课题项目(2001BA510B0102)
作者简介:李世荣(1975- ),男,山西昔阳人,博士,高级工程师,研究方向:水土保持与生态环境工程.E-mail:lishirong1975@126.com