青海大通不同退耕还林时间梯度对土壤物理性状的影响  

Effects of Different Time Gradient of Cropping Land Conversion to Forest on Soil Physical Properties in DaTong County of QingHai

作　　者：李文忠[1] 张伟华[1] 张昊[1] 周心澄[1] 王荣秀[2] 

机构地区：[1]北京林业大学水土保持学院 [2]青海省大通县实验林场,桥头镇810100

出　　处：《干旱区资源与环境》2005年第3期137-140,共4页Journal of Arid Land Resources and Environment

基　　金："十五"国家科技攻关项目"退耕还林还草工程区水土保持型植被建设技术研究与示范"(2001BA510B01)

摘　　要：本文主要探讨不同退耕还林时间梯度上土壤物理性质的变化规律及其对土壤物理性状的改良作用,研究表明,退耕地营林后对土壤各种物理性状影响极大,使其能在短时间内土壤向森林土壤定向演化,且时间越长,土壤结构改善越明显:总孔隙度增大、土壤水气热协调性增强、土壤持水能力及其供水肥能力加强,有利于涵养水分和保持水土,土壤的抗蚀能力显著增强。The researchmainly investigated the variation and improvement of soil physical properties under different time gradient of cropping land to forest. The results showed that there had a huge influence on soil physical properties after converting cropping land to forest, and made it evolve directively to forest soil in short time. With the continuance of the time, soil structure was improved obviously, total porosity increased, and its ability of water retention, nutrient supplement and anti-erosionwas improved.

关 键 词：青海 退耕还林 土壤 物理性状 水分 

分 类 号：S152[农业科学—土壤学] S727.2[农业科学—农业基础科学]