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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....

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.

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。

 
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