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定向演化
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    The physical and chemical properties of soil converts to the feature of natural forest in four types of 23 years of mixed forest.
    23年生4种混交林土壤理化性质发生定向演化[1],土层形态分异趋向天然林剖面[2]。
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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。

The fertility effects were studied on different figuration model of mixed forest in Datong county of upper stream of the Yellow River.The figuration style was optimized.The results were as follows.The artificial forest with different figuration style could evidently increase soil fertility,decrease soil pH value and improve living conditions of trees.The physical and chemical properties of soil converts to the feature of natural forest in four types of 23 years of mixed forest.Through the analysis on 10 indicators...

The fertility effects were studied on different figuration model of mixed forest in Datong county of upper stream of the Yellow River.The figuration style was optimized.The results were as follows.The artificial forest with different figuration style could evidently increase soil fertility,decrease soil pH value and improve living conditions of trees.The physical and chemical properties of soil converts to the feature of natural forest in four types of 23 years of mixed forest.Through the analysis on 10 indicators about soil physical and chemical properties and soil environment and up ground biomass etc.,the sequence of optimal models is Populus cathayana×Hippophae rhamnoides>Larix principi-rupprechii×H.rhamnoides>Picea crassifolia×H.rhamnoides>Betula platyphylla×H.rhamncides.

对比分析研究了青海大通黄河上游混交林不同配置模式对土壤肥力效应的影响,进而确定当地混交林优化配置方式。结果表明:不同混交配置方式的人工林均能一定程度提高土壤肥力水平,改善林木生存环境,且不同混交配置方式间存在显著差异。23年生4种混交林土壤理化性质发生定向演化[1],土层形态分异趋向天然林剖面[2]。通过对土壤理化性状及其土壤环境和地上生物量10个指标统计分析,混交林优化模式为:青杨×沙棘>华北落叶松×沙棘>青海云杉×沙棘>白桦×沙棘。

 
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