防护林对库布其沙漠土壤理化性质的影响

发布时间：2018-08-13 09:59

【摘要】：结合野外采样和室内分析,对库布其8种防护林0~100 cm的土壤水分和0~60 cm的土壤养分进行分析.0~100 cm土壤水分随着土层深度逐渐增加,土层和防护林类型均对土壤水分有极显著影响,8种防护林样地的土壤水分从大到小依次为:旱柳+小美旱扬旱柳沙枣+沙柳沙枣速生杨速生杨+羊柴拧条羊柴.对0~60 cm的土壤养分分析表明,土层对7个土壤养分指标均无显著影响,表土层0~10 cm土壤养分高于10~60 cm土层的,表现出土壤养分的表聚效应.防护林类型对7个土壤养分指标均有极显著影响,柠条和旱柳样地中土壤养分较高,羊柴样地中土壤养分相对较低.结果表明:旱柳、旱柳+小美旱杨和柠条等防护林对土壤的改良作用较好,土壤有较好的水分和养分条件,林下草本植被的物种多样性和盖度都较高,羊柴和速生杨防护林表明对流沙的改良作用较差,土壤水分和养分较低,林下草本植物的物种多样性和盖度均较低.
[Abstract]:Combined with field sampling and indoor analysis, the soil moisture of 0 ~ 100 cm and 0 ~ 60 cm soil nutrients of 8 types of protective forest in Kubuqi were analyzed. The soil moisture of 0 ~ (100) cm increased with the depth of soil layer. Soil layer and shelterbelt type have very significant influence on soil moisture. The order of soil moisture in 8 kinds of shelterbelt plots is as follows: small willow, millet, dry willow, jujube, sand jujube, sandy jujube, sand jujube, Yang Yang, fast-growing Yang Yang to tighten the wood of sheepwood The results of soil nutrient analysis at 0 ~ 60 cm showed that there was no significant effect of soil layer on 7 soil nutrient indexes, and the soil nutrient of 0 ~ 10 cm soil layer was higher than that of 10 ~ 60 cm soil layer, which showed the superaggregation effect of soil nutrient. The type of shelterbelt had a significant effect on the seven soil nutrient indexes. The soil nutrient of Caragana korshinskii and willow land was higher than that of sheep and wood land. The results showed that the shelterbelts such as Salix willow, Populus humilis and Caragana korshinskii had better effects on soil improvement, soil had better water and nutrient conditions, and the species diversity and coverage of undergrowth herbaceous vegetation were higher. The shelterbelts of Lamb and Fast-growing Poplar showed that the improvement of shifting sand was poor, the soil moisture and nutrients were lower, and the species diversity and coverage of undergrowth herbaceous plants were lower.
【作者单位】：中国科学院西北生态环境资源研究所沙漠与沙漠化重点实验室;中国科学院科技战略咨询研究院;中国科学院大学;
【基金】：国家重点研究发展计划项目(2016YFC0500902) 国家科技支撑计划项目(2015BAC06B01) 甘肃省科技支撑计划项目(1504FKCA096)
【分类号】：S714.2

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