干热河谷区6种典型林型土壤改良效应评价

发布时间：2018-01-18 00:21

本文关键词：干热河谷区6种典型林型土壤改良效应评价　出处：《中国水土保持科学》2016年02期 　论文类型：期刊论文

【摘要】：采用野外调查和室内分析相结合的方法,测定巧家县境内干热河谷区6种典型林型(华山松+马桑+黑麦草、华山松+兴安落叶松、核桃、华山松、花椒、桑树)林地和对照(农田)的主要理化性质,并利用隶属函数评价法,评价6种林型的土壤改良效应,旨在为退耕还林筛选理想的林型提供科学依据和实践参考。研究结果表明:1)退耕后,不同林型林地土壤物理结构得到不同程度改善,土壤养分状况进一步好转,土壤密度、土壤含水量、有机质质量分数、土壤全量养分和速效养分的质量分数均表现为乔灌草混交林乔木混交林纯林;2)不同林型土壤改良效应综合评价结果为华山松+马桑+黑麦草华山松+兴安落叶松华山松农田桑树核桃花椒,华山松+马桑+黑麦草乔灌草混交模式土壤改良综合效应最佳,其次是华山松+兴安落叶松:在不同树种的纯林之间,华山松土壤改良效应综合评价最高,核桃和桑树土壤改良效应综合评价相当,花椒最差。可见,华山松+马桑+黑麦草乔灌草混交是当地土壤改良的理想模式,适宜大力推广。
[Abstract]:Six typical forest types in dry and hot valley area of Qiaojia County were determined by combining field investigation and indoor analysis (Ryegrass, Pinus chinensis, Larix gmelinii, walnut, Pinus huashanensis, Zanthoxylum bungeanum) in Qiaojia County. The main physical and chemical properties of mulberry woodland and control (farmland) were evaluated by the method of membership function to evaluate the soil improvement effect of 6 forest types. The purpose of this study was to provide scientific basis and practical reference for the selection of ideal forest types. The results showed that the soil physical structure of different forest types was improved to different extent after returning to farming. Soil nutrient status was further improved, soil density, soil water content, organic matter mass fraction, soil total nutrient and available nutrient mass fraction were all shown as pure forest of Arbor, shrub and grass mixed forest. 2) the comprehensive evaluation results of soil improvement effects of different forest types were as follows: Pinus massoniana, ryegrass, ryegrass, Pinus gmelini, Pinus gmelini, Pinus olgensis, Pinus olgensis, Pinus olgensis, Pinus olgensis. The comprehensive effect of soil improvement was the best in the mixed model of Arbor mulberry, ryegrass and ryegrass, followed by Larix gmelinii: among the pure forests of different tree species, the comprehensive evaluation of soil improvement effect of Pinus huashanensis was the highest. The comprehensive evaluation of soil improvement effects of walnut and mulberry trees was similar, and that of Zanthoxylum bungeana was the worst. Therefore, the mixture of ryegrass and ryegrass was an ideal model for soil improvement, which was suitable for popularizing vigorously.
【作者单位】：北京林业大学水土保持与荒漠化防治教育部重点实验室;
【基金】：国家林业局公益性行业科研专项“南方退耕还林工程建设效益监测评价研究”(201004018)
【分类号】：S714.6
【正文快照】： 项目名称:国家林业局公益性行业科研专项“南方退耕还林工程建设效益监测评价研究”(201004018)退耕还林是一项长期而复杂的生态工程,目的是恢复植被,减少水土流失,防沙治沙,改善日益恶化的生态环境[1]。土壤退化是目前全球最严重的环境问题之一,土壤是气候、母质、生物、地形

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