草屑覆盖对改良土壤的作用+文献综述
时间:2018-04-18 20:47 来源:毕业论文 作者:毕业论文 点击:次
| 摘要：草屑是园林废弃物的重要组成部分，目前主要的处理方式为掩埋或随意焚烧，不仅污染大气更造成农业资源浪费。本课题主要通过研究草屑覆盖物对土壤理化性质状况的影响，分析草屑作为覆盖物的主要生态功效及对园林土壤改良产生重大作用的机理，为草屑资源的再利用与园林覆盖提供相应的理论依据与技术支持。实验对草屑覆盖物下土壤容重，温度，pH，水解N，速效P、K及全N、P、K含量，有机质含量，微生物含量等理化指标进行了连续四年的数据测量并进行了系统对比分析，结果表明：草屑作为土壤覆盖物可有效提高土壤的含水性与孔隙度，调节不同季节土壤表层温度。随着覆盖厚度的增加，土壤有机质，水解N，速效P、K含量提高，其中覆盖厚度为8cm的效果最为明显，全N、P、K含量结果显示差距不大，但仍有缓慢增加的趋势。另外，土壤修复是一个相对较漫长的过程，四年的覆盖处理还不足以明显改良土壤性质。21386 毕业论文关键词：草屑；覆盖物；土壤；理化性质；改良 Effects of grass cover on soil Abstract: Grass is an important part of garden waste, at present the main treatment is to burial or burning freely, not only pollute the air but also waste agricultural resource. This issue primarily researches the physical and chemical properties of soil mulched by grass and analysis the ecological effect of grass cover principal and significant mechanism on garden soil, garden covered in grass resources utilization and provides the theoretical basis and technical support. The experiment studies the physic-chemical indicators of soil which contains the property of soil capacity heavy, temperature, pH, available and total N, P, and K content, organic matter content, microbial content, and then we continue discuss and system contrast analysis the four years’ data measurement, results indicates that: grass chip, as soil cover, can effectively improve soil of containing waterborne and pore degrees, regulate different season soil surface temperature. With increasing cover thickness, soil organic matter, available N, P, K content increased, what’s more, effects of cover thickness of 8cm most visible ,however ,effect of total N, P, K didn’t increase too much, but it’s still have a slow upward trend. In addition, soil remediation is a relatively lengthy process, and for four years was not enough to significantly improve the coverage of soil properties. Keywords: Grass；Cover；Soil；Physical and chemical properties；Improvement 目录 摘要 i Abstract i 目录 ii 1 绪论 1 1.1 研究背景 1 1.2 目前国内外的研究进展 2 1.3 研究目的与意义 3 2 实验材料与方法 4 2.1 覆盖材料 4 2.2 实验主要仪器与试剂 4 2.2.1 主要仪器 4 2.2.2 试剂 4 2.3 实验总体方法设计 4 2.3.1 试验地处理 4 2.3.2 土壤样品处理 4 2.3.3 土壤理化性质测定 5 2.4 土壤理化性质指标具体测量方法 5 2.4.1 土壤容重、含水量、孔隙度的测量 5 2.4.2 土壤温度测定 5 2.4.3 土壤微生物检测 5 (责任编辑：qin) |