摘要
为了解压实对城市新建绿地土壤物理性质的影响,以西安植物园新园区为研究对象,依据土壤压实程度的不同以及地表植被的差异进行区域划分,对不同区域内的土壤分层采样,并进行土壤容重、孔隙状况、水分常数等物理性质的测定。结果表明:随着压实程度的增加,土壤各层次间的发生规律发生了改变,土壤出现退化现象。研究区域内的土壤容重偏高,平均值为1.52 g/cm3;土壤总孔隙度、通气孔隙度、土壤含水量、田间持水量、土壤饱和导水率明显偏低,平均值分别为44.71%、12.81%、15.46%、20.77%、20.7 mm/h。土壤容重与总孔隙度、通气孔隙度、田间持水量、自然含水量、饱和导水率之间呈极显著的负相关;通气孔隙度与饱和导水率、自然含水量、田间持水量之间均呈现显著的正相关。压实对各层土壤物理性质的影响表现为表层土>浅层土>深层土,人为践踏产生的压实只影响到表层土壤。
This paper studied the effects of compaction to soil physical property of new city green space.Taking the new park of Xi＇an Botanical Garden to be the object of research, the authors divided the gardeninto districts according to differences soil compaction degree and surface vegetation. Soil samples werecollected from different layers in different districts to determine the soil bulk density, pore status and moistureconstant. The results showed that the occurrence rules of soil of various layers changed and soil degradationappeared with the increase of compaction degree. The soil bulk density was on the high side in the studydistricts and the average value was 1.52 g/cm3. The soil total porosity（44.71%）, aeration porosity（12.81%）, soilwater content（15.46%）, field capacity（20.77%） and soil saturated water conductivity（20.7 mm/h） wereobviously low. Soil bulk density was significantly and negatively correlated with total porosity, air porosity andfield capacity, natural moisture content, saturated hydraulic conductivity. Aeration porosity was significantlyand positively correlated with saturated hydraulic conductivity, natural water content, and field capacity.Compaction effects on soil physical property of each layer were surface soil shallow soil deep soil. Thecompaction of people trample only affected the surface soil.
出处
《中国农学通报》
2015年第28期166-172,共7页
Chinese Agricultural Science Bulletin
基金
陕西省财政专项"园林绿化植物新品种新技术示范应用"(2013-102)
陕西省科技统筹创新工程计划项目"绿色生态型园林科技示范工程"(2011KTCL02-22)
关键词
城市土壤物理性质
压实
容重
孔隙度
urban soil physical properties
compaction
bulk density
porosity
