论文部分内容阅读
以长沙市南郊山地丘陵区为研究对象,选择7种不同土地利用方式(次生林地、经济林地、杉木人工林、采伐迹地、撂荒地、苗圃地、坡耕地)研究了城乡交错带不同土地利用方式对土壤理化性质的影响。结果表明:7种土地利用方式下,土壤颗粒组成主要集中在1～0.05mm和<0.001mm两个粒级范围内,土壤质地以重壤土和轻粘土为主。随着人为干扰程度的减弱,土壤砂粒(1.0～0.05mm)、土壤粉粒(0.05～0.01mm)百分率逐渐下降,<0.01mm的土壤物理性粘粒百分率增加。自然、半自然状态利用方式的林地(次生林地、经济林地、杉木人工林地)土壤总孔隙度、含水量普遍较高,土壤密度低于坡耕地、苗圃地、撂荒地、采伐迹地,而土壤pH值、有机质含量及氮、磷、钾含量普遍高于坡耕地、苗圃地、撂荒地、采伐迹地。
Taking the hilly land in the southern suburbs of Changsha City as the research object, seven different land use patterns (secondary forest land, economic forest land, Chinese fir plantation, deforested land, abandoned land, nursery land and sloping farmland) were selected to study the land use patterns Impact on soil physical and chemical properties. The results showed that under the seven land use types, the soil particle composition mainly concentrated in the two grain sizes of 1 ~ 0.05mm and <0.001mm. The soil texture mainly consisted of heavy loam and light clay. With the reduction of human disturbance, the percentage of soil sand (1.0 ~ 0.05mm) and soil silt (0.05 ~ 0.01mm) decreased gradually, while the percentage of physical clay of <0.01mm increased. Natural and semi-natural land use types of forest (secondary forest, economic forest, Chinese fir plantation) soil total porosity and water content is generally higher, soil density is lower than sloping land, nursery, abandoned land, deforested land, and soil pH The contents of organic matter, nitrogen, phosphorus and potassium were generally higher than those of sloping land, nursery land, abandoned land and deforested land.