摘要
土壤侵蚀问题一直是备受关注的热点问题,为了深入探究土壤侵蚀与土壤理化性质的相关性,利用137Cs核示踪技术,在赣榆区针阔混交林以及由针阔混交林改造而成的山楂林、苹果林和板栗林四种林分进行采样分析,对该地区的土壤侵蚀特征进行定量评价。结果表明:①针阔混交林土壤137Cs含量为546. 92Bq/m^2,经济林营造降低了土壤137Cs含量。针阔混交林土壤年均流失厚度为0.79mm,苹果林、山楂林和板栗林的土壤年平均流失厚度分别是针阔混交林的2.92倍、2.33倍和1.10倍。②研究区的土壤137Cs与土壤全氮和土壤有机碳呈极显著正相关(P<0.01),与土壤碳氮比呈显著正相关(P<0.05),与其他土壤理化性质无显著相关关系。土壤137Cs与粒径<0.25 mm、0.25~0.5 mm及0.5~1 mm团聚体有机碳含量呈极显著正相关(P<0.01),与粒径>1 mm团聚体有机碳含量呈显著正相关(P<0.05)。经济林营造使得土地利用方式改变在影响土壤侵蚀量的同时,也在影响不同土地利用方式的土壤部分养分指标和团聚体有机碳。
Soil erosion has always been a hot topic. In order to explore the correlation between soil erosion and various soil physical and chemical properties,this paper used 137Cs nuclear tracer technology to sample and analyze 4 kinds of forests,including coniferous and broad-leaved mixed forest( CBF),hawthorn forest( HF),apple forest( AF) and chestnut forest( CF),transformed from coniferous and broad-leaved mixed forest in Ganyu District,and conducted quantitative evaluation on the soil erosion characteristics in this area. The results showed that:① The soil 137Cs content of CBF was 546.92 Bq/m^2,and building of economic forest had reduced the soil 137Cs content. The thickness of annual soil loss in CBF was 0.79 mm. The average annual soil loss thickness of AF,HF and CF were 2.92 times,2.33 times and 1.10 times of that of CBF.② There was extreme significant positive correlation between soil 137Cs in research area and soil total nitrogen and soil organic carbon( P<0.01),and also significant positive correlation with soil carbon and nitrogen ratio( P<0.05). While,there was no significant correlation with the other soil physical and chemical properties. Soil 137Cs showed an extremely significant positive correlation with the organic carbon content of aggregates with grain size <0.25 mm,0.25~0.5 mm and 0.5~1mm( P<0.01),and a significant positive correlation with the organic carbon content of aggregates with grain size >1 mm( P<0.05). The building of economic forest had enabled the changes in land utilization type,affected soil erosion,and at the same time also affected soil nutrient index and aggregate organic carbon in different land utilization types.
作者
朱茜
林杰
张阳
ZHU Xi;LIN Jie;ZHANG Yang(Co-Innovation Center for Sustainable Forestry in Southern China, Jiangsu Province Key Laboratory of Soil and Water Conservation and Ecological Restoration, Nanjing Forestry University, Nanjing 210037;College of Forestry, Nanjing Forestry University, Nanjing 210037, China)
出处
《中国农业科技导报》
CAS
CSCD
北大核心
2019年第6期135-142,共8页
Journal of Agricultural Science and Technology
基金
国家重点研发项目(2017YFC0505500)
国家自然科学基金项目(31870600)
江苏高校优势学科建设工程项目资助
关键词
土壤侵蚀
137Cs
经济林营造
相关性分析
soil erosion
137Cs
economic forest construction
correlation analysis
