文章摘要
张发民, 杜兰兰, 袁瀛, 王山河, 郭胜利.土壤侵蚀和沉积对土壤理化性状的影响[J].水土保持学报,2021,35(6):161~167
土壤侵蚀和沉积对土壤理化性状的影响
Effects of Soil Erosion and Deposition on Soil Physical and Biochemical Properties
投稿时间:2021-08-04  
DOI:10.13870/j.cnki.stbcxb.2021.06.022
中文关键词: 侵蚀  沉积  径流  泥沙  土壤性状
英文关键词: soil erosion  deposition  runoff  sediment  soil properties
基金项目:国家自然科学基金面上项目"侵蚀—沉积过程中轻组有机碳的变化机制"(41371279);2021年省级水利发展资金水土保持项目"黄土高原沟壑区坡面水土流失状况变化及机理研究"
作者单位E-mail
张发民1, 杜兰兰2, 袁瀛1, 王山河1, 郭胜利2 1. 陕西省水土保持勘测规划研究所(陕西省水土保持生态环境监测中心), 西安 711000

2. 西北农林科技大学水土保持研究所
, 陕西 杨凌 712100 
llxbnlkjdx510@163.com 
摘要点击次数: 91
全文下载次数: 54
中文摘要:
      土壤侵蚀—沉积是影响陆地生态系统地球化学循环的重要机制之一。对土壤生物、化学和物理性质在侵蚀区和沉积区的空间分布特征进行系统分析,基于黄土高原地区的侵蚀—沉积地貌特征,模拟修建5°,10°和20° 3个坡度的侵蚀区,并于每个侵蚀区底端连接水平的沉积区。试验期间(2015—2019年)连续原位监测天然降雨条件下的径流量、泥沙量、土壤温度和水分,并采集土样分析土壤生物、物理和化学性质。结果表明:(1)随坡度增大,土壤侵蚀强度增强。相比5°坡,10°和20°坡的年径流量分别提高30%~115%和48%~207%,且年产沙量分别提高146%~505%和241%~742%;(2)沉积区土壤有机碳、可溶性有机碳、矿质氮、微生物量碳、氮的浓度和黏粒含量均显著高于侵蚀区,土壤δ13C相对丰度在侵蚀区显著高于沉积区,提高幅度为2.0%~3.3%;(3)试验土壤性状在侵蚀区和沉积区之间的差异随坡度增大而增加。研究结果揭示了土壤理化性状对土壤侵蚀和沉积具有相反的响应。
英文摘要:
      Soil erosion-deposition is one of the essential mechanisms affecting the geochemical cycle of terrestrial ecosystem. In this study, the spatial distribution characteristics of soil biological, chemical and physical properties in erosion sites and deposition sites were systematically analyzed. The erosion-deposition plots were constructed based on the erosion-deposition geomorphic characteristics of the China’s Loess Plateau, including erosion sites with three slope gradients of 5°, 10° and 20°, and each erosion site was connected with a deposition site. During the experimental period (2015—2019), continuous in-situ monitoring of runoff, sediment, soil temperature and moisture under natural rainfall conditions were conducted. Soil samples were regularly collected for analyzing the physical and biochemical properties. The results showed that: (1) With the increasing of slope gradients, the intensity of soil erosion increased. In specific, compared with 5° slope, the annual runoff on 10 ° and 20 ° slopes increased by 30%~115% and 48%~207%, respectively, meanwhile, the annual sediment yield on the 10° and 20° slopes increased by 146%~505% and 241%~742%, respectively. (2) The concentrations of soil organic carbon, dissolved organic carbon, mineral nitrogen, soil microbial biomass carbon and nitrogen and the clay content in the deposition sites were all significantly higher than those in erosion sites. However, the relative abundance of δ13C was 2.0%~3.3% higher in the erosion sites than that in the deposition sites. (3) The difference of soil properties between erosion site and deposition site increased with the increasing of slope gradients. Our results suggested that soil physical and chemical properties had opposite responses to soil erosion and deposition.
查看全文   查看/发表评论  下载PDF阅读器
关闭