期刊文献+

滇池双龙流域不同土地利用方式下土壤侵蚀与土壤养分分异 被引量:15

Effects of Different Land Uses on Soil Erosion and Soil Nutrient Variability in the Shuanglong Catchment of Dianchi Watershed
下载PDF
导出
摘要 在滇池双龙流域选取耕地、撂荒地、草地和林地4种土地利用方式,分别取0~40 cm土壤样品,测定样品中的137Cs比活度及w(TN)、w(TP)、w(TOC),同时根据土壤有机质中δ13C(稳定性碳同位素丰度)的剖面分布特征,分析不同土地利用方式对该流域土壤侵蚀程度、土壤养分分异及有机质来源和变化的影响.结果表明:1耕地、撂荒地、草地和林地土壤的137Cs比活度分别为0.65、0.21、3.92和0.61 Bqkg,土壤侵蚀模数大小表现为耕地>撂荒地>林地>草地.2不同土地利用方式下,土壤剖面w(TOC)、w(TN)和w(TP)的平均值差异显著(P<0.001);w(TOC)表现为草地>林地>耕地>撂荒地,w(TN)表现为草地>耕地>林地>撂荒地,w(TP)表现为耕地>草地>林地>撂荒地;各种土地利用方式土壤剖面养分质量分数均随土壤深度增加呈降低趋势.3耕地、撂荒地、草地和林地土壤的δ13C平均值分别为-22.28‰±1.49‰、-23.29‰±0.24‰、-26.32‰±0.25‰和-25.94‰±0.22‰,推断该区域土壤有机质主要来源于陆生C3植物.土壤剖面δ13C的变幅差异反映了土壤有机质分解程度的强弱,δ13C变化规律表现为耕地>林地>草地>撂荒地.4土壤侵蚀模数越大,w(TOC)和w(TN)越低,草地和林地土壤侵蚀程度较低,土壤养分流失量较小,更有利于土壤质量的改善和流域水环境的保护. In this study,four types of land uses including tillage,abandoned farmland,grassland and forestland in the Shuanglong Catchment of Dianchi Watershed were investigated to determine the effects of land use on soil erosion and nutrients. The^137 Cs activities were determined by a high-resolution HPGe γ-spectrometry system( GWL-120-15,USA). The carbon stable isotopes( δ^13C) were analyzed using a thermo Delta plus XL mass spectrometer( UK). Contents of Total nitrogen( TN),total phosphorus( TP) and total organic carbon( TOC) in the soil samples were measured as well. The results are as follows: 1) The^137 Cs activities in the soil samples from tillage,abandoned farmland,grassland and forestland were 0. 65,0. 21,3. 92 and 0. 61 Bq/kg,respectively. The decreasing order of soil erosion modulus was tillage 〉abandoned farmland 〉forestland 〉grassland. 2) The differences of TOC,TN and TP contents among the four land uses types were of great significance( P〈 0. 001). The comparison of TOC contents was grassland〉 forestland〉 tillage〉 abandoned farmland. The TN contents were grassland〉 tillage〉 forestland abandoned farmland. The TP contents were tillage grassland 〉forestland 〉abandoned farmland. The soil nutrient concentrations in different land use types decreased with depth. 3) The average values of δ^13C in the soil samples from tillage,abandoned farmland,grassland and forestland were - 22. 28‰ ± 1. 49‰,- 23. 29‰ ± 0. 24‰,- 26. 32‰ ± 0. 25‰and- 25. 94‰ ± 0. 22‰,respectively. It was deduced that the organic matter in the Shuanglong catchment was mainly derived from terrigenous C3 plants. The variation ranges of δ^13C values in different soil profiles decreased in the following order: tillage forestland grassland abandoned farmland. 4) The decline in soil quality was associated with soil erosion and decreased soil nutrients. Grassland and forestland would be beneficial for regional environmental protection,because of their low levels of nutrient loss.
出处 《环境科学研究》 EI CAS CSSCI CSCD 北大核心 2014年第9期1043-1050,共8页 Research of Environmental Sciences
基金 国家自然科学基金项目(41273102 41030751 41273103)
关键词 双龙流域 土地利用方式 土壤侵蚀 土壤养分 稳定性碳同位素 Shuanglong catchment land use soil erosion soil nutrient stable carbon isotope
  • 相关文献

参考文献40

  • 1PIMENTEL D. Soil erosion : a food and environmental threat [ J ]. Environment, Development and Sustainability, 2006,8 : 119-137.
  • 2DURAN ZUAZO V H, RODRIGUEZ PLEGUEZUELO C R. Soil- erosion and runoff prevention by plant covers: a review [ J ]. Agronomy for Sustainable Development, 2008,28 (1) :65-86.
  • 3BAKKER M M ,GOVERS G ,VAN DOORN ,et al. The response of soil erosion and sediment export to land-use change in four areas of Europe : the importance of landscape pattern [ J ]. Geomorphology 2008,98(3/4) :213-226.
  • 4DE NEERGAARD A, MAGID J, MERTZ O. Soil erosion from shifting cultivation and other smallholder land use in Sarawak, Malaysia [ J ]. Agriculture Ecosystems & Environment, 2008,125 : 182-190.
  • 5WANG Hongjie, SHI Xuezheng, YU Dongsheng, et al. Factors determining soll nutrient distribution in a small-scaled watershed in the purple soil region of Sichuan Province, China [ J ]. Soil & Tillage Research, 2009,105 ( 2 ) : 300 - 306.
  • 6GARCIA-RUIZ J M. The effects of land rises on soil erosion in Spain:a review[ J]. Catena,2010,81 (1) :1-11.
  • 7MUNODAWAFA A. Assessing nutrient losses with soil erosion under different tillage systems and their implications on water quality[J]. Physics and Chemistry of the Earth, 2001, 32 : 1135- 1140.
  • 8EKHOLM P,LEHTORANTA J. Does control of soil erosion inhibit aquatic eutrophication? [J].J Environ Manage, 2012,93 : 140- 146.
  • 9ELIPE Z. The use of environmental radionuclides as tracers in soil erosion and sedimentation investigations:recent advances and future developments [ J ]. Soil & Tillage Research,2003,69:3-13.
  • 10李俊杰,李勇,王仰麟,吴健生.三江源区东西样带土壤侵蚀的^137Cs和^210Pbex示踪研究[J].环境科学研究,2009,22(12):1452-1459. 被引量:28

二级参考文献238

共引文献282

同被引文献266

引证文献15

二级引证文献99

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部