水土保持学报2017，Vol.31Issue(3)：239-243,5.DOI:10.13870/j.cnki.stbcxb.2017.03.040
地膜覆盖对黄土高原旱作春玉米田土壤碳氮组分的影响
Effects of Plastic Film Mulching on Soil Carbon and Nitrogen Fractions in a Dryland Spring Maize Field on the Loess Plateau
摘要
Abstract
The effects of plastic film mulching on soil organic carbon and nitrogen fractions were investigated in a spring maize field.Three treatments,i.e.plastic film mulching,no mulching,and bareland fallow were included and soil organic carbon (SOC),total nitrogen (STN),particulate organic carbon and nitrogen (POC,PON),potential carbon and nitrogen mineralization (PCM,PNM),and microbial biomass carbon and nitrogen (MBC,MBN) were measured at 0-40 cm soil depths.No significant differences in SOC and STN were found among treatments for all soil depths.Compared with no mulching,the contents of POC,PON,POC/SOC,and PON/STN at 0-40 cm soil depth was decreased by 29.0％,33.3％,29.9％,and 35.7％ by plastic film mulching,respectively.The PCM content and PCM/SOC was decreased by 17.8％ and 16.1％,respectively,and the MBN content and MBN/STN at 0-10 cm soil depth was increased by 10.6％ and 10.5％ (p ＜ 0.05),respectively.Compared with the bareland fallow,the content of PCM and PNM at 0-40 cm soil depth was increased by 12.8％ and 14.7％ by no mulching,respectively,and was increased by 7.8％ and 6.5％ (p ＜ 0.05) by plastic film mulching,respectively.The contents of MBC and MBN and their contributions decreased after maize planting in spite of plastic film mulching or not.In general,plastic film mulching could increase microbial biomass nitrogen at the top layers but decrease both the contents and conributions of moderate labile fractions,indicating that plastic film mulching may not be beneficial for long-term soil nitrogen sequestration in dryland maize fields.关键词
地膜覆盖/土壤有机碳/全氮/颗粒有机碳氮/潜在可矿化碳氮/微生物量碳氮Key words
plastic film mulching/soil organic carbon/total nitrogen/particulate organic carbon and nitrogen/potential carbon and nitrogen mineralization/microbial biomass carbon and nitrogen分类
农业科技引用本文复制引用
付鑫,王俊,赵丹丹..地膜覆盖对黄土高原旱作春玉米田土壤碳氮组分的影响[J].水土保持学报,2017,31(3):239-243,5.基金项目
国家自然科学基金项目(31570440,31270484) （31570440,31270484）
西北大学研究生自主创新项目(YZZ13006) （YZZ13006）
