生态学杂志2017，Vol.36Issue(12)：3493-3500,8.DOI:10.13292/j.1000-4890.201712.003
不同灌溉模式蔗田土壤呼吸动态
Soil respiration dynamics in sugarcane cropland under different irrigation modes
摘要
Abstract
In order to investigate the effects of different irrigation modes on soil respiration in cropland of sugarcane cultivar Liucheng 05-136,five types of irrigation,including subsurface drip irrigation (SSDI),surface drip irrigation (SDI),pipe irrigation (PI),sprinkler irrigation (SI),and micro-sprinkler irrigation (MSI),were employed.Field measurements of soil respiration rate and related environmental factors (soil temperature and soil water content) were conducted at five growth phases (tillering;early,peak,and late elongation;and maturity) at the Sugarcane Efficient Water-saving Irrigation Test Base in Chongzuo City of Guangxi from March to December in 2015.Soil respiration rates in different treatments showed similar seasonal variability.Seasonal mean soil respiration rate was lowest in the MSI mode (2.59 μmol · m-2 · s-1) and highest in the PI mode (4.50 μmol · m-2 · s-1).Soil respiration in the PI mode was 61.59％,27.61％,15.97％ and 12.33％ higher than that in the MSI,SSDI,SDI and SI modes,respectively (P＜0.01),which indicated that PI irrigation can enhance sugarcane soil respiration rate.The relationship between soil respiration and soil temperature was well explained by exponential functions.Correlations between respiration and temperature were highly significant (P＜0.01) under SSDI,SDI,PI and SI modes,and significant under the MSI mode (P＜0.05).While the relationship between soil respiration and soil water content could be described with a quadratic function,the correlation was significant only under the PI mode (P＜0.05).In comparison to single-factor equation,two-factor equations better predicted soil respiration rate,with coefficients being highly significant (P ＜ 0.01,R2 =0.41-0.83).The temperature sensitivity coefficient (Q10) of soil respiration was 1.98-2.50.Pipe irrigation was the most temperature sensitive mode,while the least sensitive was the SI mode.These findings provide reference for more comprehensive evaluation of the ecological and environment effects of sugarcane water-saving irrigation practices,for accurately assessing the carbon source/sink features of sugarcane cropland ecosystems.关键词
节水灌溉/甘蔗/土壤呼吸/土壤温度/土壤水分Key words
water-saving irrigation/sugarcane/soil respiration/soil temperature/soil moisture引用本文复制引用
谭娟..不同灌溉模式蔗田土壤呼吸动态[J].生态学杂志,2017,36(12):3493-3500,8.基金项目
水利部公益性行业科研专项经费项目(201301013)和广西自治区农业科技成果转化资金项目(14125004-4)资助. （201301013）
