不同深度土壤水分对黄淮海封丘地区小麦的贡献

被引：15

作者：

张丛志 ^{[1
]}

张佳宝 ^{[1
]}

张辉 ^{[2
]}

机构：

[1] 封丘农田生态系统国家试验站土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所)

[2] 不详

来源：

土壤学报 | 2012年 / 49卷 / 04期

基金：

中国科学院知识创新工程重大项目;

关键词：

水源; 冬小麦; 稳定氢同位素; 稳定氧同位素; 耦合模型;

D O I：

暂无

中图分类号：

S512.11 [];

学科分类号：

摘要：

作物水源是土壤—植物—大气连续体(Soil Plant Atmosphere Continuum,SPAC)中水分循环及节水农业的重要研究方面。传统方法很难确定不同水源对作物的贡献。本研究通过封丘地区冬小麦田间试验和稳定性氢氧同位素技术,建立了线性混合模型和δD-δ18O曲线的耦合模型,并采用该耦合模型计算了各水源对各生育期冬小麦的贡献。结果表明:各水源对冬小麦的贡献随着生育期的变化而变化。分蘖、返青和拔节期冬小麦的主要水源为表层土壤水,且对各层土壤水分的利用随着深度的增加而减少;在孕穗期,冬小麦对80 cm处土壤水利用最多;开花期80和180 cm处土壤水是冬小麦的重要水源;乳熟期40和80 cm土壤水分分别贡献了47.5%和39.5%。地下水在孕穗期和开花期对冬小麦的贡献较大,分别为9.0%和16.4%。

引用

页码：655 / 664

页数：10

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