ZHAI Jiaying,LI Yuanze,SONG Yahui,et al.Comparative Analysis of Water Soluble Carbon and Nitrogen in Rhizosphere and Non Rhizosphere Soils of Different Slope Aspects in Loess Hilly Region[J].Research of Soil and Water Conservation,2019,26(06):32-37.
黄土丘陵区不同坡向土壤水溶性有机物特征及其根际效应
- Title:
- Comparative Analysis of Water Soluble Carbon and Nitrogen in Rhizosphere and Non Rhizosphere Soils of Different Slope Aspects in Loess Hilly Region
- 分类号:
- S153
- 摘要:
- 为研究不同坡向对土壤水溶性有机物影响及其根际效应，选取黄土丘陵区不同坡向（阳坡、半阳坡、阴坡）的根际土和非根际土壤为研究对象，分析了水溶性总氮（WSN）、水溶性铵态氮（WSNH4+-N和硝态氮（WSNO3--N）、水溶性有机氮（WSON）、水溶性有机碳（WSOC）的含量及其水溶性有机物（DOM）并进行了紫外-可见光光谱分析。结果表明：（1）土壤的水溶性碳、氮养分均会受到坡向的影响，其中WSNH4+-N的含量在阳坡达到最高，而WSN，WSNO3--N、WSON以及WSOC的含量在半阳坡最高，并且养分含量尤其是WSON和WSOC的坡向分异会受植物根际效应的影响产生变化。（2）根际土的水溶性氮组分和WSOC均会显著高于非根际土，不同物种的根际效应不同，且根际效应也会受到坡向的影响。（3）半阳坡土壤的DOM腐殖化水平最高，植物的根际效应也会显著提高土壤DOM的腐殖化程度，并且根际效应产生的作用远大于坡向的作用。
- Abstract:
- In order to study the effect of different slope directions on soil water-soluble organic matter and its rhizosphere effect, the rhizosphere soil and non-rhizosphere soil of different slope directions (sunny slope, semi-sunny slope, shady slope) in loess hilly region were selected as research samples. The water soluble ammonium nitrogen (WSNH4+-N), nitrate nitrogen (WSNO3--N), water soluble organic nitrogen (WSON) and water dissolved organic carbon (WSOC) the content of total nitrogen (WSN) were determined, and water soluble organic matter (DOM) was analyzed by ultraviolet visible spectrum. The Results show that:(1) the water soluble carbon and nitrogen of soil were all affected by slope direction; the content of WSNH4+-N reached the highest in sunny slope, while the contents of WSN, WSNO3--N, WSON and WSOC were the highest in semi-sunny slope, and the nutrient contents, especially the slope differentiation of WSON and WSOC, were affected by the rhizosphere effect; (2) the water-soluble nitrogen components and WSOC in rhizosphere soil were significantly higher than those in non-rhizosphere soil; the rhizosphere effects of different species were different and the rhizosphere effects were also affected by slope directions; (3) the level of DOM humification in semi-sunny slope soil was the highest, and the rhizosphere effect of plant could significantly increase the degree of soil DOM humification, and the effect of rhizosphere effect was much greater than that of slope direction.
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备注/Memo
收稿日期:2018-11-04;改回日期:2019-02-20。
基金项目:十三五国家重点研发计划（2016YFC0501707）；国家自然科学基金（41771557）；中科院西部青年学者项目（XAB2015A05）
作者简介:翟珈莹(1996-),女,内蒙古赤峰人,硕士,研究方向为流域生态学。E-mail:825048035@qq.com
通讯作者:薛萐(1978-),男,陕西西安人,博士,研究员,博士生导师,主要从事土壤生态学研究。E-mail:xuesha100@163.com