北京林业大学学报2017，Vol.39Issue(12)：52-60,9.DOI:10.13332/j.1000-1522.20170241
小兴安岭地区典型红松林下不同形态土壤氮的动态变化
Dynamic changes of multi-form nitrogen in typical Pinus koraiensis forest of Xiaoxing' an Mountains of northeastern China
摘要
Abstract
Nitrogen( N ) is the nutrient regulating net plant primary production in most ecosystems, and N nutrient plays a significant role in N cycling. This study selects typical forest types in Xiaoxing ' an Mountains of northeastern China in 2016 , namely Pinus koraiensis plantation and pristine broadleaved Pinus koraiensis forest, and sampled continuously in 0--5 cm,5--15 cm and 15--30 cm soil horizons for five months, measuring the contents of free amino acids-, nitrate-, ammonium-N and soluble organic N in the three soil horizons, and moisture content, pH, organic carbon, total N, microbial carbon and N levels in the 0--5 cm soil horizon. By exploring and discussing the dynamics of multi-form N and by incorporating some soil biochemical factors we measured, this study aims to discover the pool size of multi-form N and seasonal dynamics of available N in typical forests of Xiaoxing' an Mountains, with principal component analysis ( PCA) analyzing the underlying driver factors of N seasonal dynamics. The final results showed that the composition of amino acids was similar in the two Pinus koraiensis forests of Xiaoxing ' an Mountains, with aspartic acid, serine, glycine, histidine, arginine and leucine owning higher contents, but dominant amino acids varied in different months. The three forms of available N pool size followed ammonium>nitrate>free amino acids, and amino acids-N comprised a significant part of soil soluble N pool. The content of multi-form N decreased with soil depth in 0--30 cm soil horizon, with consistent relationship with time. With the temperature and hydrologic circumstances as drivers, free-thaw event, microbial factor, pH and complex biochemical processes changed over time leading to soil available N dynamics; as the variation in potential physical, chemical and biological factors and their combined effects in soils, however, tendency in available N dynamics appeared to be different.关键词
氮/氨基酸/生产与消耗/主成分分析/动态变化Key words
nitrogen/amino acid/production and consumption/principal component analysis/dynamic change分类
农业科技引用本文复制引用
高雷,崔晓阳,郭亚芬,徐嘉晖..小兴安岭地区典型红松林下不同形态土壤氮的动态变化[J].北京林业大学学报,2017,39(12):52-60,9.基金项目
国家自然科学基金项目(31370617). （31370617）
