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赵路红,李昌珍,康 迪,任成杰,韩新辉,佟小刚,冯永忠.黄土丘陵区退耕地土壤可溶性氮组分季节变化与水热关系.生态学报,2018,(2).http://dx.doi.org/10.5846/stxb201701110088  
黄土丘陵区退耕地土壤可溶性氮组分季节变化与水热关系
Dynamic change in soil soluble nitrogen under farmland converted to forest in the Loess Hilly Region
投稿时间:2017-01-11  修订日期:2017-08-23
DOI: 10.5846/stxb201701110088
关键词退耕地  可溶性有机氮  季节动态  水热变化
Key Wordsvegetation restoration  soluble organic nitrogen  dynamic change  soil moisture and temperature
基金项目国家自然科学青年基金项目(41301601);陕西省科技统筹创新工程项目(2015KTCL02-07);国家自然科学基金项目(41571501)
作者单位E-mail
赵路红 西北农林科技大学林学院;陕西省循环农业工程技术研究中心 zhaoluhong91@126.com 
李昌珍 西北农林科技大学农学院;陕西省循环农业工程技术研究中心  
康 迪 西北农林科技大学林学院;陕西省循环农业工程技术研究中心  
任成杰 西北农林科技大学农学院;陕西省循环农业工程技术研究中心  
韩新辉 西北农林科技大学农学院;陕西省循环农业工程技术研究中心  
佟小刚 西北农林科技大学资源环境学院  
冯永忠 西北农林科技大学农学院;陕西省循环农业工程技术研究中心 Fengyz@nwsuaf.edu.cn 
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摘要:
摘要:为探究黄土丘陵区退耕地植被恢复土壤有效氮素养分累积的季节动态变化特征及水热驱动效应,本研究以邻近坡耕地为对照,分析了植被恢复15 a的刺槐、柠条、荒草地土壤可溶性氮组分密度、分布比例在4—10月份内的动态变化状况及其与土壤温度和含水量间的关系。结果表明,整个采样期间,0—30 cm土层土壤硝态氮、可溶性有机氮和可溶性全氮动态变化显著,且各可溶性氮组分中仅硝态氮随土层变化差异显著。其中土壤硝态氮变化幅度整体为0.13—1.71 g/m2,占可溶性全氮的5.1%—52.1%,其最大值出现在4月份,最小值出现在10月份;可溶性有机氮整体变化幅度为0.29—2.92 g/m2,占可溶性全氮的30.9%—85.3%,在4月份和8月份分别达最小值和最大值;铵态氮动态变化不显著,10—4月份整体变化幅度为0.17—0.74 g/m2,占6.4%—21.4%,其最小值出现在10月份,最大值出现在4月份;可溶性全氮整体变化幅度为1.25—3.52 g/m2。可溶性氮组分中,各组分所占比例为可溶性有机氮>硝态氮>铵态氮,并且可溶性有机氮与硝态氮所占比例动态变化趋势相反。刺槐、柠条林和荒草地0—30 cm土壤硝态氮平均约为耕地的3.42倍、2.54倍和1.26倍,铵态氮平均为耕地的1.71倍、1.37倍和1.30倍,可溶性有机氮约为1.64倍、1.31倍和1.23倍。可溶性氮组分受土壤含水量的影响大于土壤温度,硝态氮对土壤含水量的变化最为敏感,而可溶性全氮则对土壤温度变化最为敏感。综上所述,人工林植被恢复有利于提高土壤可溶性氮组分,增加氮的有效性,同时除铵态氮外,土壤可溶性氮组分随季节变化显著。
Abstract:
Abstract: Soil soluble and available nitrogen are considered to be limiting nutritional factors for the productivity of plants in terrestrial ecosystems. Land-use change has a significant impact on the physical and chemical properties of soil, particularly nitrogen pools. Furthermore, although the amounts of soil soluble nitrogen are generally very small, they can change rapidly during the plant growing season. However, the changes in soil soluble nitrogen dynamics associated with different vegetation restoration patterns are still poorly understood. Therefore, more information is essential to gain a better understanding of the changes in ecosystems dynamics that occur following the conversion of farmland to forest in the Loess Hilly Region. We studied the dynamic changes in soil soluble nitrogen from April to October, and their relation to soil moisture and temperature under three converted land types in the Loess Hilly Region[Robiniapseudoacacia(RP), Caraganakorshinskii(CK), and abandoned farmland (AF)], which have undergone conversion from slope farmland (SF) for 15 years. The average densities of nitrate nitrogen (NO3--N), soluble organic nitrogen (SON), and soluble total nitrogen (STN) changed significantly from April to October in the 0–30 cm soil layer (P<0.05), although only NO3--N varied significantly with soil depth (P<0.05). During the sampling period (April to October), the average NO3--N density accounted for 5.1%–52.1% of STN, ranging from 0.13 g/m2 (in April) to 1.71 g/m2 (in October). The average density of SON varied significantly from 0.29 g/m2 (in April) to 2.92 g/m2 (in August), which accounted for 30.9%–85.3% of STN. Although the variation in ammonium nitrogen (NH4 -N) was not significant, it ranged from 0.17 g/m2 (in October) to 0.74 g/m2 (in April) and accounted for 6.4%–21.4% of STN. After long-term vegetation restoration, the average densities of NO3--N in RP, CK, and AF were 3.42, 2.54, and 1.26 times higher, respectively, than that of SF in the 0–30 cm soil layer, whereas those of NH4 -N in RP, CK, and AF were increased by 1.71, 1.37, and 1.30 times, respectively, and those of SON were increased by 1.64, 1.31, and 1.23 times, respectively, compared to SF. Correlation analyses indicated that the dynamic change in soil soluble nitrogen was affected by soil moisture and temperature, and that soluble nitrogen was more sensitive to soil moisture than to temperature. Moreover, NO3--N was more sensitive than SON and STN to soil moisture changes, whereas STN was the most sensitive to soil temperature. Collectively, these findings indicate that converting farm to forest can improve the density of soil soluble nitrogen, and increase the availability of soil nitrogen. It was also observed that the amounts of soil soluble nitrogen change significantly with different seasons.
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