Rhizosphere priming effects of soybean and cottonwood: do they vary with latitude?
Rhizosphere priming effects of soybean and cottonwood: do they vary with latitude?
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大豆和三叶杨的根际启动效应：它们随纬度变化吗？
DOI：
10.1007/s11104-017-3396-5
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发表时间：
2017
期刊：
影响因子：
4.9
通讯作者：
Cheng Weixin
中科院分区：
文献类型：
--
作者：
Su Tongqing;Dijkstra Feike A.;Wang Peng;Cheng Weixin
背景与目的生长室内和温室试验的证据表明，根际启动效应（RPE，活根及其根际生物群刺激或抑制土壤有机质分解）可能对温度和光照水平等环境因子敏感。然而，对于不同纬度区域在温度和光照水平变化下RPE的潜在变化知之甚少。方法探讨大豆（Glycine max）和杨木（Populus × euramericana cv）的RPE。’74/76’)，在不同的光照和温度条件下，使用自然13C示踪法在两个生长季节在两个不同的纬度位置。结果不同植物种类在不同季节产生的rpe差异显著。大豆和棉的RPE在植株较小的初始阶段均较小。大豆的RPE值为0.4% ~ 135%，在开花期达到最高，开花期后呈下降趋势。棉杨的RPE在- 17% ~ 121%之间，两个生长季节均有增加的趋势。在两个生长季节和两个地点，大豆的累积RPE均显著高于白杨。总体而言，低纬度地区的累积RPE值大于高纬度地区。低纬度地区大豆的累积RPE是高纬度地区的1.7倍。两种植物的RPE与特定根际呼吸显著相关，与土壤溶解全氮含量负相关。结论两个生长季节不同地点两种植物的RPE不同。特别是大豆，低纬位置的累积RPE高于高纬位置，这可能与光照水平较高有关。研究结果进一步表明，植物种类、季节、根际比呼吸和土壤溶解全氮是控制RPE的重要变量。总的来说，这些结果为在更广泛的上下文中使用RPE数据提供了所需的支持。
Background and aimsEvidence from growth chamber and greenhouse experiments indicates that the rhizosphere priming effect (RPE, stimulation or suppression of soil organic matter (SOM) decomposition by live roots and their rhizospheric biota) may be sensitive to environmental factors such as temperature and level of sunlight. However, little is known about potential variations of the RPE under different latitudinal regions that vary in temperature and sunlight levels.MethodsWe explored the RPE of soybean (Glycine max) and cottonwood (Populus × euramericana cv. ‘74/76’) at two different latitudinal locations under variable conditions of light and temperature for two growing seasons using a natural 13C tracer method.ResultsDifferent plant species at different time of season produced significantly different RPEs. The RPE of both soybean and cottonwood was small at the initial stage when the plants were small. The RPE of soybean ranged from 0.4% to135%, reached the highest level at the flowering stage and declined afterward. The RPE of cottonwood ranged from −17% to 121% and tended to increase in both growing seasons. The cumulative RPE of soybean was significantly higher than that of cottonwood at both locations and during the two growing seasons. Overall the cumulative RPE values were larger at low latitude than at high latitude. The cumulative RPE of soybean at the low latitudinal location was 1.7 times higher than at the high latitudinal location. The RPE of both plant species was significantly related to specific rhizosphere respiration, but negatively related to soil dissolved total nitrogen content.ConclusionsThe RPE of both plant species varied at both locations during the two growing seasons. Particularly for soybean, the cumulative RPE was higher at the low latitudinal location than at the high latitudinal location, possibly because of higher light levels. Our results further indicate that plant species, time of season, specific rhizosphere respiration, and soil dissolved total nitrogen are important variables in controlling the RPE. Overall, these results provide the needed support for using RPE data in a broader context.