Warming effects on plant biomass allocation and correlations with the soil environment in an alpine meadow,China
Warming effects on plant biomass allocation and correlations with the soil environment in an alpine meadow,China作者机构：Taiyuan Normal University Jinzhong 030619 China Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000 China
出 版 物：《Journal of Arid Land》 (干旱区科学（英文版）)
年 卷 期：2016年第8卷第5期
页 面：773-786页
核心收录：
基 金：funded by the National Natural Science Foundation of China (41501219)
主 题：alpine meadow above ground biomass below ground biomass soil environment warming
摘 要：Alpine meadow ecosystem is fragile and highly sensitive to climate *** understanding of the allocation of above-and below-ground plant biomass and correlations with environmental factors in alpine meadow ecosystem can result in better protection and effective utilization of alpine meadow *** chose an alpine meadow in the Qinghai-Tibetan Plateau of China as the study area and designed experimental warming plots using a randomized block experimental *** used single-tube infrared radiators as warming devices,established the warming treatments,and measured plant above- （AGB） and below-ground biomass （BGB） during the growing seasons （May to September） in 2012 and *** determined the allocation of biomass and the relationship between biomass and soil environment under the warming *** indices including above-ground biomass,below-ground biomass and the ratio of root to shoot （R/S） ,and soil factors including soil moisture and soil temperature at different depths were *** results showed that （1） BGB of the alpine meadow had the most significant allometric correlation with its AGB （y=298.7x~ （0.44） ,P〈0.001） ,but the relationship decreased under warming treatment and the determination coefficient of the functional equation was 0.102 which was less than that of 0.188 of the unwarming treatment （control） ; （2） BGB increased,especially in the deeper soil layers under warming treatment （P〉0.05） .At 0–10 cm soil depth,the percentages of BGB under warming treatment were smaller than those of the control treatment with the decreases being 8.52% and 8.23% in 2012 and 2013,***,the BGB increased 2.13% and 2.06% in 2012 and 2013,respectively,at 10–50 cm soil depths; （3） BGB had significant positive correlations with soil moisture at 100 cm depth and with soil temperature at 20–100 cm depths （P〈0.05） ,but the mean correlation coefficient of soil temperature was 0.354,greater than the 0.245 of soil moisture.R/S ratio had a s
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