Ecological stoichiometry and biomass responses ofAgropyron michnoiunder simulated N deposition in a sandy grassland, China

文献类型： 外文期刊

第一作者： Jin, Xiaoming

作者： Jin, Xiaoming;Yang, Xiaogang;Zhou, Zhen;Zhang, Jinghua;Zhang, Yingqi;Yu, Liangbin;Liang, Runfang

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关键词： biomass; nitrogen deposition; plant tissue; C; N and P stoichiometry; sandy grassland

期刊名称：JOURNAL OF ARID LAND （ 影响因子：2.299； 五年影响因子：2.459 ）

ISSN： 1674-6767

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收录情况： SCI

摘要： Sandy grassland in northern China is a fragile ecosystem with poor soil fertility. Exploring how plant species regulate growth and nutrient absorption under the background of nitrogen (N) deposition is crucial for the management of the sandy grassland ecosystem. We carried out a field experiment with six N levels in the Hulunbuir Sandy Land of China from 2014 to 2016 and explored theAgropyron michnoiRoshev. responses of both aboveground and belowground biomasses and carbon (C), N and phosphorus (P) concentrations in the plant tissues and soil. With increasing N addition, both aboveground and belowground biomasses and C, N and P concentrations in the plant tissues increased and exhibited a single-peak curve. C:N and C:P ratios of the plant tissues first decreased but then increased, while the trend for the N:P ratio was opposite. The peak values of aboveground biomass, belowground biomass and C concentration in the plant tissues occurred at the level of 20 g N/(m(2)center dot a), while those of the N and P concentrations in the plant tissues occurred at the level of 15 g N/(m(2)center dot a). The maximum growth percentages of aboveground and belowground biomasses were 324.2% and 75.9%, respectively, and the root to shoot ratio (RSR) decreased with the addition of N. N and P concentrations in the plant tissues were ranked in the order of leaves>roots>stems, while C concentration was ranked as roots>leaves>stems. The increase in N concentration in the plant tissues was the largest (from 34% to 162%), followed by the increase in P (from 10% to 33%) and C (from 8% to 24%) concentrations. The aboveground biomass was positively and linearly correlated with leaf C, N and P, and soil C and N concentrations, while the belowground biomass was positively and linearly correlated with leaf N and soil C concentrations. These results showed that the accumulation of N and P in the leaves caused the increase in the aboveground biomass, while the accumulation of leaf N resulted in the increase in the belowground biomass. N deposition can alter the allocation of C, N and P stoichiometry in the plant tissues and has a high potential for increasing plant biomass, which is conducive to the restoration of sandy grassland.

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