土壤氮磷添加下豆科草本植物生物固氮与磷获取策略的权衡机制

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李强(

), 黄迎新, 周道玮, 丛山

Mechanism of the trade-off between biological nitrogen fixation and phosphorus acquisition strategies of herbaceous legumes under nitrogen and phosphorus addition

LI Qiang(

), HUANG Ying-Xin, ZHOU Dao-Wei, CONG Shan

图2. 氮、磷添加及其交互作用对不同豆科草本植物氮含量(A)、磷含量(B)和氮磷比(C)(平均值±标准误)的影响。Control, 无养分添加; N, 氮添加; P, 磷添加; NP, 氮磷耦合添加; S, 物种。GS, 野大豆; LC, 百脉根; LD, 兴安胡枝子; MF, 黄花苜蓿; MO, 草木樨; MR, 花苜蓿; MS, 紫花苜蓿; MV, 杂花苜蓿。星号表示经一般线性模型统计分析得因子效应具有显著性。***, p < 0.001; **, p < 0.01; *, p < 0.05。

Fig. 2. Influence of nitrogen (N) and phosphorus (P) addition and their interaction on plant N concentration (A), plant P concentration (B) and plant N:P ratio (C)(mean ± SE) of different herbaceous legumes. Control, no nutrient addition; N, N addition; P, P addition; NP, coupled addition of N and P; S, species. GS, Glycine soja; LC, Lotus corniculatus; LD, Lespedeza daurica; MF, Medicago falcata; MO, Melilotus officinalis; MR, Medicago ruthenica; MS, Medicago sativa; MV, Medicago varia. Asterisks indicate that factor effect was significant by general linear model analysis. ***, p < 0.001; **, p < 0.01; *, p < 0.05.