凋落物输入变化和氮添加对半干旱草原群落生产力及功能群组成的影响
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Effect of altered litter input and nitrogen addition on ecosystem aboveground primary productivity and plant functional group composition in a semiarid grassland
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图2. 2013-2018年不同凋落物输入变化和氮添加处理下, 表层(0-10 cm)土壤温度(Ts)、土壤含水量(SWC)和土壤可溶性有机碳氮(DOC和DON)含量的年际变异(A、C、E、G)和6年平均值(B、D、F、H)(平均值±标准误差)。图中给出了凋落物输入变化(C)和氮添加(N)对生产力影响的差异显著性分析结果(ns, p > 0.1; #, p < 0.1; *, p < 0.05; **, p < 0.01; ***, p < 0.001)。柱状图中的字母表示不同凋落物输入变化和氮添加处理间各指标的多重比较结果, 不同小写字母表示不同凋落物输入变化处理间的差异显著(p < 0.05), 不同大写字母代表不同氮添加处理间的差异显著(p < 0.05)。C0, 凋落物去除; C1, 凋落物对照; C2, 凋落物添加; N0, 无氮添加; N1, 氮添加。 |
Fig. 2. Inter-annual variations (A, C, E, G) and the 6-year average (B, D, F, H) of soil temperature (Ts), soil water content (SWC), dissolved organic carbon (DOC) and nitrogen (DON) content in surface soil layer (0-10 cm) in different litter input and nitrogen addition treatments during 2013-2018 (mean ± SE). Significance levels were presented to show the effects of altered litter input (C) and nitrogen addition (N) treatments and their interaction (C × N) on these parameters (ns, p > 0. 1; #, p < 0.1; *, p < 0.05; **, p < 0.01; ***, p < 0.001). The letters in the bar graph indicate the results of multiple comparisons among different litter input and nitrogen addition treatments. Different lowercase letters indicate significant difference among three altered litter input treatments (p < 0.05), and uppercase letters indicate the significant difference between two nitrogen treatments (p < 0.05). C0, litter removal; C1, control; C2, litter addition; N0, without nitrogen addition; N1, nitrogen addition. |
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