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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嘎玛达尔基¹^,², 杨泽¹^,², 谭星儒¹^,², 王珊珊¹^,², 李伟晶¹^,², 游翠海¹^,², 王彦兵¹^,², 张兵伟¹^,³, 任婷婷¹^,², 陈世苹¹^,²^,^*(

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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

GAMADAERJI ¹^,², YANG Ze¹^,², TAN Xing-Ru¹^,², WANG Shan-Shan¹^,², LI Wei-Jing¹^,², YOU Cui-Hai¹^,², WANG Yan-Bing¹^,², ZHANG Bing-Wei¹^,³, REN Ting-Ting¹^,², CHEN Shi-Ping¹^,²^,^*(

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图4. 2013-2018年不同凋落物输入变化和氮添加处理下, 各功能群地上净初级生产力(ANPP)年际变异(A、C、E、G、I)和6年平均值(B、D、F、H、J)。图中数据均为平均值±标准误差。图中给出了每个年份以及多年平均凋落物输入变化(C)氮添加(N)及其交互作用(C × N)对各功能群地上净初级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)。不同大写字母表示不同氮添加处理(N)对各功能群地上净初级生产力影响的多重比较结果差异显著(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。AB, 一二年生植物; PB, 多年生丛生禾草; PF, 多年生杂类草; PR, 多年生根茎禾草; SS, 灌木与半灌木。

Fig. 4. Inter-annual variations (A, C, E, G, I) and 6-year average (B, D, F, H, J) of aboveground net primary productivity (ANPP) of five functional groups in different litter input and nitrogen addition treatments during 2013-2018. The data in the figure are 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 ANPP of each functional group (ns, p > 0.1; #, p < 0.1; *, p < 0.05; **, p < 0.01; ***, p < 0.001). C0, litter removal; C1, control; C2, litter addition; N0, without nitrogen addition; N1, nitrogen addition. Different uppercase letters in the bar graph indicate significant difference of multiple comparisons between two nitrogen addition treatments. AB, annual and biannual plants; PB, perennial bunch grasses; PF, perennial forbs; PR, perennial rhizome grasses; SS, shrubs and semi-shrubs.