高寒草原土壤交换性盐基离子对氮添加的响应: 以紫花针茅草原为例
秦书琪1,2,房凯1,2,王冠钦1,2,彭云峰1,张典业1,2,李飞1,2,周国英3,杨元合1,2,*(
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Responses of exchangeable base cations to continuously increasing nitrogen addition in alpine steppe: A case study of Stipa purpurea steppe
QIN Shu-Qi1,2,FANG Kai1,2,WANG Guan-Qin1,2,PENG Yun-Feng1,ZHANG Dian-Ye1,2,LI Fei1,2,ZHOU Guo-Ying3,YANG Yuan-He1,2,*()
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图4. 不同年份土壤交换性Mg2+与地上生物量以及土壤总无机氮含量的关系。A, 2014年AGB。B, 2014年TIN。C, 2015年AGB。D, 2015年TIN。E, 2016年AGB。F, 2016年TIN。AGB, 地上生物量, TIN, 土壤总无机氮。直线与阴影部分分别表示拟合曲线与95%置信区间。
Fig. 4. Relationships of soil exchangeable Mg2+ with above-ground biomass and soil total inorganic nitrogen in different years. A, AGB in 2014. B, TIN in 2014. C, AGB in 2015. D, TIN in 2015. E, AGB in 2016. F, TIN in 2016. AGB, above-ground biomass, TIN, soil total inorganic nitrogen. The black lines represent the fitted curves and shades for 95% confidence intervals.
