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2. 氮添加对土壤交换性Ca2+、Mg2+、K+、Na+的影响(平均值±标准误差)。A, Ca2+。B, Mg2+。C, K+。D, Na+。N0-N32, 氮添加量分别为: 0、1、2、4、8、16、24、32 g·m-2·a-1。不同字母表示各施氮量下差异显著(p < 0.05)。
Fig. 2. Effects of nitrogen addition on soil exchangeable Ca2+, Mg2+, K+, Na+ (mean ± SE)。A, Ca2+. B, Mg2+. C, K+. D, Na+. N0-N32, nitrogen addition 0, 1, 2, 4, 8, 16, 24, 32 g·m-2·a-1, respectively. Different letters indicate significant differences among treatments (p < 0.05).
