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Fig. 6 | BMC Plant Biology

Fig. 6

From: Effects of N and P enrichment on plant photosynthetic traits in alpine steppe of the Qinghai-Tibetan Plateau

Fig. 6

Principal component analysis (PCA) of plant and soil variables. The smaller angle between two variable arrows indicates stronger correlation, as the cosine of the angle between variable arrows equals their correlation coefficients. The length of vector arrows indicate weight of the variables. A: net photosynthetic rate, Gs: stomatal conductance, Ci: intercellular CO2 concentration, Tr: transpiration rate, WUE: water use efficiency.CK: control, N: N fertilization, P: P fertilization, NP: N plus P fertilization. Soil AP: Soil available phosphorus, Soil AK: Soil available potassium, Soil NH4+-N: Soil ammonium nitrogen, Soil NO3−-N: Soil nitrate nitrogen

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BMC Plant Biology

ISSN: 1471-2229

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