3.2 Reproductive traits changed under the N and P addition
treatments
Seed number per inflorescence and inflorescence number were
significantly influenced by N addition (both P <
0.001), whereas P addition significantly affected seed number per
inflorescence (P < 0.05) but not inflorescence number
(P > 0.05; Figure 2, Table 1). The low N addition
stimulated seed number per inflorescence by 120%, 145%, and 175%
under ambient, low, and high P addition conditions, respectively (allP < 0.05; Figure 2a left insert, Table 1). The high N
addition increased seed number per inflorescence by 183%, 187%, and
247% under the ambient, low, and high P addition treatments,
respectively (all P < 0.05). Although the low P
addition did not affect seed number per inflorescence under ambient,
low, or high N addition conditions (all P > 0.05).
However, high P addition enhanced seed number per inflorescence by 29%
under the low N, and 27% under the high N addition treatments (bothP < 0.05), but not under ambient N (P> 0.05; Figure 2a right insert).
The low N addition increased the inflorescence number by 317%, 513%,
and 396% under the ambient, low, and high P addition treatments,
respectively (all P < 0.05), but this effect was
stronger under high N addition with corresponding increases of 719%,
1187%, and 934% under ambient, low, and high P addition conditions,
respectively (all P < 0.05; Figure 2b left insert).
However, either a low or high P addition did not influence inflorescence
number under the ambient or low N addition treatments (all P> 0.05; Figure 2b right insert). Yet the low P addition was
able to significantly augment inflorescence number by 49% under the
high N addition treatment (Figure 2b right insert; P <
0.05).