Skip to main content
. 2010 Nov 17;107(1):145–155. doi: 10.1093/aob/mcq219

Results of stepwise multiple regression analysis between leaf longevity and other leaf functional traits in five steppe species

Species Regression equations Step no. Variable entered R2 Change in R2 (%) P value
2007
S. krylovii LL = –3·39Pnet + 70·89 1 Pnet 0·805 80·5 <0·001
A. cristatum LL = –1·11LNC – 3·12Pnet + 103·65gs + 86·69 1 LNC 0·779 77·9 <0·001
2 Pnet 0·883 10·4 <0·001
3 gs 0·943 6·0 <0·001
C. squarrosa LL = –0·49LNC + 43·67 1 LNC 0·790 79·0 <0·001
P. tanacetifolia LL = –1·84SPAD + 121·27 1 SPAD 0·713 71·3 <0·001
M. ruthenica LL = –2·63SPAD + 191·18 1 SPAD 0·830 83·0 <0·001
2008
S. krylovii LL = –3·43Pnet + 109·27 1 Pnet 0·683 68·3 <0·001
A. cristatum LL = 1·64C/N – 24·84gs + 0·19DMC – 54·59 1 C/N 0·722 72·2 <0·001
2 gs 0·913 19·1 <0·001
3 DMC 0·955 4·2 <0·001
C. squarrosa LL = –0·74LNC + 0·06DMC + 28·58 1 LNC 0·855 85·5 <0·001
2 DMC 0·927 7·2 <0·001
P. tanacetifolia LL = –1·76SPAD + 0·15DMC + 73·84 1 SPAD 0·701 70·1 <0·001
2 DMC 0·835 13·4 <0·001
M. ruthenica LL = 7·08δ13C – 1·19SPAD + 314·61 1 δ13C 0·564 56·4 <0·01
2 SPAD 0·735 17·1 <0·01

LL, leaf longevity; Pnet, net photosynthetic rate based on area; gs, stomatal conductance; LNC, leaf nitrogen content; SPAD, estimated leaf chlorophyll concentration; C/N ratio, ratio of leaf carbon to nitrogen contents; DMC, leaf dry matter content; δ13C, leaf carbon isotopic composition.