Variation in Morphological and Physiological Characteristics of Wild Elymus nutans Ecotypes from Different Altitudes in the Northeastern Tibetan Plateau

Table 1

Aboveground, belowground, and total dry matter with root : shoot ratios at flowering and seed yield at 80% maturity for four different populations of E. nutans.

Altitude (m)	Aboveground dry matter (kg hm^-2)	Belowground dry matter (kg hm^-2)	Root : shoot ratio	Total plant weight (kg hm^-2)	Seed yield (kg hm^-2)
2450	^a	^b	0.32 ± 0.04^c	^a	^b
2950	^b	^a	^b	^b	^a
3100	^bc	^a	^ab	^bc	^c
3300	^c	^a	^a	^c	^d