Table 2 Major species of plant functional groups within the quadrats (0.5 m×2 m) in control across 2009–2013

Functional groups	Scientific name	Family	Height (cm)	Relative aboveground productivity in community (%)	Frequency	Frequency rank (from low to large) ^∗
Dominant	Stipa grandis	Gramineae	69.05	35.60	1.00	E
	Leymus chinensis	Gramineae	45.70	25.22	0.87	E
Subdominant	Achnatherum sibiricum	Gramineae	58.82	16.49	0.90	E
	Agropyon cristatum	Gramineae	42.61	11.64	0.88	E
	Carex korshinskyi	Cyperaceae	20.37	4.55	0.97	E
	Cleistogenes squarrosa	Gramineae	19.21	3.29	0.69	D
	Koeleria cristata	Gramineae	22.13	1.01	0.44	C
Rare	Poa subfastigiata	Gramineae	56.19	0.65	0.23	B
	Festuca dahurica	Gramineae	32.88	0.12	0.06	A
	Allium tenuissimum	Liliaceae	23.50	0.40	0.40	C
	Iris tenuifolia	Iridaceae	19.56	0.10	0.07	A
	Allium bidentatum	Liliaceae	20.75	0.06	0.07	A
	Allium ramosum	Liliaceae	17.50	0.06	0.13	A
	Thalictrum petaloideum	Ranunculaceae	37.75	0.04	0.02	A
	Potentilla bifurca	Rosaceae	22.80	0.03	0.05	A
	Chenopodium glaucum	Chenopodiaceae	36.60	0.25	0.23	B
	Axyria amaranthoides	Chenopodiaceae	8.00	0.13	0.14	A
	Salsola collina	Chenopodiaceae	14.00	0.12	0.13	A
	Artemisia scoparia	Compositae	40.00	0.05	0.05	A
	Saussurea japonica	Compositae	11.67	0.05	0.02	A
	Dontostemon micranthus	Cruciferae	14.00	0.04	0.04	A
	Chenopodium aristatum	Chenopodiaceae	9.05	0.01	0.07	A

^∗Species frequency rank classification: A, 0.01–0.20, B, 0.21–0.40, C, 0.41–0.60, D, 0.61–0.80 and E, 0.81–1.00, respectively.

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