祁连山典型植被土壤碳、氮、磷含量及生态化学计量特征的垂直变化

doi:10.13866/j.azr.2024.03.09

Abstract

Abstract:

Five typical vegetation types (i.e., coniferous forests, meadow grasslands, alpine shrubs, alpine meadows, and sparse vegetations of limestone flat) along a vertical belt of the Qilian Mountains were selected to explore the spatial elevational patterns of soil carbon, nitrogen, and phosphorus and their stoichiometric ratios. Results showed that: (1) The contents of total carbon (C), nitrogen (N), and phosphorus (P) at the 0-40 cm depth were 15.33-83.46, 1.63-7.76, and 0.41-0.66 mg·kg^-1, respectively. Soil C and N decreased gradually with increasing altitudes, following the order coniferous forests>meadow steppes>alpine shrubs>alpine meadows>sparse vegetations of limestone flat. Soil P in alpine scrubs was significantly higher than that in alpine meadows, but the other three vegetations showed no significant difference. (2) The contents of $\mathrm{NH}_{4}^{+}-\mathrm{N}$, $\mathrm{NO}_{3}^{-}-\mathrm{N}$ and available phosphorus at the 0-40 cm depth were 11.01-14.73, 2.78-12.46, and 4.35-13.57 mg·kg^-1, respectively. Ammonium was the main inorganic nitrogen form in all vegetation types. The nitrite content decreased gradually with increasing altitude. The content of soil available phosphorus was higher in sparse vegetations of limestone flats. (3) The ratios of soil C:N, C:P, and N:P at the 0-40 cm depth were 9.52-10.11, 29.89-320.24, and 3.18-29.63, respectively. Soil C:N decreased with elevation. Soil C:P and N:P were significantly lower in the soil of sparse vegetations of the limestone flat than in other vegetations, indicating that carbon and nitrogen were the limiting nutrients in the limestone flat. By contrast, the limestone flat was in a phosphorus-rich state. Elevational variations in soil C, N, and P contents and their stoichiometric ratios reflect the joint control of multiple environmental factors, thereby affecting the biochemical processes of soil C, N, and P.

Key words: vegetation type, elevations, soil physicochemical properties, eco-stoichiometry, Qilian Mountains

BAI Lili, WANG Wenying, Dequelamu , LIU Yanfang, DENG Yanfang. Elevational variations in ecological soil C, N, and P stoichiometry among five typical vegetation types in the Qilian Mountains[J].Arid Zone Research, 2024, 41(3): 444-455.

Figures/Tables 7

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References 37

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植被类型（土壤类型）	地理位置	海拔/m	植被盖度/%	优势种
针叶林（山地灰褐土）	37°17′25″N， 101°57′29″E	2700	80	青海云杉+早熟禾 Picea crassifolia+Poa annua
草甸化草原（亚高山草甸土）	37°37′42″N， 101°24′11″E	3278	95	珠芽蓼+鹅绒委陵菜+高山嵩草 Bistorta vivipara+Potentilla anserina+Kobresia pygmaea
高寒灌丛（高山灌丛草土）	37°39′17″N， 101°25′38″E	3555	95	金露梅+鬼箭锦鸡儿+矮嵩草 Potentilla fruticosa+Caragana jubata+Kobresia humilis
高寒草甸（高山草甸土）	37°40′19″N， 101°26′13″E	3720	70	高山嵩草+早熟禾 Kobresia pygmaea+Poa annua
流石滩稀疏植被（高山寒漠土）	37°41′30″N， 101°27′06″E	4043	40	胎生鳞茎早熟禾+高山嵩草+囊肿草Poa bulbosa L. var. vivipara Koeler+Kobresia pygmaea+Thylacospermum caespitosum

Elevational variations in ecological soil C, N, and P stoichiometry among five typical vegetation types in the Qilian Mountains

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