荒漠草原自然和人工植被土壤养分及氮循环功能基因丰度特征研究

doi:10.13866/j.azr.2024.12.05

Abstract

Abstract:

In this study, we examined seven species suited to desert grasslands and analyzed the relationship between soil nutrients and nitrogen cycling in natural and artificial vegetation through field sampling and laboratory analysis. The results showed the following: (1) Salsola collina and Caragana korshinskii howed high nutrient content, which had a fixed effect on nutrients and was conducive to the restoration of nutrient content within the study area. Additionally, these species significantly increased the abundance of bac, AOA, AOB, nirS, nirK, nifH, and nosZ genes in the rhizosphere soil. (2) The abundance of the nifH gene was significantly correlated with soil nutrient levels. (3) The ecological restoration of soil in the study area is influenced by the combined effects of carbon and nitrogen, necessitating adjustments to the fertilization structure and improvements to the soil environment in the future. Overall, natural vegetation, such as Salsola collina, and artificial vegetation, such as Caragana korshinskii, outperformed other species in soil nutrient fixation and nitrogen cycling functional gene abundance, making them ideal for restoration in the study area. These findings provides valuable insights for selecting plant species in future ecological restoration of gravel-sand-mulched fields.

Key words: desert grassland, vegetation restoration, soil physical and chemical properties, nitrogen cycle, functional gene

WEN Miao, MAO Xinping, YANG Jiejun, SUN Jiayi, WU Xudong, HAN Fengpeng. Abundance characteristics of soil nutrients and nitrogen cycle functional genes in the natural and artificial vegetation of desert grasslands[J].Arid Zone Research, 2024, 41(12): 2027-2034.

Figures/Tables 4

Tab. 1

Fig. 1

Fig. 2

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物种	科属	株高	基径	冠幅
猪毛菜Salsola collina	苋科猪毛菜属	35 cm	7 mm	28 cm
芒草Miscanthus sinensis	禾本科芒属	60 cm	8 mm	45 cm
芨芨草Achnatherum splendens	禾本科芨芨草属	1.5 m	5 mm	55 cm
柠条Caragana korshinskii	豆科锦鸡儿属	0.6 m	6 mm	75 cm
枣树Ziziphus jujuba	鼠李科枣属	2.5 m	10 cm	2 m
旱柳Salix matsudana	杨柳科柳属	5 m	20 cm	4 m
胡枝子Lespedeza bicolor	豆科胡枝子属	55 cm	3 cm	40 cm

环境因子	功能基因
环境因子	AOA	nosZ	AOB	bac	nifH	nirK	nirS
根际土壤
有机碳	0.449^*	0.341	-0.248	0.480^*	0.555^**	0.312	0.333
速效磷	0.064	0.067	-0.135	0.180	0.478^*	0.081	0.107
硝态氮	0.186	0.194	-0.091	0.27	0.483^*	0.222	0.222
铵态氮	0.232	0.227	-0.061	0.334	0.484^*	0.255	0.269
非根际土壤
有机碳	0.200	0.137	0.122	0.448^*	-0.468^*	0.045	0.136
速效磷	-0.094	-0.257	-0.242	0.198	-0.411	-0.229	-0.205
硝态氮	-0.298	-0.431^*	-0.386	-0.043	-0.500^*	-0.409^*	-0.411^*
铵态氮	-0.181	-0.307	-0.252	-0.089	-0.599^**	-0.353	-0.288

Abundance characteristics of soil nutrients and nitrogen cycle functional genes in the natural and artificial vegetation of desert grasslands

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