氮水添加对油蒿群落2种优势植物叶片氮磷化学计量比的影响

doi:10.11707/j.1001-7488.20200502

Abstract

Abstract:

Objective: A three-year (2015-2017) nitrogen and water addition control experiment was conducted in the southwestern margin of the Mu Us sandy land to investigate the effects and action pathways of increased nitrogen and moisture on the two dominant plant species (Artemisia ordosica and Leymus secalinus).This study was aimed to provide theoretical basis and case support for predicting nutrient cycling in desert ecosystems and nutrient limiting conditions for plant growth under future global environmental changes. Methods: For three successive years (2015-2017), a field control experiments with 2 factors and 9 interactive treatments were conducted in Ningxia Yanchi, Southwestern edge of Mu Us sandy land. Three nitrogen addition levels were N0(0 kg·hm^-2a^-1), N10(10 kg·hm^-2a^-1), and N60(60 kg·hm^-2a^-1). Three water addition levels were W0(natural precipitation), W20(20% increase over natural precipitation), and W40(40% increase over natural precipitation). We performed two-way ANOVAs to examine the responses of soil moisture, soil inorganic nitrogen and soil available phosphorus, soil Ca²⁺ content, and the leaf N:P of A. ordosica and L. secalinus to nitrogen and water addition. Then we used structural equation modeling to test their relationships. Results: Nitrogen addition significantly increased soil inorganic nitrogen and the leaf N:P of A. ordosica and L. secalinus, while no significant effects on soil available phosphorus and soil Ca²⁺ content were detected. Water addition decreased the leaf N:P of L. secalinus and soil Ca²⁺ content, but had no significant effect on soil inorganic nitrogen, soil available phosphorus, and the leaf N:P of A. ordosica. Conclusion: Nitrogen addition relieved the N limitation, but exacerbated P limitation. Water addition reduced the leaf N:P by changing soil (0-20 cm) Ca²⁺ content, therefore P limitation has been alleviated to some extents.

Key words: nitrogen deposition, water addition, N:P, P limitation

CLC Number:

S718.43

Jie Fu,Weiwei She,Yuxuan Bai,Yuqing Zhang,Yangui Qiao,Shugao Qin. Effects of Nitrogen and Water Addition on Leaf N:P Stoichiometry of the Two Dominant Species in Artemisia ordosica Community[J]. Scientia Silvae Sinicae, 2020, 56(5): 12-18.

Figures/Tables 6

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Effects of Nitrogen and Water Addition on Leaf N:P Stoichiometry of the Two Dominant Species in Artemisia ordosica Community

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