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荒漠草原4种优势植物叶片化学计量内稳性特征

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探讨植物生态化学计量内稳性特征对了解草原植物的生长适应策略具有重要意义。以内蒙古鄂克托前旗荒漠草原牛枝子(Lespedeza potaninii)、苦豆子(Sophora alopecuroides)、短花针茅(Stipa breviflora)和猪毛蒿(Artemisia scoparia)4种优势植物为研究对象，研究植物叶片氮、磷内稳性特征及其影响因素。结果表明:苦豆子叶片N、N∶P含量显著高于其他3种优势植物(P<0。05)，猪毛蒿叶片P含量显著高于其他3种优势植物;N元素内稳性指数(HN)以牛枝子最高，属于稳态型;P元素内稳性指数(HP)以猪毛蒿最高，属于稳态型;N:P内稳性指数(HN:P)以牛枝子最高，属于弱稳态型。冗余分析结果显示，土壤全碳和全氮含量对化学计量内稳性变异解释率分别为56。9％和9。9％，均达到显著水平(P<0。05)，但其他土壤理化因子对其无显著影响(P>0。05)。综上所述，在氮含量较低的荒漠草原，多年生植物N内稳性和N∶P内稳性较高，采用保守养分策略，其中N内稳性较高的灌木牛枝子适应性更强;一年生植物P内稳性较高，N:P内稳性比较低，采用奢侈分配策略;影响化学计量内稳性主要因子为土壤全碳和全氮含量。
Nitrogen and phosphorus stoichiometric homoeostasis characteristics of four dominant plants in a desert steppe
Exploring the characteristics of plant stoichiometric homoeostasis is important to further understand the growth adaptation strategies of grassland plants. This study selected four dominant plants (Lespedeza potaninii,Sophora alopecuroides,Stipa breviflora,and Artemisia scoparia) in the desert steppe of Etuokeqianqi in Inner Mongolia as the research objects. The results indicated that:The contents of N and N∶P in leaves of A. scoparia were significantly different from those of the other three dominant plants. The content of P in leaves of A. Artemisia was also significantly different from those of the other three dominant plants (P<0.05). The N homeostasis index (HN) of L. potaninii was the highest among the four dominant plants,belonging to homeostasis. The P homeostasis index (HP) of A. scoparia was the highest among the four dominant plants,implying homeostasis. The N∶P homeostasis index (HN∶P) of L. potaninii was also the highest among the four dominant plants,belonging to weak homeostasis. The results of RDA analysis showed that the explanation rates of soil total carbon and total nitrogen contents to the stoichiometric homoeostasis were 56.9％ and 9.9％,respectively,reaching significant levels (P<0.05);the effects of the other soil physical and chemical factors were relatively weak. In conclusion,the endogenous stability of N and N∶P of perennial plants were higher in the desert steppe with low nitrogen content,and perennial plants adopted conservative nutrient strategies. The shrub L. potaninii showed higher endogenous stability of N and better adaptation. The P internal stability of annual plants was higher but the N∶P internal stability was lower,and adopted the luxury allocation strategy. The main factors of stoichiometric homoeostasis were soil total carbon and total nitrogen contents.

desert steppedominant plantleaf stoichiometric homoeostasisannual and perennial plantsleaf nitrogen and phosphorus contentsoil physicochemical factors

霍新茹、沈艳、马红彬、王国会、陆颖、洪乐乐、张小菊、胡艳、马登宝、李东

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宁夏大学林业与草业学院,宁夏银川 750021

宁夏大学农业农村部饲草高效生产模式创新重点实验室,宁夏银川 750021

宁夏大学宁夏回族自治区草牧业工程技术研究中心,宁夏银川 750021

宁夏大学西北土地退化与生态恢复省部共建国家重点实验室培育基地,宁夏银川 750021

宁夏吴忠市红寺堡区林业与草原局,宁夏吴忠 751999

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荒漠草原 优势植物 叶片化学计量内稳性 一年生和多年生植物 叶片氮磷含量 土壤理化因子

中科院"西部之光"青年学者项目(2021)宁夏大学红寺堡校地共建项目(2022)宁夏高等学校一流学科建设(草学)

NXYLXK2017A01

2024

10.11829/j.issn.1001-0629.2023-0356

草业科学
中国草原学会 兰州大学草地农业科技学院

草业科学

CSTPCD北大核心
影响因子：0.854
ISSN：1001-0629
年,卷(期)：2024.41(9)