کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4553991 | 1628043 | 2017 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Nitrogen enrichment alters plant N: P stoichiometry and intensifies phosphorus limitation in a steppe ecosystem
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Nitrogen enrichment alters plant N: P stoichiometry and intensifies phosphorus limitation in a steppe ecosystem Nitrogen enrichment alters plant N: P stoichiometry and intensifies phosphorus limitation in a steppe ecosystem](/preview/png/4553991.png)
چکیده انگلیسی
Although many studies have demonstrated that N deposition decreases biodiversity and alters ecosystem functioning, fewer studies have tested how N enrichment affect plant N and P limitation, N: P stoichiometry and ecosystem functioning. We examined the independent and interactive effects of N and P enrichment on plant N: P stoichiometry, nutrient limitation, and thereby ecosystem functioning based on two N, P, and NÂ +Â P addition experiments in a typical steppe. At the species level, N enrichment increased leaf N: P ratio and P limitation of dominant species. The responses of plant tissue N: P ratio tend to saturate at soil available N: P supply ratio of approximately 20 for leaf N: P and 10 for root N: P ratio. At the community level, patterns of N and P limitation shifted from N limitation in a normal year to N and P co-limitation in a wet year, triggered mainly by inter-annual changes in soil N and P availability. The homoeostasis of N: P stoichiometry increases from plant leaves to roots and to microbes although the available N: P supply ratio varied by 56-fold in soil. Given that N deposition rates are projected to increase in upcoming decades, N deposition may further alter the stoichiometric balance of N and P and intensify P limitation of steppe ecosystems in future.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Environmental and Experimental Botany - Volume 134, February 2017, Pages 21-32
Journal: Environmental and Experimental Botany - Volume 134, February 2017, Pages 21-32
نویسندگان
Shuxia Zhan, Yang Wang, Zhicheng Zhu, Wenhuai Li, Yongfei Bai,