%0 Journal Article
%T Effects of N addition on nutrient resorption efficiency and C:N:P stoichiometric characteristics in Stipa bungeana of steppe grasslands in the Loess Plateau,China<br>氮素添加对黄土高原典型草原长芒草氮磷重吸收率及C:N:P化学计量特征的影响
%A AN Zhuo
%A NIU De-Cao
%A WEN Hai-Yan
%A YANG Yi
%A ZHANG Hong-Rong
%A and FU Hua
%A <br>安卓
%A 牛得草
%A 文海燕
%A 杨益
%A 张洪荣
%A 傅华
%J 植物生态学报
%D 2011
%I Editorial Office of Chinese Journal of Plant Ecology
%X Aims Our purpose was to study the effects of deposition of nitrogen (N) on plant carbon (C), N, phosphorus (P), N and P nutrient resorption efficiencies, C : N : P stoichiometry and their internal relations on Stipa bungeana of Loess Plateau natural grassland. Methods Deposition of N was simulated by N fertilization at four levels. Changes of C, N and P contents were detected, and C : N : P and the N and P nutrient resorption efficiencies were estimated for S. bungeana. Important findings The C and N contents of leaves and N and P contents of standing litter increased significantly with N addition. However, the P content of leaves and C content of standing litter did not response to N addition. The N and P resorption efficiencies of S. bungeana decreased significantly with N addition. When there was no N addition, N and P resorption efficiencies were highest (60.35% and 71.75%, respectively). Meanwhile, the P resorption efficiency was greater than that of N in same treatment. The C : N of S. bungeana decreased gradually with N addition, but the N : P and C : P increased with N addition. Values of the N : P were 18.25–29.01. The results showed the Loess Plateau natural grassland was mainly limited by P, and the strength of P limitation was enhanced with N deposition. Higher N and P resorption efficiencies were an important strategy for S. bungeana to survive soil infertility.
%K ecological stoichiometry
%K Loess Plateau
%K nitrogen addition
%K nutrient limitation
%K nutrient resorption efficiency<br>生态化学计量学
%K 黄土高原
%K 氮素添加
%K 养分限制
%K 养分重吸收率
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=2F2173CCFF292BF447DC2681EA33BBAE&aid=9345C3E296A5F6AF08BE1419255AB7A6&yid=9377ED8094509821&vid=6209D9E8050195F5&iid=5D311CA918CA9A03&sid=0018E43E61963A72&eid=4FBF7A066D63EF1A&journal_id=1005-264X&journal_name=植物生态学报&referenced_num=0&reference_num=38