%0 Journal Article
%T Effects of simulated nitrogen deposition on competition of weedy species ( Echinochloa crusgalli var. mitis L.) and upland rice (Oryza sativa L.) under different air temperatures<br>两种温度下模拟氮沉降对陆稻与稗草竞争的影响
%A HU Shuijin
%A YANG Xian-yan
%A JIANG Qi-qing
%A TANG Jian-jun
%A CHEN Xin
%A HU Shuijin
%A <br>杨贤燕
%A 蒋琦清
%A 唐建军
%A 陈欣
%A Hu Shuijin
%J 应用生态学报
%D 2007
%I 
%X A greenhouse experiment was conducted to study the effects of simulated nitrogen deposition on the growth and competition of C4 weedy species (Echinochloa crusgalli var. mitis L. ) and C3 upland rice (Oryza sativa L.) under day/night temperature of 35 degrees C/25 degrees C and 30 degrees C/20 degrees C. The results showed that under day/night temperature 35 degrees C/25 degrees C, 4.0 g x m(-2) x a(-1) N deposition enhanced the shoot biomass of E. crusgalli and O. sativa by 29.18% and 27.80%, respectively, compared with control. The N and P uptake by E. crusgalli increased by 87.33% and 49.73%, respectively, but no change was found for O. sativa. Under 30 degrees C/20 degrees C, three N depositions (2, 4 and 6 g x m(-1) x a(-1) ) enhanced the shoot biomass, tiller number, and shoot N and P uptake of E. crusgalli by 48.99%, 72.68% and 36.18%, 111.11%, 122.22% and 144.44%, 108.88%, 129.22% and 134.29%, and 16.53%, 65.05% and 22.47%, respectively, but no changes were observed for O. sativa. Nitrogen deposition significantly increased the shoot biomass ratio of E. crusgalli to O. sativa under 30 degrees C/20 degrees C, but had no impact on this ratio under 35 degrees C/25 degrees C. It was suggested that N deposition could enhance the competition of E. crusgalli over O. sativa, especially under lower air temperature.
%K simulated nitrogen deposition
%K Oryza sativa L
%K Echinochloa crusgalli var
%K mitis L
%K competition<br>模拟氮沉降
%K 陆稻
%K 稗草
%K 竞争
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=42FEDDFE54F8BCD9D5FD1926ABDD7722&aid=98B813FB22376FDF&yid=A732AF04DDA03BB3&vid=13553B2D12F347E8&iid=E158A972A605785F&sid=51E4ADE955550A0C&eid=7CD511FB1661A334&journal_id=1001-9332&journal_name=应用生态学报&referenced_num=0&reference_num=26