%0 Journal Article
%T Effects of N fertilization levels on ammonia volatilization from rice shoot at later growth stages.<br>施氮水平对水稻生育后期地上部氨挥发的影响
%A CHEN Gang
%A XU Yang-chun
%A SHEN Qi-rong
%A <br>陈刚
%A 徐阳春
%A 沈其荣
%J 应用生态学报
%D 2008
%I 
%X With simulated pot culture in greenhouse, the ammonia volatilization from rice shoot and its affecting factors after flowering was studied under different N fertilization levels. The results showed that the daily and total amount of volatilized ammonia increased with increasing N application rate, with a certain variance among different N levels observed. At flowering and maturing stages; the ammonia volatilization from rice shoot (y) had significant negative correlations with functional leaf GS activity (x1) and positive correlations with functional leaf apoplastic NH4+ concentration (x2), with y = -0.37846x1 + 0.41821x2 + 0.04925 (R2 = 0.9471, n = 16), and negative correlations with N harvest index (x1) and physiological N use efficiency (x2), following y = -0.02117x1 + 0.75186 (R2 = 0.842, n = 8) and y = -1.10386x2 + 35.52676 (R2 = 0.8489, n = 8), respectively. It was suggested that the increasing ammonia volatilization from rice shoot under high N fertilization level was correlated with the decrease of N use efficiency by rice.
%K 水稻
%K 地上部
%K 氨挥发
%K 氮肥利用率
%K 谷氨酰胺合成酶活性
%K 质外体NH4
%K 浓度
%K 不同施氮水平
%K 水稻氮素
%K 生育后期
%K 地上部
%K 氨挥发
%K 影响因素
%K growth
%K shoot
%K rice
%K ammonia
%K volatilization
%K levels
%K N
%K fertilization
%K 氮肥利用率
%K 生理
%K 收获指数
%K 负相关
%K 浓度
%K 活性
%K 合成酶
%K 谷氨酰胺
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=42FEDDFE54F8BCD9D5FD1926ABDD7722&aid=9CF8204052828354C589442FE7742221&yid=67289AFF6305E306&vid=2A8D03AD8076A2E3&iid=DF92D298D3FF1E6E&sid=6E73C7EB16CBAB68&eid=65B62960A2E224C9&journal_id=1001-9332&journal_name=应用生态学报&referenced_num=2&reference_num=25