广西植物
廣西植物
엄서식물
GUIHAIA
2014年
5期
629-634,718
,共7页
郭淑青%李文金%张仁懿%王刚
郭淑青%李文金%張仁懿%王剛
곽숙청%리문금%장인의%왕강
金露梅%氮含量%磷含量%氮磷比%比叶重%净光合速率%光合氮利用效率
金露梅%氮含量%燐含量%氮燐比%比葉重%淨光閤速率%光閤氮利用效率
금로매%담함량%린함량%담린비%비협중%정광합속솔%광합담이용효솔
Potentillafruiticosa%leaf nitrogen content%leaf phosphorus content%N∶P ratio%leaf mass per area%net photosynthetic rate%photosynthetic nitrogen use efficiency
通过三种养分添加处理,氮添加(5、10和15 g??m-2)、磷添加(梯度同氮添加)、氮磷同时添加[(5 g N＋5 g P)??m-2、(10 g N＋10 g P)??m-2、(15 g N＋15 g P)??m-2],对照(无养分添加),探讨养分添加对金露梅叶片性状氮含量(Nmas )、磷含量(Pmas )、氮磷比(N∶P)、比叶重(LMA)、净光合速率(Pn )和光合氮利用效率(PNUE)的影响,以及各性状之间的相互关系.结果表明：在处理水平上,除N或P显著提高金露梅叶片的N∶P外,氮、磷添加对叶片其它性状无显著影响；不同氮、磷处理下添加水平对金露梅叶片的Nmas、N∶P、Pn和PNUE均有显著影响,随着养分水平提高,各性状的变化模式各不相同,叶片Pmas无明显变化,而叶片LMA虽有降低的趋势但不显著.回归分析表明,叶片Pmas与Nmas之间呈显著正相关(R2＝0．347,P＜0．001),叶片Nmas 与N∶P之间也呈显著正相关(R2＝0．018,P＜0．05),而叶片Pmas与N∶P呈显著负相关(R2＝0．505,P＜0．001)；叶片LMA与Pn之间显著负相关(R2＝0．02,P＜0．05),而与PNUE之间显著正相关(R2＝0．077,P＜0．001).这表明在一定范围内,环境变化可以改变金露梅叶片的养分保持能力、光合能力以及养分利用效率.
通過三種養分添加處理,氮添加(5、10和15 g??m-2)、燐添加(梯度同氮添加)、氮燐同時添加[(5 g N＋5 g P)??m-2、(10 g N＋10 g P)??m-2、(15 g N＋15 g P)??m-2],對照(無養分添加),探討養分添加對金露梅葉片性狀氮含量(Nmas )、燐含量(Pmas )、氮燐比(N∶P)、比葉重(LMA)、淨光閤速率(Pn )和光閤氮利用效率(PNUE)的影響,以及各性狀之間的相互關繫.結果錶明：在處理水平上,除N或P顯著提高金露梅葉片的N∶P外,氮、燐添加對葉片其它性狀無顯著影響；不同氮、燐處理下添加水平對金露梅葉片的Nmas、N∶P、Pn和PNUE均有顯著影響,隨著養分水平提高,各性狀的變化模式各不相同,葉片Pmas無明顯變化,而葉片LMA雖有降低的趨勢但不顯著.迴歸分析錶明,葉片Pmas與Nmas之間呈顯著正相關(R2＝0．347,P＜0．001),葉片Nmas 與N∶P之間也呈顯著正相關(R2＝0．018,P＜0．05),而葉片Pmas與N∶P呈顯著負相關(R2＝0．505,P＜0．001)；葉片LMA與Pn之間顯著負相關(R2＝0．02,P＜0．05),而與PNUE之間顯著正相關(R2＝0．077,P＜0．001).這錶明在一定範圍內,環境變化可以改變金露梅葉片的養分保持能力、光閤能力以及養分利用效率.
통과삼충양분첨가처리,담첨가(5、10화15 g??m-2)、린첨가(제도동담첨가)、담린동시첨가[(5 g N＋5 g P)??m-2、(10 g N＋10 g P)??m-2、(15 g N＋15 g P)??m-2],대조(무양분첨가),탐토양분첨가대금로매협편성상담함량(Nmas )、린함량(Pmas )、담린비(N∶P)、비협중(LMA)、정광합속솔(Pn )화광합담이용효솔(PNUE)적영향,이급각성상지간적상호관계.결과표명：재처리수평상,제N혹P현저제고금로매협편적N∶P외,담、린첨가대협편기타성상무현저영향；불동담、린처리하첨가수평대금로매협편적Nmas、N∶P、Pn화PNUE균유현저영향,수착양분수평제고,각성상적변화모식각불상동,협편Pmas무명현변화,이협편LMA수유강저적추세단불현저.회귀분석표명,협편Pmas여Nmas지간정현저정상관(R2＝0．347,P＜0．001),협편Nmas 여N∶P지간야정현저정상관(R2＝0．018,P＜0．05),이협편Pmas여N∶P정현저부상관(R2＝0．505,P＜0．001)；협편LMA여Pn지간현저부상관(R2＝0．02,P＜0．05),이여PNUE지간현저정상관(R2＝0．077,P＜0．001).저표명재일정범위내,배경변화가이개변금로매협편적양분보지능력、광합능력이급양분이용효솔.
In a global context,increasing of nitrogen and phosphorus are affecting the ecosystem biogeochemical cy-cles,which may have an impact on nutrient retention properties of plants.We studied the potential effects of nutrients additions on foliar nutrient and photosynthetic traits of Potentillafruiticosa in a sub-alpine meadow,and the relation-ships between these leaf traits.The treatments involved additions of 5,10 and 15 g·m-2 nitrogen(N),phosphorus (P)alone and combined,respectively,and a control (no nutrient added).The results showed,at the treatment level, N or P addition alone increased N∶P ratio (N∶P)significantly of P.fruiticosa,but nutrients addition treatments had no significant effect on foliar nitrogen content (Nmas ),phosphorus content (Pmas ),leaf mass per area (LMA),net photosynthetic rate (Pn)and photosynthetic nitrogen use efficiency (PNUE).Nutrient levels had significant effect on foliar Nmas, N∶P, Pn and PNUE in each treatment,except Pmas and LMA in P addition alone,and there was a decrea-sing but insignificant trend of LMA with increasing nutrients levels.Across the study,the Nmas was positively correla-ted with the Pmas (R2=0.347,P<0.001)and the N∶P(R2=0.018,P<0.05),while the Pmas was significantly nega-tively correlated with the N∶P(R2=0.505,P<0.001).The LMA had a significantly negative relationship with the Pn(R2=0.02,P<0.05),but a significantly positively one with the PNUE(R2=0. 077, P<0. 001). In general,these results suggested moderate environmental change would change nutrient retention,photosynthetic capacity and nutri-tional use strategy of P.fruiticosa.
