Phenology characteristics of ulmus pumila and its simulation from 1981 to 2005 in Northeast China
li rong-ping1; 2; 3 zhou guang-sheng1; 3 guo chun-ming4 sun shou-jun5(1.key laboratory of vegetation and environmental change; institute of botany; the chinese academy of sciences; beijing 100093; china; 2.graduate school of chinese academy of sciences; beijing 100039; china; 3.institute of atmospheric environment; china meteorological administration; shenyang 110016; china; 4.jilin institute of meteorological sciences; changchun 130061; china; 5.heilongjiang institute of meteorological sciences; harrbin 150030; china)
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