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青藏高原高寒灌丛草甸和草原化草甸CO2通量动态及其限制因子
柴曦1,3,李英年2,段呈1,3,张涛4,宗宁1,石培礼1,3,*(),何永涛1,3,张宪洲1,3
CO2 flux dynamics and its limiting factors in the alpine shrub-meadow and steppe-meadow on the Qinghai-Xizang Plateau
CHAI Xi1,3,LI Ying-Nian2,DUAN Cheng1,3,ZHANG Tao4,ZONG Ning1,SHI Pei-Li1,3,*(),HE Yong-Tao1,3,ZHANG Xian-Zhou1,3

图3. 2004-2008年高寒灌丛草甸和草原化草甸月平均光合有效辐射(A, PAR, μmol·m-2·s-1)、月平均空气温度(B, Ta, ℃)、月平均 5 cm土壤温度(C, Ts, ℃)、月平均饱和水汽压差(D, VPD, kPa)、 月平均5 cm土壤含水量(E, SWC, m3·m-3)、 月降水量(E, PPT, mm)和归一化植被指数(F, NDVI)16天平均值的季节动态。黑色点线和黑色柱形图代表灌丛草甸, 灰色点线和灰色柱形图代表草原化草甸。

Fig. 3. Seasonal dynamic of monthly average photosynthetically active radiation (A, PAR, μmol·m-2·s-1), monthly average air temperature (B, Ta, ℃), monthly average soil temperature at a depth of 5 cm (C, Ts, ℃), monthly average vapor press deficit (D, VPD, kPa), monthly average soil water content at a depth of 5 cm (E, SWC, m3·m-3), and monthly total precipitation (E, PPT, mm), 16-day mean normalized difference vegetation index (F, NDVI) in the alpine shrub-meadow and steppe-meadow form 2004 to 2008. The black squares and histograms represent the shrub-meadow and the grey circles and histograms denote the steppe-meadow.