Stable carbon isotope composition (啄 13 C value) was one of the effective methods for measuring the plant water use efficiency (WUE) ,and was already applied in many plants. At present, the study on estimation of the WUE of Cassia obtusifolia L.. by 啄 13 C was a few. In order to prove the reliability of 啄 13 C on measuring WUE for Cassia obtusifolia L., 啄 13 C、 stable carbon isotope discrimination (驻 13 C) 、WUE and the relationship among them are measured in different organs (root, steam, leaf) and different growth stages by pot experiment and 啄 13 C. The results showed that, the 啄 13 C value and 驻 13 C of roots were highest, the next were stems, leaves were minimum, there were significant level in the 啄 13 C value and 驻 13 C in roots in different growth stages, positive relationship were found between the 啄 13 C value and WUE in stems and leaves, negative relationship were found between the 驻 13 C and WUE in stems and leaves. It showed significant positive correlation level among WUE (Potted method) and WUE L 、WUE S 、WUE R (Carbon isotope method) , related coefficient were 0. 86、 0郾 82、0.80 respectively, those showed carbon isotope technology was reliable to determine the WUE of Cassia obtusifolia L..

Light quantity and quality strongly influence plant growth. Solar radiation is one of the main environmental factors driving vegetation carbon assimilation. As one of the natural climatic variables, clouds change the fraction of diffuse radiation arriving on the land surface and can influence carbon dioxide exchange between vegetation and the atmosphere. In this study, CO 2 flux was continuously measured during the vegetative growing season (June鄄August) from 2006 to 2008 by the eddy covariance systems in a mixed plantation in the Xiaolangdi area, Henan province. The clearness index (k t) was used to describe the effects of cloudiness on solar radiation. Clear mornings and afternoons were identified based on the change of k t with solar elevation (茁) at a half鄄day scale. The impacts of cloudiness on the net ecosystem exchange of carbon dioxide (NEE) were investigated to reveal the mechanism of changes in coordinate of solar radiation and other

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Energy balance in the terrestrial ecosystem plays an important role in regional climate and water balance. By using the open鄄path eddy covariance and micrometeorological observation systems, turbulent energy fluxes and available energy were measured in a mixed plantation in the Xiaolangdi area in the North China during the growing season of 2012 (May鄄September). The diurnal and monthly variations of energy balance terms were analyzed, and energy closure and Bowen ratio were discussed. The results showed that the diurnal variation of energy balance terms were similar to that of net radiation, and the variation order of energy balance terms was net radiation >latent heat flux >sensible heat flux >soil heat flux. The time of keeping positives for energy balance terms in a day became shorter from May to September as energy balance terms were influenced by sunshine hour. The maximal net radiation occurred in June with a value of 418.5 MJ m-2

Walnut (Juglans regia L.) is an important economic tree species in rocky mountain of North China, which plays a key role in adjusting agricultural structure and promoting farmers忆 economic income. As a kind of hygrophilous tree species, irrigation is the main measure for the walnut water management in the region located in semi鄄arid zone with limited water resource. So it is necessary to accurately evaluate water consumption of walnut trees during the growing seasons to enhance water use efficiency. The main purpose of this paper is to observe and analyze the individual walnut water consumption and its response to meteorological factors during the growing seasons. Sap flow of walnut trees was measured by thermal dissipation probe (TDP) method and meteorological factors, reference crop evapotranspiration were acquired by automatic weather station and local astronomy data. The study measured, analyzed diurnal and monthly sap flow characteristics of individual trees of Juglans regia L. and the relationship with meteorological factors, reference crop