Poplar (Populus spp.), seabuckthron (Hippophae rhamnoides), locust (Robinia pseudoacacia) and Chinese pine (Pinus tabulaeformis) are the important tree species in most areas of the Loess Plateau, which is subjected to water stress. To evaluate water use efficiency characteristics of the four tree species, the experiments were designed by monitoring changes of the physiological traits at three soil water conditions, such as favorable soil water condition, medium drought and serious drought,which hold about 7...
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