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[1]QIAO Yuning,REN Jingyu,WEI Sihan,et al.Photosynthetic Physiological and Ecological Characteristics of 5 Main Forest & Shrub Stands in Loess Hilly Region[J].Research of Soil and Water Conservation,2021,28(06):397-406.

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Photosynthetic Physiological and Ecological Characteristics of 5 Main Forest & Shrub Stands in Loess Hilly Region

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 06 Page number: 397-406 Column: Public date: 2021-10-10

Title:: Photosynthetic Physiological and Ecological Characteristics of 5 Main Forest & Shrub Stands in Loess Hilly Region

Author(s):: QIAO Yuning^1,2，REN Jingyu²，WEI Sihan³，CHEN Yunming^1,4，WU Rui³; (1.State key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau，Institute of Soil and Water Conservation，Northwest A&F University，Yangling，Shaanxi 712100，China; 2.Upper and Middle Yellow River Bureau，YRCC，MWR，Xi'an 710021，China; 3.College of Forestry，Northwest A&F University，Yangling，Shaanxi 712100，China; 4.Institute of Soil and Water Conservation，CAS & MWR，Yangling，Shaanxi 712100，China; 5.Water Conservancy Bureau of Hanbin，Ankang，Shaanxi 725000，China)

Keywords:: photosynthetic physiological parameter; daily variation curve; pearson correlative analysis; eco-physiological factors; loess hilly region

CLC:: S154.1

DOI:: -

Abstract:: In order to explain the change characteristics of photosynthetic physiological parameters of five tree and shrub species，LI-6400XT was used to measure photosynthetic physiological parameters，and data of soil moisture and meteorological factors were collected. The diurnal changes of photosynthetic physiological characteristics and differences in daily accumulation were obtained，and the differences were analyzed. The relationship between impact factors and photosynthetic physiological parameters were analyzed. The results showed that:(1)the daily changes of net photosynthetic rate(Pn)，transpiration rate(Tr)，stomatal conductance(Gs)and stomatal limit value(Ls)Forsythia suspensa and Amorpha fruticosa showed the patters of double peaks and single peaks，and the peaks concentrated at 10:00 and 14:00; the Pn of Platycladus orientalis and water use efficiency(WUE)showed a monotonous decreasing trend;(2)the difference in photosynthetic physiological parameters between different species showed that the daily accumulation of Pn，Tr，WUE and Gs of shrubs was higher than that of trees，among which the parameters of Amorpha fruticosa and Syzygium aromaticum were significantly better than those of other tree species; except for the large daily accumulation of intercellular CO₂ concentration(Ci)of Platycladus orientalis，the accumulation of other parameters was significantly lower than that of other tree species;(3)the correlation between Pn and Gs of each tree species was the highest and proportional，and Tr was inversely proportional to Ci，atmospheric CO₂ concentration(Ca)and air relative humidity(RH); shallow soil moisture(20，50 cm)showed a positive correlation with Pn and Tr of Platycladus orientalis，Forsythia suspensa，Syzygium aromaticum，deep soil moisture(120，150 cm)was closely related to photosynthesis and transpiration of Syzygium aromaticum and Amorpha fruticosa，among which Amorpha fruticosa presented an opposite change trend. The above results indicated that Amorpha fruticosa had the strongest environmental adaptability and was suitable for being main ecological restoration shrub species in the loess hilly region，while Pinus tabuliformis had higher water use efficiency and was suitable for being main drought-resistant tree species in this region.

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Last Update: 2021-10-10