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Studies on Photosynthesis and Moisture Physiological Characteristics of Larix Principis-rupprechtii in Saihanba Forest Farm

Author: HuHeMuRen
Tutor: ZhouMei；DiHongBo
School: Inner Mongolia Agricultural University
Course: Ecology
Keywords: North China larch Photosynthesis Leaf water potential Growing season
CLC: S791.22
Type: Master's thesis
Year: 2010
Downloads: 56
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Abstract


In this paper, Hebei Province forestfloor North China larch for the study, in 2009, from May to October, the LI-6400 portable photosynthesis system and the pressure chamber method for determination of different forest age in North China larch photosynthetic leaf water potential and its physiological and ecological factors, different in North China larch forest age photosynthesis, water physiological and ecological characteristics of the preliminary study, the net photosynthetic rate of the the forest age North China larch, the correlation between the transpiration rate and the physiological and ecological factors and stepwise regression equation; reveals each forest age in North China larch leaf water potential and water use efficiency in different months of water stress law and drought resistance, leaf water potential and atmospheric temperature, relative humidity, atmospheric and soil moisture relationship. The study results show that: 1. Throughout the growing season, three different forest age in North China larch under natural conditions, the net photosynthetic rate trend showed a single peak curve in many cases. Maximum net photosynthetic rate of the growing season in mid the average 5.943μmolCO 2 · m -2 s -1 (31a Health), 9.471μmolCO 2 · m -2 s -1 (15a Health) and 6.946μmol CO 2 · m -2 s -1 (6a of Health); early smallest of the growing season, the average of 2.743μmolCO 2 · m -2 s -1 (31a of Health), 2.755μmol CO 2 · m -2 s -1 (15a Health The) and 3.038μmolCO 2 · m -2 s -1 (6a students). 2 of the main factors affecting the different seasons in North China larch forest age diurnal change. Growing season early, stomatal conductance and intercellular CO 2 concentration diurnal variation of net photosynthetic rate of three different forest age in North China larch impact factor; growing season, mid-term, relative humidity, three different forest age North China larch diurnal changes most commonly affect factor; late growing season, effective solar radiation is a major impact factor 31a raw larch diurnal variation of net photosynthetic rate; stomatal conductance and intercellular CO 2 concentration 15a raw larch diurnal change impact factor; there is no significant correlation between the the 6a born in North China larch net photosynthetic rate of physiological and ecological factors. Growing season early, non-stomatal limiting factor is the main reason for the decrease of the net photosynthetic rate of the North China larch; growing season, mid-term and a final, of North Larch net photosynthetic rate reduced by stomatal and non-stomatal factors together. Growing season early, three different forest age in North China larch transpiration rate diurnal variation curve showed a bimodal curve; middle and the end of the growing season, the diurnal variation of transpiration rate of three different North China larch forest age showed a unimodal curve (except 31a of the growing season in mid-Health larch). 31a raw water use efficiency larch 5. Throughout the growing season, the highest (average 4.649μmolCO 2 . Mmol-1H2O), indicating that 31a Health larch can make better use of the same moisture conditions water resources, 31a Health larch or better drought resistance and growth suitability. Whole growing season early (5-6 months) and the growing season late (9,10) leaf water potential minimum value appears in about 12:00, the growing season, mid-term (7-8 months) in leaf water potential minimum value about 8:00; leaf water potential maximum value around 6:00 in the morning. Stepwise regression analysis showed that between leaf water potential and meteorological factors, month and different forest age, leaf water potential major impact factor; dawn leaf water potential and soil moisture changes are in good agreement dawn leaf The highest value of water potential and soil water content in July (except 31a of Health).

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CLC: > Agricultural Sciences > Forestry > Forest tree species > Coniferous > Larch
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